Large-flow mud circulating system and deslagging method for super-large-section shaft construction

Abstract

The application discloses a large-flow mud circulating system and a deslagging method for super-large-section shaft construction, and belongs to the technical field of tunnels and underground engineering. The deslagging method comprises the following steps: collecting mud pressure, concentration, flow rate and excavation face muck profile data of each branch pipeline; fusing the collected multi-dimensional observation data to generate an excavation face muck deposition thermal diagram, identifying a high-risk muck accumulation area and calculating a target suction flow instruction value for optimizing flow distribution; adjusting the valves and pump groups of each branch pipeline based on the target suction flow instruction value, driving the jet nozzle to perform targeted flushing on the high-risk area and forming a local reinforced circulating flow; and continuously pumping the mud containing muck to the ground slurry treatment station through the annular main pipe, and the ground station performs solid-liquid separation on the muck-containing mud. The application dynamically adjusts the mud circulating operation in the super-large-section shaft construction in real time, accurately identifies and processes the muck accumulation area, and ensures efficient and sustainable cleaning operation.

Description

Technical Field

[0001] This application relates to the field of tunnel and underground engineering technology, and more particularly to a high-flow-rate mud circulation system and slag removal method for ultra-large cross-section vertical shaft construction. Background Technology

[0002] Large-section vertical shaft construction refers to the construction of large-scale vertical shafts excavated underground or underwater. It is typically used in projects such as tunnels, underground transportation facilities, subways, and water supply and drainage pipelines. Due to the large area and depth of the shaft opening and the complex construction environment, this type of construction involves large-scale earthwork excavation and the construction of support structures. It requires particularly sophisticated design and construction techniques to ensure the stability of the shaft structure and construction safety.

[0003] High-flow mud circulation refers to the use of mud as a transport medium during construction. The mud is carried away from the excavation face by a high-flow pumping system, and the circulation method effectively cleans up the excavated soil in the construction area. It is usually used in the construction of ultra-large cross sections or deep foundation pits. Through strong suction and fluid dynamics, the mud fluidity in the construction area is maintained, avoiding soil accumulation and ensuring the smooth progress of construction operations.

[0004] Existing technologies for slag removal in ultra-large cross-section vertical shafts suffer from several drawbacks. First, they fail to accurately identify slag deposits, making it difficult to locate slag-stagnant zones. Second, they are slow and inaccurate in flow control, making it difficult to dynamically respond to changes in operating conditions. Third, they lack a coordinated mechanism between jet flushing and pipeline suction, making it impossible to form an efficient local circulation. Ultimately, this results in poor targeting of slag removal operations, requiring repeated processing and leading to overall low efficiency.

[0005] No effective solutions have yet been proposed to address the problems in the relevant technologies. Summary of the Invention

[0006] To overcome the above problems, this application aims to propose a high-flow-rate mud circulation system and slag removal method for ultra-large cross-section vertical shaft construction. The purpose is to solve the problems of inaccurate identification of slag deposits in the mud circulation slag removal of ultra-large cross-section vertical shafts, which leads to difficulties in locating slag retention areas; lagging and inaccurate flow control, which makes it difficult to dynamically respond to changes in working conditions; and the lack of a coordinated mechanism between jet flushing and pipeline suction, which makes it impossible to form an efficient local circulation. Ultimately, this results in poor targeting of slag removal operations, the need for repeated processing, and low overall efficiency.

[0007] Therefore, the specific technical solution adopted in this application is as follows:

[0008] Firstly, this application improves a high-flow-rate mud circulation and slag removal method for ultra-large cross-section vertical shaft construction, the slag removal method comprising:

[0009] S1. Real-time data collection of mud pressure, concentration, flow rate and excavation face profile data of each branch pipe is obtained by using multi-source sensors pre-installed on the vertical shaft excavation face to arrange the annular main pipe and radial branch pipes.

[0010] S2. The multi-dimensional observation data collected by the fusion is used to generate a thermal map of the excavation face soil deposition, identify high-risk slag retention areas and calculate the target suction flow command value for optimizing flow distribution.

[0011] S3. Adjust the valves and pumps of each branch pipeline based on the target suction flow command value, drive the jet nozzle to target the high-risk area and form a local enhanced circulation;

[0012] S4. The slurry containing slag is continuously pumped to the ground slurry treatment station through the ring main pipe. The ground station performs solid-liquid separation on the slag-containing slurry and adjusts the density, viscosity and solids content of the return slurry online according to the separation results.

[0013] Optionally, a thermal map of excavated soil deposition is generated by fusing the collected multidimensional observation data, including:

[0014] The collected data on mud pressure, concentration, flow rate, and excavation face spoil distribution are preprocessed.

[0015] Spatial interpolation technology is used to map the preprocessed multidimensional observation data onto the excavation face grid, and the slag concentration of each excavation face grid is calculated by inversion to form a slag deposition heat map;

[0016] Based on the thermal map of slag deposition, and combined with the preset slag concentration threshold and regional importance weight, the risk assessment of slag concentration levels in each region is carried out, and a distribution map of slag risk levels is generated.

[0017] Alternatively, the method for generating a thermal map of slag deposits is as follows:

[0018] The preprocessed multi-source observation data are uniformly registered to the excavation face grid coordinate system, and the grid cell to which each observation data point belongs is labeled to form an observation dataset;

[0019] Based on the observation dataset, the spatial interpolation algorithm is used to calculate the nearest observation points required for the soil concentration of each grid cell, and the corresponding set of interpolation weight coefficients is determined.

[0020] The interpolation weight coefficient set and the observation dataset are used to perform weighted calculations on each grid cell to generate a soil concentration distribution matrix that represents the concentration values ​​at different grid locations;

[0021] The soil concentration distribution matrix is ​​rendered using a gradient according to a preset color mapping rule to output a soil deposition heat map.

[0022] Optionally, the expression for calculating the target suction flow command value used to optimize flow allocation is:

[0023] ;

[0024] In the formula, Indicates the first i The target suction flow rate command value for the branch pipeline; Indicates the jet-targeted scouring enhancement coefficient; Indicates the first i The overall risk value of sludge retention in the area covered by the branch pipeline; Indicates the first n A nearby pipeline; Indicates the first i The path leads to the branch pipe and the adjacent first n The cooperative circulation coupling coefficient of the road; Indicates the first i The basic suction flow rate of the path to the branch pipeline; This represents the risk-weighted gain coefficient; Indicates the first i The set of meshes on the excavated face where the path is drawn into or jetted onto the branch pipes; Indicates the first Regional importance weights for each grid cell; Indicates the first The volume concentration of slag and soil after spatial interpolation of each grid; This indicates the preset threshold for sludge concentration; This indicates the maximum soil and debris concentration across the entire grid at the excavation face.

[0025] Optionally, the method of driving the jet nozzle to target and scour the high-risk area and form a locally enhanced circulation is as follows:

[0026] The target suction flow command value is converted into the specific flow setting value of each branch pipeline, the coordinates of the high-risk area are extracted, and the initial target position sequence of the jet nozzle is generated.

[0027] Based on the region associated with the initial target location sequence, real-time mud pressure data of each corresponding branch pipe suction port is collected, and the pressure deviation between the expected pressure corresponding to the flow rate set value is calculated.

[0028] Based on the urgency of the pipeline load as represented by the pressure deviation, the initial target position sequence of the jet nozzle is dynamically prioritized to generate an action execution sequence;

[0029] The jet nozzle is driven to the target coordinates to perform directional flushing according to the action execution sequence, and the flow rate setting value of the suction pipeline in the vicinity of the flushed area is increased. Through the synergy of jet disturbance and enhanced suction, a local enhanced circulation is formed in the current area.

[0030] Optionally, the method for generating the action execution sequence is as follows:

[0031] Based on the collected real-time pressure deviation data, the load urgency index of the pipeline associated with the coordinates of each high-risk area in the initial target location sequence is calculated.

[0032] Based on the load urgency index from high to low, the coordinates of all high-risk areas in the initial target location sequence are rearranged to generate a priority task list sorted in descending order of urgency.

[0033] The priority task list is converted into an action execution sequence with the operation coordinates, order, and specific suction pipeline identifiers that need to be linked and adjusted at each operation point.

[0034] Optionally, the expression for the load urgency index is:

[0035] ;

[0036] In the formula, Indicates the first i Load urgency index of the branch pipeline along the path and the pipeline associated with the coordinates of the high-risk area; Represents the weighting coefficients for the rheological, pressure, and concentration coupling terms; Indicates the first i Real-time pressure deviation of branch pipelines along the path; This indicates the maximum historical pressure deviation for the entire pipeline; Indicates the first i Real-time mud viscosity in branch pipelines along the path; Indicates the design reference mud viscosity; Indicates the first i Average volume concentration of slag in the area covered by the branch pipeline along the path; Indicates the design reference soil concentration; Represents the weighting coefficients of the risk transmission coupling term; Indicates the first i The overall risk value of sludge retention in the area covered by the branch pipeline; Indicates the first i The path leads to the branch pipe and the adjacent first q Cooperative circulation coupling coefficient of the path to the branch pipeline; Indicates the first q The overall risk value of sludge retention in the area covered by the branch pipeline; This indicates the maximum overall risk value of sludge retention in the entire site; Indicates the first i Real-time suction flow rate from the path to the branch pipeline; Indicates the first i The rated maximum suction flow rate of the branch pipeline along the path; This represents the weighting factor for the basic load item; Indicates the first i The set of neighboring pipelines of the path branching pipeline.

[0037] Alternatively, a method for creating a locally enhanced circulation in the current region through the synergy of jet perturbation and enhanced pumping is as follows:

[0038] Extract the currently pending operation instructions from the action execution sequence. The operation instructions include the target operation coordinates of the jet nozzle and the specific suction pipeline identifier that needs to be adjusted in conjunction with the operation.

[0039] Based on the target operation coordinates, drive the jet nozzle to move to the designated position and start the high-pressure jet to perform jet-targeted disturbance on the slag and soil accumulation in the target area;

[0040] According to the suction pipeline markings, increase the real-time flow setting value of the corresponding suction pipeline, and adjust its valves and pump set in a closed loop to enable the pipeline to synchronously perform enhanced suction.

[0041] Under the synergistic effect of jet-targeted disturbance and pipeline-enhanced suction, a localized forced circulation of mud is formed in the current target area, and the current area is marked as having been synergistically treated.

[0042] Secondly, this application also provides a high-flow-rate mud circulation system for ultra-large cross-section vertical shaft construction, the system comprising:

[0043] The multi-source real-time sensing module is used to collect data on the mud pressure, concentration, flow rate, and excavation face profile of each branch pipe in real time using multi-source sensors pre-installed on the vertical shaft excavation face, which are arranged in a ring main pipe and radial branch pipes.

[0044] The analysis and decision module is used to integrate the collected multi-dimensional observation data to generate a thermal map of excavated soil deposition, identify high-risk slag retention areas, and calculate the target suction flow command value to optimize flow distribution.

[0045] The circulation control module adjusts the valves and pumps of each branch pipeline based on the target suction flow command value, and drives the jet nozzle to target and flush the high-risk area and form a local enhanced circulation.

[0046] The mud treatment module is used to continuously pump mud containing slag through a ring main to a ground mud and water treatment station. The ground station performs solid-liquid separation on the slag-containing mud and adjusts the density, viscosity and solids content of the return mud online based on the separation results.

[0047] Compared with the prior art, this application has the following beneficial effects:

[0048] 1. This application integrates high-precision sensor data, spatial interpolation algorithms, and flow optimization to dynamically adjust mud circulation operations in the construction of ultra-large cross-section vertical shafts in real time, accurately identify and handle slag-stagnant areas, and ensure efficient and sustainable cleaning operations; the synergistic effect of jet nozzles and pipelines to enhance suction effectively improves slag removal efficiency, and intelligent operation scheduling is achieved through load urgency indicators.

[0049] 2. This application achieves the generation of high-precision thermal maps of slag deposition through multi-dimensional observation data fusion and spatial interpolation technology. By assessing the risk of slag retention in different areas, the flow distribution is optimized. It can accurately identify the distribution of slag deposition and high-risk areas in the construction of ultra-large cross-section vertical shafts, thereby effectively guiding flow regulation and flushing operations, and ensuring efficient and targeted slag removal.

[0050] 3. This application achieves dynamic priority ranking of high-risk areas and targeted flushing of jet nozzles by accurately collecting pressure deviation data and calculating load urgency index, thus optimizing the real-time adjustment of pipeline flow.

[0051] 4. This application ensures the high efficiency and targeted nature of slag removal by combining jet disturbance with enhanced suction, while effectively preventing the regeneration of slag-stagnant areas and improving the response speed and operational efficiency of the entire construction process. Attached Figure Description

[0052] The above-mentioned features, characteristics, and advantages of this application, as well as their implementation methods, will become clearer and more understandable in conjunction with the following description of the embodiments, which are illustrated in detail with reference to the accompanying drawings. Schematic diagrams are shown here:

[0053] Figure 1 This is a flowchart of a high-flow-rate mud circulation and slag removal method for ultra-large cross-section vertical shaft construction, as described in this application. Detailed Implementation

[0054] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0055] The first embodiment of this application provides a high-flow-rate mud circulation and slag removal method for ultra-large cross-section vertical shaft construction. By integrating high-precision sensor data, spatial interpolation algorithms, and flow optimization, it can dynamically adjust the mud circulation operation in real time during ultra-large cross-section vertical shaft construction, accurately identify and handle slag-stagnant areas, and ensure efficient and sustainable cleaning operations. The synergistic effect of jet nozzles and pipelines to enhance suction effectively improves slag removal efficiency, and intelligent operation scheduling is achieved through load urgency indicators, such as... Figure 1 As shown, the slag removal method includes:

[0056] S1. Multi-source sensors pre-installed on the vertical shaft excavation face, arranged in a ring main pipe and radial branch pipes, are used to collect data on the mud pressure, concentration, flow rate and excavation face profile of each branch pipe in real time.

[0057] It should be explained that the multi-source sensors include: mud pressure sensor, mud concentration / density sensor, mud flow meter, and excavation face spoil profile monitoring device;

[0058] Among them, the mud pressure sensor is installed at the inlet or key section of each radial branch pipeline to monitor the mud transport resistance and pipeline health status of the branch.

[0059] Mud concentration / density sensors are also installed in each branch pipeline to monitor the content of solid particles (slag) in the mud in real time;

[0060] Mud flow meters are installed in each branch pipeline to accurately measure the real-time mud suction or transport flow of each branch, and are key to flow balance control and efficiency calculation.

[0061] Excavation face spoil contour monitoring device: It usually uses underground industrial camera devices, laser scanners or sonar and other non-contact detection devices to obtain two-dimensional or three-dimensional image data of the accumulation height, distribution range and shape of the spoil on the excavation face, so as to intuitively reflect the spoil accumulation status.

[0062] S2. The multi-dimensional observation data collected is integrated to generate a thermal map of the excavation face soil deposition, identify high-risk slag retention areas, and calculate the target suction flow command value for optimizing flow distribution.

[0063] Preferably, the multi-dimensional observation data collected is integrated to generate a thermal map of excavated soil deposition at the excavation face, including:

[0064] The collected data on mud pressure, concentration, flow rate, and excavation face spoil distribution are preprocessed.

[0065] Spatial interpolation technology is used to map the preprocessed multidimensional observation data onto the excavation face grid, and the slag concentration of each excavation face grid is calculated by inversion to form a slag deposition heat map;

[0066] Based on the thermal map of slag deposition, and combined with the preset slag concentration threshold and regional importance weight, the risk assessment of slag concentration levels in each region is carried out, and a distribution map of slag risk levels is generated.

[0067] Preferably, the method for generating a thermal map of slag and soil deposition is as follows:

[0068] The preprocessed multi-source observation data are uniformly registered to the excavation face grid coordinate system, and the grid cell to which each observation data point belongs is labeled to form an observation dataset;

[0069] Based on the observation dataset, the spatial interpolation algorithm is used to calculate the nearest observation points required for the soil concentration of each grid cell, and the corresponding set of interpolation weight coefficients is determined.

[0070] The interpolation weight coefficient set and the observation dataset are used to perform weighted calculations on each grid cell to generate a soil concentration distribution matrix that represents the concentration values ​​at different grid locations;

[0071] The soil concentration distribution matrix is ​​rendered using a gradient according to a preset color mapping rule to output a soil deposition heat map.

[0072] Preferably, the expression for calculating the target suction flow command value used to optimize flow allocation is:

[0073] ;

[0074] In the formula, Indicates the first i The target suction flow rate command value for the branch pipeline; Indicates the jet-targeted scouring enhancement coefficient; Indicates the first i The overall risk value of sludge retention in the area covered by the branch pipeline; Indicates the first n A nearby pipeline; Indicates the first i The path leads to the branch pipe and the adjacent first n The cooperative circulation coupling coefficient of the road; Indicates the first i The basic suction flow rate of the path to the branch pipeline; This represents the risk-weighted gain coefficient; Indicates the first i The set of meshes on the excavated face where the path is drawn into or jetted onto the branch pipes; Indicates the first Regional importance weights for each grid cell; Indicates the first The volume concentration of slag and soil after spatial interpolation of each grid; This indicates the preset threshold for sludge concentration; This indicates the maximum soil and debris concentration across the entire grid at the excavation face.

[0075] It should be explained that the background is a caisson-type vertical shaft excavation project with a depth of 16 ring segments;

[0076] The tunneling progress is currently at the 8th ring segment, with an excavation chamber diameter of 20m, divided into 10×10 grids (a total of 100 grid units).

[0077] Slurry circulation configuration: slurry inlet pump, slurry outlet pump, with a total of 4 radial slurry outlets (numbered...). i =1 to 4), each discharge port corresponds to 1 radial branch pipe, covering 25 grids;

[0078] The triggering conditions are: abnormal liquid level in the excavation chamber (requires flow difference adjustment) + sludge buildup in the area covered by No. 3 discharge port (triggers flushing mode);

[0079] Preset parameters: Sludge concentration threshold =0.4 (the soil particles in a caisson are coarser, resulting in a higher threshold), the maximum soil concentration in the entire site. =0.9 slurry pump base speed corresponding to flow rate 80m 3 / h Basic flow rate of grout pump =75m 3 / h;

[0080] Slurry outlet number i The value is 3, and the basic flow rate is 80m³ / min. 3 / h, with adjacent discharge outlets 2 and 4, and the cooperative circulation coupling coefficient. middle It is 0.7. It is 0.6;

[0081] The grid data covering the No. 3 discharge port (slag detection triggered by flushing mode) is shown in Table 1.

[0082] Table 1. Cover grid data for slurry discharge port No. 3

[0083]

[0084] Based on the data in Table 1, the flow rate of the high-pressure plunger pump for flushing the cutting head is 20 m³ / s. 3 / h (additional flow rate to target flow rate when discharge port is blocked);

[0085] Jet Targeted Brush Enhancement Coefficient The risk-weighted gain coefficient is 0.3. It is 0.6;

[0086] Substitute into the target flow formula The calculated target suction flow rate command for the third path branch pipeline is 230 m³ / s. 3 / h;

[0087] The slurry level in the excavation chamber is controlled by the flow difference between the inlet and outlet pumps; the target slurry level corresponds to a flow difference of 5m. 3 / h, therefore the target flow rate of the slurry pump is 235m³ / h. 3 / h;

[0088] Therefore, in tunneling mode, the target flow rate of the slurry pump is 230 m³ / h. 3 / h; the target flow rate of the slurry pump is 235m³ / h. 3 / h;

[0089] When the soil concentration in the grid covering the No. 3 slurry discharge port rises to 0.7, the flushing mode is triggered:

[0090] Open the bypass manual ball valve and add 20m of flushing flow from the high-pressure plunger pump. 3 / h, the target flow rate of the slurry discharge pump in the final flushing mode is 250m³ / h. 3 / h, the target flow rate of the slurry pump is 255m³ / h. 3 / h.

[0091] S3. Adjust the valves and pump sets of each branch pipeline based on the target suction flow command value, drive the jet nozzle to target and flush the high-risk area and form a local enhanced circulation.

[0092] Preferably, the method for driving the jet nozzle to target and scour high-risk areas and form locally enhanced circulation is as follows:

[0093] The target suction flow command value is converted into the specific flow setting value of each branch pipeline, the coordinates of the high-risk area are extracted, and the initial target position sequence of the jet nozzle is generated.

[0094] Based on the region associated with the initial target location sequence, real-time mud pressure data of each corresponding branch pipe suction port is collected, and the pressure deviation between the expected pressure corresponding to the flow rate set value is calculated.

[0095] Based on the urgency of the pipeline load as represented by the pressure deviation, the initial target position sequence of the jet nozzle is dynamically prioritized to generate an action execution sequence;

[0096] The jet nozzle is driven to the target coordinates to perform directional flushing according to the action execution sequence, and the flow rate setting value of the suction pipeline in the vicinity of the flushed area is increased. Through the synergy of jet disturbance and enhanced suction, a local enhanced circulation is formed in the current area.

[0097] Preferably, the method for generating the action execution sequence is as follows:

[0098] Based on the collected real-time pressure deviation data, the load urgency index of the pipeline associated with the coordinates of each high-risk area in the initial target location sequence is calculated.

[0099] Based on the load urgency index from high to low, the coordinates of all high-risk areas in the initial target location sequence are rearranged to generate a priority task list sorted in descending order of urgency.

[0100] The priority task list is converted into an action execution sequence with the operation coordinates, order, and specific suction pipeline identifiers that need to be linked and adjusted at each operation point.

[0101] Preferably, the expression for the load urgency index is:

[0102] ;

[0103] In the formula, Indicates the first i Load urgency index of the branch pipeline along the path and the pipeline associated with the coordinates of the high-risk area; Represents the weighting coefficients for the rheological, pressure, and concentration coupling terms; Indicates the first i Real-time pressure deviation of branch pipelines along the path; This indicates the maximum historical pressure deviation for the entire pipeline; Indicates the first i Real-time mud viscosity in branch pipelines along the path; Indicates the design reference mud viscosity; Indicates the first i Average volume concentration of slag in the area covered by the branch pipeline along the path; Indicates the design reference soil concentration; Represents the weighting coefficients of the risk transmission coupling term; Indicates the first i The overall risk value of sludge retention in the area covered by the branch pipeline; Indicates the first i The path leads to the branch pipe and the adjacent first q Cooperative circulation coupling coefficient of the path to the branch pipeline; Indicates the first q The overall risk value of sludge retention in the area covered by the branch pipeline; This indicates the maximum overall risk value of sludge retention in the entire site; Indicates the first i Real-time suction flow rate from the path to the branch pipeline; Indicates the first i The rated maximum suction flow rate of the branch pipeline along the path; This represents the weighting factor for the basic load item; Indicates the first iThe set of neighboring pipelines of the path branching pipeline.

[0104] Preferably, the method for forming a locally enhanced circulation in the current region through the synergy of jet perturbation and enhanced suction is as follows:

[0105] Extract the currently pending operation instructions from the action execution sequence. The operation instructions include the target operation coordinates of the jet nozzle and the specific suction pipeline identifier that needs to be adjusted in conjunction with the operation.

[0106] Based on the target operation coordinates, drive the jet nozzle to move to the designated position and start the high-pressure jet to perform jet-targeted disturbance on the slag and soil accumulation in the target area;

[0107] According to the suction pipeline markings, increase the real-time flow setting value of the corresponding suction pipeline, and adjust its valves and pump set in a closed loop to enable the pipeline to synchronously perform enhanced suction.

[0108] Under the synergistic effect of jet-targeted disturbance and pipeline-enhanced suction, a localized forced circulation of mud is formed in the current target area, and the current area is marked as having been synergistically treated.

[0109] S4. The slurry containing slag is continuously pumped to the ground slurry treatment station through the ring main pipe. The ground station performs solid-liquid separation on the slag-containing slurry and adjusts the density, viscosity and solids content of the return slurry online according to the separation results.

[0110] It should be noted that the following specific parameters are preset: the weighting coefficients of the rheological, pressure, and concentration coupling terms. The weighting coefficient for the risk transmission coupling term is 0.4. The weighting factor for the basic load item is 0.3. =0.3 (satisfies) =1);

[0111] Maximum historical pressure deviation of the entire pipeline The design reference mud viscosity is 0.8 MPa. The design reference concentration for slag is 0.05 Pa·s. The maximum comprehensive risk value for slag retention is 0.4. The rated maximum suction flow rate of pipeline No. 3 is 0.5. 300m 3 / h;

[0112] From the high-risk grid covered by pipeline No. 3, the four coordinates with the highest concentration were selected as the initial targets. ;

[0113] For pipeline No. 3 ( i =3), the sensor collects real-time operating data;

[0114] Real-time pressure deviation =0.3 MPa; Real-time mud viscosity =0.06; average slag concentration The overall risk of sludge retention is 0.45. 0.26; Real-time suction flow rate 230m 3 / h;

[0115] The load urgency index is calculated based on the above parameters. It is 0.5174;

[0116] If the urgency level of both pipelines 2 and 4 is detected simultaneously... ≈0.38 If the value is approximately 0.45, then sort by urgency from highest to lowest.

[0117] Action execution sequence = Pipeline No. 3 ( =0.5174) → Pipeline No. 4 ( =0.45) → Pipeline No. 2 ( =0.38);

[0118] Execute a coordinated action for the high-risk area coordinates (6, 7) of pipeline No. 3;

[0119] Drive the jet nozzle to coordinates (6, 7) and start the high-pressure water plunger pump (flow rate 20m³ / h). 3 / h, pressure 10MPa), to target and disturb the slag and soil accumulation area;

[0120] The target flow rate of pipeline No. 3 was changed from 230m³. 3 / h increased to 250m 3 / h, closed-loop regulating valves and pump sets to maintain stable flow;

[0121] Under the combined effect of jet disturbance and enhanced suction, a forced mud circulation is formed in this area, and the excavated soil is quickly carried out, marking this area as treated.

[0122] The second embodiment of this application also provides a high-flow-rate mud circulation system for ultra-large cross-section vertical shaft construction, the system comprising:

[0123] The multi-source real-time sensing module is used to collect data on the mud pressure, concentration, flow rate, and excavation face profile of each branch pipe in real time using multi-source sensors pre-installed on the vertical shaft excavation face, which are arranged in a ring main pipe and radial branch pipes.

[0124] The analysis and decision module is used to integrate the collected multi-dimensional observation data to generate a thermal map of excavated soil deposition, identify high-risk slag retention areas, and calculate the target suction flow command value to optimize flow distribution.

[0125] The circulation control module adjusts the valves and pumps of each branch pipeline based on the target suction flow command value, and drives the jet nozzle to target and flush the high-risk area and form a local enhanced circulation.

[0126] The mud treatment module is used to continuously pump mud containing slag through a ring main to a ground mud and water treatment station. The ground station performs solid-liquid separation on the slag-containing mud and adjusts the density, viscosity and solids content of the return mud online based on the separation results.

[0127] In addition, it should be noted that the slurry pump delivers the slurry prepared by the ground slurry treatment system to the excavation face of the caisson-type vertical shaft tunneling machine through the slurry pipeline. The flow rate of the slurry is adjusted by regulating the speed of the slurry pumps and the flow rate difference is used to regulate the liquid level in the excavation chamber. The discharge pump sucks out the slurry carrying the excavated soil from the excavation chamber and delivers it to the ground slurry treatment system through the discharge pipeline for treatment so that it can be reused.

[0128] It should be noted that the calculation formulas and all parameters involved in the calculations in this application have been dimensionless beforehand. The process of dimensionless processing is well known in the industry and will not be described here.

[0129] Although the present application has disclosed the preferred embodiments above, the embodiments are merely examples for the purpose of illustration and are not intended to limit the present application. Those skilled in the art can make some modifications and refinements without departing from the spirit and scope of the present application. The scope of protection claimed by the present application should be determined by the claims.

Claims

1. A method for high-flow-rate mud circulation and slag removal in the construction of ultra-large cross-section vertical shafts, characterized in that, The slag removal method includes: S1. Using multi-source sensors pre-installed on the vertical shaft excavation face to arrange the annular main pipe and radial branch pipes, multi-dimensional observation data including mud pressure, concentration, flow rate and excavation face slag contour data of each branch pipe are collected in real time. S2. Integrate multi-dimensional observation data to generate a thermal map of excavated soil deposition at the excavation face, identify high-risk slag retention areas and calculate the target suction flow command value for optimizing flow distribution; S3. Adjust the valves and pump groups of each branch pipeline based on the target suction flow command value, drive the jet nozzle to target and flush the high-risk sludge retention area and form a local enhanced circulation. S4. The slurry containing slag is continuously pumped to the ground slurry treatment station through the ring main pipe. The ground station performs solid-liquid separation on the slag-containing slurry and adjusts the density, viscosity and solids content of the return slurry online according to the separation results. The fusion of multi-dimensional observation data to generate a thermal map of excavated soil deposition includes: The collected data on mud pressure, concentration, flow rate, and excavation face profile are preprocessed. Spatial interpolation technology is used to map the preprocessed multidimensional observation data onto the excavation face grid, and the soil concentration of each excavation face grid is calculated by inversion to obtain the soil deposition heat map of the excavation face. Based on the thermal map of excavated soil deposition, combined with the preset slag concentration threshold and regional importance weight, the risk assessment of slag concentration levels in each region is carried out, and a slag risk level distribution map is generated. The method for obtaining the thermal map of excavated soil deposition is as follows: The preprocessed multi-source observation data are uniformly registered to the excavation face grid coordinate system, and the grid cell to which each observation data point belongs is labeled to form an observation dataset; Based on the observation dataset, the spatial interpolation algorithm is used to calculate the nearest observation points required for the soil concentration of each grid cell, and the corresponding set of interpolation weight coefficients is determined. The interpolation weight coefficient set and the observation dataset are used to perform weighted calculations on each grid cell to generate a soil concentration distribution matrix that represents the concentration values ​​at different grid locations; The soil concentration distribution matrix is ​​rendered using a gradient according to a preset color mapping rule to generate a thermal map of soil deposition at the excavation face.

2. The high-flow-rate mud circulation and slag removal method for ultra-large cross-section vertical shaft construction according to claim 1, characterized in that, The expression for the target suction flow command value used to optimize flow allocation is as follows: In the formula, Indicates the first i The target suction flow rate command value for the branch pipeline; Indicates the jet-targeted scouring enhancement coefficient; Indicates the first i The overall risk value of sludge retention in the area covered by the branch pipeline; Indicates the first n A nearby pipeline; Indicates the first i The path leads to the branch pipe and the adjacent first n The cooperative circulation coupling coefficient of the road; Indicates the first i The basic suction flow rate of the path to the branch pipeline; This represents the risk-weighted gain coefficient; Indicates the first i The set of meshes on the excavated face where the path is drawn into or jetted onto the branch pipes; Indicates the first Regional importance weights for each grid cell; Indicates the first The volume concentration of slag and soil after spatial interpolation of each grid; This indicates the preset threshold for sludge concentration; This indicates the maximum soil and debris concentration across the entire grid at the excavation face.

3. The high-flow-rate mud circulation and slag removal method for ultra-large cross-section vertical shaft construction according to claim 1, characterized in that, The method for using the driving jet nozzle to target and flush high-risk slag-retention areas and create locally enhanced circulation is as follows: The target suction flow rate command value is converted into the specific flow rate setting value of each branch pipeline, the coordinates of the high-risk sludge retention area are extracted, and the initial target position sequence of the jet nozzle is generated. Based on the region associated with the initial target location sequence, real-time mud pressure data of each corresponding branch pipe suction port is collected, and the pressure deviation between the expected pressure corresponding to the flow rate set value is calculated. Based on the urgency of the pipeline load as represented by the pressure deviation, the initial target position sequence of the jet nozzle is dynamically prioritized to generate an action execution sequence; The jet nozzle is driven to the target coordinates to perform directional flushing according to the action execution sequence, and the flow rate setting value of the suction pipeline in the vicinity of the flushed area is increased. Through the synergy of jet disturbance and enhanced suction, a local enhanced circulation is formed in the current area.

4. The high-flow-rate mud circulation and slag removal method for ultra-large cross-section vertical shaft construction according to claim 3, characterized in that, The method for generating the action execution sequence is as follows: Based on the collected real-time pressure deviation data, the load urgency index of the pipeline associated with the coordinates of each high-risk slag retention zone in the initial target location sequence is calculated. According to the load urgency index from high to low, the coordinates of all high-risk slag retention areas in the initial target location sequence are rearranged to generate a priority task list sorted in descending order of urgency. The priority task list is converted into an action execution sequence with the operation coordinates, order, and specific suction pipeline identifiers that need to be linked and adjusted at each operation point.

5. The high-flow-rate mud circulation and slag removal method for ultra-large cross-section vertical shaft construction according to claim 4, characterized in that, The expression for the load urgency index is: In the formula, Indicates the first i Load urgency index of the branch pipeline along the path and the pipeline associated with the coordinates of the high-risk slag retention area; Represents the weighting coefficients for the rheological, pressure, and concentration coupling terms; Indicates the first i Real-time pressure deviation of branch pipelines along the path; This indicates the maximum historical pressure deviation for the entire pipeline; Indicates the first i Real-time mud viscosity in branch pipelines along the path; Indicates the design reference mud viscosity; Indicates the first i Average volume concentration of slag in the area covered by the branch pipeline along the path; Indicates the design reference soil concentration; Represents the weighting coefficients of the risk transmission coupling term; Indicates the first i The overall risk value of sludge retention in the area covered by the branch pipeline; Indicates the first i The path leads to the branch pipe and the adjacent first q Cooperative circulation coupling coefficient of the path to the branch pipeline; Indicates the first q The overall risk value of sludge retention in the area covered by the branch pipeline; This indicates the maximum overall risk value of sludge retention in the entire site; Indicates the first i Real-time suction flow rate from the path to the branch pipeline; Indicates the first i The rated maximum suction flow rate of the branch pipeline along the path; This represents the weighting factor for the basic load item; Indicates the first i The set of neighboring pipelines of the path branching pipeline.

6. The method for high-flow-rate mud circulation and slag removal in ultra-large cross-section vertical shaft construction according to claim 5, characterized in that, The method for forming a locally enhanced circulation in the current region through the synergy of jet perturbation and enhanced suction is as follows: Extract the currently pending operation instructions from the action execution sequence. The operation instructions include the target working coordinates of the jet nozzle and the identification of the specific suction pipeline that needs to be adjusted in conjunction with it. Based on the target operation coordinates, drive the jet nozzle to move to the designated position and start the high-pressure jet to perform jet-targeted disturbance on the slag and soil accumulation in the target area; According to the suction pipeline markings, increase the real-time flow setting value of the corresponding suction pipeline, and adjust its valves and pump set in a closed loop to enable the pipeline to synchronously perform enhanced suction. Under the synergistic effect of jet-targeted disturbance and pipeline-enhanced suction, a localized forced circulation of mud is formed in the current target area, and the current area is marked as having been synergistically treated.

7. A high-flow-rate mud circulation system for ultra-large cross-section vertical shaft construction, used to achieve the high-flow-rate mud circulation and slag removal method for ultra-large cross-section vertical shaft construction as described in any one of claims 1-6, characterized in that, The system includes: The multi-source real-time sensing module is used to collect multi-dimensional observation data in real time, including mud pressure, concentration, flow rate and excavation face profile data, by using multi-source sensors pre-installed on the vertical shaft excavation face to arrange the annular main pipe and radial branch pipes. The analysis and decision module is used to integrate multi-dimensional observation data to generate a thermal map of excavated soil deposition, identify high-risk slag retention areas, and calculate the target suction flow command value to optimize flow distribution. The circulation control module adjusts the valves and pumps of each branch pipeline based on the target suction flow command value, and drives the jet nozzle to target and flush the high-risk sludge retention area to form a local enhanced circulation. The mud treatment module is used to continuously pump mud containing slag through a ring main to a ground mud and water treatment station. The ground station performs solid-liquid separation on the slag-containing mud and adjusts the density, viscosity and solids content of the return mud online based on the separation results.

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