Pipe trench well point precision dewatering method and system based on PID control

Abstract

This invention discloses a method and system for precise dewatering of pipeline trenches using PID control, belonging to the field of dewatering regulation technology. The method specifically includes: dividing the trench into multiple independent dewatering control zones; establishing a trench-soil-wellpoint coupling mapping relationship; generating target drawdown curves and allowable fluctuation thresholds for each dewatering control zone; collecting water system parameters within each dewatering control zone; comparing the water system parameters with the corresponding target drawdown curves to obtain the water level deviation, deviation change rate, and spatial gradient deviation of each dewatering control zone; constructing a comprehensive deviation signal; performing PID calculations on each dewatering control zone based on the comprehensive deviation signal to generate corresponding regulation commands for the dewatering control zone; and performing precise dewatering of pipeline trench wellpoints based on the regulation commands. This application improves the coordination and continuity of the dewatering process and enhances the adaptability to groundwater changes under complex geological conditions.

Description

Technical Field

[0001] This invention belongs to the field of precipitation control technology, specifically a method and system for precise precipitation control in pipeline trenches and wellpoints based on PID control. Background Technology

[0002] During pipeline construction and underground pipeline laying, pipeline trenches are typically located in areas significantly affected by groundwater, especially under conditions of high groundwater levels or highly permeable soil layers. Seepage, water accumulation, and even localized water surges are highly likely to occur during trench excavation. To ensure the stability of the trench structure and the continuity of construction, wellpoint dewatering is commonly used in engineering projects. This involves laying wellpoint pipes around the trench and continuously pumping groundwater to lower the groundwater level.

[0003] As trench construction length increases and construction progresses in segments, groundwater responses in different sections exhibit significant spatiotemporal differences, with hydraulic coupling and mutual influence existing between adjacent sections. Current technologies primarily employ single-point or overall water level monitoring to regulate precipitation processes, lacking comprehensive analytical methods for analyzing regional water level change trends, temporal evolution, and spatial differences. This results in control processes often lagging behind actual water level changes, leading to unstable water level fluctuations, discontinuous control responses, and difficulties in achieving precise regulation. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention proposes a method and system for precise dewatering of pipeline trenches using PID control. During the dewatering process of pipeline trenches using wellpoints, a control method is constructed that takes into account regional differences, temporal evolution, and spatial correlation, thereby achieving regionalized, sequential, and coordinated regulation of the dewatering process.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A precise dewatering method for pipeline trenches based on PID control includes: Based on the relevant parameters of the pipeline trench, the trench is divided into multiple independent dewatering control zones. A coupled mapping relationship between the trench, soil layer, and well point is established, and the target water level drawdown curve and allowable fluctuation threshold corresponding to each dewatering control zone are generated. The relevant parameters of the pipeline trench include the horizontal orientation of the pipeline trench, excavation depth, soil permeability coefficient, initial groundwater depth, well point pipe layout parameters, and construction progress. Water system parameters are collected in each precipitation control zone. The water system parameters are compared with the corresponding target water level drawdown curves to obtain the water level deviation, deviation change rate and spatial gradient deviation of each precipitation control zone. A comprehensive deviation signal is constructed. The comprehensive deviation signal represents the risk of local inrush and excessive drawdown. The water system parameters include groundwater level, pore water pressure, well point vacuum, instantaneous outflow rate and trench slope displacement data. Based on the comprehensive deviation signal, PID calculations are performed on each precipitation control zone to generate corresponding control commands for the precipitation control zone. These control commands are applied to the well point main pipe negative pressure adjustment unit, the branch pipeline electric valve unit, and the pumping pump frequency conversion drive unit, respectively, to synchronously adjust the pumping negative pressure, branch opening, and pumping rate of each zone, thereby controlling the groundwater level of each precipitation control zone to converge according to the corresponding target water level drawdown curve. Precise dewatering is carried out at the well points in the pipeline trench based on the aforementioned control commands.

[0006] Specifically, the process involves dividing the trench into multiple independent dewatering control zones based on relevant parameters, establishing a trench-soil-wellpoint coupling mapping relationship, and generating target drawdown curves and allowable fluctuation thresholds for each dewatering control zone, including: The planar orientation, excavation depth, soil permeability coefficient, initial groundwater depth, wellpoint pipe layout parameters, and construction progress of the pipeline trench are obtained. The trench axis is then discretized along the planar orientation according to a preset length to form a basic segment sequence consistent with the construction progress direction. Identify the points of excavation depth change, soil layer boundary, groundwater depth inflection point, well point pipe layout change, and construction progress switching point in each foundation segment. Project the change points onto the trench axis and divide and correct the foundation segment column to form the initial control sub-segment. The soil permeability continuity, groundwater recharge trend, well point drainage coverage and construction sequence connection of adjacent initial control sub-segments are compared segment by segment. When adjacent initial control sub-segments meet the preset association conditions, they are merged. When they do not meet the preset association conditions, the boundary is retained, and multiple independent precipitation control zones are formed along the trench. The trench excavation outline, soil layer distribution, groundwater occurrence section and well point action range of each independent precipitation control zone are sequentially associated to establish a section-level coupling mapping relationship, and the well point action ranges that overlap across zones are marked with a switching attribute. Based on the segment-level coupling mapping relationship and the construction progress of the corresponding independent precipitation control zones, target water level drawdown curves are generated for each independent precipitation control zone, and corresponding allowable fluctuation thresholds are configured according to different construction periods within the zone and the boundary connection order of adjacent zones.

[0007] Specifically, based on the segment-level coupling mapping relationship and the construction progress of the corresponding independent precipitation control zones, target water level drawdown curves are generated for each independent precipitation control zone, and corresponding allowable fluctuation thresholds are configured according to different construction periods within the zone and the boundary connection order of adjacent zones, including: Based on the construction progress of each independent precipitation control zone and its position order in the section-level coupling mapping, the precipitation process of the independent precipitation control zone is divided into a preparatory period, an accompanying excavation period, and a connection period, and the starting and ending boundary segments of each period are determined respectively. Based on the arrangement of each independent precipitation control zone on the gully axis, the starting and ending boundary segments of adjacent independent precipitation control zones are sequentially associated to form a zone boundary transition relationship, and the upstream receiving segment, main execution segment, and downstream transition segment of the current independent precipitation control zone are determined accordingly. According to the arrangement of the construction periods, and in combination with the upstream receiving section, the main execution section and the downstream transition section, the target water level drawdown sections of the independent precipitation control zone are arranged in sequence, and the target water level drawdown sections are connected in sequence to form the corresponding target water level drawdown curve. Based on the arrangement of each target water level drawdown segment in the target water level drawdown curve, a corresponding allowable fluctuation threshold is configured for each independent precipitation control zone. Specifically, the allowable fluctuation threshold for the time period is configured according to the construction period, and the allowable fluctuation threshold for the boundary is configured according to the boundary transition relationship of the zone.

[0008] Specifically, the process involves collecting water system parameters within each precipitation control zone, comparing these parameters with the corresponding target water level drawdown curves to obtain the water level deviation, deviation change rate, and spatial gradient deviation for each precipitation control zone, and constructing a comprehensive deviation signal, including: Using each independent precipitation control zone as a data acquisition unit, groundwater level change information, well point pumping process information, and environmental information related to water body activity are acquired in each precipitation control zone, and a water system parameter sequence for the corresponding precipitation control zone is formed according to the acquisition time sequence. The water system parameter sequences of each precipitation control zone are sorted according to time order, and the sorted water system parameter sequences are mapped segment by segment to the corresponding time period position of the target water level drawdown curve according to the target water level drawdown curve of the corresponding precipitation control zone to form the actual water level trajectory sequence. The actual water level trajectory sequence is compared segment by segment with the corresponding position of the target water level drawdown curve to determine the water level deviation of each precipitation control zone in the corresponding time period, and the deviation sequence of each zone is recorded in chronological order. The partition deviation sequence is correlated with each segment according to the continuous acquisition time sequence to determine the deviation change relationship between adjacent time periods. At the same acquisition time, the deviation sequences of adjacent precipitation control zones are compared horizontally to determine the spatial gradient deviation at the corresponding location. The water level deviation, deviation change relationship, and spatial gradient deviation corresponding to each precipitation control zone are correlated and integrated according to a preset combination order to form a comprehensive deviation signal.

[0009] Specifically, the zoning deviation sequences are correlated between segments according to the continuous acquisition time sequence to determine the deviation change relationship between adjacent time periods. Furthermore, at the same acquisition time, the deviation sequences of adjacent precipitation control zones are compared laterally to determine the spatial gradient deviation at corresponding locations, including: According to the continuous acquisition time sequence of each precipitation control zone, the corresponding zone deviation sequence is sequentially divided to form multiple time sequence deviation segments with the beginning and end connected, and the preceding and following times are marked for each time sequence deviation segment. Using the preceding and following times of each time series deviation segment as connection nodes, adjacent time series deviation segments within the same precipitation control zone are sequentially linked to determine the deviation change relationship between adjacent time periods and form a time series change chain for the corresponding precipitation control zone. The positions of the zoning deviation sequences of adjacent precipitation control zones are aligned according to the direction of the ditch axis. The deviation values ​​of the corresponding sections at the boundaries of adjacent zones are arranged side by side to form a lateral comparison sequence at the same moment. The same-time lateral comparison sequence is compared group by group to determine the spatial gradient deviation between adjacent precipitation control zones at corresponding locations.

[0010] Specifically, the step of associating and integrating the water level deviations, deviation change relationships, and spatial gradient deviations corresponding to each precipitation control zone according to a preset combination order to form a comprehensive deviation signal includes: According to the precipitation control zones, the corresponding water level deviations, deviation change relationships, and spatial gradient deviations are collected separately. The deviation elements belonging to the same precipitation control zone are aligned in time to form a zone deviation element group. For each precipitation control zone, the water level deviation, deviation change relationship and spatial gradient deviation in the zone deviation element group are arranged in a preset combination order to form a corresponding zone combination sequence. Based on the partition combination sequence, the partition combination sequence corresponding to each acquisition time is sequentially passed along the continuous acquisition time sequence to form the deviation integration sequence of the corresponding precipitation control partition. The deviation integration sequence is encapsulated and labeled according to the precipitation control zone, so that each precipitation control zone forms a unique integrated deviation signal at each acquisition time.

[0011] Specifically, based on the comprehensive deviation signal, PID calculations are performed on each precipitation control zone to generate corresponding control instructions for that precipitation control zone, including: The comprehensive deviation signals corresponding to the precipitation control zones are received separately, and the comprehensive deviation signals of each precipitation control zone are read sequentially according to the continuous acquisition time sequence to form a zone control input sequence that corresponds one-to-one with each precipitation control zone. Based on the partition control input sequence of each precipitation control zone, the control segment is divided according to the current state, the time sequence succession state and the boundary association state to form the corresponding current control segment, succession control segment and boundary control segment; Using the current control segment, successor control segment, and boundary control segment of each precipitation control zone as input, PID calculations are performed on the precipitation control zone respectively, and the calculation results corresponding to each control segment are merged according to the time sequence position of the precipitation control zone to form the zone control quantity of the precipitation control zone. Based on the control quantities of each precipitation control zone, the control quantities of each zone are sequentially arranged according to the order of the zones along the gully axis, forming a draft sequence of control instructions corresponding to each precipitation control zone. The control instruction draft sequence is time-series addressed and zone-marked according to the precipitation control zone to generate control instructions for the corresponding precipitation control zone.

[0012] Specifically, based on the zoning control quantities of each precipitation control zone, the zoning control quantities are sequentially arranged according to the zoning order along the gully axis to form a draft sequence of control instructions corresponding to each precipitation control zone, including: Extract the corresponding zone control quantities according to the precipitation control zones, and bind each zone control quantity with the position of the corresponding precipitation control zone in the direction of the trench axis to form a one-to-one zone control unit. Based on the position of each zone control unit, the zone control units are arranged sequentially along the trench axis to form a control arrangement sequence consistent with the trench advancement direction. The adjacent partition control units in the control arrangement sequence are handed over to each other. The control content of the last segment of the preceding partition control unit is sequentially connected with the control content of the first segment of the following partition control unit according to the adjacent boundary position to form a continuous handover control sequence. According to the arrangement position, boundary sequence and precipitation control zone of each partition control unit in the relay control sequence, the control quantity of each partition is written into the corresponding instruction bit segment in sequence to form the control instruction draft sequence corresponding to each precipitation control zone.

[0013] Specifically, the draft sequence of control instructions is time-series addressed and zone-marked according to precipitation control zones to generate control instructions for the corresponding precipitation control zones, including: The control instruction sequence is segmented and extracted according to the precipitation control zone, and consecutive instruction segments belonging to the same precipitation control zone are merged to form the corresponding zone instruction segment. Based on the sequential position of each partition's draft instruction segment in the continuous control timing sequence, a corresponding timing address is configured for each partition's draft instruction segment, and the timing addresses are arranged sequentially according to the acquisition time, control round, and boundary handover order. Each zoning command segment is associated and bound with the corresponding precipitation control zone's zone identifier, axis position identifier, and boundary segment identifier to form a zoning command segment to be issued with a time sequence address and zone marker. According to the order of the time-series addresses, the instruction segments to be sent in each partition are encapsulated and output sequentially to generate the control instructions corresponding to each precipitation control partition.

[0014] A PID-controlled pipeline trench wellpoint precision dewatering system is used to implement the PID-controlled pipeline trench wellpoint precision dewatering method, including: a curve generation module, a deviation signal construction module, a control command generation module, and a dewatering control module. The curve generation module is used to divide the trench into multiple independent dewatering control zones according to the relevant parameters of the pipeline trench, establish a trench-soil-wellpoint coupling mapping relationship, and generate the target water level drawdown curve and allowable fluctuation threshold corresponding to each dewatering control zone. The relevant parameters of the pipeline trench include the planar orientation of the pipeline trench, excavation depth, soil permeability coefficient, initial groundwater depth, wellpoint pipe layout parameters, and construction progress. The deviation signal construction module is used to collect water system parameters in each precipitation control zone, compare the water system parameters with the corresponding target water level drawdown curve, obtain the water level deviation, deviation change rate and spatial gradient deviation of each precipitation control zone, and construct a comprehensive deviation signal. The comprehensive deviation signal characterizes the risk of local inrush and excessive drawdown. The water system parameters include groundwater level, pore water pressure, well point vacuum, instantaneous outflow rate and trench slope displacement data. The control command generation module performs PID calculations on each precipitation control zone based on the comprehensive deviation signal to generate control commands for the corresponding precipitation control zone. The control commands are applied to the well point main pipe negative pressure adjustment unit, the branch pipeline electric valve unit, and the pumping pump frequency conversion drive unit to synchronously adjust the pumping negative pressure, branch opening degree, and pumping rate of each zone, thereby controlling the groundwater level of each precipitation control zone to converge according to the corresponding target water level drawdown curve. The precipitation control module performs precise precipitation control on the well points in the pipeline trench based on the control commands.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention proposes a precise dewatering method and system for pipeline trenches based on PID control. Based on the target drawdown curves for each zone, the system performs time-series data acquisition and spatial correlation analysis of the water system parameters for each zone, generating a comprehensive deviation signal that includes water level deviation, deviation variation relationships, and spatial gradient deviation. Furthermore, it generates control commands through zoned PID calculations and axis sequence arrangement, achieving zoned, sequential, and coordinated control of each dewatering control zone. This allows for consideration of the differences and mutual influences between different sections during trench dewatering, ensuring consistency between dewatering control and construction progress, reducing the fragmentation of control between zones, improving the coordination and continuity of the dewatering process, and enhancing adaptability to groundwater changes under complex geological conditions. Attached Figure Description

[0016] Figure 1 A flowchart of the precise dewatering method for pipeline trenches based on PID control provided by the present invention; Figure 2 This is a schematic diagram of the binding of the partition control unit provided by the present invention; Figure 3 This is a schematic diagram illustrating the implementation of precision precipitation provided by the present invention; Figure 4 This invention provides an architecture diagram of a precision dewatering system based on PID control for pipeline trenches and wellpoints. Detailed Implementation

[0017] The present application will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any way. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application. These all fall within the protection scope of the present application.

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0019] It should be noted that, unless there is a conflict, the various features in the embodiments of this application can be combined with each other, all of which are within the protection scope of this application. Furthermore, although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than the module division in the device or the order in the flowchart. In addition, the terms "first," "second," and "third" used in this application do not limit the data or execution order, but only distinguish identical or similar items with essentially the same function and effect.

[0020] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0021] Example 1 The preset parameters or rules in this specification, including but not limited to preset length, preset threshold, preset association conditions and preset combination order, can be determined according to engineering design requirements, geological survey data, historical construction experience or field test results, and can be adjusted according to real-time monitoring data during construction. Those skilled in the art can select appropriate values ​​according to specific engineering conditions.

[0022] Please see Figures 1-3 The present invention provides an embodiment of a precise dewatering method for pipeline trenches based on PID control, comprising the following specific steps: Step S1: Divide the trench into multiple independent dewatering control zones according to the relevant parameters of the pipeline trench, establish a trench-soil-wellpoint coupling mapping relationship, and generate the target water level drawdown curve and allowable fluctuation threshold for each dewatering control zone. The relevant parameters of the pipeline trench include the horizontal orientation of the pipeline trench, excavation depth, soil permeability coefficient, initial groundwater depth, wellpoint pipe layout parameters, and construction progress.

[0023] like Figure 2 As shown, the specific steps of step S1 are as follows: Step S101: Obtain the planar orientation, excavation depth, soil permeability coefficient, initial groundwater depth, wellpoint pipe layout parameters, and construction progress of the pipeline trench. Then, along the planar orientation, the trench axis is discretized into segments according to a preset length to form a basic segment sequence consistent with the construction progress direction.

[0024] In this embodiment, the planar orientation information of the pipeline trench is extracted based on the construction design data and transformed into a continuous axis description along the construction progress direction. Then, combined with the excavation depth variation and the coverage of the wellpoint pipe layout, the axis is discretized at a unified scale. Specifically, the trench axis is segmented segment by segment using a preset length as the basic dividing unit, so that each segment corresponds to a relatively consistent spatial location interval. On this basis, each discrete segment is matched with the soil permeability coefficient, initial groundwater depth, and wellpoint pipe layout parameters of the corresponding section, so that each discrete segment has complete hydrogeological and precipitation information. Furthermore, the construction progress is projected onto the discrete axis, so that each discrete segment obtains a corresponding construction stage identifier in the time dimension, thereby forming a basic segment structure that simultaneously possesses spatial continuity and construction sequence attributes.

[0025] It should be noted that the preset length is determined based on the length of the trench construction sections, the spacing of the well points, and the scale of soil layer changes. The preferred length range is one that is equivalent to the radius of influence of the well points or the construction progress step distance, so as to ensure that the hydrological conditions are basically consistent in each section.

[0026] Step S102: Identify the excavation depth change points, soil layer boundary points, groundwater depth inflection points, well point pipe layout change points, and construction progress switching points within each foundation segment. Project the change points onto the trench axis and divide and correct the foundation segment column to form the initial control sub-segment.

[0027] In this embodiment, excavation design data, geological profile data, and construction organization information are introduced segment by segment onto the existing foundation sections. The consistency of the internal state of each foundation section is assessed. Specifically, firstly, the boundaries of intervals where the excavation depth changes abruptly or continuously along the trench axis are located within each foundation section, and these boundaries are marked as depth change points. Then, based on the soil layer distribution profile, the locations of different soil layer boundaries are mapped to the axis coordinates to form soil layer boundary points. Simultaneously, combined with the trend of groundwater depth changes along the line, the locations where the groundwater level changes from a gradual change to a steep change or from a monotonic change to a reverse change are identified as groundwater depth inflection points. Based on the locations where the wellpoint spacing, arrangement, or drainage coverage area is adjusted in the wellpoint layout diagram, the points of change in wellpoint layout are determined. Combined with the nodes of construction section switching, process conversion, or construction rhythm change in the construction schedule, the construction progress switching points are determined. Subsequently, all the above-mentioned change points are uniformly mapped to the same coordinate system of the trench axis, and the original foundation section is re-divided according to their order on the axis. This ensures that each segment remains relatively consistent in terms of excavation depth, soil properties, groundwater status, wellpoint action conditions, and construction rhythm, thereby obtaining an initial control sub-segment with a single control characteristic.

[0028] Step S103: Compare the soil permeability continuity, groundwater recharge trend, well point drainage coverage and construction sequence connection of adjacent initial control sub-segments segment by segment. When adjacent initial control sub-segments meet the preset association conditions, they are merged. When they do not meet the preset association conditions, the boundary is retained, and multiple independent precipitation control zones are formed along the trench.

[0029] In this embodiment, after obtaining the initial control segments, adjacent initial control segments are compared one by one according to the arrangement order of the trench axis. Specifically, firstly, the soil permeability characteristics corresponding to two adjacent initial control segments are extracted, and their continuity is judged under the same scale to determine whether they have a continuous relationship in the hydraulic conduction path. Then, combined with the trend of groundwater depth along the axis, the changes in groundwater recharge direction and recharge intensity between adjacent segments are compared to determine whether there is a continuity or abrupt change in the recharge path. Furthermore, the well point pipe layout parameters are mapped to each initial control segment, and the overlap relationship of the well point drainage coverage area of ​​adjacent segments is identified to determine the drainage range. The process involves determining whether there is continuous coverage or a discontinuous distribution; simultaneously, the correspondence between construction progress and the axis is incorporated into the comparison process to determine the tightness of connection between adjacent sub-segments in terms of construction sequence, in order to distinguish between continuous construction segments and segmented construction segments; based on the above multi-dimensional comparison results, according to the pre-set association judgment rules, adjacent initial control sub-segments that meet the requirements of continuous soil permeability, consistent groundwater recharge trend, continuous well point drainage coverage, and connection of construction sequence are merged; sub-segments that do not meet any of the above conditions retain their boundary positions unchanged. Through the segment-by-segment merging and retention operations along the trench axis, several relatively independent precipitation control zones in terms of hydrogeological conditions, well point range of action, and construction rhythm are finally formed.

[0030] It should be noted that the preset association conditions include at least one or more of the following: the difference in soil permeability coefficient between adjacent sections is within the allowable range, the groundwater recharge direction is consistent, the well point drainage coverage is continuous, and the construction sequence is adjacent.

[0031] Step S104: Sequentially associate the trench excavation outline, soil layer distribution, groundwater occurrence section and well point action interval of each independent precipitation control zone, establish a section-level coupling mapping relationship in the order of "trench section - soil layer unit - well point action unit", and mark the affiliation switch for the overlapping well point action intervals across zones.

[0032] In this embodiment, based on the already defined independent precipitation control zones, the excavation outline sections corresponding to each zone are first extracted along the trench axis and used as spatial positioning benchmarks. Then, based on geological survey data, the soil layer distribution within each section is unfolded layer by layer, forming several soil layer units with clear boundaries within each excavation outline section. Furthermore, groundwater occurrence information is combined to correlate groundwater locations with corresponding soil layer units segment by segment, clarifying the distribution location of water bodies in each layer. Based on this, the wellpoint pipe layout parameters are projected onto the trench axis and corresponding soil layer units according to their actual effective range, establishing a correspondence between the pumping influence range of each wellpoint pipe and the specific soil layer unit. Then, according to the "ditch..." The sequence of "trench section - soil layer unit - well point action unit" links the excavation section, corresponding soil layer unit, and well point action interval within the same zone hierarchically, so that each well point action unit can be traced back to its trench section and corresponding soil layer unit, thus forming a section-level coupled mapping structure. Furthermore, for well point action intervals that cross the boundary of adjacent precipitation control zones in the axial direction, their coverage range in different zones is identified, and their affiliation is determined according to the zone where their main action section is located. At the same time, affiliation switching markers are set at the section locations that cross the boundary, so that the well point action unit has a switchable affiliation relationship in different zones, thereby completing the construction of section-level coupled mapping relationships for zone control.

[0033] Step S105: Based on the segment-level coupling mapping relationship and the construction progress of the corresponding independent precipitation control zone, according to the time sequence of pilot precipitation, follow-up precipitation and maintenance precipitation, generate target water level drawdown curves for each independent precipitation control zone, and configure the corresponding allowable fluctuation thresholds according to different construction periods within the zone and the boundary connection order of adjacent zones.

[0034] The specific steps of step S105 are as follows: Step S1051: Based on the construction progress of each independent precipitation control zone and its position order in the section-level coupling mapping, the precipitation process of the independent precipitation control zone is divided into a preparatory period, an accompanying excavation period, and a maintenance and connection period, and the starting boundary segment and ending boundary segment of each period are determined respectively.

[0035] In this embodiment, based on the established segment-level coupling mapping relationship, the positional order of each independent precipitation control zone along the trench axis is first extracted, and the construction progress is mapped to this positional order, so that each zone corresponds to a clear construction entry time, duration interval, and exit time. Subsequently, using the section before construction progress enters the zone as a reference, the sections in the zone that have not yet been excavated but have entered the well point effect range are identified and designated as the preparatory period. The first position of the section affected by the well point effect is used as the starting boundary segment, and the position where the excavation operation is about to enter is used as the ending boundary segment. Furthermore, the construction progress is synchronized with the trench excavation outline. Overlapping sections are identified as accompanying excavation periods, with the starting point of excavation entering the zone as the initial boundary segment and the exit point of excavation from the zone as the ending boundary segment. Subsequently, sections where construction progresses out of the zone but wellpoint effects continue are extracted and designated as maintaining connection periods, with the excavation exit point as the initial boundary segment and the end point of wellpoint effects as the ending boundary segment. Through the above segment-by-segment identification and boundary marking based on the construction progress sequence and segment-level coupling mapping position, the precipitation process of each independent precipitation control zone is divided into three consecutive periods with clear temporal order and spatial range, and their respective initial and ending boundary segments are determined.

[0036] Step S1052: Based on the arrangement of each independent precipitation control zone on the ditch axis, sequentially associate the starting and ending boundary segments of adjacent independent precipitation control zones to form a zone boundary transfer relationship, and determine the upstream receiving segment, main execution segment and downstream transition segment of the current independent precipitation control zone accordingly.

[0037] In this embodiment, based on the arrangement order of each independent precipitation control zone along the trench axis, the starting and ending boundary segments of each zone, as determined in step S1051, are uniformly extracted and sorted sequentially from upstream to downstream according to their axis positions. Subsequently, using the boundary segments between adjacent zones as connection nodes, the ending boundary segment of the previous zone is sequentially connected to the starting boundary segment of the next zone, forming a continuous boundary correspondence between the zones. On this basis, the boundary segments corresponding to each zone are expanded and analyzed along the trench axis, and the segments located before the starting boundary segment of the current zone and connected to the ending boundary segment of the upstream zone are identified. As the upstream receiving segment, the segment located between the starting and ending boundary segments of the current partition, and directly corresponding to the excavation and well point operation of that partition, is identified as the main execution segment. The segment located after the ending boundary segment of the current partition and connecting with the starting boundary segment of the downstream partition is identified as the downstream transition segment. Furthermore, through the sequential relationship of the above boundary segments, the upstream receiving segment, main execution segment, and downstream transition segment of each partition are arranged continuously in the axial direction, thereby establishing a spatial connection relationship between partitions and corresponding to the order of construction progress in time. This completes the construction of the boundary connection relationship of the partitions and the division of the three types of functional segments within each partition.

[0038] Step S1053: According to the arrangement of the construction time periods, and in combination with the upstream receiving section, the main execution section and the downstream transition section, the target water level drawdown sections of the independent precipitation control zone are arranged in sequence, and the target water level drawdown sections are connected in sequence to form the corresponding target water level drawdown curve.

[0039] In this embodiment, the preparatory period, the accompanying excavation period, and the maintenance and connection period obtained in step S1051 are used as the timeline for the target water level scheduling. The upstream receiving section, the main execution section, and the downstream transition section determined in step S1052 are embedded into the corresponding construction periods to form a dual correspondence between "period and section". Specifically, for the preparatory period, the target water level drawdown section that transitions from the initial state to the predetermined drawdown state is determined by combining the upstream zoning precipitation status received by the upstream receiving section and the conditions of the section that is about to be excavated in the current zoning. For the accompanying excavation period, the excavation outline, soil layer, and well point action range corresponding to the main execution section are used as constraints. The sections covered by the excavation are determined segment by segment according to the order of the sections covered by the excavation. The main target drawdown segment is designed to match the depth of the excavation and the current well point's effective range. For the maintenance transition period, based on the connection relationship between the downstream transition segment and the starting boundary segment of the adjacent downstream zone, a maintenance target drawdown segment is arranged to transition from the current zone's main drawdown state to the zone's tail-end connection state. Subsequently, the preceding target drawdown segment, the main target drawdown segment, and the maintenance target drawdown segment are connected end to end in the order of the construction period, and the connection positions between adjacent drawdown segments are aligned to ensure that the end position of the previous drawdown segment corresponds to the starting position of the next drawdown segment within the same boundary segment or a continuous boundary segment range. This forms a target drawdown curve that is consistent with the construction progress rhythm, segment transition relationship, and well point action process of the independent dewatering control zone.

[0040] It should be noted that the target drawdown curve is constructed in stages. Specifically, based on the construction progress, the dewatering process is divided into multiple continuous periods, such as the preliminary preparation stage, the excavation stage, and the later maintenance stage, and the target trend of water level change is determined for each stage. In practice, the method of water level decrease over time is set according to the changes in excavation depth, well point pumping capacity, and soil permeability characteristics, such as uniform decrease or a decrease that is fast at first and then slows down. Between different stages, a continuous connection relationship is established to ensure that the water level at the end of the previous stage is consistent with the water level at the beginning of the next stage, thereby avoiding abrupt changes. In addition, between adjacent dewatering control zones, water level changes in the boundary areas are constrained to ensure a smooth transition of water level changes between different zones, avoiding water level discontinuities caused by independent zone control.

[0041] Step S1054: Based on the arrangement of each target water level drawdown segment in the target water level drawdown curve, configure corresponding allowable fluctuation thresholds for each independent precipitation control zone. Specifically, configure time-period allowable fluctuation thresholds according to the construction period and boundary allowable fluctuation thresholds according to the zone boundary transition relationship.

[0042] In this embodiment, based on the generated target water level drawdown curve, each target water level drawdown segment is first unfolded segment by segment along the construction time sequence, and the corresponding section position of each drawdown segment in the trench axis and its construction stage are extracted. Drawdown segments continuously distributed within the same construction time period are grouped to form a time-period drawdown set corresponding one-to-one with the preparatory period, the accompanying excavation period, and the maintenance connection period. Subsequently, for each time-period drawdown set, combined with the degree of excavation activity, the well point action range, and the hydrological conditions in the segment-level coupling mapping relationship within that time period, the allowable water level fluctuation range of each drawdown segment within that time period is segmented and calibrated. The fluctuation ranges of each segment within the same time period are then uniformly merged to form the corresponding time-period allowable fluctuation threshold. Based on this, the boundary segment positions between each independent precipitation control zone are further extracted along the ditch axis. Combined with the zone boundary transition relationship formed in step S1052, the drawdown segments located at the zone boundaries are individually identified. These drawdown segments are grouped according to their order in the boundary transition chain. The allowable water level fluctuation range of each boundary segment is individually limited based on the connection status between the upstream and downstream zones, forming the corresponding boundary allowable fluctuation threshold. Finally, the time period allowable fluctuation threshold and the boundary allowable fluctuation threshold are bound segment by segment according to the arrangement position of each drawdown segment in the target water level drawdown curve, so that each target water level drawdown segment has both corresponding time period constraints and boundary constraints, thereby completing the configuration of allowable fluctuation thresholds for zone control.

[0043] like Figure 2 As shown, firstly, based on the multiple pre-defined precipitation control zones, the corresponding segments of each zone are sequentially unfolded according to the trench axis direction. The segments are then sequentially labeled according to the construction progress direction, forming a segment sequence arranged along the trench extension direction. Specifically, the segment at the beginning of the trench is defined as the preceding segment, and subsequent segments are arranged sequentially according to their spatial location, forming a continuous segment structure from segment A, segment B, segment C to segment D. Simultaneously, a corresponding zone control unit is set below each segment, ensuring that each control unit spatially matches its corresponding segment. Subsequently, based on the construction progress direction, each segment and its corresponding control unit are uniformly sorted, ensuring that the arrangement order of the control units is consistent with the trench construction progress path, thus constructing a control sequence consisting of multiple control units arranged sequentially along the axis direction. On this basis, the execution order of each control unit in the time dimension is aligned with its spatial arrangement order, allowing the control units of the preceding segment to enter the execution sequence first, with the control units of subsequent segments following in sequence, thus forming a control arrangement sequence structure that combines spatial and temporal order.

[0044] Step S2: Collect water system parameters within each precipitation control zone, compare the water system parameters with the corresponding target water level drawdown curves to obtain the water level deviation, deviation change rate, and spatial gradient deviation of each precipitation control zone, and construct a comprehensive deviation signal. The comprehensive deviation signal characterizes the risk of local inrush and excessive drawdown. The water system parameters include groundwater level, pore water pressure, wellpoint vacuum, instantaneous outflow rate, and trench slope displacement data.

[0045] The specific steps of step S2 are as follows: Step S201: Using each independent precipitation control zone as a data acquisition unit, acquire groundwater level change information, well point pumping process information, and environmental information related to water body activity in each precipitation control zone, and form a water system parameter sequence for the corresponding precipitation control zone according to the acquisition time sequence.

[0046] In this embodiment, each independently defined precipitation control zone is used as the smallest data acquisition unit. First, along the spatial range of each zone in the trench axis direction, representative acquisition locations are selected according to the wellpoint action intervals and groundwater occurrence sections corresponding to the segment-level coupling mapping relationship to obtain information on groundwater level changes over time. Simultaneously, pumping process information is extracted within the corresponding wellpoint pipe action interval, including pumping start / stop status, continuous pumping periods, and changing trends during the pumping process, and spatially matched with the corresponding segment. Furthermore, environmental information related to water activity is introduced, including rainfall, surface recharge, disturbance of surrounding water bodies, and construction disturbance. Factors are projected onto the axial positions of each precipitation control zone according to their occurrence time, so that they correspond to groundwater level changes and well point pumping processes in the same time dimension. Subsequently, based on a unified collection time interval, the above-mentioned groundwater level change information, well point pumping process information, and environmental information are collected and recorded synchronously and arranged in chronological order, so that various types of information at the same collection time form a corresponding relationship within the same zone. Finally, the information corresponding to each collection time is sequentially linked to form a water system parameter sequence with continuous time series characteristics that corresponds one-to-one with the precipitation control zone, thereby realizing the time-series expression of the dynamic change process of groundwater within the zone.

[0047] Step S202: Sort the water system parameter sequences of each precipitation control zone according to the time order, and map the sorted water system parameter sequences segment by segment to the corresponding time period position of the target water level drawdown curve according to the target water level drawdown curve of the corresponding precipitation control zone to form the actual water level trajectory sequence.

[0048] In this embodiment, for the water system parameter sequence formed by each precipitation control zone, firstly, the time stamps of various parameters in the sequence are checked according to a unified acquisition time, and the acquired data with time offsets are rearranged to form a continuous and non-overlapping sequence in the time dimension. Then, the rearranged water system parameter sequence is aligned with the target drawdown curve corresponding to the precipitation control zone. Specifically, based on the construction period corresponding to each drawdown segment in the target drawdown curve and its segment position in the trench axis, each acquisition time in the water system parameter sequence is matched to the corresponding drawdown segment range, ensuring that each acquisition time is aligned with the target drawdown curve. A clear target time period location should be identified. After completing the time period matching, information reflecting the change in groundwater level status is extracted from the water system parameter sequence and collected segment by segment according to its corresponding time period location, so that multiple collection points within the same drawdown segment form a continuous arrangement of water level change segments. Furthermore, along the arrangement order of the target drawdown curve, the corresponding water level change segments within each drawdown segment are sequentially connected end to end, and connected at the boundary of adjacent drawdown segments according to the corresponding boundary segment location, so that the segments before and after maintain a continuous relationship in time and space. In this way, the original discrete water system parameter sequence is transformed into an actual water level trajectory sequence that corresponds one-to-one with the target drawdown curve.

[0049] Step S203: Compare the actual water level trajectory sequence with the corresponding positions of the target water level drawdown curve segment by segment to determine the water level deviation of each precipitation control zone in the corresponding time period, and record them in chronological order to form a zone deviation sequence.

[0050] In this embodiment, after obtaining the actual water level trajectory sequence and the target water level drawdown curve, the actual water level trajectory sequence is first synchronously segmented based on the time period division of each drawdown segment in the target water level drawdown curve, so that the two form a one-to-one correspondence at the same construction time and corresponding segment location. Subsequently, within each corresponding drawdown segment, the water level value in the actual water level trajectory is extracted point by point according to the acquisition time sequence, and compared with the target water level position in the target water level drawdown curve corresponding to that position, thereby obtaining the difference information between the actual state and the target state at the same time and the same location. Further, the acquisition times of each drawdown segment are... The corresponding difference information is organized in chronological order to form a continuous intra-segment deviation record. The connection position between adjacent drawdown segments is processed to ensure that the deviation record at the end of the previous drawdown segment and the deviation record at the beginning of the next drawdown segment maintain a temporal and spatial continuity. On this basis, the deviation records within each drawdown segment are sequentially linked according to the arrangement order of the target water level drawdown curve to form a continuous deviation expression sequence covering the entire precipitation process. This sequence is then uniformly sorted according to time, thereby obtaining the partition deviation sequence corresponding to the precipitation control zone, realizing a segmented and continuous representation of the actual water level relative to the target control state.

[0051] Step S204: Perform inter-segment correlation on the partition deviation sequence according to the continuous acquisition time sequence, determine the deviation change relationship between adjacent time periods in turn, and perform horizontal comparison of the deviation sequences of adjacent precipitation control zones at the same acquisition time to determine the spatial gradient deviation at the corresponding location.

[0052] The specific steps of step S204 are as follows: Step S2041: According to the continuous acquisition time sequence of each precipitation control zone, the corresponding zone deviation sequence is sequentially divided to form multiple time sequence deviation segments with the beginning and end connected, and the preceding time and the following time are marked for each time sequence deviation segment.

[0053] In this embodiment, after obtaining the zoning deviation sequence corresponding to each precipitation control zone, the sequence is first checked for continuity based on a unified acquisition time interval. Missing or duplicate acquisition times are corrected sequentially to ensure the deviation sequence is continuously arranged in the time dimension. Subsequently, using the time interval between adjacent acquisition times as the basic dividing criterion, the zoning deviation sequence is segmented sequentially along the time order, so that each segment consists of the deviation values ​​corresponding to two or more consecutive acquisition times, thereby forming multiple temporally continuous and interconnected time-series deviation segments. Further, After segmentation, the earliest acquisition time corresponding to the starting position of each time-series deviation segment is extracted as the preceding time, and the latest acquisition time corresponding to the ending position is extracted as the following time. The preceding and following times are then associated with the corresponding deviation segments. At the same time, the connection positions between adjacent time-series deviation segments are checked for consistency, so that the following time of the previous deviation segment and the preceding time of the next deviation segment form a continuous connection in time. Through the above processing, the original partitioned deviation sequence is transformed into a segmented structure composed of multiple time-series deviation segments with clear time boundaries.

[0054] Step S2042: Using the preceding and following times of each time series deviation segment as connection nodes, sequentially connect and associate adjacent time series deviation segments within the same precipitation control zone to determine the deviation change relationship between adjacent time periods and form the time series change chain of the corresponding precipitation control zone.

[0055] In this embodiment, based on the completed division of time-series deviation segments, the segments are first arranged according to their temporal order within each precipitation control zone, and the preceding and following times corresponding to each time-series deviation segment are extracted as time boundary markers for that segment. Then, using the following time of the preceding time-series deviation segment and the preceding time of the following time-series deviation segment as connection nodes, adjacent time-series deviation segments are paired and linked to form a continuous temporal connection. The corresponding deviation value changes are extracted at these connection nodes to characterize the deviation evolution from the previous time period to the next. Further, the aforementioned adjacent time-series deviation segments... The evolution of deviations between time series segments is recorded segment by segment in chronological order, and the change relationship of each segment is bound to its corresponding time interval, so that the change relationships are arranged continuously in the time dimension. On this basis, the succession relationship between all adjacent time series deviation segments is sequentially connected in the order of connection, so that each time series deviation segment is both connected to the previous segment and progressive to the next segment, thereby constructing a continuous change structure covering the entire precipitation process. Finally, this continuous change structure is collected according to precipitation control zones to form the time series change chain of the corresponding precipitation control zone, which is used to describe the continuous relationship of deviation evolution over time.

[0056] Step S2043: Align the positions of the partition deviation sequences of adjacent precipitation control zones according to the direction of the ditch axis, and arrange the deviation values ​​of the corresponding sections at the boundaries of adjacent zones side by side to form a transverse comparison sequence at the same time.

[0057] In this embodiment, after obtaining the zoning deviation sequence corresponding to each precipitation control zone, the boundary positions of adjacent zones are uniformly calibrated based on the actual arrangement relationship of each independent precipitation control zone along the ditch axis. The deviation records corresponding to the adjacent boundary segments in each zoning deviation sequence are then extracted. Specifically, using the boundary position between two adjacent precipitation control zones as a reference, a segment range corresponding to the boundary position is selected on both sides along the ditch axis. The deviation values ​​of the previous zone near the boundary and the next zone near the boundary are aligned under the same spatial reference, so that they correspond to the same adjacent boundary position or continuous boundary adjacent positions. The location is then determined; subsequently, using a unified acquisition time as the time alignment benchmark, the boundary deviation records that have completed spatial alignment are filtered by time, so that the deviation values ​​of adjacent zones at the same acquisition time and corresponding positions of the same boundary form a directly comparable parallel relationship; further, in the order from upstream to downstream of the trench axis, the deviation values ​​of the corresponding sections of each adjacent zone boundary are unfolded and arranged laterally, so that a lateral comparison unit reflecting the deviation distribution state on both sides of the boundary is formed at each acquisition time; finally, the lateral comparison units corresponding to each acquisition time are continuously organized in chronological order to form a lateral comparison sequence corresponding to the boundary positions of adjacent precipitation control zones at the same time.

[0058] Step S2044: Perform group-by-group comparisons on the same-time lateral comparison sequence to determine the spatial gradient deviation between adjacent precipitation control zones at corresponding locations.

[0059] In this embodiment, after obtaining the same-time lateral comparison sequence, the sequence is first expanded group by group according to the acquisition time order, so that each group corresponds to the set of deviations of adjacent precipitation control zones at the boundary corresponding section at the same time point; then, within each group, each deviation value is read sequentially along the ditch axis direction according to the zone arrangement order, and the deviation value on the upstream side is matched with the deviation value on its adjacent downstream side to form a deviation pair reflecting the difference between adjacent zones; further, the difference is identified for each deviation pair under the same spatial location reference, and the magnitude and direction of change between the two are determined. Extraction is performed and associated with the corresponding boundary segment locations to give the difference information a clear spatial positioning attribute. After processing all adjacent partition deviation pairs within a single group, the difference information corresponding to each deviation pair is arranged continuously along the axis direction to form a spatial difference expression at that acquisition time. Finally, the spatial difference expressions corresponding to each acquisition time are sequentially concatenated in chronological order to form a continuous evolution relationship of spatial differences at different time points in the time dimension. This determines the spatial gradient deviation between adjacent precipitation control zones at corresponding locations and forms a spatial gradient deviation sequence corresponding to the time series.

[0060] Step S205: The water level deviation, deviation change relationship and spatial gradient deviation corresponding to each precipitation control zone are associated and integrated according to a preset combination order to form a comprehensive deviation signal for characterizing the precipitation status of each precipitation control zone.

[0061] The specific steps of step S205 are as follows: Step S2051: Collect the corresponding water level deviation, deviation change relationship and spatial gradient deviation according to the precipitation control zone, and align the various deviation elements belonging to the same precipitation control zone in time to form a zone deviation element group.

[0062] In this embodiment, after obtaining the water level deviation sequence, deviation change relationship, and spatial gradient deviation of each precipitation control zone, the three types of deviation elements are first classified and processed by using the precipitation control zone as the basic collection unit. Various deviation information from the same precipitation control zone is extracted and aggregated into the same partition dataset. Subsequently, using a unified acquisition time as the alignment benchmark, time matching is performed on the three types of deviation elements. Each acquisition time in the water level deviation sequence is used as the main time index, and the corresponding time intervals in the deviation change relationship and the corresponding acquisition times in the spatial gradient deviation are matched one-to-one, ensuring that deviation elements from different sources are aligned in the time dimension. A one-to-one correspondence is established. During time alignment, for deviation changes with time spans, their corresponding preceding and following time boundaries are extracted and mapped to the corresponding acquisition time interval, forming a unified time reference with the water level deviation and spatial gradient deviation at discrete acquisition times. Furthermore, after completing time alignment, the water level deviation, deviation change relationship, and spatial gradient deviation corresponding to the same acquisition time are combined and aggregated, so that each acquisition time corresponds to a set of three types of deviation elements. Finally, the set structures corresponding to each time are arranged sequentially along the acquisition time sequence to form a set of partition deviation elements that correspond one-to-one with the precipitation control partition.

[0063] Step S2052: For each precipitation control zone, according to a preset combination order, the water level deviation, deviation change relationship and spatial gradient deviation in the zone deviation element group are arranged in sequence to form a corresponding zone combination sequence. Among them, the deviation elements reflecting the current zone status are arranged in the first position, the deviation elements reflecting the succession relationship of adjacent time periods are arranged in the middle position, and the deviation elements reflecting the boundary relationship of adjacent zones are arranged in the last position.

[0064] In this embodiment, after obtaining the zoning deviation element groups corresponding to each precipitation control zone, the deviation element groups at each acquisition time are first internally split, and the water level deviation, deviation change relationship, and spatial gradient deviation are extracted into three types of element units with clear semantic orientations, and the corresponding relationship is established using the acquisition time as a unified index; subsequently, according to the pre-set combination order rules, the three types of element units are arranged in order, with the water level deviation, which directly represents the water level status of the current zone, determined as the first element, the deviation change relationship, which represents the change connection relationship between the previous and next time periods within the same zone, determined as the second element, and the deviation change relationship, which represents the boundary between adjacent zones, determined as the third element. The spatial gradient deviation of the boundary difference state is determined as the subsequent element, so that the three types of elements form an element sequence with a fixed arrangement order at the same time. Furthermore, the element sequences formed at each collection time are arranged one by one in chronological order, so that the preceding, intermediate and subsequent elements at each time time form a continuous unfolding structure in the time dimension. On this basis, the element sequences corresponding to all collection times in the same precipitation control zone are sequentially connected to form a combined sequence expression that runs through the entire precipitation process, so that the sequence always maintains the arrangement logic of "current state - temporal succession - boundary relationship" in structure, thereby obtaining the partition combination sequence of the corresponding precipitation control zone.

[0065] It should be noted that the preset combination order is arranged in the order of current state first, time change second, and spatial relationship third. That is, water level deviation is considered first, deviation change relationship is considered second, and spatial gradient deviation is considered last.

[0066] Step S2053: Based on the partition combination sequence, the partition combination sequence corresponding to each acquisition time is sequentially passed along the continuous acquisition time sequence, and the preceding, median and subsequent elements between adjacent acquisition times are correlated to form the deviation integration sequence of the corresponding precipitation control partition.

[0067] In this embodiment, after obtaining the partition combination sequence, the element sequences corresponding to each acquisition time are first sequentially expanded according to the continuous acquisition time sequence. Adjacent acquisition times are used as basic transfer units to pairwise associate the element sequences of the previous and subsequent times. Specifically, between each pair of adjacent acquisition times, the preceding, median, and subsequent elements are extracted, and they are matched according to element category, so that the preceding element of the previous time forms one transfer relationship with the preceding element of the next time, and the median element of the previous time forms another transfer relationship with the median element of the next time. The subsequent elements form a third set of successive relationships with the subsequent elements at the next time moment, thus establishing a continuous correlation channel for the three types of elements in the time dimension. Subsequently, the successive relationships of the above three types of elements are combined within the same time interval, so that each adjacent collection time moment forms an integrated unit containing the correlation information of the three types of elements. Further, the integrated units are connected end to end along the collection time sequence, so that the subsequent correlation of the previous integrated unit and the preceding correlation of the next integrated unit form a continuous connection relationship in time. Finally, all integrated units are arranged in a unified time sequence to form a deviation integrated sequence that runs through the entire precipitation process.

[0068] Step S2054: The deviation integration sequence is encapsulated and marked according to the precipitation control zone, so that each precipitation control zone forms a unique integrated deviation signal at each acquisition time.

[0069] In this embodiment, after obtaining the deviation integration sequence corresponding to each precipitation control zone, the deviation integration sequence is first expanded hourly using the acquisition time as the smallest encapsulation unit. The integration unit corresponding to each acquisition time is extracted, while maintaining the existing arrangement structure of its preceding, median, and subsequent elements. Subsequently, for each integration unit, according to the identification information of the precipitation control zone, it is jointly bound with the axis position identifier, boundary segment identifier, and acquisition time identifier of the corresponding zone, so that the integration unit has a unique orientation in both spatial location and time dimension. Further, after completing the identifier binding, each integration unit is encapsulated as a whole, and it is uniformly represented as an indivisible combined expression unit, so that it can simultaneously represent the current zone status, temporal change relationship, and boundary association status. On this basis, the encapsulation units corresponding to each acquisition time are arranged sequentially in chronological order, so that each precipitation control zone forms an independent and continuous encapsulation expression at different acquisition times. Finally, through the above hourly encapsulation and marking process, each precipitation control zone forms a unique comprehensive deviation signal at each acquisition time.

[0070] Step S3: Based on the comprehensive deviation signal, perform PID calculations on each precipitation control zone to generate corresponding control commands for the precipitation control zone. The control commands are applied to the well point main pipe negative pressure adjustment unit, the branch pipeline electric valve unit, and the pumping pump frequency conversion drive unit to synchronously adjust the pumping negative pressure, branch opening degree, and pumping rate of each zone, thereby controlling the groundwater level of each precipitation control zone to converge according to the corresponding target water level drawdown curve.

[0071] The specific steps of step S3 are as follows: Step S301: Receive the corresponding comprehensive deviation signal according to the precipitation control zone, and read the comprehensive deviation signal of each precipitation control zone sequentially according to the continuous acquisition time sequence to form a zone control input sequence that corresponds one-to-one with each precipitation control zone.

[0072] In this embodiment, after obtaining the comprehensive deviation signal corresponding to each precipitation control zone, the comprehensive deviation signal of each zone is first independently received and collected, using the precipitation control zone as the basic processing unit. The signals are then checked for temporal order according to their associated acquisition time identifiers, ensuring a continuous arrangement of signals within the same zone in the time dimension. Subsequently, using the continuous acquisition time sequence as the main line, the comprehensive deviation signal of each precipitation control zone is read hourly, unfolding the comprehensive deviation signal corresponding to each acquisition time sequentially while maintaining its original encapsulation structure and identifier information during the reading process. Further, after reading, the comprehensive deviation signals corresponding to each acquisition time within the same precipitation control zone are concatenated in chronological order, forming a continuous input expression reflecting the evolution of the zone's deviation state over time. Based on this, the continuous input expressions corresponding to different precipitation control zones are categorized and stored separately, ensuring that each precipitation control zone forms an independent input sequence structure. Finally, through the above-mentioned zone reception and time-series reading processing, each precipitation control zone forms a zone control input sequence that corresponds to it one-to-one.

[0073] Step S302: Based on the partition control input sequence of each precipitation control zone, the control segment is split according to the current state, the time sequence succession state and the boundary association state to form the corresponding current control segment, succession control segment and boundary control segment.

[0074] In this embodiment, after obtaining the zoning control input sequence corresponding to each precipitation control zone, the input sequence is first expanded hourly along the continuous acquisition time sequence, and the comprehensive deviation signal corresponding to each acquisition time is extracted as the basic analysis unit. Subsequently, based on the semantic orientation of the preceding, median, and subsequent elements contained in the comprehensive deviation signal, attribute identification is performed on the signal at each acquisition time. The part reflecting the current water level status is divided into current status information, the part reflecting the connection relationship between preceding and following time periods is divided into time sequence succession information, and the part reflecting the boundary relationship between adjacent zones is divided into boundary association information. On this basis, the acquisition time is used as the dividing point. The input sequence is segmented, extracting continuous segments dominated by current state information as current control segments, segments dominated by time-series transition information spanning adjacent acquisition times as transition control segments, and segments dominated by boundary association information involving the boundaries of zones as boundary control segments. Furthermore, these three types of control segments are calibrated according to their positional relationship in the time series, forming a continuous structure that is interconnected in time. Finally, through the above-mentioned division by state attributes and organization by time sequence, the zone control input sequence of each precipitation control zone is split into corresponding current control segments, transition control segments, and boundary control segments.

[0075] It should be noted that the division of control segments is based on the magnitude and trend of the deviation signal. Specifically, during continuous data acquisition, the deviation information at each moment is analyzed: when the water level deviation of a certain zone exceeds a preset range, that time period is designated as the current control segment for direct adjustment of the current water level deviation; when the deviation trend is obvious over multiple consecutive moments, that time period is designated as a transition control segment to reflect the continuity of water level changes and perform smooth adjustment; when the water level difference between adjacent zones exceeds a preset range, that time period is designated as a boundary control segment to coordinate the water level relationship between different zones.

[0076] Step S303: Using the current control segment, successor control segment, and boundary control segment of each precipitation control zone as input, perform PID calculations on the precipitation control zone respectively, and merge the calculation results corresponding to each control segment according to the time sequence position of the precipitation control zone to form the zone control quantity of the precipitation control zone.

[0077] In this embodiment, after the control segments of each precipitation control zone are divided, the current control segment, successor control segment, and boundary control segment within the same precipitation control zone are processed independently. Each control segment is expanded according to its position in the time series, and the comprehensive deviation signal of the continuously collected time within the corresponding control segment is extracted as the calculation input. Subsequently, based on the input characteristics of different types of control segments, PID calculation is performed on each control segment. Specifically, for the current control segment, real-time response calculation is performed based on the deviation information reflecting the current water level status; for the successor control segment, continuous response calculation is performed based on the deviation change information across adjacent time periods; and for the boundary control segment, calculation is performed based on the location of the zone boundary it involves. Spatial deviation information is used to perform boundary correlation response calculations, enabling each type of control segment to generate corresponding control output results. After completing the calculations for each control segment, the calculation results of the current control segment, the successor control segment, and the boundary control segment are sequentially arranged according to the time order within the precipitation control zone. Sequential merging is then performed at the junctions of adjacent control segments, ensuring a temporal continuity between the final calculation result of the previous control segment and the initial calculation result of the next control segment. Furthermore, the merged calculation results are then concatenated along the time dimension, allowing the outputs of different types of control segments to form a unified expression within the same time frame. Finally, the zone control quantity corresponding to the precipitation control zone and covering the entire control process is obtained.

[0078] Step S304: Based on the control quantities of each precipitation control zone, arrange the control quantities of each zone sequentially according to the zone arrangement order in the direction of the gully axis, and combine the boundary connection relationship between adjacent precipitation control zones to transfer and adjust the control quantities of the zones at the boundary positions to form a draft sequence of control instructions corresponding to each precipitation control zone.

[0079] The specific steps of step S304 are as follows: Step S3041: Extract the corresponding zone control quantities according to the precipitation control zones, and bind each zone control quantity to the position of the corresponding precipitation control zone in the direction of the trench axis to form a one-to-one zone control unit.

[0080] In this embodiment, after obtaining the control quantities corresponding to each precipitation control zone, the control quantities of each zone are first extracted independently according to the division results of the precipitation control zones, and classified using the zone identifier as an index, so that each zone control quantity has a clear zone affiliation. Subsequently, based on the spatial unfolding relationship of the trench axis, the position interval of each precipitation control zone in the axis direction is extracted, and the position interval is converted into spatial identifier information that can be corresponding to the zone control quantity. On this basis, each zone control quantity is associated and bound with the axis position identifier of its corresponding precipitation control zone, so that the control quantity not only reflects the control results in the time series, but also has a clear spatial positioning attribute. Further, the bound zone control quantities are structured and organized, and combined in the form of "zone identifier - axis position identifier - control quantity expression", so that each data unit contains control content and its corresponding spatial position relationship. Finally, through the above extraction and binding process, a one-to-one correspondence is formed between the control quantity of each precipitation control zone and its position in the trench axis direction, thereby constructing a zone control unit with spatial positioning characteristics.

[0081] Step S3042: Based on the position of each partition control unit, arrange each partition control unit sequentially along the trench axis to form a control arrangement sequence consistent with the trench advancement direction.

[0082] In this embodiment, after obtaining each zone control unit, the trench axis position identifier bound to each zone control unit is first extracted, and this position identifier is uniformly converted to the same axis coordinate reference system, so that different zone control units have a comparable sorting basis in the spatial dimension. Subsequently, based on the axis extension direction corresponding to the construction advancement direction, the arrangement benchmark along the axis from upstream to downstream or from the starting construction end to the advancement end is determined, and the position of each zone control unit is compared using this as the sorting direction. Zone control units with earlier axis positions are arranged at the front of the sequence, and zone control units with later axis positions are arranged at the back, thus forming an initial ordered sequence. Further, after completing the initial sorting, the boundary connection relationship between adjacent zone control units is checked for consistency, so that adjacent units do not overlap or misalign in the axis position, and the positions of units with overlapping or intersecting boundaries are adjusted to form a continuous and conflict-free arrangement relationship in the axis direction. On this basis, the adjusted zone control units are connected in series according to the sorting result, so that each unit forms a sequence structure that unfolds continuously along the trench axis in space. Finally, a control layout sequence consistent with the trench construction advancement direction is obtained.

[0083] Step S3043: Perform a handover process on the adjacent partition control units in the control arrangement sequence, and sequentially connect the tail control content of the preceding partition control unit with the first control content of the following partition control unit according to the adjacent boundary position to form a continuously arranged handover control sequence.

[0084] In this embodiment, after forming a control arrangement sequence arranged in an orderly manner along the trench axis, adjacent partition control units are extracted one by one according to the arrangement order. The start and end control segments of each partition control unit in the time series are identified and mapped to the first and last control contents, respectively. Subsequently, using the boundary position of adjacent partitions on the trench axis as a spatial reference, the last control contents of the preceding partition control unit near the boundary position are matched with the first control contents of the following partition control unit near the boundary position, so that the two establish a correspondence at the same boundary position. Further, the matched tail... The control content of each segment is spliced ​​together with the first segment of control content in chronological order, so that the last segment of control content of the preceding segment naturally transitions to the first segment of control content of the following segment in time, and the continuous expression of control information is maintained at the connection point. After completing the handover process of a single pair of control units, the same operation is performed on all adjacent control units along the control arrangement sequence, so that the control content between each segment establishes a continuous connection relationship at the spatial boundary. Finally, all the control content after handover process is connected in series along the trench axis direction to form a handover control sequence that covers all precipitation control zones and maintains continuity in both space and time.

[0085] Step S3044: According to the arrangement position, boundary sequence and precipitation control zone of each partition control unit in the relay control sequence, write the control quantity of each partition into the corresponding instruction bit segment in sequence to form the control instruction draft sequence corresponding to each precipitation control zone.

[0086] In this embodiment, after obtaining the transfer control sequence, each partition control unit in the sequence is first expanded according to the trench axis direction, and the partition identifier, axis position identifier, and their sequential position relationship in the transfer sequence are extracted for each control unit. Then, using the boundary connection position between adjacent partition control units in the transfer control sequence as the dividing criterion, the control content of each control unit is segmented, dividing it into control content segments corresponding to different spatial segments while maintaining the temporal continuity of each segment. Based on this, according to the arrangement position of each partition control unit in the transfer sequence and its corresponding precipitation control partition, the control content is further divided... The segments are mapped sequentially to a preset command segment structure, prioritizing the writing of control content at the beginning of the sequence into the preceding command segment, and sequentially writing control content at the end of the sequence into the following command segments. Simultaneously, at the corresponding positions of adjacent partition boundaries, the connecting segments of the preceding and following control units are written into consecutive command segments to maintain sequential consistency at the boundaries. Furthermore, each written command segment is marked with its corresponding partition affiliation, establishing a correspondence between each command segment and its spatial location within the corresponding precipitation control partition. Finally, all sequentially written and marked command segments are concatenated to form a control command draft sequence consistent with the successive control sequence structure.

[0087] Step S305: Perform time-series addressing and partition marking on the control instruction draft sequence according to the precipitation control partition, and generate control instructions for the corresponding precipitation control partition.

[0088] The specific steps of step S305 are as follows: Step S3051: Extract the control instruction grass sequence into segments according to the precipitation control zone, and merge consecutive instruction segments belonging to the same precipitation control zone to form corresponding zone grass instruction segments.

[0089] In this embodiment, after obtaining the draft sequence of control instructions, the sequence is first expanded segment by segment, and the precipitation control zone identifier corresponding to each instruction segment and its arrangement position in the sequence are extracted. Subsequently, along the arrangement order of the draft sequence of control instructions, adjacent instruction segments with the same precipitation control zone identifier are identified for continuity. Instruction segments that are adjacent to each other in the sequence and have the same zone identifier are classified into the same candidate segment, and the boundary position between different zone identifiers is marked. Based on this, the draft sequence of control instructions is segmented using the boundary position as the dividing node, so that each segment consists of continuous instruction segments of the same precipitation control zone, thereby forming multiple instruction sub-sequences divided by zone. Further, the instruction segments within each instruction sub-sequence are processed to maintain their order according to their position in the original sequence, so that the instruction content after segmentation is consistent with the original draft sequence of control instructions in terms of time and space. Finally, each instruction sub-sequence is merged to form a zone draft instruction segment corresponding to the precipitation control zone, so that each zone corresponds to one or more continuous instruction expression segments.

[0090] Step S3052: Based on the sequential position of each partition grass instruction segment in the continuous control timing, configure the corresponding timing address for each partition grass instruction segment, and arrange the timing addresses sequentially according to the acquisition time, control round, and boundary handover order.

[0091] In this embodiment, after obtaining the command segments for each partition, the command segments are first expanded segment by segment along the continuous control timing sequence, and their arrangement position in the control command sequence and the corresponding acquisition time identifier are extracted as the basic reference for timing positioning. Subsequently, according to the order of each command segment in the time sequence, a unique timing address is assigned to each command segment, so that the timing address can reflect its time position in the overall control flow. On this basis, the acquisition time information is embedded in the timing address to distinguish the command segments under different time nodes, and a control round identifier is further introduced to hierarchically distinguish the command segments that are repeatedly executed or cyclically executed under the same acquisition time. At the same time, combined with the boundary transfer relationship formed in step S3043, a boundary transfer order identifier is introduced for the command segments located at the partition boundary, so that they reflect the sequential connection relationship with adjacent partitions in the timing address. Finally, the various identifiers containing acquisition time, control round and boundary transfer order are combined and arranged according to predetermined rules so that the timing addresses corresponding to each command segment form an ordered arrangement structure in the overall sequence.

[0092] Step S3053: Associate and bind each partition grass instruction segment with the partition identifier, axis position identifier and boundary segment identifier of the corresponding precipitation control partition to form a partition pending instruction segment with timing address and partition mark.

[0093] In this embodiment, after completing the timing addressing of each zone grass command segment, the identification information of each zone grass command segment is first extracted to obtain its corresponding precipitation control zone number and the segment location range in the trench axis, and the location range is converted into a unified axis location identifier. Subsequently, combined with the zone boundary division results determined in the previous steps, the segment covered by each zone grass command segment is boundary-determined to identify whether it involves the zone start boundary segment, end boundary segment, or segment inside the zone, and a corresponding boundary segment identifier is generated accordingly. On this basis, the zone identifier, axis location identifier, and boundary segment identifier are bound one by one with the corresponding zone grass command segment, and jointly organized with the original timing address of the zone grass command segment, so that each command segment has both time positioning information and spatial attribution information. Further, the command segments that have completed multiple identifier bindings are structurally integrated and uniformly represented as a combined unit containing "timing address - zone identifier - axis location - boundary segment attribute - command content". Finally, a zone command segment to be issued with complete timing and spatial markings is formed.

[0094] Step S3054: According to the order of the time-series addresses, encapsulate and output the instruction segments to be sent in each partition in sequence to generate the control instructions corresponding to each precipitation control partition.

[0095] In this embodiment, after obtaining the instruction segments to be sent from each partition, they are first uniformly sorted according to the timing address carried by each instruction segment. All instruction segments to be sent from partition are arranged in order of their timing addresses from first to last, so that each instruction segment forms a continuous and conflict-free output sequence in the time dimension. Subsequently, the instruction segments to be sent from each partition are extracted segment by segment from the sorted sequence, and the integrity of the partition identifier, axis position identifier, and boundary segment identifier bound within them is checked to ensure that each instruction segment has clear time and spatial positioning information before output. On this basis, the instruction segments to be sent from each partition are processed segment by segment according to the sorting order. The instruction is encapsulated and expressed as an independent control instruction unit in a structured manner, maintaining its indivisible overall form during output. Furthermore, the timing continuity between adjacent instruction segments is preserved during encapsulation, ensuring that the end timing of the previous instruction segment and the start timing of the next instruction segment are sequentially linked in address, thus guaranteeing the continuity of the overall control process. Finally, the encapsulated instruction units are output sequentially according to their timing addresses, forming a control instruction sequence covering each precipitation control zone. This allows each zone to receive its matching control instruction at the corresponding time, thereby achieving control instruction generation based on both zone and timing constraints.

[0096] It should be noted that, regarding the construction of the comprehensive deviation signal, the generation of control parameters, and the control execution mechanism involved in the precipitation control process, the key algorithm steps and parameter determination methods are further clearly defined. In terms of constructing the comprehensive deviation signal, the multi-source deviation information of each precipitation control zone at each acquisition time is uniformly quantified and normalized. Specifically, water level deviation, deviation change rate, and spatial gradient deviation are standardized to map them to a unified dimension interval (e.g., [-1,1] or [0,1]), and a comprehensive deviation signal is generated based on a weighted fusion method. The weight coefficients of each deviation are set or dynamically adjusted according to the construction stage, soil permeability, and well point drainage capacity, so that the comprehensive deviation signal can reflect the dominant control needs of the current zone. For example, the weight of water level deviation is increased in the initial excavation stage, and the weight of spatial gradient deviation is increased at the zone boundary stage, thereby dynamically switching the control target from rapid precipitation to a stable transition.

[0097] In terms of control parameter generation, the proportional, integral, and derivative parameters in PID control are determined using a mapping method based on engineering characteristic parameters. Specifically, the soil permeability coefficient, groundwater recharge intensity, and well point density are used as input variables for control parameter adjustment. The corresponding PID parameter ranges are determined through preset functional relationships or table lookup methods, and dynamic corrections are made based on real-time deviation signals during the control process. Specifically, when a continuous increase in water level deviation is detected, the proportional coefficient is increased to enhance the response speed; when deviation oscillation is detected, the derivative coefficient is increased to suppress overshoot; and when steady-state error exists, cumulative correction is performed through the integral term. Through this method, the PID control process has a clear parameter source and adjustment logic.

[0098] like Figure 3 As shown, step S4: Precisely dewater the well points in the pipeline trench based on the control command.

[0099] In this embodiment, after generating control commands covering each precipitation control zone, the corresponding commands are first allocated to the well point action range corresponding to each precipitation control zone based on the zone identifier and axis position identifier carried in each control command, so that each zone receives the matching control command within its corresponding spatial range. Subsequently, the pumping process of each zone's well point is scheduled hourly according to the time sequence address in the control commands, so that the control commands corresponding to each acquisition time are executed sequentially at the corresponding time nodes, thereby forming continuous adjustment of the well point pumping process in the time dimension. During execution, the control quantity corresponding to the control command is mapped to the specific adjustment content of the well point pumping behavior. This includes segmented adjustments to the pumping intensity, affected sections, and duration of action, ensuring that the precipitation behavior of different zones at different time stages aligns with the corresponding control commands. Furthermore, along the trench axis, for the boundary sections between adjacent zones, the pumping behavior of well points in adjacent zones is controlled in a seamless manner according to the boundary section identifiers and transition sequences shown in the control commands, creating a continuous spatial transition in the precipitation process of the boundary areas. Finally, through the aforementioned command execution process based on zone identifiers, time sequence addresses, and boundary relationships, well point precipitation unfolds within each precipitation control zone according to a predetermined time sequence and spatial relationship, thereby achieving refined regulation of the well point precipitation process in the pipeline trench.

[0100] like Figure 3 As shown, the pipeline trench is divided into two adjacent zones, A and B, along the axial direction. Clear boundaries are established between the two zones, and wellpoint pipes are installed within each zone to form corresponding precipitation zones. Specifically, multiple wellpoints are installed in zone A, arranged along the trench slope and extending downwards to the groundwater reservoir. Through wellpoint pumping, groundwater is drawn from the surrounding soil to the wellpoints and discharged upwards along the pumping path, forming a localized precipitation zone within zone A. Simultaneously, wellpoints are installed in the same manner in zone B, ensuring their pumping action covers the corresponding groundwater influence area of ​​zone B, thus forming an independent precipitation zone within zone B. Water control zone; based on this, by deploying well points on both sides of the zone boundary, the precipitation influence range of zone A and zone B overlaps at the boundary, thus forming a continuous water level transition zone in space, avoiding sudden water level changes caused by independent zone control; furthermore, under the pumping action of the well points, groundwater flows from the deep layer to the well points in the direction shown by the arrow, causing the groundwater level at the bottom of the trench and around the pipeline to gradually decrease and be maintained below the bottom of the pipeline excavation; finally, through the coordinated pumping action of the well points in each zone, the zoned control and overall continuous regulation of the groundwater level along the trench are achieved, thus completing the precise dewatering process of the pipeline trench.

[0101] Example 2 Please see Figure 4Another embodiment of the present invention provides: a precision dewatering system for pipeline trench wellpoints based on PID control, comprising: a curve generation module, a deviation signal construction module, a control command generation module, and a dewatering control module; The curve generation module is used to divide the trench into multiple independent dewatering control zones according to the relevant parameters of the pipeline trench, establish a trench-soil-wellpoint coupling mapping relationship, and generate the target water level drawdown curve and allowable fluctuation threshold corresponding to each dewatering control zone. The relevant parameters of the pipeline trench include the planar orientation of the pipeline trench, excavation depth, soil permeability coefficient, initial groundwater depth, wellpoint pipe layout parameters, and construction progress. The deviation signal construction module is used to collect water system parameters in each precipitation control zone, compare the water system parameters with the corresponding target water level drawdown curve, obtain the water level deviation, deviation change rate and spatial gradient deviation of each precipitation control zone, and construct a comprehensive deviation signal. The comprehensive deviation signal characterizes the risk of local inrush and excessive drawdown. The water system parameters include groundwater level, pore water pressure, well point vacuum, instantaneous outflow rate and trench slope displacement data. The control command generation module performs PID calculations on each precipitation control zone based on the comprehensive deviation signal to generate control commands for the corresponding precipitation control zone. The control commands are applied to the well point main pipe negative pressure adjustment unit, the branch pipeline electric valve unit, and the pumping pump frequency conversion drive unit to synchronously adjust the pumping negative pressure, branch opening degree, and pumping rate of each zone, thereby controlling the groundwater level of each precipitation control zone to converge according to the corresponding target water level drawdown curve. The precipitation control module performs precise precipitation control on the well points in the pipeline trench based on the control commands.

[0102] In addition, the parts of the technical solutions provided in the embodiments of this application that are consistent with the implementation principles of the corresponding technical solutions in the prior art have not been described in detail, so as to avoid excessive elaboration.

[0103] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for accurate dewatering of a pipe trench well point based on PID control, characterized in that, include: Based on the relevant parameters of the pipeline trench, the trench is divided into multiple independent dewatering control zones. A coupled mapping relationship between the trench, soil layer, and well point is established, and the target water level drawdown curve and allowable fluctuation threshold corresponding to each dewatering control zone are generated. The relevant parameters of the pipeline trench include the horizontal orientation of the pipeline trench, excavation depth, soil permeability coefficient, initial groundwater depth, well point pipe layout parameters, and construction progress. Water system parameters are collected in each precipitation control zone. The water system parameters are compared with the corresponding target water level drawdown curves to obtain the water level deviation, deviation change rate and spatial gradient deviation of each precipitation control zone. A comprehensive deviation signal is constructed. The comprehensive deviation signal represents the risk of local inrush and excessive drawdown. The water system parameters include groundwater level, pore water pressure, well point vacuum, instantaneous outflow rate and trench slope displacement data. Based on the comprehensive deviation signal, PID calculations are performed on each precipitation control zone to generate corresponding control commands for the precipitation control zone. These control commands are applied to the well point main pipe negative pressure adjustment unit, the branch pipeline electric valve unit, and the pumping pump frequency conversion drive unit, respectively, to synchronously adjust the pumping negative pressure, branch opening, and pumping rate of each zone, thereby controlling the groundwater level of each precipitation control zone to converge according to the corresponding target water level drawdown curve. Precise dewatering is carried out at the well points in the pipeline trench based on the aforementioned control commands.

2. The PID control-based pipe trench well point precision dewatering method according to claim 1, wherein, The process involves dividing the trench into multiple independent dewatering control zones based on relevant parameters, establishing a trench-soil-wellpoint coupling mapping relationship, and generating target drawdown curves and allowable fluctuation thresholds for each dewatering control zone, including: The planar orientation, excavation depth, soil permeability coefficient, initial groundwater depth, wellpoint pipe layout parameters, and construction progress of the pipeline trench are obtained. The trench axis is then discretized along the planar orientation according to a preset length to form a basic segment sequence consistent with the construction progress direction. Identify the points of excavation depth change, soil layer boundary, groundwater depth inflection point, well point pipe layout change, and construction progress switching point in each foundation segment. Project the change points onto the trench axis and divide and correct the foundation segment column to form the initial control sub-segment. The soil permeability continuity, groundwater recharge trend, well point drainage coverage and construction sequence connection of adjacent initial control sub-segments are compared segment by segment. When adjacent initial control sub-segments meet the preset association conditions, they are merged. When they do not meet the preset association conditions, the boundary is retained, and multiple independent precipitation control zones are formed along the trench. The trench excavation outline, soil layer distribution, groundwater occurrence section and well point action range of each independent precipitation control zone are sequentially associated to establish a section-level coupling mapping relationship, and the well point action ranges that overlap across zones are marked with a switching attribute. Based on the segment-level coupling mapping relationship and the construction progress of the corresponding independent precipitation control zones, target water level drawdown curves are generated for each independent precipitation control zone, and corresponding allowable fluctuation thresholds are configured according to different construction periods within the zone and the boundary connection order of adjacent zones.

3. The PID control-based pipe trench well point precision dewatering method according to claim 2, characterized in that, Based on the segment-level coupling mapping relationship and the construction progress of the corresponding independent precipitation control zones, target water level drawdown curves are generated for each independent precipitation control zone. Corresponding allowable fluctuation thresholds are configured according to different construction periods within the zone and the boundary connection order of adjacent zones, including: Based on the construction progress of each independent precipitation control zone and its position order in the section-level coupling mapping, the precipitation process of the independent precipitation control zone is divided into a preparatory period, an accompanying excavation period, and a connection period, and the starting and ending boundary segments of each period are determined respectively. Based on the arrangement of each independent precipitation control zone on the gully axis, the starting and ending boundary segments of adjacent independent precipitation control zones are sequentially associated to form a zone boundary transition relationship, and the upstream receiving segment, main execution segment, and downstream transition segment of the current independent precipitation control zone are determined accordingly. According to the arrangement of the construction periods, and in combination with the upstream receiving section, the main execution section and the downstream transition section, the target water level drawdown sections of the independent precipitation control zone are arranged in sequence, and the target water level drawdown sections are connected in sequence to form the corresponding target water level drawdown curve. Based on the arrangement of each target water level drawdown segment in the target water level drawdown curve, a corresponding allowable fluctuation threshold is configured for each independent precipitation control zone. Specifically, the allowable fluctuation threshold for the time period is configured according to the construction period, and the allowable fluctuation threshold for the boundary is configured according to the boundary transition relationship of the zone.

4. The PID control based precision dewatering method of pipe trench well point according to claim 1, wherein, The process involves collecting water system parameters within each precipitation control zone, comparing these parameters with the corresponding target water level drawdown curves to obtain the water level deviation, deviation change rate, and spatial gradient deviation for each precipitation control zone, and constructing a comprehensive deviation signal, including: Using each independent precipitation control zone as a data acquisition unit, groundwater level change information, well point pumping process information, and environmental information related to water body activity are acquired in each precipitation control zone, and a water system parameter sequence for the corresponding precipitation control zone is formed according to the acquisition time sequence. The water system parameter sequences of each precipitation control zone are sorted according to time order, and the sorted water system parameter sequences are mapped segment by segment to the corresponding time period position of the target water level drawdown curve according to the target water level drawdown curve of the corresponding precipitation control zone to form the actual water level trajectory sequence. The actual water level trajectory sequence is compared segment by segment with the corresponding position of the target water level drawdown curve to determine the water level deviation of each precipitation control zone in the corresponding time period, and the deviation sequence of each zone is recorded in chronological order. The partition deviation sequence is correlated with each segment according to the continuous acquisition time sequence to determine the deviation change relationship between adjacent time periods. At the same acquisition time, the deviation sequences of adjacent precipitation control zones are compared horizontally to determine the spatial gradient deviation at the corresponding location. The water level deviation, deviation change relationship, and spatial gradient deviation corresponding to each precipitation control zone are correlated and integrated according to a preset combination order to form a comprehensive deviation signal.

5. The PID control-based pipe trench well point precision dewatering method according to claim 4, characterized in that, The zonal deviation sequences are correlated inter-segmentally according to the continuous acquisition time sequence to determine the deviation change relationship between adjacent time periods. Furthermore, the deviation sequences of adjacent precipitation control zones are compared laterally at the same acquisition time to determine the spatial gradient deviation at corresponding locations, including: According to the continuous acquisition time sequence of each precipitation control zone, the corresponding zone deviation sequence is sequentially divided to form multiple time sequence deviation segments with the beginning and end connected, and the preceding and following times are marked for each time sequence deviation segment. Using the preceding and following times of each time series deviation segment as connection nodes, adjacent time series deviation segments within the same precipitation control zone are sequentially linked to determine the deviation change relationship between adjacent time periods and form a time series change chain for the corresponding precipitation control zone. The positions of the zoning deviation sequences of adjacent precipitation control zones are aligned according to the direction of the ditch axis. The deviation values ​​of the corresponding sections at the boundaries of adjacent zones are arranged side by side to form a lateral comparison sequence at the same moment. The same-time lateral comparison sequence is compared group by group to determine the spatial gradient deviation between adjacent precipitation control zones at corresponding locations.

6. The PID control-based pipe trench well point precision dewatering method according to claim 5, wherein, The process involves associating and integrating the water level deviations, deviation variation relationships, and spatial gradient deviations corresponding to each precipitation control zone according to a preset combination order to form a comprehensive deviation signal, including: According to the precipitation control zones, the corresponding water level deviations, deviation change relationships, and spatial gradient deviations are collected separately. The deviation elements belonging to the same precipitation control zone are aligned in time to form a zone deviation element group. For each precipitation control zone, the water level deviation, deviation change relationship and spatial gradient deviation in the zone deviation element group are arranged in a preset combination order to form a corresponding zone combination sequence. Based on the partition combination sequence, the partition combination sequence corresponding to each acquisition time is sequentially passed along the continuous acquisition time sequence to form the deviation integration sequence of the corresponding precipitation control partition. The deviation integration sequence is encapsulated and labeled according to the precipitation control zone, so that each precipitation control zone forms a unique integrated deviation signal at each acquisition time.

7. The PID control based precision dewatering method of pipe trench well point according to claim 1, wherein, The method of performing PID calculations on each precipitation control zone based on the comprehensive deviation signal to generate corresponding control instructions for the precipitation control zone includes: The comprehensive deviation signals corresponding to the precipitation control zones are received separately, and the comprehensive deviation signals of each precipitation control zone are read sequentially according to the continuous acquisition time sequence to form a zone control input sequence that corresponds one-to-one with each precipitation control zone. Based on the partition control input sequence of each precipitation control zone, the control segment is divided according to the current state, the time sequence succession state and the boundary association state to form the corresponding current control segment, succession control segment and boundary control segment; Using the current control segment, successor control segment, and boundary control segment of each precipitation control zone as input, PID calculations are performed on the precipitation control zone respectively, and the calculation results corresponding to each control segment are merged according to the time sequence position of the precipitation control zone to form the zone control quantity of the precipitation control zone. Based on the control quantities of each precipitation control zone, the control quantities of each zone are sequentially arranged according to the order of the zones along the gully axis, forming a draft sequence of control instructions corresponding to each precipitation control zone. The control instruction draft sequence is time-series addressed and zone-marked according to the precipitation control zone to generate control instructions for the corresponding precipitation control zone.

8. The PID control-based pipe trench well point precision dewatering method according to claim 7, wherein, The control quantities of each precipitation control zone are arranged sequentially according to the zone arrangement order along the gully axis, forming a draft sequence of control instructions corresponding to each precipitation control zone, including: Extract the corresponding zone control quantities according to the precipitation control zones, and bind each zone control quantity with the position of the corresponding precipitation control zone in the direction of the trench axis to form a one-to-one zone control unit. Based on the position of each zone control unit, the zone control units are arranged sequentially along the trench axis to form a control arrangement sequence consistent with the trench advancement direction. The adjacent partition control units in the control arrangement sequence are handed over to each other. The control content of the last segment of the preceding partition control unit is sequentially connected with the control content of the first segment of the following partition control unit according to the adjacent boundary position to form a continuous handover control sequence. According to the arrangement position, boundary sequence and precipitation control zone of each partition control unit in the relay control sequence, the control quantity of each partition is written into the corresponding instruction bit segment in sequence to form the control instruction draft sequence corresponding to each precipitation control zone.

9. The PID control-based pipe trench well point precision dewatering method according to claim 8, wherein, The draft sequence of control instructions is time-series addressed and zone-marked according to precipitation control zones to generate control instructions for the corresponding precipitation control zones, including: The control instruction sequence is segmented and extracted according to the precipitation control zone, and consecutive instruction segments belonging to the same precipitation control zone are merged to form the corresponding zone instruction segment. Based on the sequential position of each partition's draft instruction segment in the continuous control timing sequence, a corresponding timing address is configured for each partition's draft instruction segment, and the timing addresses are arranged sequentially according to the acquisition time, control round, and boundary handover order. Each zoning command segment is associated and bound with the corresponding precipitation control zone's zone identifier, axis position identifier, and boundary segment identifier to form a zoning command segment to be issued with a time sequence address and zone marker. According to the order of the time-series addresses, the instruction segments to be sent in each partition are encapsulated and output sequentially to generate the control instructions corresponding to each precipitation control partition.

10. A pipeline trench wellpoint precision dewatering system based on PID control, used to implement the pipeline trench wellpoint precision dewatering method based on PID control as described in any one of claims 1-9, characterized in that, include: Curve generation module, deviation signal construction module, control command generation module, and precipitation control module; The curve generation module is used to divide the trench into multiple independent dewatering control zones according to the relevant parameters of the pipeline trench, establish a trench-soil-wellpoint coupling mapping relationship, and generate the target water level drawdown curve and allowable fluctuation threshold corresponding to each dewatering control zone. The relevant parameters of the pipeline trench include the planar orientation of the pipeline trench, excavation depth, soil permeability coefficient, initial groundwater depth, wellpoint pipe layout parameters, and construction progress. The deviation signal construction module is used to collect water system parameters in each precipitation control zone, compare the water system parameters with the corresponding target water level drawdown curve, obtain the water level deviation, deviation change rate and spatial gradient deviation of each precipitation control zone, and construct a comprehensive deviation signal. The comprehensive deviation signal characterizes the risk of local inrush and excessive drawdown. The water system parameters include groundwater level, pore water pressure, well point vacuum, instantaneous outflow rate and trench slope displacement data. The control command generation module performs PID calculations on each precipitation control zone based on the comprehensive deviation signal to generate control commands for the corresponding precipitation control zone. The control commands are applied to the well point main pipe negative pressure adjustment unit, the branch pipeline electric valve unit, and the pumping pump frequency conversion drive unit to synchronously adjust the pumping negative pressure, branch opening degree, and pumping rate of each zone, thereby controlling the groundwater level of each precipitation control zone to converge according to the corresponding target water level drawdown curve. The precipitation control module performs precise precipitation control on the well points in the pipeline trench based on the control commands.

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