Real-time visual early warning method for risks in construction process of subway station

Abstract

The invention relates to the technical field of real-time early warning of risks in the construction process of a subway station, and particularly discloses a real-time visual early warning method for the risks in the construction process of the subway station. The hydrological monitoring data is transmitted to a ground control center through a wireless communication network; processing the hydrological monitoring data of the current subway tunnel construction stage, comprehensively analyzing a possible coefficient of occurrence of a water burst event of the current subway tunnel construction stage, and sending a water burst analysis early warning signal; after the water gushing analysis early warning signal is received, the water gushing early warning risk level of the current subway tunnel construction stage is evaluated, and corresponding processing is carried out; the predicted tunnel water inflow of the subway tunnel in the future period is synchronously predicted, and timely early warning processing operation is carried out; the risk control in the construction process is ensured to be within an acceptable range, and scientific risk assessment and prevention measures are provided for tunnel construction.

Description

Technical Field

[0001] The invention belongs to the technical field of real-time early warning of risks in a subway station construction process, and relates to a real-time visual early warning method for risks in a subway station construction process. Background Art

[0002] With the development of my country's economy and the acceleration of urbanization, the urban population density is increasing. In order to ease the pressure of urban traffic, the construction of subway tunnels has become an important way to solve urban traffic problems. However, groundwater has a great impact on subway tunnel projects, and the construction of subway tunnels has high requirements for groundwater. First, a large amount of groundwater will be generated during the construction of the tunnel; secondly, when the groundwater level is shallow, pressurized water will be generated; finally, under special geological conditions, adverse geological phenomena such as water inrush, sand gushing, and mud gushing may occur. These are the important reasons why groundwater affects subway tunnel projects.

[0003] The drainage of subway tunnel construction has disrupted the original groundwater balance. If no drainage control measures are taken, groundwater will continue to leak through the subway tunnel, causing a series of adverse effects such as groundwater level drop, surface subsidence, surface water depletion and water quality deterioration. Summary of the invention

[0004] In view of the above problems existing in the prior art, the present invention provides a real-time visual early warning method for risks in the construction process of a subway station, which is used to solve the above technical problems.

[0005] In order to achieve the above purpose and other purposes, the technical solution adopted by the present invention is as follows: On one hand, the present invention provides a real-time visual early warning method for risks in the construction process of a subway station, the method comprising the following steps: Collect hydrological monitoring data of the current subway tunnel construction phase through monitoring instruments, and transmit the hydrological monitoring data to the ground control center through a wireless communication network; The ground control center uses analytical technology to process the hydrological monitoring data of the current subway tunnel construction stage, comprehensively analyzes the possible coefficient of water inrush events during the current subway tunnel construction stage, and sends a water inrush analysis warning signal; After receiving the water inrush analysis warning signal, evaluate the water inrush warning risk level of the current subway tunnel construction stage and take corresponding measures; The expected water inflow in subway tunnels in the future period is simultaneously predicted, and timely early warning and processing operations are carried out. The future period is divided into the future dry season and the future precipitation period.

[0006] Optionally, the hydrological monitoring data of the current subway tunnel construction stage is specifically the groundwater level height of each subway tunnel construction area. , soil permeability and groundwater pressure , m is the number of each subway tunnel construction area, m=1,2,...M.

[0007] Optionally, the probability coefficient of water inrush during the current subway tunnel construction phase is analyzed. The specific analysis process is as follows: Get the unit weight of groundwater , calculate the water pressure in each subway tunnel construction area during the current subway tunnel construction phase ; According to the derived formula , derive the groundwater flow rate of each subway tunnel construction area during the current subway tunnel construction phase , and are the tunnel excavation cross-sectional area and hydraulic gradient of the mth subway tunnel construction area in the current subway tunnel construction phase, respectively; In summary, the possible assessment coefficients of the first water inrush in each subway tunnel construction area during the current subway tunnel construction phase are analyzed. ; and are the soil cohesion and soil internal friction angle of the mth subway tunnel construction area in the current subway tunnel construction stage.

[0008] Optionally, the possibility coefficient of water inrush incidents during the current subway tunnel construction phase is analyzed. The specific analysis process also includes the following steps: Get the maximum allowable water level height of each subway tunnel construction area during the current subway tunnel construction phase , Maximum allowable soil permeability and the maximum allowable water pressure ; Above , and are the soil overburden pressure, maximum allowable seepage flow and vertical effective stress of the m-th subway tunnel construction area in the current subway tunnel construction phase, SF is the preset safety factor, is the allowable stress of subway tunnel lining; Analysis of the possible evaluation coefficient of the second water inrush in each subway tunnel construction area during the current subway tunnel construction phase ; The first water inrush possibility assessment coefficient and the second water inrush possibility assessment coefficient of each subway tunnel construction area in the current subway tunnel construction stage are summed and divided by the term 2 to obtain the comprehensive water inrush possibility assessment coefficient of each subway tunnel construction area in the current subway tunnel construction stage; If the comprehensive water inrush possibility assessment coefficients of all subway tunnel construction areas in the current subway tunnel construction stage are less than or equal to the set water inrush possibility assessment threshold, the possibility coefficient of the water inrush event in the current subway tunnel construction stage is recorded as 0; if there is a subway tunnel construction area in the current subway tunnel construction stage whose comprehensive water inrush possibility assessment coefficient is greater than the set water inrush possibility assessment threshold, the possibility coefficient of the water inrush event in the current subway tunnel construction stage is recorded as 1, and a water inrush analysis warning signal is sent.

[0009] Optionally, evaluate the water inrush warning risk level during the current subway tunnel construction phase. The specific evaluation process is as follows: Obtain each subway tunnel construction area with a probability coefficient of 1 for water inrush events during the subway tunnel construction phase, abbreviate them as water inrush areas, and renumber them, sequentially numbered as 1, 2, ... d, ... D; Calculate the water inflow at the bottom of the foundation pit corresponding to each water inflow area , are the soil permeability and groundwater level of the d-th water-gushing area, respectively. are the bottom area of ​​the foundation pit in the dth water-gushing area, the length of the water-gushing path at the bottom of the foundation pit, and the excavation depth of the foundation pit; Calculate the water inflow volume of the foundation pit side wall corresponding to each water inflow area , are the seepage coefficient of the side wall of the foundation pit and the radius of the foundation pit in the dth water inflow area, and R is the groundwater recharge coefficient; Comprehensively calculate the predicted total water inflow of the foundation pit corresponding to each water inflow area .

[0010] Optionally, evaluate the water inrush warning risk level during the current subway tunnel construction phase. The specific evaluation process also includes: Define the total predicted water inflow volume in each water inflow area corresponding to the subway tunnel construction impact coefficient , are the surrounding rock permeability, surrounding rock pressure and surrounding rock strength of the d-th water-gushing area respectively; They represent the total construction tunnel length and total construction time of the subway tunnel up to the current time point respectively; They represent the predefined construction method influence coefficient, geological condition influence coefficient and construction management level influence coefficient respectively; Based on the predicted total water inflow of the foundation pit corresponding to each water inflow area and the predicted total water inflow of each water inflow area corresponding to the subway tunnel construction impact coefficient, the water inflow warning risk assessment coefficient of the current subway tunnel construction stage is comprehensively calculated. , YZ is the preset safety threshold used to standardize the risk level, is the calculation weight coefficient of the dth water inflow area; If the water inrush warning risk assessment coefficient of the current subway tunnel construction stage is less than or equal to the low risk preset value, the water inrush warning risk level of the current subway tunnel construction stage shall be recorded as low risk; if the water inrush warning risk assessment coefficient of the current subway tunnel construction stage is greater than the low risk preset value and the water inrush warning risk assessment coefficient is less than or equal to the medium risk preset value, the water inrush warning risk level of the current subway tunnel construction stage shall be recorded as medium risk; if the water inrush warning risk assessment coefficient of the current subway tunnel construction stage is greater than the medium risk preset value and the water inrush warning risk assessment coefficient is less than or equal to the high risk preset value, the water inrush warning risk level of the current subway tunnel construction stage shall be recorded as high risk; if the water inrush warning risk assessment coefficient of the current subway tunnel construction stage is greater than the extremely high risk preset value, the water inrush warning risk level of the current subway tunnel construction stage shall be recorded as extremely high risk.

[0011] Optionally, the expected water inflow of the subway tunnel in the future dry season is predicted. The specific prediction logic is: Obtain the geological structure model of subway tunnel construction and obtain the permeability coefficient of underground aquifers corresponding to the subway tunnel , permeable area and the flow path length , and simultaneously obtain the water level difference between the underground water level of each underground aquifer in the subway tunnel and the water level at the bottom of the tunnel ; f is the number of each underground aquifer, f=1,2,...E; Comprehensive analysis to obtain the expected water inflow of subway tunnels during the future dry season .

[0012] Optionally, the expected water inflow of the subway tunnel during the future rainfall period is predicted. The specific prediction logic is: Calculate the amount of surface water infiltration into subway tunnels due to rainfall during future rainfall periods , BH is the saturated hydraulic conductivity of subway tunnel soil, is the change in soil moisture content, They are the height of the moist front, the humidity of the moist front, and the area affected by rainfall; Comprehensive analysis to obtain the expected water inflow of subway tunnels during the future rainfall period .

[0013] As described above, the real-time visual early warning method for subway station construction process risks provided by the present invention has at least the following beneficial effects: The present invention provides a real-time visual early warning method for risks in the construction process of a subway station. The method collects hydrological monitoring data of the current subway tunnel construction stage through a monitoring instrument, and transmits the hydrological monitoring data to a ground control center through a wireless communication network; the hydrological monitoring data of the current subway tunnel construction stage is processed, the possible coefficient of water inrush events in the current subway tunnel construction stage is comprehensively analyzed, and a water inrush analysis early warning signal is sent; after receiving the water inrush analysis early warning signal, the water inrush early warning risk level of the current subway tunnel construction stage is evaluated, and corresponding processing is performed; the expected water inrush volume of the subway tunnel in the future period is simultaneously predicted, and timely early warning processing operations are performed. On the one hand, the comprehensive analysis of the hydrological monitoring data, the calculation of the possible coefficient of water inrush, and the sending of the early warning signal are helpful to predict the risk in advance, so that the engineering team can have enough time to evaluate the risk, adjust the construction plan, and take measures such as reinforcement and support, drainage and pressure reduction, so as to reduce the economic losses and construction delays caused by sudden water inrush; on the other hand, the water inrush risk level is evaluated and processed after receiving the early warning signal, so as to achieve hierarchical management of risks. Different levels of warning signals correspond to different response measures, which can ensure the rational allocation of resources and avoid waste of resources. At the same time, it ensures that the risks in the construction process are controlled within an acceptable range, providing scientific risk assessment and prevention measures for tunnel construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the connection of each step of the method of the present invention. DETAILED DESCRIPTION

[0016] The above contents in combination with the implementation of the present invention are merely examples and explanations of the concept of the present invention. The technical personnel in the relevant technical field may make various modifications or supplements to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

[0017] Example 1 See also Figure 1 As shown, a real-time visual early warning method for subway station construction process risks includes the following steps: Collect hydrological monitoring data of the current subway tunnel construction phase through monitoring instruments, and transmit the hydrological monitoring data to the ground control center through a wireless communication network; Based on the above scheme, the hydrological monitoring data of the current subway tunnel construction stage is specifically the groundwater level height of each subway tunnel construction area. , soil permeability and groundwater pressure , m is the number of each subway tunnel construction area, m=1,2,...M.

[0018] The ground control center uses analytical technology to process the hydrological monitoring data of the current subway tunnel construction stage, comprehensively analyzes the possible coefficient of water inrush events during the current subway tunnel construction stage, and sends a water inrush analysis warning signal; Based on the above scheme, the possible coefficient of water inrush in the current subway tunnel construction phase is analyzed. The specific analysis process is as follows: Get the unit weight of groundwater , calculate the water pressure in each subway tunnel construction area during the current subway tunnel construction phase , The value is 9.81kN / m3; According to the derived formula , derive the groundwater flow rate of each subway tunnel construction area during the current subway tunnel construction phase , and are the tunnel excavation cross-sectional area and hydraulic gradient of the mth subway tunnel construction area in the current subway tunnel construction phase, Specifically, it is calculated by taking the ratio of the groundwater level height in the mth subway tunnel construction area to the tunnel depth; In summary, the possible assessment coefficients of the first water inrush in each subway tunnel construction area during the current subway tunnel construction phase are analyzed. ; and are the soil cohesion and soil internal friction angle of the mth subway tunnel construction area in the current subway tunnel construction stage.

[0019] The height of the groundwater level and the rising water pressure directly affect the stress of the tunnel structure, while the soil permeability and groundwater flow rate reflect the penetration capacity and flow characteristics of groundwater through the soil. The shear strength and stability of the soil can be evaluated by combining the cohesion and internal friction angle of the soil. The physical mechanism of the interaction between groundwater and tunnel structure is combined with the actual measurement data and soil mechanical properties to evaluate the possibility of water inrush events.

[0020] Based on the above scheme, the possible coefficient of water inrush incident in the current subway tunnel construction stage is analyzed. The specific analysis process also includes the following steps: Get the maximum allowable water level height of each subway tunnel construction area during the current subway tunnel construction phase , Maximum allowable soil permeability and the maximum allowable water pressure ; Above , and are the soil overburden pressure, maximum allowable seepage flow and vertical effective stress of the m-th subway tunnel construction area in the current subway tunnel construction phase, SF is the preset safety factor, is the allowable stress of subway tunnel lining; Analysis of the possible evaluation coefficient of the second water inrush in each subway tunnel construction area during the current subway tunnel construction phase ; The first water inrush possibility assessment coefficient and the second water inrush possibility assessment coefficient of each subway tunnel construction area in the current subway tunnel construction stage are summed and divided by the term 2 to obtain the comprehensive water inrush possibility assessment coefficient of each subway tunnel construction area in the current subway tunnel construction stage; If the comprehensive water inrush possibility assessment coefficients of all subway tunnel construction areas in the current subway tunnel construction stage are less than or equal to the set water inrush possibility assessment threshold, the possibility coefficient of the water inrush event in the current subway tunnel construction stage is recorded as 0; if there is a subway tunnel construction area in the current subway tunnel construction stage whose comprehensive water inrush possibility assessment coefficient is greater than the set water inrush possibility assessment threshold, the possibility coefficient of the water inrush event in the current subway tunnel construction stage is recorded as 1, and a water inrush analysis warning signal is sent.

[0021] After receiving the water inrush analysis warning signal, evaluate the water inrush warning risk level of the current subway tunnel construction stage and take corresponding measures; Based on the above schemes, the water inrush warning risk level in the current subway tunnel construction phase is evaluated. The specific evaluation process is as follows: Obtain each subway tunnel construction area with a probability coefficient of 1 for water inrush events during the subway tunnel construction phase, abbreviate them as water inrush areas, and renumber them, sequentially numbered as 1, 2, ... d, ... D; Calculate the water inflow at the bottom of the foundation pit corresponding to each water inflow area , are the soil permeability and groundwater level of the d-th water-gushing area, respectively. are the bottom area of ​​the foundation pit in the dth water-gushing area, the length of the water-gushing path at the bottom of the foundation pit, and the excavation depth of the foundation pit; Calculate the water inflow volume of the foundation pit side wall corresponding to each water inflow area , are the seepage coefficient of the side wall of the foundation pit and the radius of the foundation pit in the dth water inflow area, and R is the groundwater recharge coefficient; The groundwater recharge coefficient refers to the ratio or efficiency of groundwater recharging to the underground aquifer through various channels (such as precipitation, surface water infiltration, etc.) in the water inflow area. This coefficient is very important when calculating the water inflow from the side wall of the foundation pit, because it directly affects the amount of water that needs to be treated during the foundation pit excavation process.

[0022] Specifically, the groundwater recharge coefficient can reflect the recharge capacity of the groundwater system, usually expressed as a dimensionless coefficient. The larger the coefficient, the stronger the recharge capacity of the groundwater system, and the water inflow from the side walls of the foundation pit will increase accordingly. Therefore, when calculating the water inflow from the side walls of the foundation pit, the groundwater recharge coefficient must be considered in order to accurately estimate the amount of water that needs to be removed and ensure the safety and efficiency of the foundation pit construction.

[0023] Comprehensively calculate the predicted total water inflow of the foundation pit corresponding to each water inflow area .

[0024] Based on the above schemes, the water inrush warning risk level of the current subway tunnel construction phase is evaluated. The specific evaluation process also includes: Define the total predicted water inflow volume in each water inflow area corresponding to the subway tunnel construction impact coefficient , are the surrounding rock permeability, surrounding rock pressure and surrounding rock strength of the d-th water-gushing area respectively; They represent the total construction tunnel length and total construction time of the subway tunnel up to the current time point respectively; They represent the predefined construction method influence coefficient, geological condition influence coefficient and construction management level influence coefficient respectively; In the above formula It indicates the water inflow per unit length and per unit time, reflecting the impact of water inflow on the construction progress; It indicates the ratio of surrounding rock permeability and pressure to surrounding rock strength, reflecting the stability of surrounding rock under water inrush conditions; It is the influence coefficient of the construction method. Different construction methods have different abilities to handle water inflow. It is the influence coefficient of geological conditions. The impact of water inflow on construction is different under different geological conditions. is the influence coefficient of construction management level. High-level construction management can effectively reduce the impact of water inflow on construction; Based on the predicted total water inflow of the foundation pit corresponding to each water inflow area and the predicted total water inflow of each water inflow area corresponding to the subway tunnel construction impact coefficient, the water inflow warning risk assessment coefficient of the current subway tunnel construction stage is comprehensively calculated. , YZ is the preset safety threshold used to standardize the risk level, is the calculation weight coefficient of the dth water inflow area; The calculation weight coefficient of each water-gushing area can be determined based on a combination of factors, including regional importance, geological conditions, construction difficulty, and historical water-gushing data; Regional importance: reflects the importance of the region in the entire project; geological conditions: reflects the geological complexity and water inrush risk of the region; construction difficulty: reflects the construction difficulty of the region; historical water inrush data: reflects the past water inrush situation of the region; Each factor can be assigned a weight. For example, the regional importance weight is 0.3, the geological condition weight is 0.3, the construction difficulty weight is 0.2, and the historical water inflow data weight is 0.2. For the dth water inflow area, assume that the scores of each factor are as follows Regional importance is 0.8 (full score is 1); geological conditions are 0.6 (full score is 1); construction difficulty is 0.7 (full score is 1); historical water inflow data is 0.9 (full score is 1); The calculation weight coefficient of each water-gushing area = 0.3*0.8+0.3*0.6+0.2*0.7+0.2*0.9=0.74.

[0025] If the water inrush warning risk assessment coefficient of the current subway tunnel construction stage is less than or equal to the low risk preset value, the water inrush warning risk level of the current subway tunnel construction stage shall be recorded as low risk; if the water inrush warning risk assessment coefficient of the current subway tunnel construction stage is greater than the low risk preset value and the water inrush warning risk assessment coefficient is less than or equal to the medium risk preset value, the water inrush warning risk level of the current subway tunnel construction stage shall be recorded as medium risk; if the water inrush warning risk assessment coefficient of the current subway tunnel construction stage is greater than the medium risk preset value and the water inrush warning risk assessment coefficient is less than or equal to the high risk preset value, the water inrush warning risk level of the current subway tunnel construction stage shall be recorded as high risk; if the water inrush warning risk assessment coefficient of the current subway tunnel construction stage is greater than the extremely high risk preset value, the water inrush warning risk level of the current subway tunnel construction stage shall be recorded as extremely high risk.

[0026] The expected water inflow in subway tunnels in the future period is simultaneously predicted, and timely early warning and processing operations are carried out. The future period is divided into the future dry season and the future precipitation period.

[0027] Based on the above schemes, the expected water inflow of subway tunnels in the future dry season is predicted. The specific prediction logic is as follows: Obtain the geological structure model of subway tunnel construction and obtain the permeability coefficient of underground aquifers corresponding to the subway tunnel , permeable area and the flow path length , and simultaneously obtain the water level difference between the underground water level of each underground aquifer in the subway tunnel and the water level at the bottom of the tunnel ; f is the number of each underground aquifer, f=1,2,...E; Comprehensive analysis to obtain the expected water inflow of subway tunnels during the future dry season .

[0028] Based on the above schemes, the expected water inflow of subway tunnels in the future rainfall period is predicted. The specific prediction logic is as follows: Calculate the amount of surface water infiltration into subway tunnels due to rainfall during future rainfall periods , BH is the saturated hydraulic conductivity of subway tunnel soil, is the change in soil moisture content, They are the height of the moist front, the humidity of the moist front, and the area affected by rainfall; The saturated hydraulic conductivity of soil can be obtained through soil penetration test.

[0029] The permeable area is determined based on the cross-section of the tunnel and the permeability of the surrounding soil.

[0030] The groundwater level difference and the length of the water flow path can be determined through hydrogeological surveys.

[0031] Soil moisture content change, wetting front height, and wetting front depth: determined by rainfall infiltration model and soil properties.

[0032] Comprehensive analysis to obtain the expected water inflow of subway tunnels during the future rainfall period .

[0033] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0034] It should be understood that determining B based on A does not mean determining B only based on A. B can also be determined based on A and / or other information.

[0035] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0036] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A real-time visual early warning method for risks in the construction process of a subway station, characterized in that: include: Collect hydrological monitoring data of the current subway tunnel construction phase through monitoring instruments, and transmit the hydrological monitoring data to the ground control center through a wireless communication network; The ground control center uses analytical technology to process the hydrological monitoring data of the current subway tunnel construction stage, comprehensively analyzes the possible coefficient of water inrush events during the current subway tunnel construction stage, and sends a water inrush analysis warning signal; After receiving the water inrush analysis warning signal, evaluate the water inrush warning risk level of the current subway tunnel construction stage and take corresponding measures; The expected water inflow in subway tunnels in the future period is simultaneously predicted, and timely early warning and processing operations are carried out. The future period is divided into the future dry season and the future precipitation period.

2. A real-time visual early warning method for subway station construction process risks according to claim 1, characterized in that: The hydrological monitoring data of the current subway tunnel construction phase specifically includes the groundwater level height of each subway tunnel construction area. , soil permeability and groundwater pressure , m is the number of each subway tunnel construction area, m=1,2,...M.

3. A real-time visual early warning method for subway station construction process risks according to claim 2, characterized in that: Analyze the possible coefficient of water inrush during the current subway tunnel construction phase. The specific analysis process is as follows: Get the unit weight of groundwater , calculate the water pressure in each subway tunnel construction area during the current subway tunnel construction phase ; According to the derived formula , derive the groundwater flow rate of each subway tunnel construction area during the current subway tunnel construction phase , and are the tunnel excavation cross-sectional area and hydraulic gradient of the mth subway tunnel construction area in the current subway tunnel construction phase, respectively; In summary, the possible assessment coefficients of the first water inrush in each subway tunnel construction area during the current subway tunnel construction phase are analyzed. ; and are the soil cohesion and soil internal friction angle of the mth subway tunnel construction area in the current subway tunnel construction stage.

4. A real-time visual early warning method for subway station construction process risks according to claim 3, characterized in that: Analyze the possible coefficient of water inrush during the current subway tunnel construction phase. The specific analysis process also includes the following steps: Get the maximum allowable water level height of each subway tunnel construction area during the current subway tunnel construction phase , Maximum allowable soil permeability and the maximum allowable water pressure ; Above , and are the soil overburden pressure, maximum allowable seepage flow and vertical effective stress of the m-th subway tunnel construction area in the current subway tunnel construction phase, SF is the preset safety factor, is the allowable stress of subway tunnel lining; Analysis of the possible evaluation coefficient of the second water inrush in each subway tunnel construction area during the current subway tunnel construction phase ; The first water inrush possibility assessment coefficient and the second water inrush possibility assessment coefficient of each subway tunnel construction area in the current subway tunnel construction stage are summed and divided by the term 2 to obtain the comprehensive water inrush possibility assessment coefficient of each subway tunnel construction area in the current subway tunnel construction stage; If the comprehensive water inrush possibility assessment coefficients of all subway tunnel construction areas in the current subway tunnel construction stage are less than or equal to the set water inrush possibility assessment threshold, the possibility coefficient of the water inrush event in the current subway tunnel construction stage is recorded as 0; if there is a subway tunnel construction area in the current subway tunnel construction stage whose comprehensive water inrush possibility assessment coefficient is greater than the set water inrush possibility assessment threshold, the possibility coefficient of the water inrush event in the current subway tunnel construction stage is recorded as 1, and a water inrush analysis warning signal is sent.

5. The method for real-time visual early warning of risks in the subway station construction process according to claim 1 is characterized in that: Evaluate the water inrush warning risk level during the current subway tunnel construction phase. The specific evaluation process is as follows: Obtain each subway tunnel construction area with a probability coefficient of 1 for water inrush events during the subway tunnel construction phase, abbreviate them as water inrush areas, and renumber them, sequentially numbered as 1, 2, ... d, ... D; Calculate the water inflow at the bottom of the foundation pit corresponding to each water inflow area , are the soil permeability and groundwater level of the d-th water-gushing area, respectively. are the bottom area of ​​the foundation pit in the dth water-gushing area, the length of the water-gushing path at the bottom of the foundation pit, and the excavation depth of the foundation pit; Calculate the water inflow volume of the foundation pit side wall corresponding to each water inflow area , are the seepage coefficient of the side wall of the foundation pit and the radius of the foundation pit in the dth water inrush area, and R is the groundwater recharge coefficient; Comprehensively calculate the predicted total water inflow of the foundation pit corresponding to each water inflow area .

6. A method for real-time visual early warning of risks in the construction process of a subway station according to claim 5, characterized in that: Assess the water inrush warning risk level during the current subway tunnel construction phase. The specific assessment process also includes: Define the total predicted water inflow volume in each water inflow area corresponding to the subway tunnel construction impact coefficient , are the surrounding rock permeability, surrounding rock pressure and surrounding rock strength of the d-th water-gushing area respectively; They represent the total construction tunnel length and total construction time of the subway tunnel up to the current time point respectively; They represent the predefined construction method influence coefficient, geological condition influence coefficient and construction management level influence coefficient respectively; Based on the predicted total water inflow of the foundation pit corresponding to each water inflow area and the predicted total water inflow of each water inflow area corresponding to the subway tunnel construction impact coefficient, the water inflow warning risk assessment coefficient of the current subway tunnel construction stage is comprehensively calculated. , YZ is the preset safety threshold used to standardize the risk level, is the calculation weight coefficient of the dth water inflow area; If the water inrush warning risk assessment coefficient of the current subway tunnel construction stage is less than or equal to the low risk preset value, the water inrush warning risk level of the current subway tunnel construction stage shall be recorded as low risk; if the water inrush warning risk assessment coefficient of the current subway tunnel construction stage is greater than the low risk preset value and the water inrush warning risk assessment coefficient is less than or equal to the medium risk preset value, the water inrush warning risk level of the current subway tunnel construction stage shall be recorded as medium risk; if the water inrush warning risk assessment coefficient of the current subway tunnel construction stage is greater than the medium risk preset value and the water inrush warning risk assessment coefficient is less than or equal to the high risk preset value, the water inrush warning risk level of the current subway tunnel construction stage shall be recorded as high risk; if the water inrush warning risk assessment coefficient of the current subway tunnel construction stage is greater than the extremely high risk preset value, the water inrush warning risk level of the current subway tunnel construction stage shall be recorded as extremely high risk.

7. The method for real-time visual early warning of risks in the construction process of a subway station according to claim 1 is characterized in that: Predict the expected water inflow of subway tunnels during the future dry season. The specific prediction logic is as follows: Obtain the geological structure model of subway tunnel construction and obtain the permeability coefficient of underground aquifers corresponding to the subway tunnel , permeable area and the flow path length , and simultaneously obtain the water level difference between the underground water level of each underground aquifer in the subway tunnel and the water level at the bottom of the tunnel ; f is the number of each underground aquifer, f=1,2,...E; Comprehensive analysis to obtain the expected water inflow of subway tunnels during the future dry season ; Calculate the amount of surface water infiltration into subway tunnels due to rainfall during future rainfall periods , BH is the saturated hydraulic conductivity of subway tunnel soil, is the change in soil moisture content, They are the height of the moist front, the humidity of the moist front, and the area affected by rainfall; Comprehensive analysis to obtain the expected water inflow of subway tunnels during the future rainfall period .

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