Subway shield tunnel segment external pressure control system based on automatic monitoring

Abstract

The invention relates to the technical field of data processing, in particular to a subway shield tunnel segment external pressure control system based on automatic monitoring, and the system comprises a setting module which is used for setting a pressure sensor, a position sensor and a strain sensor on a segment by precisely recognizing the structure of the segment; the data acquisition module acquires sensor data in real time based on a preset frequency; the pressure analysis module draws a pressure change diagram and judges that the pressure of the duct piece is abnormal, or adjusts the preset frequency; the deformation analysis module receives the deformation analysis instruction, determines the deformation degree of the duct piece based on a radial deformation degree determined based on a plurality of real-time positions and an annular strain degree determined based on a plurality of real-time resistance values, and adjusts a water pressure threshold value according to a comparison result of the deformation degree and a preset deformation degree to generate a drainage instruction; the drainage module receives a drainage instruction and determines the opening number and distribution of water diversion ports based on adjustment of a preset water pressure threshold value and the segment deformation degree. The safety of the metro shield tunnel segment structure is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of data processing, and in particular to an external pressure control system for a subway shield tunnel segment based on automatic monitoring. Background Art

[0002] When the subway shield passes through hard rock areas, the pipe segments will be affected by the fissure water in the rock strata, resulting in pipe segment floating, joint leakage, sudden water gushing from the pipe segments, and even cracking of the pipe segments. In urban construction, there is a close connection between the subway shield tunnel and the underground facility layout of the surrounding houses and buildings.

[0003] The patent document of Chinese patent application publication number CN109000899A discloses a shield tunnel segment gap opening measuring device, which is used to calculate the size of the shield tunnel segment gap opening and the water seepage rate according to the water pressure at a certain depth, including a water bag sandwiched between two segment gaps, characterized in that the water bag is connected to an outer conduit and an inner conduit, wherein the water bag is divided into three parts: a middle water bag, an outer water bag and an inner water bag which are interconnected, the middle water bag is sandwiched between the two segments, the outer water bag is located on the outside of the tunnel and is connected to the outer conduit, and the inner water bag is located on the inside of the tunnel and is connected to the inner conduit; the outer conduit uses a pressure pump to draw water from the first water pool to the pressure pump of the water bag, and the pressure pump is connected to a pressure gauge for measuring water pressure; the inner conduit is connected to a pressure control valve and a flow meter capable of measuring water pressure, which are used to drain the seeping water to the second water pool.

[0004] The existing technology mainly focuses on calculating the size of the gap opening and the water seepage rate of the pipe segment through water pressure, and focuses on the local hydraulic parameters at the pipe segment gap, such as inferring the gap opening only by sensing the water pressure change in the gap through a water bag. However, there is a lack of comprehensive and real-time monitoring methods for the water pressure distribution on the overall outer surface of the pipe segment and the resulting overall deformation of the pipe segment, which may lead to the inability to accurately grasp the actual pressure conditions of the entire pipe segment in different areas, resulting in the low safety of the subway shield tunnel segment. Summary of the invention

[0005] To this end, the present invention provides a subway shield tunnel segment external pressure control system based on automatic monitoring, which can solve the problem of low structural safety of the subway shield tunnel segment when it is subjected to external water pressure by accurately adjusting the water pressure thresholds corresponding to each area of ​​the subway shield tunnel segment and adjusting the water discharge strategy.

[0006] To achieve the above object, the present invention provides a subway shield tunnel segment external pressure control system based on automatic monitoring, comprising:

[0007] A setting module is used to identify the structure of the subway shield tunnel segment, so as to set a plurality of pressure sensors, a plurality of position sensors and a plurality of strain gauges on the subway shield tunnel segment according to the structure identification result;

[0008] A data acquisition module, connected to the setting module, for acquiring a number of real-time pressure values ​​corresponding to any of the pressure sensors, a number of real-time positions corresponding to any of the position sensors, and a number of real-time resistance values ​​corresponding to any of the strain gauges in real time based on a preset frequency;

[0009] A pressure analysis module, connected to the data acquisition module, for drawing an actual pressure change graph according to a number of real-time pressure values ​​corresponding to any of the pressure sensors, analyzing the actual pressure change graph based on a preset water pressure threshold to determine a single-point abnormality, determining the number of abnormalities based on a number of single-point abnormalities, comparing the number of abnormalities with a preset number threshold, judging the segment pressure abnormality based on the number comparison result, or, analyzing the change trend of the number of abnormalities, judging the segment pressure abnormality based on the change trend analysis result, or, adjusting the preset frequency;

[0010] a deformation analysis module connected to the pressure analysis module, configured to receive the deformation analysis instruction, determine the radial deformation degree based on the plurality of real-time positions, determine the hoop strain degree based on the plurality of real-time resistance values, determine the segment deformation degree based on the radial deformation degree and the hoop strain degree, adjust the preset water pressure threshold value based on the comparison result between the segment deformation degree and the preset deformation degree, and generate a water release instruction;

[0011] The water discharge module is connected to the deformation analysis module, and is used to receive the water discharge instruction, and determine the opening number and opening distribution of the water inlets on the subway shield tunnel segment based on adjusting the preset water pressure threshold and the deformation degree of the segment.

[0012] Furthermore, the setting module includes:

[0013] A structure identification unit, for identifying the corresponding vault area, waist area and bottom area of ​​any of the subway shield tunnel segments based on the preset installation state thereof;

[0014] a setting unit connected to the structure identification unit, configured to set a first preset interval, a second preset interval, and a third preset interval based on the crown region, the waist region, and the bottom region, to set a plurality of pressure sensors and a plurality of position sensors based on the first preset interval, the second preset interval, and the third preset interval, and to set a plurality of strain gauges at corresponding central positions of the crown region, the waist region, and the bottom region and at interconnections of the crown region, the waist region, and the bottom region;

[0015] The first preset interval is smaller than the second preset interval and smaller than the third preset interval.

[0016] Furthermore, the pressure analysis module includes:

[0017] A single point analysis unit, used to draw an actual pressure change graph based on the real-time pressure values ​​corresponding to any one of the pressure sensors, mark a curve segment corresponding to a pressure greater than a preset water pressure threshold in the actual pressure change graph, compare the marked curve segment with a preset curve segment, determine whether the single point is abnormal based on the curve segment comparison result, or analyze whether the change trend of the marked curve segment is increasing to determine whether the single point is abnormal;

[0018] an abnormality determination unit connected to the single-point analysis unit, for determining that the segment pressure is abnormal when the number of abnormalities is greater than or equal to a preset number threshold, and for analyzing a change trend of the number of abnormalities when the number of abnormalities is less than the preset number threshold to determine whether the segment pressure is abnormal;

[0019] The frequency adjustment unit is connected to the abnormality determination unit and is used to increase the preset frequency when the abnormality quantity change trend does not increase.

[0020] Furthermore, the deformation analysis module includes:

[0021] A first instruction receiving unit, used for receiving the deformation analysis instruction;

[0022] A radial analysis unit, for drawing a displacement change curve based on a number of real-time positions, and determining a radial deformation degree based on the displacement change curve;

[0023] A circumferential analysis unit is used to convert the real-time resistance values ​​into real-time circumferential strain values ​​based on the resistance-strain characteristic equation of the strain gauge, draw a strain characteristic curve based on the real-time circumferential strain values, and determine the circumferential strain degree according to the strain characteristic curve;

[0024] A deformation analysis unit connected to the radial analysis unit and the circumferential analysis unit, for determining the deformation degree of the segment based on the radial deformation degree and the circumferential strain degree;

[0025] The threshold adjustment unit is connected to the deformation analysis unit and is used to adjust the preset water pressure threshold and generate a water release instruction based on the comparison result between the deformation degree of the pipe segment and the preset deformation degree.

[0026] Furthermore, the radial analysis unit comprises:

[0027] A single-point curve analysis subunit is used to obtain a number of real-time positions corresponding to any of the position sensors, draw a single-point displacement curve based on the number of real-time positions, analyze the real-time displacement deviation in the single-point displacement curve, compare it with a preset displacement deviation, and determine whether the single-point displacement is abnormal according to the comparison result, or analyze the change trend of the single-point displacement curve to determine whether the single-point displacement is abnormal according to the trend change analysis result;

[0028] An overall analysis subunit, connected to the single point curve analysis subunit, is used to determine the displacement anomaly distribution of a number of single point displacement anomalies and determine the displacement anomaly distribution density;

[0029] The radial extent determination subunit is connected to the overall analysis subunit and is used to determine the radial deformation extent based on the displacement abnormality distribution density.

[0030] Furthermore, the circumferential analysis unit includes:

[0031] The circumferential analysis subunit is used to draw a strain characteristic curve based on a number of real-time circumferential strain values, analyze the real-time strain deviation in the curve, compare it with the preset strain deviation, and determine whether the single-point strain is abnormal according to the comparison result, or analyze the change trend of the strain characteristic curve to determine whether the single-point strain is abnormal according to the trend change analysis result;

[0032] A strain analysis subunit, connected to the circumferential analysis subunit, for determining the strain anomaly distribution of a plurality of single-point strain anomalies and determining the strain anomaly distribution density;

[0033] The circumferential degree determination subunit is connected to the overall analysis subunit and is used to determine the circumferential strain degree based on the strain anomaly distribution density.

[0034] Furthermore, the threshold adjustment unit includes:

[0035] A comparison subunit is used to compare the deformation degree of the segment with a preset deformation degree to obtain a deformation degree comparison result;

[0036] A threshold adjustment subunit, connected to the comparison subunit, for reducing the preset water pressure threshold when the deformation degree of the pipe segment is greater than or equal to the preset deformation degree, and increasing the preset water pressure threshold when the deformation degree of the pipe segment is less than the preset deformation degree;

[0037] The instruction generation subunit is connected to the threshold adjustment subunit and is used to generate a water release instruction.

[0038] Furthermore, the drainage module comprises:

[0039] A second instruction receiving unit, used for receiving the water discharge instruction;

[0040] an opening quantity determining unit, connected to the second instruction receiving unit, for determining the opening quantity of the water inlet based on the difference between the adjusted preset water pressure threshold and the current water pressure value;

[0041] The opening distribution determination unit is connected to the opening quantity determination unit and is used to determine the opening distribution of the water intake based on the deformation distribution of the subway shield tunnel segment.

[0042] Furthermore, the opening quantity determination unit includes:

[0043] A difference calculation subunit, used to calculate the difference between the adjusted preset water pressure threshold and the current water pressure value;

[0044] The quantity determination subunit is connected to the difference calculation subunit and is used to determine the opening quantity of the water inlet based on the comparison result of the difference and the preset difference.

[0045] Further, the opening distribution determination unit includes:

[0046] A deformation analysis subunit, used to analyze deformation conditions corresponding to the arch crown area, the arch waist area and the arch bottom area respectively;

[0047] The distribution determination subunit is connected to the deformation analysis subunit, and is used to determine the opening distribution of the water inlet based on the corresponding deformation conditions of the arch crown area, the arch waist area and the arch bottom area.

[0048] Compared with the prior art, the beneficial effect of the present invention is that by setting the setting module, the structure of the subway shield tunnel segment can be accurately identified, the sensor layout can be carried out according to the characteristics of different areas, and the pressure sensors, position sensors and strain gauges can be reasonably set in the key stress-bearing and pressure-prone areas to ensure that the collected data is comprehensive and targeted, providing a basic guarantee for the subsequent accurate pressure and deformation analysis, effectively avoiding data omissions or deviations caused by unreasonable sensor layout, and improving the accuracy and reliability of the entire system monitoring. By setting the data acquisition module to collect various sensor data in real time based on a preset frequency, the status information of the segment at different times can be captured uninterruptedly, providing a data source for timely grasping the stress and deformation dynamics of the segment, which is helpful to be discovered when the pressure or deformation anomaly just occurs, avoiding delays in the detection and handling of potential safety hazards due to untimely data collection, and ensuring the safety and stability of tunnel operation. By setting the pressure analysis module to draw an actual pressure change graph and compare it with a preset water pressure threshold, the single point abnormality can be accurately located, the location and degree of the specific pressure anomaly can be clarified, and the pressure analysis module can be used to accurately detect the pressure change graph and compare it with the preset water pressure threshold. Through comprehensive analysis of multiple single-point abnormalities, the number of abnormalities and their changing trends are determined, which can not only determine whether the overall pressure of the current segment is abnormal, but also warn of the development trend of abnormal pressure in advance, flexibly adjust the preset frequency according to actual conditions, optimize the data acquisition strategy, and improve the system's response sensitivity to pressure changes. By setting the deformation analysis module to determine the radial deformation degree and the circumferential strain degree in combination with the real-time position and the resistance value, the overall deformation degree of the segment is obtained, which overcomes the limitations of the single deformation index evaluation and can more comprehensively and accurately reflect the true deformation state of the segment. After comparing the deformation degree of the segment with the preset deformation degree, the preset water pressure threshold is dynamically adjusted according to the result and a water discharge instruction is generated. When the deformation degree approaches or exceeds the safety range, the preset water pressure threshold is timely reduced and water discharge is started, which effectively prevents the segment from being damaged due to excessive deformation and ensures the integrity and durability of the tunnel structure. By setting the water discharge module to determine the opening number and distribution of the water intake according to the adjusted preset water pressure threshold and the deformation degree of the segment, the intelligent and precise water discharge operation is realized, and the safety and reliability of the subway shield tunnel segment are improved.

[0049] In particular, the structure identification unit accurately identifies the crown area, waist area and bottom area based on the preset installation state of the subway shield tunnel segment, so that the subsequent sensor settings can fully consider the stress characteristics and deformation law differences of different parts of the segment in the tunnel structure, lay a foundation for the reasonable layout of the sensors, and can more specifically collect data reflecting the status of key parts of the segment, thereby improving the accuracy and effectiveness of the entire monitoring system in assessing the health status of the segment structure. By setting the setting unit to arrange pressure sensors and position sensors at different preset intervals according to different characteristics of the crown, waist and bottom areas, it is avoided that resources are wasted due to excessive setting of sensors, and it is also prevented that key information is missed due to insufficient setting, thereby improving the monitoring efficiency of the sensor network. Strain gauges are set at the central positions and interconnections corresponding to the crown area, waist area and bottom area, so as to more accurately monitor the circumferential strain of the segment, deeply understand the stress distribution and deformation trend inside the segment, provide key data support for accurately evaluating the safety of the segment structure, help to discover the risks of cracks, damage and other diseases that may occur in the segment in advance, and ensure the safety of the subway shield tunnel segment.

[0050] In particular, by setting the single-point analysis unit to draw a graph of actual pressure changes and compare it with a preset water pressure threshold, the pressure change situation at the position monitored by the pressure sensor can be intuitively presented, the curve segment exceeding the threshold is marked and compared with the preset curve segment, or its change trend is analyzed to accurately determine whether a single pressure monitoring point has an abnormality. By setting the abnormality determination unit to integrate multiple single-point abnormalities, a judgment is made based on the comparison between the number of abnormalities and the preset number threshold. When the number of abnormalities reaches or exceeds the threshold, it can be quickly determined that the overall pressure of the segment is in an abnormal state, and comprehensive response measures can be taken in time. When the number of abnormalities does not reach the threshold, the change trend of the number of abnormalities is further analyzed to discover potential pressure abnormality development trends in advance, providing a basis for preventive maintenance and adjustment of monitoring strategies. By setting the frequency adjustment unit, when the change trend of the number of abnormalities does not increase, more detailed pressure change information can be obtained by increasing the data acquisition frequency, and the subtle characteristics of pressure fluctuations can be captured more accurately, which is helpful to further analyze the stability of abnormal pressure or potential change factors, and ensure the safety of subway shield tunnel segments. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 A structural block diagram of a subway shield tunnel segment external pressure control system based on automatic monitoring provided by an embodiment of the present invention;

[0052] Figure 2 A logic determination diagram for determining whether a point corresponding to any of the pressure sensors is abnormal at a single point in a pressure analysis module in an external pressure control system for a subway shield tunnel segment based on automatic monitoring provided in an embodiment of the present invention;

[0053] Figure 3 A logic determination diagram for determining whether the segment pressure is abnormal by a pressure analysis module in a subway shield tunnel segment external pressure control system based on automatic monitoring provided in an embodiment of the present invention;

[0054] Figure 4 A schematic structural diagram of a subway shield tunnel segment in a subway shield tunnel segment external pressure control system based on automatic monitoring provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0055] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0056] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0057] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0058] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] See also Figure 1 As shown, an embodiment of the present invention provides a subway shield tunnel segment external pressure control system based on automatic monitoring, the system comprising:

[0060] A setting module 10 is used to identify the structure of the subway shield tunnel segment, and to set a plurality of pressure sensors, a plurality of position sensors and a plurality of strain gauges on the subway shield tunnel segment according to the structure identification result;

[0061] A data acquisition module 20, connected to the setting module 10, for acquiring in real time, based on a preset frequency, a number of real-time pressure values ​​corresponding to any of the pressure sensors, a number of real-time positions corresponding to any of the position sensors, and a number of real-time resistance values ​​corresponding to any of the strain gauges;

[0062] The pressure analysis module 30 is connected to the data acquisition module 20, and is used to draw an actual pressure change graph according to a number of real-time pressure values ​​corresponding to any of the pressure sensors, analyze the actual pressure change graph based on a preset water pressure threshold to determine a single point abnormality, determine the number of abnormalities based on a number of single point abnormalities, compare the number of abnormalities with a preset number threshold, and determine the segment pressure abnormality based on the number comparison result, or, analyze the change trend of the abnormal number, and determine the segment pressure abnormality based on the change trend analysis result, or, adjust the preset frequency;

[0063] The deformation analysis module 40 is connected to the pressure analysis module 30, and is used to receive the deformation analysis instruction, determine the radial deformation degree based on the real-time positions, determine the hoop strain degree based on the real-time resistance values, determine the segment deformation degree based on the radial deformation degree and the hoop strain degree, and adjust the preset water pressure threshold based on the comparison result between the segment deformation degree and the preset deformation degree and generate a water release instruction;

[0064] The water discharge module 50 is connected to the deformation analysis module 40, and is used to receive the water discharge instruction, and determine the opening number and opening distribution of the water inlets on the subway shield tunnel segment based on adjusting the preset water pressure threshold and the deformation degree of the segment.

[0065] The subway shield tunnel segment external pressure control system based on automatic monitoring of the present invention can be applied to a protective structure composed of several subway shield tunnel segment structures, which can be connected to a building water meter to adjust the water pressure in the tunnel in real time to ensure the safety and stability of the water meter.

[0066] Specifically, the embodiment of the present invention accurately identifies the structure of the subway shield tunnel segment by setting the setting module, can arrange sensors according to the characteristics of different areas, and reasonably arrange pressure sensors, position sensors and strain gauges in key stress-bearing areas and areas prone to pressure changes, so as to ensure that the collected data is comprehensive and targeted, provide a basic guarantee for subsequent accurate pressure and deformation analysis, effectively avoid data omissions or deviations caused by unreasonable sensor layout, and improve the accuracy and reliability of the entire system monitoring. By setting the data acquisition module to collect various sensor data in real time based on a preset frequency, it can continuously capture the status information of the segment at different times, provide a data source for timely grasping the stress and deformation dynamics of the segment, and help to discover pressure or deformation anomalies as soon as they occur, avoid delays in the detection and handling of potential safety hazards due to untimely data collection, and ensure the safety and stability of tunnel operation. By setting the pressure analysis module to draw an actual pressure change graph and compare it with a preset water pressure threshold, the single point abnormality can be accurately located, and the location and degree of the specific pressure anomaly can be clarified. Comprehensive analysis of single-point abnormalities, determination of the number of abnormalities and their changing trends, can not only determine whether the current overall pressure of the segment is abnormal, but also give early warning of the development trend of pressure abnormalities, flexibly adjust the preset frequency according to actual conditions, optimize the data acquisition strategy, and improve the system's response sensitivity to pressure changes. By setting the deformation analysis module to determine the radial deformation degree and the circumferential strain degree in combination with the real-time position and the resistance value, the overall deformation degree of the segment is obtained, which overcomes the limitations of the single deformation index evaluation and can more comprehensively and accurately reflect the true deformation state of the segment. After comparing the deformation degree of the segment with the preset deformation degree, the preset water pressure threshold is dynamically adjusted according to the result and a water discharge instruction is generated. When the deformation degree approaches or exceeds the safety range, the preset water pressure threshold is timely reduced and water discharge is started, effectively preventing the segment from being damaged due to excessive deformation and ensuring the integrity and durability of the tunnel structure. By setting the water discharge module to determine the opening number and distribution of the water intake according to the adjusted preset water pressure threshold and the deformation degree of the segment, the intelligent and precise water discharge operation is realized, and the safety and reliability of the subway shield tunnel segment are improved.

[0067] Specifically, the setting module includes:

[0068] A structure identification unit, for identifying the corresponding vault area, waist area and bottom area of ​​any of the subway shield tunnel segments based on the preset installation state thereof;

[0069] a setting unit connected to the structure identification unit, configured to set a first preset interval, a second preset interval, and a third preset interval based on the crown region, the waist region, and the bottom region, to set a plurality of pressure sensors and a plurality of position sensors based on the first preset interval, the second preset interval, and the third preset interval, and to set a plurality of strain gauges at corresponding central positions of the crown region, the waist region, and the bottom region and at interconnections of the crown region, the waist region, and the bottom region;

[0070] The first preset interval is smaller than the second preset interval and smaller than the third preset interval.

[0071] Specifically, the embodiment of the present invention accurately identifies the crown area, waist area and bottom area of ​​the subway shield tunnel based on the preset installation state of the subway shield tunnel segment through the structure identification unit, so that the subsequent setting of sensors can fully consider the stress characteristics and deformation law differences of different parts of the segment in the tunnel structure, lay a foundation for the reasonable layout of sensors, and can more specifically collect data reflecting the status of key parts of the segment, thereby improving the accuracy and effectiveness of the whole monitoring system in assessing the health status of the segment structure. By setting the setting unit to arrange pressure sensors and position sensors at different preset intervals according to different characteristics of the crown, waist and bottom areas, it is avoided that excessive setting of sensors causes waste of resources, and it also prevents the omission of key information due to insufficient setting, thereby improving the monitoring efficiency of the sensor network. Strain gauges are set at the central positions and interconnections corresponding to the crown area, waist area and bottom area, so as to more accurately monitor the circumferential strain of the segment, deeply understand the stress distribution and deformation trend inside the segment, provide key data support for accurately evaluating the safety of the segment structure, help to discover the risks of cracks, damage and other diseases that may occur in the segment in advance, and ensure the safety of the subway shield tunnel segment.

[0072] It can be understood that in the embodiment of the present invention, the first preset interval is set in the arch top area, the second preset interval is set in the arch waist area, and the third preset interval is set in the arch bottom area.

[0073] It can be understood that the preset installation state described in the embodiment of the present invention is the specific position and direction of the subway shield tunnel segment in the tunnel annular structure, including its position relative to the tunnel axis, inclination angle, etc. On this basis, the arch area corresponding to the subway shield tunnel segment in the embodiment of the present invention is the top area of ​​the subway shield tunnel segment, which usually corresponds to the top of the tunnel, and is the main area in the tunnel structure that bears the pressure of the upper soil and groundwater. The arch waist area is the segment part located on both sides of the tunnel and connecting the arch crown and the arch bottom, which plays a role in supporting and stabilizing the tunnel structure, and is the part of the tunnel structure that bears the lateral soil and groundwater pressure. The arch bottom area is the bottom area of ​​the subway shield tunnel segment, which usually corresponds to the bottom of the tunnel, and is the part of the tunnel structure that bears the pressure of the lower soil and groundwater. Among them, the specific division of the arch crown area, the arch waist area and the arch bottom area can be achieved by analyzing the forces at various positions of the subway shield tunnel segment, and the area subjected to the pressure of the upper soil and groundwater is taken as the arch crown area, the area subjected to the pressure of the lower soil and groundwater is taken as the arch bottom area, and the remaining area is taken as the arch waist area.

[0074] It can be understood that the settings of the first preset interval, the second preset interval and the third preset interval in the embodiment of the present invention are determined according to different areas. Since the arch area bears the main pressure of the soil and groundwater above and is subjected to greater force, a denser sensor arrangement is required to capture subtle force changes. Therefore, the first preset interval should be relatively small. Although the arch waist area also bears a certain lateral pressure, its force is more dispersed compared to the arch area. Therefore, the second preset interval can be slightly larger. The arch bottom area is usually subjected to less force, but it still needs to be monitored to prevent abnormalities. Therefore, the third preset interval can be set to the maximum, where, for example, the first preset interval can be set to 1 / 20 of the circumference of the subway shield tunnel segment, the second preset interval can be set to 1 / 10 of the circumference of the subway shield tunnel segment, and the third preset interval can be set to 1 / 5 of the circumference of the subway shield tunnel segment.

[0075] It can be understood that the central position in the embodiment of the present invention can reflect the overall stress and deformation degree of the region, while the interconnections are often weak links due to geometric changes in the structure and the turning point of force transmission.

[0076] Specifically, the pressure analysis module includes:

[0077] A single point analysis unit, used to draw an actual pressure change graph based on the real-time pressure values ​​corresponding to any one of the pressure sensors, mark a curve segment corresponding to a pressure greater than a preset water pressure threshold in the actual pressure change graph, compare the marked curve segment with a preset curve segment, determine whether the single point is abnormal based on the curve segment comparison result, or analyze whether the change trend of the marked curve segment is increasing to determine whether the single point is abnormal;

[0078] an abnormality determination unit connected to the single-point analysis unit, for determining that the segment pressure is abnormal when the number of abnormalities is greater than or equal to a preset number threshold, and for analyzing a change trend of the number of abnormalities when the number of abnormalities is less than the preset number threshold to determine whether the segment pressure is abnormal;

[0079] The frequency adjustment unit is connected to the abnormality determination unit and is used to increase the preset frequency when the abnormality quantity change trend does not increase.

[0080] Please continue reading Figure 2 As shown, it is a logical determination diagram for the pressure analysis module of this embodiment to determine whether a point corresponding to any of the pressure sensors is a single point abnormality.

[0081] Please continue reading Figure 3 As shown, it is a logical determination diagram for the pressure analysis module of this embodiment to determine whether the segment pressure is abnormal.

[0082] Specifically, the embodiment of the present invention can intuitively present the pressure change situation of the position monitored by the pressure sensor by setting the single-point analysis unit to draw the actual pressure change graph and compare it with the preset water pressure threshold, mark the curve segment exceeding the threshold and compare it with the preset curve segment, or analyze its change trend, accurately determine whether there is an abnormality in a single pressure monitoring point, and set the abnormal determination unit to integrate multiple single-point abnormal situations, and make a judgment based on the comparison between the number of abnormalities and the preset number threshold. When the number of abnormalities reaches or exceeds the threshold, it can quickly determine that the overall pressure of the pipe segment is in an abnormal state, and take comprehensive response measures in time. When the number of abnormalities does not reach the threshold, the change trend of the number of abnormalities is further analyzed, and potential pressure abnormality development trends are discovered in advance, providing a basis for preventive maintenance and adjustment of monitoring strategies. By setting the frequency adjustment unit, when the change trend of the number of abnormalities does not increase, more detailed pressure change information is obtained by increasing the data acquisition frequency, and the subtle characteristics of pressure fluctuations are captured more accurately, which helps to further analyze the stability or potential change factors of abnormal pressure and ensure the safety of the subway shield tunnel segment.

[0083] It can be understood that the graphic analysis unit described in the embodiment of the present invention can determine that a single point is abnormal when the curve segment length corresponding to the marked curve segment is greater than or equal to the curve segment length corresponding to the preset curve segment. When the curve segment length corresponding to the marked curve segment is less than the curve segment length corresponding to the preset curve segment, the real-time length of the marked curve segment can be detected in real time, and a length change graph can be drawn according to several real-time lengths to analyze the length change trend of the marked curve segment. When the length change trend increases, the single point is determined to be abnormal, and when the length change trend decreases, the single point is determined to be normal. The changing trend of the curve can be determined by calculating the slope corresponding to two adjacent points on the curve. When the slope value is positive, the trend change increases. When the slope is negative, the trend change decreases. Judging the trend change of the curve is a prior art and will not be repeated here.

[0084] It can be understood that the abnormality determination unit described in the embodiment of the present invention is used to determine that the pipe segment pressure is abnormal when the number of abnormalities is greater than or equal to the preset number threshold, and when the number of abnormalities is less than the preset number threshold, continuously monitor and analyze the changing trend of the number of abnormalities corresponding to several single-point abnormalities over a period of time; when the number of abnormalities increases, the pipe segment pressure is determined to be abnormal; when the number of abnormalities does not increase, the preset frequency is increased to 1.5 times the preset frequency.

[0085] It can be understood that the preset quantity threshold in the embodiment of the present invention can be set to 10% of the total quantity corresponding to the plurality of pressure sensors.

[0086] See also Figure 4 As shown, the deformation analysis module 40 includes:

[0087] A first instruction receiving unit 41, used for receiving the deformation analysis instruction;

[0088] A radial analysis unit 42, for drawing a displacement change curve based on a number of real-time positions, and determining a radial deformation degree based on the displacement change curve;

[0089] A circumferential analysis unit 43 is used to convert the real-time resistance values ​​into real-time circumferential strain values ​​based on the resistance-strain characteristic equation of the strain gauge, draw a strain characteristic curve based on the real-time circumferential strain values, and determine the circumferential strain degree according to the strain characteristic curve;

[0090] A deformation analysis unit 44, connected to the radial analysis unit 42 and the circumferential analysis unit 43, for determining the deformation degree of the segment based on the radial deformation degree and the circumferential strain degree;

[0091] The threshold adjustment unit 45 is connected to the deformation analysis unit 44 and is used to adjust the preset water pressure threshold and generate a water release instruction based on the comparison result between the deformation degree of the pipe segment and the preset deformation degree.

[0092] Specifically, the embodiment of the present invention ensures that the module can accurately perform the predetermined analysis task by setting the instruction receiving unit, provides an intuitive understanding of the radial deformation of the segment by setting the radial analysis unit, and provides basic data for subsequent analysis, provides quantitative analysis of the circumferential strain of the segment by setting the circumferential analysis unit, and helps to understand the stress conditions of the segment in different directions, provides a comprehensive assessment of the overall deformation of the segment by setting the deformation analysis unit, and provides important information for the safety assessment of the subway shield tunnel segment, and dynamically adjusts the system control strategy by setting the threshold adjustment unit to ensure that the pressure outside the segment is within a safe range, thereby ensuring the safety of the subway shield tunnel segment.

[0093] It can be understood that the deformation analysis module 40 described in the embodiment of the present invention also includes: when the deformation degree of the pipe segment is greater than or equal to the preset deformation degree, reducing the preset water pressure threshold and generating a water discharge instruction; when the deformation degree of the pipe segment is less than the preset deformation degree, increasing the preset water pressure threshold.

[0094] It can be understood that the preset water pressure threshold described in the embodiment of the present invention is the maximum water pressure value that the subway shield tunnel segment can withstand under normal working conditions. This value is pre-set based on the tunnel design parameters and geological conditions. If the maximum water pressure value that a subway shield tunnel segment can withstand under normal working conditions is 0.8MPa, then the preset water pressure threshold can be set to 0.7MPa.

[0095] Specifically, the radial analysis unit includes:

[0096] A single-point curve analysis subunit is used to obtain a number of real-time positions corresponding to any of the position sensors, draw a single-point displacement curve based on the number of real-time positions, analyze the real-time displacement deviation in the single-point displacement curve, compare it with a preset displacement deviation, and determine whether the single-point displacement is abnormal according to the comparison result, or analyze the change trend of the single-point displacement curve to determine whether the single-point displacement is abnormal according to the trend change analysis result;

[0097] An overall analysis subunit, connected to the single point curve analysis subunit, is used to determine the displacement anomaly distribution of a number of single point displacement anomalies and determine the displacement anomaly distribution density;

[0098] The radial extent determination subunit is connected to the overall analysis subunit and is used to determine the radial deformation extent based on the displacement abnormality distribution density.

[0099] It can be understood that the single-point curve analysis subunit described in the embodiment of the present invention is used to determine the single-point displacement abnormality when the real-time displacement deviation is greater than or equal to the preset displacement deviation, and when the real-time displacement deviation is less than the preset displacement deviation, analyze the change trend of the single-point displacement curve, and when the corresponding change trend is rising, judge the single-point displacement abnormality.

[0100] It can be understood that the real-time displacement deviation of the embodiment of the present invention is the cumulative sum of the position differences between adjacent moments in the single-point displacement curve. For example, the displacement difference between moment 1 and moment 2 is 2mm, the displacement difference between moment 2 and moment 3 is 3mm, and the displacement difference between moment 3 and moment 4 is 4mm. The three position differences are added together: 2mm+3mm+4mm=9mm, and the cumulative sum of the real-time displacement deviation is 9mm, where adjacent moments refer to any two consecutive sampling points as adjacent moments.

[0101] It can be understood that the maximum deformation that the preset displacement deviation segment can withstand without structural damage in the embodiment of the present invention is usually determined by engineering standards and safety factors. If the maximum deformation that a subway shield tunnel segment can withstand without structural damage is 2mm, then the preset displacement deviation can be set to 1.5mm.

[0102] It can be understood that the overall analysis subunit of the embodiment of the present invention determines the abnormal displacement distribution density by drawing the distribution of abnormal displacement on the segment structure diagram according to the collected abnormal single-point displacement information to obtain the abnormal displacement distribution diagram, wherein the abnormal single-point displacement information may include the coordinates of the abnormal point, the position of the abnormal point, etc.;

[0103] According to the displacement anomaly distribution map, the displacement anomaly distribution density can be calculated by calculating the ratio of the area of ​​the anomaly region to the total area of ​​the monitoring area.

[0104] It can be understood that the embodiment of the present invention uses the abnormal displacement distribution density as a numerical value for quantitatively evaluating the degree of radial deformation.

[0105] Specifically, the circumferential analysis unit includes:

[0106] The circumferential analysis subunit is used to draw a strain characteristic curve based on a number of real-time circumferential strain values, analyze the real-time strain deviation in the curve, compare it with the preset strain deviation, and determine whether the single-point strain is abnormal according to the comparison result, or analyze the change trend of the strain characteristic curve to determine whether the single-point strain is abnormal according to the trend change analysis result;

[0107] A strain analysis subunit, connected to the circumferential analysis subunit, for determining the strain anomaly distribution of a plurality of single-point strain anomalies and determining the strain anomaly distribution density;

[0108] The circumferential degree determination subunit is connected to the overall analysis subunit and is used to determine the circumferential strain degree based on the strain anomaly distribution density.

[0109] It can be understood that, for the metal resistance strain gauge in the embodiment of the present invention, its resistance-strain characteristic equation can generally be expressed as: Among them, ΔR is the change in resistance, which is the initial resistance of the strain gauge when it is not strained, K is the sensitivity coefficient of the strain gauge (determined by the material and manufacturing process of the strain gauge, generally provided by the manufacturer), and ε is the strain value (including axial strain and lateral strain, etc., here we mainly focus on circumferential strain). After the strain gauge is pasted to the inner surface of the subway shield tunnel segment and the measurement circuit is connected, when the segment is not subjected to external water pressure (i.e., in a state of no strain), a high-precision resistance measuring instrument is used to measure the initial resistance value of the strain gauge and record it R. This initial resistance value is an important benchmark parameter for subsequent calculation of strain. The real-time resistance value R of the strain gauge during the process of the segment being subjected to water pressure is collected according to the preset frequency. t , then the resistance change ΔR=R t -R, substitute the measured ΔR, the known R and the sensitivity coefficient K of the strain gauge into the resistance-strain characteristic equation The hoop strain value, for example, if the sensitivity coefficient of the strain gauge is K = 2, the initial resistance R = 120Ω, and the real-time resistance value R collected at a certain moment t =120.24Ω, then ΔR = 0.24Ω, then the hoop strain value ε = 1000×10 -6 In the process of resistance-strain conversion, attention should also be paid to the influence of environmental factors such as temperature on the resistance value, which can be corrected by temperature compensation algorithm to ensure accurate hoop strain value.

[0110] It can be understood that the circumferential analysis subunit described in the embodiment of the present invention is used to determine the single-point strain anomaly when the real-time strain deviation is greater than or equal to the preset strain deviation, and when the real-time strain deviation is less than the preset strain deviation, analyze the change trend of the resistance-strain characteristic curve, and when the corresponding change trend is rising, judge the single-point strain anomaly.

[0111] It can be understood that the preset strain deviation described in the embodiment of the present invention must first consider the mechanical properties of the pipe segment material. For example, for a concrete pipe segment, its ultimate tensile strain is generally between 100 and 300 microstrains (με). In order to ensure the safety of the pipe segment structure, the preset strain deviation can be set to a certain proportion of the ultimate tensile strain (such as 30% to 50%). Assuming that the ultimate tensile strain of the concrete pipe segment is 200με, if it is set at 40%, the preset strain deviation can be 80με. When the strain is close to a certain proportion of the material's ultimate strain, the risk of damage to the pipe segment will increase significantly, and timely warning is required. The preset strain deviation can also be determined by combining engineering experience. The preset strain deviation is determined by analyzing and summarizing the pipe segment strain monitoring data in previous subway shield tunnel projects. If it is found in multiple similar projects that when the pipe segment strain deviation reaches a certain value, the probability of the pipe segment having defects (such as cracks, leakage, etc.) increases significantly, then this value can be used as a reference for the preset strain deviation. For example, statistics show that when the strain deviation reaches 60με, the probability of tiny cracks appearing in the pipe segment is about 10%. This value can be used as a reference value for the preset strain deviation.

[0112] It can be understood that the strain analysis subunit of the embodiment of the present invention determines the strain anomaly distribution density by drawing the distribution of displacement anomalies on the segment structure diagram according to the collected single-point strain anomaly information, wherein the single-point displacement anomaly information may include the coordinates of the abnormal point, the position of the abnormal point, etc.;

[0113] According to the displacement anomaly distribution map, the displacement anomaly distribution density can be calculated by calculating the ratio of the area of ​​the anomaly region to the total area of ​​the monitoring area.

[0114] It can be understood that the embodiment of the present invention uses the strain anomaly distribution density as a numerical value for quantitatively evaluating the degree of hoop strain.

[0115] Specifically, the threshold adjustment unit includes:

[0116] A comparison subunit is used to compare the deformation degree of the segment with a preset deformation degree to obtain a deformation degree comparison result;

[0117] A threshold adjustment subunit, connected to the comparison subunit, for reducing the preset water pressure threshold when the deformation degree of the pipe segment is greater than or equal to the preset deformation degree, and increasing the preset water pressure threshold when the deformation degree of the pipe segment is less than the preset deformation degree;

[0118] The instruction generation subunit is connected to the threshold adjustment subunit and is used to generate a water release instruction.

[0119] It can be understood that the threshold adjustment subunit described in the embodiment of the present invention adjusts the preset water pressure threshold according to the comparison result. When the deformation degree of the pipe segment is greater than or equal to the preset deformation degree, it means that the pipe segment may be subjected to excessive external water pressure or there are other unfavorable factors causing excessive deformation. In order to reduce the risk of further deformation of the pipe segment, it is necessary to reduce the preset water pressure threshold, so as to avoid the risk of deformation and damage of the pipe segment due to excessive setting of the water pressure threshold in the next cycle; when the deformation degree of the pipe segment is less than the preset deformation degree, it means that the pipe segment is in a safe state, and the preset water pressure threshold can be appropriately increased to improve the stability and reliability of the system and avoid frequent triggering of water discharge operations due to excessive sensitivity.

[0120] Specifically, the drainage module 50 includes:

[0121] A second instruction receiving unit, used for receiving the water discharge instruction;

[0122] an opening quantity determining unit, connected to the second instruction receiving unit, for determining the opening quantity of the water inlet based on the difference between the adjusted preset water pressure threshold and the current water pressure value;

[0123] The opening distribution determination unit is connected to the opening quantity determination unit and is used to determine the opening distribution of the water intake based on the deformation distribution of the subway shield tunnel segment.

[0124] See also Figure 4 As shown, it is a possible structural schematic diagram of the subway shield tunnel segment according to an embodiment of the present invention. In the figure, 1, shield segment; 2, stress sheet; 3, water storage tank; 4, water inlet; 5, pressure sensor; 6, position sensor. When the pressure analysis module and the deformation analysis module determine that the pressure and deformation of the shield segment are abnormal, the water inlet 4 is opened, and water flows into the interior of the water storage tank 3 through the water inlet 4 to prevent further liquefaction of the soil and damage to the shield segment.

[0125] It can be understood that the opening number determination unit described in the embodiment of the present invention determines the number of water inlets to be opened according to the difference between the adjusted preset water pressure threshold and the current water pressure value. When the difference is large, it means that the water pressure outside the pipe segment needs to be quickly reduced, and more water inlets should be opened at this time; when the difference is small, it means that the water pressure is close to or slightly lower than the preset water pressure threshold, and fewer water inlets can be opened at this time or the current state can be maintained for observation.

[0126] It can be understood that the opening distribution determination unit described in the embodiment of the present invention determines the opening distribution of the water inlets according to the deformation distribution of the subway shield tunnel segment. If the deformation is mainly concentrated in a certain area, then more water inlets should be opened near the area to more effectively reduce the water pressure in the area; if the deformation distribution is relatively uniform, the water inlets can be opened relatively uniformly.

[0127] Specifically, the opening quantity determination unit includes:

[0128] A difference calculation subunit, used to calculate the difference between the adjusted preset water pressure threshold and the current water pressure value;

[0129] The quantity determination subunit is connected to the difference calculation subunit and is used to determine the opening quantity of the water inlet based on the comparison result of the difference and the preset difference.

[0130] It can be understood that the difference calculation subunit described in the embodiment of the present invention calculates the difference between the adjusted preset water pressure threshold and the current water pressure value. This difference reflects the gap between the current water pressure and the expected water pressure and is an important basis for determining the number of water inlets to be opened.

[0131] It can be understood that the quantity determination subunit described in the embodiment of the present invention increases the number of preset openings when the difference is greater than the preset difference, and decreases the number of preset openings when the difference is less than the preset difference. When the difference is greater than the preset difference, it means that the current water pressure exceeds the expected water pressure to a serious extent. At this time, it is necessary to increase the number of preset openings to speed up the water discharge speed and quickly reduce the water pressure outside the pipe segment. For example, if the number of preset openings is originally set to 3, when the difference is greater than the preset difference, it may be increased to 5 or even more. The specific adjustment range can be further refined and determined according to the size of the difference. The larger the difference, the more the number of openings is increased to enhance the water discharge capacity and return the water pressure to a safe range as soon as possible. On the contrary, when the difference is less than the preset difference, it indicates that although the current water pressure is higher than the preset water pressure threshold, the degree of deviation is small. At this time, appropriately reducing the number of preset openings can not only achieve slow water discharge, avoid problems such as instability of the surrounding formation caused by excessive water discharge, but also maintain the stability of water pressure to a certain extent, and prevent new safety hazards caused by excessive water discharge. For example, if the original preset number of openings is 4, when the difference is less than the preset difference, it can be reduced to 2. Through this refined control, the water pressure outside the segment can be smoothly adjusted to close to or equal to the preset water pressure threshold, ensuring that the tunnel is in a safe and stable operation state. At the same time, it also improves the intelligence and automation level of the entire water discharge control system, and reduces the frequency and uncertainty of human intervention; among them, the preset difference can be set to 1 / 100 of the preset water pressure threshold, and the preset number of openings can be set to 1 / 10 of the total number of water inlets.

[0132] It is understandable that the quantity determination subunit of the embodiment of the present invention may need to follow certain strategies when adjusting the number of openings of the water inlets, such as gradually increasing or decreasing the number of openings to avoid a sharp change in water pressure.

[0133] Specifically, the opening distribution determination unit includes:

[0134] A deformation analysis subunit, used to analyze deformation conditions corresponding to the arch crown area, the arch waist area and the arch bottom area respectively;

[0135] The distribution determination subunit is connected to the deformation analysis subunit, and is used to determine the opening distribution of the water inlet based on the corresponding deformation conditions of the arch crown area, the arch waist area and the arch bottom area.

[0136] It is understandable that the distribution determination subunit described in the embodiment of the present invention determines the opening distribution of the water inlet according to the deformation of each monitoring area. If the deformation of a certain monitoring area is large, it means that the water pressure in the area may be high, and more water inlets need to be opened to reduce the water pressure; if the deformation is small, fewer water inlets can be opened or kept closed. In this way, the precise control of the opening distribution of the water inlet can be achieved, thereby more effectively reducing the water pressure outside the pipe segment.

[0137] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0138] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A subway shield tunnel segment external pressure control system based on automatic monitoring, characterized in that: include: A setting module is used to identify the structure of the subway shield tunnel segment, so as to set a plurality of pressure sensors, a plurality of position sensors and a plurality of strain gauges on the subway shield tunnel segment according to the structure identification result; A data acquisition module, connected to the setting module, for acquiring a number of real-time pressure values ​​corresponding to any of the pressure sensors, a number of real-time positions corresponding to any of the position sensors, and a number of real-time resistance values ​​corresponding to any of the strain gauges in real time based on a preset frequency; A pressure analysis module, connected to the data acquisition module, for drawing an actual pressure change graph according to a number of real-time pressure values ​​corresponding to any of the pressure sensors, analyzing the actual pressure change graph based on a preset water pressure threshold to determine a single-point abnormality, determining the number of abnormalities based on a number of single-point abnormalities, comparing the number of abnormalities with a preset number threshold, judging the segment pressure abnormality based on the number comparison result, or, analyzing the change trend of the number of abnormalities, judging the segment pressure abnormality based on the change trend analysis result, or, adjusting the preset frequency; a deformation analysis module connected to the pressure analysis module, configured to receive the deformation analysis instruction, determine the radial deformation degree based on the plurality of real-time positions, determine the hoop strain degree based on the plurality of real-time resistance values, determine the segment deformation degree based on the radial deformation degree and the hoop strain degree, adjust the preset water pressure threshold value based on the comparison result between the segment deformation degree and the preset deformation degree, and generate a water release instruction; The water discharge module is connected to the deformation analysis module, and is used to receive the water discharge instruction, and determine the opening number and opening distribution of the water inlets on the subway shield tunnel segment based on adjusting the preset water pressure threshold and the deformation degree of the segment.

2. The subway shield tunnel segment external pressure control system based on automatic monitoring according to claim 1 is characterized in that: The setting module includes: A structure identification unit, for identifying the corresponding vault area, waist area and bottom area of ​​any of the subway shield tunnel segments based on the preset installation state thereof; a setting unit connected to the structure identification unit, configured to set a first preset interval, a second preset interval, and a third preset interval based on the crown region, the waist region, and the bottom region, to set a plurality of pressure sensors and a plurality of position sensors based on the first preset interval, the second preset interval, and the third preset interval, and to set a plurality of strain gauges at corresponding central positions of the crown region, the waist region, and the bottom region and at interconnections of the crown region, the waist region, and the bottom region; The first preset interval is smaller than the second preset interval and smaller than the third preset interval.

3. The subway shield tunnel segment external pressure control system based on automatic monitoring according to claim 2 is characterized in that: The pressure analysis module includes: A single point analysis unit, used to draw an actual pressure change graph based on the real-time pressure values ​​corresponding to any one of the pressure sensors, mark a curve segment corresponding to a pressure greater than a preset water pressure threshold in the actual pressure change graph, compare the marked curve segment with a preset curve segment, determine whether the single point is abnormal based on the curve segment comparison result, or analyze whether the change trend of the marked curve segment is increasing to determine whether the single point is abnormal; an abnormality determination unit connected to the single-point analysis unit, for determining that the segment pressure is abnormal when the number of abnormalities is greater than or equal to a preset number threshold, and for analyzing a change trend of the number of abnormalities when the number of abnormalities is less than the preset number threshold to determine whether the segment pressure is abnormal; The frequency adjustment unit is connected to the abnormality determination unit and is used to increase the preset frequency when the abnormality quantity change trend does not increase.

4. The subway shield tunnel segment external pressure control system based on automatic monitoring according to claim 3 is characterized in that: The deformation analysis module includes: A first instruction receiving unit, used for receiving the deformation analysis instruction; A radial analysis unit, used for drawing a displacement change curve based on a number of real-time positions, and determining a radial deformation degree based on the displacement change curve; A circumferential analysis unit is used to convert the real-time resistance values ​​into real-time circumferential strain values ​​based on the resistance-strain characteristic equation of the strain gauge, draw a strain characteristic curve based on the real-time circumferential strain values, and determine the circumferential strain degree according to the strain characteristic curve; A deformation analysis unit connected to the radial analysis unit and the circumferential analysis unit, for determining the deformation degree of the segment based on the radial deformation degree and the circumferential strain degree; The threshold adjustment unit is connected to the deformation analysis unit and is used to adjust the preset water pressure threshold and generate a water release instruction based on the comparison result between the deformation degree of the pipe segment and the preset deformation degree.

5. The subway shield tunnel segment external pressure control system based on automatic monitoring according to claim 4 is characterized in that: The radial analysis unit comprises: A single-point curve analysis subunit is used to obtain a number of real-time positions corresponding to any of the position sensors, draw a single-point displacement curve based on the number of real-time positions, analyze the real-time displacement deviation in the single-point displacement curve, compare it with a preset displacement deviation, and determine whether the single-point displacement is abnormal according to the comparison result, or analyze the change trend of the single-point displacement curve to determine whether the single-point displacement is abnormal according to the trend change analysis result; An overall analysis subunit, connected to the single point curve analysis subunit, is used to determine the displacement anomaly distribution of a number of single point displacement anomalies and determine the displacement anomaly distribution density; The radial extent determination subunit is connected to the overall analysis subunit and is used to determine the radial deformation extent based on the displacement abnormality distribution density.

6. The subway shield tunnel segment external pressure control system based on automatic monitoring according to claim 5 is characterized in that: The circumferential analysis unit comprises: The circumferential analysis subunit is used to draw a strain characteristic curve based on a number of real-time circumferential strain values, analyze the real-time strain deviation in the curve, compare it with the preset strain deviation, and determine whether the single-point strain is abnormal according to the comparison result, or analyze the change trend of the strain characteristic curve to determine whether the single-point strain is abnormal according to the trend change analysis result; A strain analysis subunit, connected to the circumferential analysis subunit, for determining the strain anomaly distribution of a plurality of single-point strain anomalies and determining the strain anomaly distribution density; The circumferential degree determination subunit is connected to the overall analysis subunit and is used to determine the circumferential strain degree based on the strain anomaly distribution density.

7. The subway shield tunnel segment external pressure control system based on automatic monitoring according to claim 6 is characterized in that: The threshold adjustment unit comprises: A comparison subunit is used to compare the deformation degree of the segment with a preset deformation degree to obtain a deformation degree comparison result; A threshold adjustment subunit, connected to the comparison subunit, for reducing the preset water pressure threshold when the deformation degree of the pipe segment is greater than or equal to the preset deformation degree, and increasing the preset water pressure threshold when the deformation degree of the pipe segment is less than the preset deformation degree; The instruction generation subunit is connected to the threshold adjustment subunit and is used to generate a water release instruction.

8. The subway shield tunnel segment external pressure control system based on automatic monitoring according to claim 7 is characterized in that: The drainage module comprises: A second instruction receiving unit, used for receiving the water discharge instruction; an opening quantity determining unit, connected to the second instruction receiving unit, for determining the opening quantity of the water inlet based on the difference between the adjusted preset water pressure threshold and the current water pressure value; The opening distribution determination unit is connected to the opening quantity determination unit and is used to determine the opening distribution of the water intake based on the deformation distribution of the subway shield tunnel segment.

9. The subway shield tunnel segment external pressure control system based on automatic monitoring according to claim 8 is characterized in that: The opening quantity determination unit comprises: A difference calculation subunit, used to calculate the difference between the adjusted preset water pressure threshold and the current water pressure value; The quantity determination subunit is connected to the difference calculation subunit and is used to determine the opening quantity of the water inlet based on the comparison result of the difference and the preset difference.

10. The subway shield tunnel segment external pressure control system based on automatic monitoring according to claim 9 is characterized in that: The opening distribution determining unit comprises: A deformation analysis subunit, used to analyze deformation conditions corresponding to the arch crown area, the arch waist area and the arch bottom area respectively; The distribution determination subunit is connected to the deformation analysis subunit, and is used to determine the opening distribution of the water inlet based on the corresponding deformation conditions of the arch crown area, the arch waist area and the arch bottom area.

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