A three-dimensional geological modeling and stress analysis method and system based on comprehensive geophysical exploration

Abstract

The present invention relates to the technical field of three-dimensional modeling systems and modeling methods, and in particular to a three-dimensional geological modeling and stress analysis method and system based on comprehensive geophysical exploration. The method uses a comprehensive geophysical exploration method outside the tunnel to pick up data for three-dimensional modeling of poor geology before tunnel excavation in a poor geological area. The geophysical exploration data is used as the main data source to form a three-dimensional geological model before tunnel excavation. After tunnel excavation, the existing three-dimensional geological model is corrected according to the geological survey data and geophysical exploration data in the tunnel, and the three-dimensional geological model is refined and corrected. Three-dimensional visualization is performed on areas with serious poor geology. The data obtained by this model establishment method is more accurate and more referenceable. At the same time, the three-dimensional geological model is gridded and exported to a format recognizable by finite element software, and construction excavation stress analysis is performed to form various simulated excavation stress analysis diagrams. A data sharing module is also imported so that multiple participants can grasp the tunnel situation at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of three-dimensional modeling systems and modeling methods, and in particular to a three-dimensional geological modeling and force analysis method and system based on comprehensive geophysical exploration. Background Art

[0002] During tunnel construction, poor geological bodies are often encountered. Due to insufficient understanding of poor geological bodies, blind excavation leads to tunnel collapse, mud and water inrush and other disasters, causing safety of people's lives and property. At present, geological surveys, drilling, and surface geophysical exploration are carried out before tunnel construction, and advanced geological prediction in the tunnel is also carried out during tunnel construction, but the two are basically disconnected, with little mutual reference, and some even conflict, affecting the accuracy of geological prediction. In addition, due to the relatively single geophysical exploration method in the tunnel, it is difficult to determine the size of the poor geological body and its positional relationship with the tunnel, and the intuitiveness is poor. When constructing in areas with poor geological bodies, the methods selected are all overly conservative methods, and the construction risks in areas with poor geological bodies and the parts that need to be reinforced are also unknown. Summary of the invention

[0003] The purpose of the present invention is to address the technical defects that the location of unfavorable geological bodies is difficult to determine and lacks intuitiveness during tunnel construction in the prior art, the geophysical exploration, drilling and surface survey results of the prior art do not match the actual geological information, which reduces the accuracy of advance prediction, and the risk of unfavorable geological bodies and reinforcement methods are inaccurately judged during construction, resulting in slow construction progress, and unreasonable construction methods caused by risk prediction deviations, which in turn leads to safety hazards. A three-dimensional geological modeling and force analysis method based on comprehensive geophysical exploration is provided, which can increase the accuracy of three-dimensional geological modeling, visualize unfavorable geological bodies, determine the size of unfavorable geological bodies and their relative position to the tunnel, and analyze the risks of construction in unfavorable geological areas, providing a basis for construction force analysis diagrams and the like for construction plans.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A three-dimensional geological modeling and stress analysis method based on comprehensive geophysical exploration includes the following steps:

[0006] S1: Before the tunnel is excavated, the surface geophysical survey line is arranged along the tunnel direction, the geophysical data outside the tunnel are collected, and the three-dimensional geological preliminary model of the bad geological body is established with the geophysical data outside the tunnel; while conducting the surface geophysical survey of the tunnel, the hydrogeological survey outside the tunnel is carried out. After the surface geophysical survey and the hydrogeological survey are completed, the surface drilling and coring are carried out according to the abnormal section of the three-dimensional geological preliminary model of the bad geological body established with the geophysical data outside the tunnel, and the three-dimensional geological preliminary model of the bad geological body is corrected according to the surface drilling and coring results and the hydrogeological survey results, so as to form the three-dimensional geological initial model of the bad geological body;

[0007] S2: excavating the tunnel portal section, and collecting the sketch of the tunnel face and the geophysical exploration data in the tunnel as supplementary data to correct the preliminary model established in step S1; when excavating the tunnel portal section, based on the established three-dimensional geological initial model of the bad geological body and the exposed tunnel face, guiding the layout of the geophysical exploration lines in the tunnel, the layout of the advance drilling holes, verifying the accuracy of the established three-dimensional geological initial model of the bad geological body, and using the collected sketch of the tunnel face and the geophysical exploration drilling data in the tunnel as supplementary data to correct the three-dimensional geological initial model of the bad geological body established in step S1, to form a three-dimensional geological final model of the bad geological body.

[0008] S3: The three-dimensional geological modeling of the poor geological body is carried out using EVS and / or Voxler software, and the established three-dimensional geological model of the poor geological body can be refined and visualized;

[0009] S4: The final three-dimensional geological model of the poor geological body after refined modeling is meshed and exported to finite element software. By applying constraint conditions in the finite element software, various simulated excavation conditions of the tunnel in the poor geological body area are subjected to stress analysis to form a stress analysis diagram of tunnel excavation. The simulated excavation stress analysis technology uses finite element software to perform stress analysis on various tunnel simulated excavation conditions, and can perform stress analysis on different construction methods in the poor geological body area to find the optimal poor geological body treatment method. The geological model analyzed by the finite element software uses a meshed three-dimensional geological model exported by the three-dimensional geological modeling software to simulate various tunnel excavation conditions to form a stress analysis diagram of the tunnel.

[0010] S5: Feedback the visualization information of the three-dimensional geological model of the unfavorable geological body and the stress analysis diagram of the finite element analysis in step S4 to the data sharing module for information sharing among multiple parties.

[0011] In the technical solution of the present invention, before excavating a tunnel in a bad geological area, data is picked up by a comprehensive geophysical method outside the cave to perform three-dimensional modeling of bad geology, wherein the geophysical data is used as the main data source of the three-dimensional geological model, and a three-dimensional geological model before tunnel excavation is formed based on this. The data obtained by this model building method is more accurate and more referenceable. After tunnel excavation, the existing three-dimensional geological model is corrected according to the geological survey data and the geophysical data in the cave, and the three-dimensional geological model is refined and corrected. Three-dimensional visualization is performed on places with serious bad geology, and the three-dimensional geological model is gridded and exported into a format recognizable by finite element software, and construction excavation force analysis is performed to form each simulated excavation force diagram. The visualization model of the bad geological body and the simulated excavation force diagram are imported into the data sharing module, and the data sharing module integrates the three-dimensional visualization model of the bad geological body and the construction simulated excavation force diagram, and displays the relative relationship between each bad geological body and the tunnel and the excavation construction force analysis diagram. The data sharing module is used for data storage, transmission and sharing. The present invention can facilitate construction personnel to understand the position of bad geological bodies relative to the tunnel and the risks of construction in bad geological body areas, and it is convenient for all participants to understand the situation of bad geological bodies in the tunnel at all times. If major abnormal geology is found in the geophysical exploration in the tunnel and confirmed by drilling, all participants can click on the warning, and the data sharing module will automatically notify all participants in the form of text messages.

[0012] As a preferred technical solution of the present invention, in step S1, the geophysical data outside the tunnel are obtained according to the following method: according to the results of the geological survey and the direction of the tunnel, the surface geophysical survey lines are reasonably arranged along the tunnel line, and for the tunnel sections with shallow burial depths, the super digital DC electrical instrument WDA-1 is used to perform high-density electrical geophysical exploration on the tunnel surface; for the tunnel sections with deep burial depths, the Aether magnetotelluric system is used to perform magnetotelluric geophysical exploration on the tunnel surface; the geophysical data collected by the high-density electrical instrument or the magnetotelluric system are input into the EVS geological modeling software, and a preliminary three-dimensional geological model of the unfavorable geological body is obtained by screening and highlighting the low resistivity values.

[0013] Preferably, the geological survey data outside the cave is obtained by a penetration survey method and a tracing survey method, and the geological information includes topography, landform, stratum, lithology, structure, karst development, and water system distribution.

[0014] Further preferably, in S1, the outside-the-tunnel geophysical exploration data is screened and low resistivity values ​​are highlighted to obtain a three-dimensional preliminary geological model of the poor geological body. Specifically, the screening is performed according to the resistivity value of the surrounding rock in the tunnel site area. Usually, the apparent resistivity value is less than 100 to 1000 Ω·m, and is increased by 100 to obtain at least 10 three-dimensional preliminary geological models of poor geological bodies of different sizes.

[0015] As a preferred technical solution of the present invention, step S1 also includes the following contents: conducting a geological survey of the tunnel area, and recording the geological information of the area along the tunnel to form geological survey data outside the tunnel; and selecting at least two abnormal areas and at least two points as drilling points based on the three-dimensional geological preliminary model of the poor geological body, and collecting drilling data; correcting the three-dimensional geological preliminary model of the poor geological body based on the geological survey data outside the tunnel and the drilling data, screening and eliminating incorrect three-dimensional geological preliminary models of the poor geological body, and obtaining less than 10 revised versions of preliminary models of poor geological bodies of different sizes.

[0016] As a preferred technical solution of the present invention, in step S2, the in-hole geophysical data acquisition method includes any one or a combination of geological radar method, seismic wave method, and transient electromagnetic method.

[0017] As a preferred technical solution of the present invention, based on the three-dimensional geological initial model of the poor geological body and the exposed tunnel face, the arrangement of the geophysical detection lines in the tunnel and the arrangement of the advance drilling holes are guided. By interpreting the geophysical and drilling data in the cave, the accuracy of the established three-dimensional geological initial model of the poor geological body is verified. According to screening, some incorrect preliminary model revisions are eliminated to obtain a final version of the three-dimensional geological model of the poor geological body.

[0018] As a preferred technical solution of the present invention, in step S2, the revised model includes the size and location of medium and large-sized unfavorable geological bodies, and also includes adding small-sized unfavorable geological bodies into the three-dimensional geological model.

[0019] As a preferred technical solution of the present invention, in step S3, after refined modeling, the size of the poor geological body and the position relative to the tunnel can be clearly seen; the visualization is based on EVS and / or Voxler software, and uses the model area with better surrounding rock conditions to deemphasize the poor geological body area with poor surrounding rock conditions, and then adds coordinates and tunnel models to form a visualization model; the visualization model can highlight the size of the poor geological body of the tunnel and the position of the poor geological body relative to the tunnel.

[0020] As a preferred technical solution of the present invention, in step S2, the revised model includes the size and location of medium and large-sized unfavorable geological bodies, and also includes adding small-sized unfavorable geological bodies into the three-dimensional geological model.

[0021] As a preferred technical solution of the present invention, in step S3, after refined modeling, the size of the poor geological body and the position relative to the tunnel can be clearly seen; the visualization is based on EVS and / or Voxler software, and uses the model area with better surrounding rock conditions to deemphasize the poor geological body area with poor surrounding rock conditions, and then adds coordinates and tunnel models to form a visualization model; the visualization model can highlight the size of the poor geological body of the tunnel and the position of the poor geological body relative to the tunnel.

[0022] As the preferred technical solution of the present invention, the simulated excavation stress analysis technology uses finite element software to perform stress analysis on various conditions of tunnel simulation excavation. It can perform stress analysis on different construction methods in the area of ​​poor geological bodies to find the optimal method for treating poor geological bodies. The geological model analyzed by the finite element software uses a gridded three-dimensional geological model exported by three-dimensional geological modeling software to simulate various conditions of tunnel excavation. After adding constraints, a stress analysis diagram of the tunnel is formed.

[0023] As a preferred technical solution of the present invention, in step S5, the data sharing module imports the final version of the three-dimensional geological model of the unfavorable geological body and the stress analysis diagram of the simulated excavation of each working condition, and feeds back the visualization information of the geological model and the stress analysis diagram of the finite element analysis to the interface specified by the data sharing module, so that each participant can check it at any time to understand the situation of the unfavorable geological body and the excavation risk. If major abnormal geology is found in the geophysical verification in the cave, each participant can click on the warning, and the data sharing module will automatically notify each participant in the form of a text message.

[0024] A three-dimensional geological modeling and stress analysis system based on comprehensive geophysical exploration, the system specifically comprising:

[0025] Data acquisition module, data processing module, modeling module, finite element analysis module and data sharing module;

[0026] The data acquisition module is used to collect geophysical data, geological survey data and drilling data inside and outside the tunnel;

[0027] The data processing module is used to analyze and extract different types of data collected by the data acquisition module to form three-dimensional geological model modeling elements;

[0028] The modeling module uses the modeling elements formed by the data processing module to perform modeling to obtain a visualization model of the poor geological body of the tunnel;

[0029] The finite element analysis module imports the visualization model of the bad geological body obtained by the gridded modeling module, performs stress analysis of each simulated working condition of the bad geological body section, and obtains the tunnel stress analysis diagram of the bad geological body section.

[0030] The data sharing module imports the visualization model of the bad geological body established by the modeling module and the tunnel stress analysis diagram of the bad geological body section established by the finite element analysis module into the data sharing interface, so that all participants can understand the situation at any time.

[0031] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0032] 1. In the technical solution of the present invention, by modeling data from geophysical exploration, drilling, geological survey and other methods, the obtained three-dimensional geological model has high reliability and credibility, and the feedback information is more accurate.

[0033] 2. In the technical solution of the present invention, three-dimensional geological refined modeling technology is used to perform refined modeling of unfavorable geological bodies and visualization of unfavorable geological bodies, so that all participants can fully understand the size of the unfavorable geological bodies and their relationship with the tunnel.

[0034] 3. In the technical solution of the present invention, a three-dimensional geological modeling software is used to establish a model, and finite element software is imported to calculate the simulated construction stress conditions of each working condition, so that all participating parties can fully understand the risk level of construction in areas with poor geological bodies and fully understand the parts that need to be reinforced during construction.

[0035] 4. In the technical solution of the present application, based on comprehensive geophysical three-dimensional geological modeling and finite element stress analysis technology, the method is simple and easy to implement. After applying this method, the safety risks brought by construction in areas with poor geological bodies can be reduced, and the visualization of poor geological bodies in tunnels can be achieved. Data transmission and sharing can be carried out by wired or wireless means to ensure that all participants can always understand the poor geological bodies of the tunnel and the stress of tunnel excavation. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a system framework diagram of the present invention. DETAILED DESCRIPTION

[0037] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0038] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and 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.

[0039] Example 1

[0040] This embodiment specifically discloses a three-dimensional geological modeling and force analysis method based on comprehensive geophysical exploration. Specifically, Figure 1 Understanding includes the following steps:

[0041] S1: Before the tunnel is excavated, surface geophysical survey lines are arranged along the direction of the tunnel, and geophysical data outside the tunnel are collected, and a preliminary three-dimensional geological model of the poor geological body is established with the geophysical data outside the tunnel; specifically, the geophysical data outside the tunnel are obtained in the following manner: according to the results of the geological survey and the direction of the tunnel, surface geophysical survey lines are reasonably arranged along the tunnel line, and for tunnel sections with shallow burial depths, a super digital direct current electrical instrument WDA-1 is used to conduct high-density electrical geophysical exploration on the tunnel surface, and for tunnel sections with deep burial depths, an Aether magnetotelluric system is used to conduct magnetotelluric geophysical exploration on the tunnel surface, and the geophysical data collected by the high-density electrical instrument or the magnetotelluric system are input into the EVS geological modeling software, and a preliminary three-dimensional geological model of the poor geological body is obtained by screening and highlighting low resistivity values;

[0042] More specifically, the geophysical exploration data outside the cave are screened and low resistivity values ​​are highlighted to obtain a preliminary three-dimensional geological model of the unfavorable geological body. Specifically, the screening is performed according to the resistivity value of the surrounding rock in the tunnel site area. Usually, the apparent resistivity value is less than 100 to 1000 Ω·m, and the value is increased by 100 to obtain at least 10 preliminary three-dimensional geological models of unfavorable geological bodies of different sizes.

[0043] Further, the method includes revising the preliminary three-dimensional geological model of the poor geological body: specifically, the following contents are included: conducting geological surveys in the tunnel area, and recording geological information of the areas along the tunnel to form geological survey data outside the tunnel; and selecting at least two abnormal areas and at least two points as drilling points according to the preliminary three-dimensional geological model of the poor geological body, and collecting drilling data; revising the preliminary three-dimensional geological model of the poor geological body according to the geological survey data outside the tunnel and the drilling data, screening and eliminating incorrect preliminary three-dimensional geological models of the poor geological body, and obtaining less than 10 revised preliminary models of the poor geological body of different sizes; in step S2, the in-tunnel geophysical data acquisition method includes any one or a combination of geological radar method, seismic wave method, and transient electromagnetic method.

[0044] S2: Based on the three-dimensional geological initial model of the unfavorable geological body and the exposed tunnel face, guide the layout of the geophysical detection lines in the tunnel and the layout of the advance drilling holes. By interpreting the geophysical and drilling data in the cave, verify the accuracy of the established three-dimensional geological initial model of the unfavorable geological body. According to the screening, eliminate some incorrect preliminary model revisions to obtain the final three-dimensional geological model of the unfavorable geological body.

[0045] S3: The final version of the three-dimensional geological model of the bad geological body in step S2 is established by EVS and / or Voxler software, and the final version of the three-dimensional geological model of the bad geological body is finely modeled and visualized; in step S3, after fine modeling, the size of the bad geological body and its position relative to the tunnel can be clearly seen; and the model area with better surrounding rock conditions is downplayed, and the bad geological body area with poor surrounding rock conditions is highlighted, and then the coordinates and tunnel model are added to form a visualization model; the visualization model can highlight the size of the bad geological body of the tunnel and the position of the bad geological body relative to the tunnel.

[0046] S4: The final version of the three-dimensional geological model of the poor geological body after refined modeling is meshed and exported to the finite element software. By applying constraints in the finite element software, stress analysis is performed on various excavation conditions of the tunnel in the poor geological body area to form a stress analysis diagram of tunnel excavation. Specifically, the simulated excavation stress analysis technology uses finite element software to perform stress analysis on various conditions of tunnel simulation excavation. Stress analysis can be performed on different construction methods in the poor geological body area to find the optimal method for poor geological body management. The geological model analyzed by the finite element software uses a gridded three-dimensional geological model exported by the three-dimensional geological modeling software to simulate various conditions of tunnel excavation. After adding constraints, a stress analysis diagram of the tunnel is formed.

[0047] S5: Feedback the visualization information of the three-dimensional geological model of the unfavorable geological body and the stress analysis diagram of the finite element analysis in step S4 to the data sharing module for information sharing among multiple parties. The data sharing module imports the final version of the three-dimensional geological model of the unfavorable geological body and the stress analysis diagram of each working condition simulated excavation, and feeds back the visualization information of the geological model and the stress analysis diagram of the finite element analysis to the interface specified by the data sharing module, so that all participants can check it at any time to understand the situation of the unfavorable geological body and the excavation risk. If major abnormal geology is found in the geophysical verification in the cave, all participants can click on the warning, and the data sharing module will automatically notify all participants in the form of text messages.

[0048] In the technical solution of the present invention, before excavating a tunnel in a bad geological area, data is picked up by using a comprehensive geophysical method outside the cave to perform three-dimensional modeling of bad geology, wherein geophysical data is used as the main data source of the three-dimensional geological model, and drilling data and geological survey data outside the cave are used as constraints to correct the three-dimensional geological model, based on which a three-dimensional geological model before tunnel excavation is formed, and after tunnel excavation, the existing three-dimensional geological model is corrected according to the geological survey data and geophysical data inside the cave, and the three-dimensional geological model is refined and corrected, and three-dimensional visualization is performed on places with serious bad geology, and at the same time, the three-dimensional geological model is gridded and exported into a format recognizable by finite element software, and construction excavation force analysis is performed to form each simulated excavation force diagram. The visualization model of the bad geological body and the simulated excavation force diagram are imported into the data sharing module, and the data sharing module integrates the three-dimensional visualization model of the bad geological body and the construction simulated excavation force diagram, and displays the relative relationship between each bad geological body and the tunnel and the excavation construction force analysis diagram, and the data sharing module is used for data storage, transmission and sharing. The present invention can facilitate construction personnel to understand the position of bad geological bodies relative to the tunnel and the risks of construction in bad geological body areas, and it is convenient for all participants to understand the situation of bad geological bodies in the tunnel at all times. If major abnormal geology is found in the geophysical exploration in the tunnel and confirmed by drilling, all participants can click on the warning, and the data sharing module will automatically notify all participants in the form of text messages.

[0049] Example 2

[0050] A three-dimensional geological modeling and stress analysis system based on comprehensive geophysical exploration, the system specifically comprising:

[0051] Data acquisition module, data processing module, modeling module, finite element analysis module and data sharing module;

[0052] The data acquisition module is used to collect geophysical data, geological survey data and drilling data inside and outside the tunnel;

[0053] The data processing module is used to analyze and extract different types of data collected by the data acquisition module to form three-dimensional geological model modeling elements;

[0054] The modeling module uses the modeling elements formed by the data processing module to perform modeling to obtain a visualization model of the poor geological body of the tunnel;

[0055] The finite element analysis module imports the visualization model of the bad geological body obtained by the gridded modeling module, performs stress analysis of each simulated working condition of the bad geological body section, and obtains the tunnel stress analysis diagram of the bad geological body section.

[0056] The data sharing module imports the visualization model of the bad geological body established by the modeling module and the tunnel stress analysis diagram of the bad geological body section established by the finite element analysis module into the data sharing interface, so that all participants can understand the situation at any time.

[0057] The system of Example 2 is used to model and analyze the unfavorable geological body according to the modeling and force analysis method of the embodiment, and combined with the construction process of the tunnel, the geological conditions of the tunnel section can be obtained in time, and the best construction method can be known for construction work, making the construction more efficient and safer.

[0058] 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 and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A three-dimensional geological modeling and stress analysis method based on comprehensive geophysical exploration, characterized in that: The steps include: S1: Before tunnel excavation, surface geophysical survey lines are arranged along the tunnel direction, geophysical data outside the tunnel are collected, and a preliminary three-dimensional geological model of the unfavorable geological body is established using EVS and / or Voxer software based on the geophysical data outside the tunnel; In step S1, the geophysical data outside the tunnel are obtained in the following manner: according to the results of the geological survey and the direction of the tunnel, the surface geophysical survey line is reasonably arranged along the tunnel line, and for the tunnel section with a shallow burial depth, the super digital direct current electrical instrument WDA-1 is used to perform high-density electrical geophysical exploration on the tunnel surface, and for the tunnel section with a deep burial depth, the Aether magnetotelluric system is used to perform magnetotelluric geophysical exploration on the tunnel surface, and the geophysical data collected by the high-density electrical instrument or the magnetotelluric system are input into the EVS geological modeling software, and the preliminary three-dimensional geological model of the unfavorable geological body is obtained by screening and highlighting the low resistivity value; Specifically, the surrounding rock of the tunnel site is screened according to its resistivity value, and the apparent resistivity value is less than 100~1000Ω·m. 100 increments, to obtain at least 10 preliminary three-dimensional geological models of bad geological bodies of different sizes; Step S1 also includes the following contents: conducting a geological survey of the tunnel area, and recording geological information of the area along the tunnel to form geological survey data outside the tunnel; and selecting at least two abnormal areas according to the three-dimensional geological preliminary model of the bad geological body, selecting at least two points in each abnormal area as drilling points, and collecting drilling data; correcting the three-dimensional geological preliminary model of the bad geological body according to the geological survey data outside the tunnel and the drilling data, screening and eliminating incorrect three-dimensional geological preliminary models of the bad geological body, and obtaining less than 10 revised versions of preliminary models of bad geological bodies of different sizes; S2: excavating the tunnel portal section, collecting the sketch of the tunnel face and the geophysical data in the tunnel as supplementary data to correct the preliminary model established in step S1 to form a final version of the three-dimensional geological model of the poor geological body, and the final version of the three-dimensional geological model of the poor geological body is established by EVS and / or Voxler software; based on the three-dimensional geological preliminary model of the poor geological body and the exposed tunnel face, guiding the arrangement of the geophysical detection lines in the tunnel and the arrangement of the advance drilling holes, and verifying the accuracy of the established three-dimensional geological preliminary model of the poor geological body by interpreting the geophysical and drilling data in the tunnel, and eliminating some incorrect preliminary model revisions according to screening to obtain a final version of the three-dimensional geological model of the poor geological body; S3: Refining modeling and visualization of the final version of the three-dimensional geological model of the adverse geological body; S4: meshing the final version of the three-dimensional geological model of the poor geological body after refined modeling, and exporting it to finite element software, applying constraint conditions in the finite element software, performing stress analysis on various excavation conditions of tunnels in the poor geological body area, and forming a stress analysis diagram of tunnel excavation; S5: Feedback the visualization information of the three-dimensional geological model of the unfavorable geological body and the stress analysis diagram of the finite element analysis in step S4 to the data sharing module for information sharing among multiple parties.

2. The three-dimensional geological modeling and stress analysis method based on comprehensive geophysical exploration according to claim 1 is characterized in that: In step S2, the in-hole geophysical data acquisition method includes any one or a combination of geological radar method, seismic wave method, and transient electromagnetic method; correcting the preliminary model includes correcting the size and location of medium and large unfavorable geological bodies, and also includes adding small unfavorable geological bodies into the three-dimensional geological model.

3. The three-dimensional geological modeling and stress analysis method based on comprehensive geophysical exploration according to claim 1 is characterized in that: In step S3, after refined modeling, the size of the poor geological body and its position relative to the tunnel can be clearly seen; the visualization is based on EVS and / or Voxler software, and uses the model area with better surrounding rock conditions to deemphasize the poor geological body area with poor surrounding rock conditions, and then adds coordinates and tunnel models to form a visualization model; the visualization model can highlight the size of the poor geological body of the tunnel and the position of the poor geological body relative to the tunnel.

4. The three-dimensional geological modeling and stress analysis method based on comprehensive geophysical exploration according to claim 1 is characterized in that: In step S5, the data sharing module imports the final version of the three-dimensional geological model of the unfavorable geological body and the stress analysis diagram of the simulated excavation of each working condition, and feeds back the visualization information of the final version of the three-dimensional geological model of the unfavorable geological body and the stress analysis diagram of the finite element analysis to the interface specified by the data sharing module, so that all participants can check it at any time to understand the situation of the unfavorable geological body and the excavation risk. If major abnormal geology is found in the geophysical verification in the cave, all participants can click on the warning, and the data sharing module will automatically notify all participants in the form of text messages.

5. A three-dimensional geological modeling and stress analysis system based on comprehensive geophysical exploration, the system is used to execute the method according to any one of claims 1 to 4, characterized in that: The system specifically comprises: Data acquisition module, data processing module, modeling module, finite element analysis module and data sharing module; The data acquisition module is used to collect geophysical data, geological survey data and drilling data inside and outside the tunnel; The data processing module is used to analyze and extract different types of data collected by the data acquisition module to form three-dimensional geological model modeling elements; The modeling module uses the modeling elements formed by the data processing module to perform modeling to obtain a visualization model of the poor geological body of the tunnel; The finite element analysis module imports the visualization model of the bad geological body obtained by the gridded modeling module, performs stress analysis of each simulated working condition of the bad geological body section, and obtains the tunnel stress analysis diagram of the bad geological body section; The data sharing module imports the visualization model of the bad geological body established by the modeling module and the tunnel stress analysis diagram of the bad geological body section established by the finite element analysis module into the data sharing interface, so that all participants can understand the situation at any time.

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