CN116484670A - Three-dimensional geological modeling and stress analysis method and system based on comprehensive geophysical prospecting - Google Patents
Three-dimensional geological modeling and stress analysis method and system based on comprehensive geophysical prospecting Download PDFInfo
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- 238000004458 analytical method Methods 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 claims abstract description 58
- 238000009412 basement excavation Methods 0.000 claims abstract description 45
- 238000010276 construction Methods 0.000 claims abstract description 32
- 238000012800 visualization Methods 0.000 claims abstract description 26
- 238000012937 correction Methods 0.000 claims abstract description 14
- 238000005553 drilling Methods 0.000 claims description 28
- 238000011835 investigation Methods 0.000 claims description 17
- 230000000007 visual effect Effects 0.000 claims description 14
- 238000012216 screening Methods 0.000 claims description 13
- 238000010586 diagram Methods 0.000 claims description 12
- 239000011435 rock Substances 0.000 claims description 11
- 230000002159 abnormal effect Effects 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 9
- 238000009933 burial Methods 0.000 claims description 6
- 238000011033 desalting Methods 0.000 claims description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 3
- 238000012552 review Methods 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 3
- 230000001052 transient effect Effects 0.000 claims description 3
- 230000005641 tunneling Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 5
- 238000012790 confirmation Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
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- G—PHYSICS
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
- G06T17/20—Finite element generation, e.g. wire-frame surface description, tesselation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract
The invention relates to the technical field of three-dimensional modeling systems and modeling methods, in particular to a three-dimensional geological modeling and stress analysis method and system based on comprehensive geophysical prospecting. According to the method, data are picked up in an out-of-hole comprehensive geophysical prospecting mode before tunnel excavation in a poor geological area to conduct poor geological three-dimensional modeling, geophysical prospecting data serve as main data sources to form a three-dimensional geological model before tunnel excavation, after tunnel excavation, the existing three-dimensional geological model is corrected according to geological survey data in the tunnel and geophysical prospecting data in the tunnel, fine modeling correction is conducted on the three-dimensional geological model, three-dimensional visualization is conducted on places with serious poor geology, and data obtained in a model building mode are more accurate and have referential performance. Meanwhile, the three-dimensional geological model is led out to be in a format which can be identified by finite element software after being gridded, construction excavation stress analysis is carried out, and each simulated excavation stress analysis chart is formed. And the data sharing module is imported, so that multiple participants can master the tunnel condition at the same time.
Description
Technical Field
The invention relates to the technical field of three-dimensional modeling systems and modeling methods, in particular to a three-dimensional geological modeling and stress analysis method and system based on comprehensive geophysical prospecting.
Background
In the tunnel construction process, bad geologic bodies are frequently encountered, and due to insufficient knowledge of the bad geologic bodies, the tunnel is blindly excavated, so that disasters such as collapse, mud and water burst and the like occur, and the life and property safety of people is caused. At present, geological investigation, drilling and earth surface geophysical prospecting are carried out before tunnel construction, advanced geological prediction is carried out in a tunnel in the tunnel construction process, but the two are basically disjointed, have small mutual references, even have conflicts, influence the accuracy of geological prediction, and have poor intuitiveness because the geophysical prospecting means in the tunnel is single, the size of a bad geological body and the position relation between the bad geological body and the tunnel are difficult to judge. When the poor geologic body area is constructed, the method is too conservative, and the construction risk and the part needing reinforcement of the poor geologic body area are unknown.
Disclosure of Invention
The invention aims at: aiming at the defects that in the tunnel construction process in the prior art, the position of the bad geologic body is difficult to judge, the intuitiveness is lacking, and the geophysical prospecting, drilling and surface investigation results in the prior art are not matched with the actual geological information, so that the accuracy of advanced prediction is reduced, the risk of the bad geologic body and the judgment of a reinforcing method in the construction process are inaccurate, the construction progress is slow, the construction method caused by the risk pre-judging deviation is unreasonable, and the potential safety hazard is caused. The three-dimensional geological modeling and stress analysis method based on comprehensive geophysical prospecting is provided, the accuracy of the three-dimensional geological modeling can be improved through the method, visualization of the bad geological body is carried out, the size of the bad geological body and the position relation of the bad geological body relative to a tunnel can be determined, meanwhile, the construction risk of the bad geological region can be analyzed, and a construction stress analysis chart and other basis are provided for a construction scheme.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a three-dimensional geological modeling and stress analysis method based on comprehensive geophysical prospecting comprises the following steps:
s1: before a tunnel is dug, arranging the survey lines of earth surface geophysical prospecting along the trend of the tunnel, collecting the geophysical prospecting data outside the tunnel, and establishing a three-dimensional geological preliminary model of the poor geological body by using the geophysical prospecting data outside the tunnel; performing out-hole hydrogeological investigation while performing tunnel surface geophysical prospecting, performing surface drilling coring according to an abnormal section of the poor geological body three-dimensional geological preliminary model established by the data of the out-hole geophysical prospecting after the surface geophysical prospecting and the hydrogeological investigation are completed, and correcting the poor geological body three-dimensional geological preliminary model according to the surface drilling coring result and the hydrogeological investigation result to form a poor geological body three-dimensional geological preliminary model;
s2: excavating a tunnel portal section, and collecting in-tunnel face sketch and in-tunnel geophysical prospecting data as a primary model established in the supplementary data correction step S1; when the tunnel portal section is excavated, the arrangement of the physical detection lines in the tunnel is guided based on the established three-dimensional geological initial model of the bad geologic body and the tunnel face which is disclosed, the arrangement of the drilling holes is advanced, the accuracy of the established three-dimensional geological initial model of the bad geologic body is verified, and the three-dimensional geological final model of the bad geologic body is formed according to the acquired tunnel face sketch data in the tunnel and the physical detection drilling data in the tunnel as the supplementary data to correct the initial model of the three-dimensional geological initial model of the bad geologic body which is established in the step S1.
S3: the three-dimensional geological modeling of the bad geological body is performed by adopting EVS and/or Voxler software, and the established three-dimensional geological model of the bad geological body can be subjected to fine modeling and visualization;
s4: performing geological model meshing on the three-dimensional geological final model of the bad geological body after the fine modeling, exporting the model into finite element software, and performing stress analysis on various simulated excavation working conditions of the tunnel in the bad geological body region by applying constraint conditions in the finite element software to form a stress analysis graph of tunnel excavation; the simulated excavation stress analysis technology adopts finite element software to simulate each working condition of tunnel excavation to carry out stress analysis, can carry out stress analysis on construction of different methods of a bad geologic body area, finds out an optimal bad geologic body treatment method, adopts a gridding three-dimensional geologic model derived from three-dimensional geologic modeling software to simulate each working condition of tunnel excavation, and forms a stress analysis graph of the tunnel;
s5: and (3) feeding back the visual information of the poor geologic body three-dimensional geologic model in the step (S4) and the stress analysis graph of finite element analysis to a data sharing module for multiparty personnel information sharing.
According to the technical scheme, data are picked up in an out-of-hole comprehensive geophysical prospecting mode before tunnel excavation in a poor geological area to conduct poor geological three-dimensional modeling, geophysical prospecting data serve as main data sources of a three-dimensional geological model, a three-dimensional geological model before tunnel excavation is formed based on the data, the data obtained by the model establishment mode are more accurate and have more referential, after tunnel excavation, an existing three-dimensional geological model is corrected according to geological survey data in a hole and geophysical prospecting data in the hole, fine modeling correction is conducted on the three-dimensional geological model, three-dimensional visualization is conducted on a place with severe poor geology, and meanwhile the three-dimensional geological model is exported to be in a format identifiable by finite element software after being meshed, construction excavation stress analysis is conducted, and simulated excavation force diagrams are formed. And importing the bad geologic body visualization model and the simulated excavation force diagram into a data sharing module, integrating the bad geologic body three-dimensional visualization model and the construction simulated excavation force diagram by the data sharing module, displaying the relative relation between each bad geologic body and the tunnel and the excavation construction force analysis diagram, and storing, transmitting and sharing data by the data sharing module. The method and the system can facilitate constructors to know the position of the bad geologic body relative to the tunnel and the risk of construction of the bad geologic body area, and facilitate all parties to know the condition of the bad geologic body of the tunnel. If the geophysical prospecting in the hole has great abnormal geology, and after drilling confirmation, each participant can click on the early warning, and the data sharing module can automatically inform each participant in a short message mode.
As a preferred technical solution of the present invention, in step S1, the hole external geophysical prospecting data are obtained according to the following manner: according to the result of geological investigation and the trend of the tunnel, the survey lines of earth surface geophysical prospecting are reasonably arranged along the tunnel line, the super digital DC electric method instrument WDA-1 is adopted for carrying out high-density electromagnetic geophysical prospecting of the tunnel earth surface on the tunnel section with shallow burial depth, the Aether magnetotelluric system is adopted for carrying out magnetotelluric geophysical prospecting of the tunnel earth surface on the tunnel section with deep burial depth, geophysical prospecting data acquired by the high-density electric method instrument or the magnetotelluric system are input into EVS geological modeling software, and a three-dimensional geological preliminary model of the bad geological body is obtained through screening and highlighting low resistivity values.
Preferably, the out-hole geological survey data is obtained through a crossing survey method and a pursuit survey method, and the geological information comprises topography, landform, stratum, lithology, structure, karst development and water system distribution.
Further preferably, in the step S1, the hole external geophysical prospecting data is screened and low resistivity values are highlighted to obtain a three-dimensional geological preliminary model of the bad geological body, specifically, the screening is performed according to the resistivity values of surrounding rocks in a tunneling site area, the apparent resistivity value is generally selected to be smaller than 100-1000Ω·m, and 100 increases gradually to obtain the three-dimensional geological preliminary model of the bad geological body with different sizes of at least 10 parts of bad geological body.
As a preferred technical solution of the present invention, step S1 further includes the following: carrying out geological investigation of a tunnel region, and recording geological information of a region along the tunnel to form out-hole geological investigation data; selecting at least two abnormal areas according to the three-dimensional geological preliminary model of the bad geologic body, selecting at least two points as drilling points, and collecting drilling data; and correcting the three-dimensional geological preliminary model of the bad geologic body according to the out-hole geological survey data and the drilling data, screening and removing the incorrect three-dimensional geological preliminary model of the bad geologic body, and obtaining less than 10 parts of preliminary model correction versions with different sizes of the bad geologic body.
In the step S2, the method for acquiring geophysical prospecting data in a hole includes any one or a combination of several of a geological radar method, a seismic wave method and a transient electromagnetic method.
According to the optimal technical scheme, the method guides the arrangement of the geophysical survey lines in the tunnel and advances the arrangement of the drilling holes on the basis of the three-dimensional geological initial model of the bad geological body and the disclosed tunnel face, verifies the accuracy of the established three-dimensional geological initial model of the bad geological body by interpreting geophysical survey and drilling data in the holes, and eliminates partial incorrect initial model correction plates according to screening to obtain a final three-dimensional geological model final plate of the bad geological body.
In step S2, the correction model includes the size and the position of the large and medium-sized bad geologic bodies, and also includes adding small bad geologic bodies into the three-dimensional geologic model.
As the preferable technical scheme of the invention, in the step S3, after the fine modeling, the scale size of the bad geologic body and the position of the relative tunnel can be clearly seen; the visualization is based on EVS and/or Voxler software, a model area with better surrounding rock desalting conditions is adopted, a bad geological body area with worse surrounding rock is highlighted, and then a coordinate and tunnel model are added to form a visualization model; the visualization model can highlight the size of the tunnel bad geologic body and the position of the bad geologic body relative to the tunnel.
In step S2, the correction model includes the size and the position of the large and medium-sized bad geologic bodies, and also includes adding small bad geologic bodies into the three-dimensional geologic model.
As the preferable technical scheme of the invention, in the step S3, after the fine modeling, the scale size of the bad geologic body and the position of the relative tunnel can be clearly seen; the visualization is based on EVS and/or Voxler software, a model area with better surrounding rock desalting conditions is adopted, a bad geological body area with worse surrounding rock is highlighted, and then a coordinate and tunnel model are added to form a visualization model; the visualization model can highlight the size of the tunnel bad geologic body and the position of the bad geologic body relative to the tunnel.
As the preferable technical scheme of the invention, the simulated excavation stress analysis technology adopts finite element software to simulate each working condition of tunnel excavation to carry out stress analysis, can carry out stress analysis on construction of different methods of a bad geologic body area, find out the optimal bad geologic body treatment method, adopts a gridding three-dimensional geologic model derived by three-dimensional geologic modeling software to simulate each working condition of tunnel excavation, and forms a stress analysis chart of the tunnel after adding constraint conditions.
In step S5, the data sharing module feeds back the visual information of the geologic model and the stress analysis chart of finite element analysis to the interface specified by the data sharing module for each participant to review at any time, so as to know the condition of the bad geologic body and the excavation risk condition, if the physical prospecting verification in the hole shows serious abnormal geology, each participant can click and early warn, and the data sharing module can automatically inform each participant in a short message form.
A three-dimensional geologic modeling and stress analysis system based on comprehensive geophysical prospecting, the system comprising:
the system comprises a data acquisition module, a data processing module, a modeling module, a finite element analysis module and a data sharing module;
the data acquisition module is used for acquiring geophysical prospecting data, geological survey data and drilling data inside and outside the tunnel;
the data processing module is used for analyzing and extracting different types of data collected by the data acquisition module to form a three-dimensional geological model modeling element;
the modeling module performs modeling by using modeling elements formed by the data processing module to obtain a bad geological body visualization model of the tunnel;
and the finite element analysis module performs stress analysis of each simulation working condition of the bad geological body section through the bad geological body visual model obtained by the modeling module with the guided gridding so as to obtain a tunnel stress analysis chart of the bad geological body section.
The data sharing module is used for leading the bad geologic body visual model established by the modeling module and the tunnel stress analysis diagram of the bad geologic body section established by the finite element analysis module into a data sharing interface so as to enable each participant to know the situation at any time.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. according to the technical scheme, the three-dimensional geological model is obtained by modeling data in various modes such as geophysical prospecting, drilling, geological investigation and the like, the reliability and the reliability are high, and the feedback information is accurate.
2. According to the technical scheme, the three-dimensional geological fine modeling technology is adopted for fine modeling and visualization of the bad geological body, so that all the participants can comprehensively know the size of the bad geological body and the relation of the bad geological body to the tunnel.
3. According to the technical scheme, the three-dimensional geological modeling software is adopted to build a model, finite element software is introduced to calculate the simulated construction stress conditions of all working conditions, so that all participants can comprehensively know the risk degree of poor geological body area construction and comprehensively know the position to be reinforced in construction.
4. In the technical scheme, the method is simple and easy to implement based on the comprehensive geophysical prospecting three-dimensional geological modeling and finite element stress analysis technology; after the method is applied, the safety risk brought by construction of the bad geological body area can be reduced, visualization of the tunnel bad geological body is realized, data transmission sharing can be realized by adopting a wired or wireless mode, and each participant can know the situation of the tunnel bad geological body and tunnel excavation stress at any time.
Drawings
Fig. 1 is a system frame diagram of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
The embodiment specifically discloses a three-dimensional geological modeling and stress analysis method based on comprehensive geophysical prospecting, which is specifically understood by combining with fig. 1 and comprises the following steps:
s1: before a tunnel is dug, arranging the survey lines of earth surface geophysical prospecting along the trend of the tunnel, collecting the geophysical prospecting data outside the tunnel, and establishing a three-dimensional geological preliminary model of the poor geological body by using the geophysical prospecting data outside the tunnel; specifically, the hole external geophysical prospecting data are obtained according to the following mode: according to the result of geological investigation and the trend of a tunnel, reasonably arranging the survey lines of earth surface geophysical prospecting along the tunnel line, carrying out high-density electromagnetic geophysical prospecting of the tunnel earth surface by adopting a super digital direct current method instrument WDA-1 for the tunnel section with shallow burial depth, carrying out magnetotelluric geophysical prospecting of the tunnel earth surface by adopting an Aether magnetotelluric system for the tunnel section with deep burial depth, inputting geophysical prospecting data acquired by the high-density electrometer or the magnetotelluric system into EVS geological modeling software, and obtaining a three-dimensional geological preliminary model of the bad geological body by screening and highlighting low resistivity values;
more specifically, the out-hole geophysical prospecting data obtain a three-dimensional geological preliminary model of the bad geological body by screening and highlighting low resistivity values, specifically screening according to the resistivity values of surrounding rocks in a tunneling site area, and generally selecting a visual resistivity value smaller than 100-1000 Ω -m, and increasing by 100 to obtain the three-dimensional geological preliminary model of the bad geological body with different sizes of at least 10 parts of bad geological bodies;
the method further comprises the steps of correcting the three-dimensional geological preliminary model of the bad geological body: the method specifically comprises the following steps: carrying out geological investigation of a tunnel region, and recording geological information of a region along the tunnel to form out-hole geological investigation data; selecting at least two abnormal areas according to the three-dimensional geological preliminary model of the bad geologic body, selecting at least two points as drilling points, and collecting drilling data; correcting the three-dimensional geological preliminary model of the bad geologic body according to the out-hole geological survey data and the drilling data, screening and removing the incorrect three-dimensional geological preliminary model of the bad geologic body to obtain less than 10 preliminary model correction versions with different sizes of the bad geologic body; in step S2, the method for acquiring geophysical prospecting data in the hole includes any one or a combination of several of a geological radar method, a seismic wave method and a transient electromagnetic method.
S2: and according to the three-dimensional geological initial model of the bad geologic body and the disclosed tunnel face, guiding the arrangement of the geophysical survey lines in the tunnel and the arrangement of advanced drilling holes, verifying the accuracy of the established three-dimensional geological initial model of the bad geologic body by interpreting geophysical survey and drilling data in the tunnel, and according to screening, removing partial incorrect initial model correction plates to obtain a final three-dimensional geological model final plate of 1 bad geologic body.
S3: step S2, establishing a final version of the three-dimensional geologic model of the bad geologic body through EVS and/or Voxler software, and carrying out fine modeling and visualization on the final version of the three-dimensional geologic model of the bad geologic body; in the step S3, after the fine modeling, the scale size of the bad geologic body and the position of the bad geologic body relative to the tunnel can be clearly seen; a model area with better surrounding rock desalting conditions is adopted, a bad geologic body area with worse surrounding rock is highlighted, and then coordinates and a tunnel model are added to form a visual model; the visualization model can highlight the size of the tunnel bad geologic body and the position of the bad geologic body relative to the tunnel.
S4: performing geological model meshing on the final version of the poor geological body three-dimensional geological model after the fine modeling, exporting the final version into finite element software, and performing stress analysis on various excavation working conditions of a poor geological body tunnel by applying constraint conditions on the finite element software to form a stress analysis chart of tunnel excavation; specifically, the simulated excavation stress analysis technology adopts finite element software to simulate each working condition of tunnel excavation to carry out stress analysis, can carry out stress analysis on construction of different methods of a bad geologic body area, finds out an optimal bad geologic body treatment method, adopts a gridding three-dimensional geologic model derived by three-dimensional geologic modeling software to simulate each working condition of tunnel excavation, and forms a stress analysis graph of the tunnel after adding constraint conditions.
S5: and (3) feeding back the visual information of the poor geologic body three-dimensional geologic model in the step (S4) and the stress analysis graph of finite element analysis to a data sharing module for multiparty personnel information sharing. The data sharing module feeds back the visual information of the geologic model and the stress analysis graph of finite element analysis to an interface regulated by the data sharing module through importing the stress analysis graph of the three-dimensional geologic model final edition and the simulated excavation of each working condition of the bad geologic body, so that each participant can review the situation of the bad geologic body and the excavation risk situation at any time, and if the in-tunnel geophysical prospecting verification shows great abnormal geology, each participant can click early warning, and the data sharing module can automatically inform each participant in a short message mode.
According to the technical scheme, data are picked up in an out-of-hole comprehensive geophysical prospecting mode before tunnel excavation in a poor geological area to conduct poor geological three-dimensional modeling, geophysical prospecting data are used as main data sources of a three-dimensional geological model, drilling data and out-of-hole geological investigation data are used as constraint correction three-dimensional geological models, the three-dimensional geological model before tunnel excavation is formed based on the three-dimensional geological models, after tunnel excavation, the existing three-dimensional geological model is corrected according to the geological investigation data in the hole and the geophysical prospecting data in the hole, fine modeling correction is conducted on the three-dimensional geological model, three-dimensional visualization is conducted on places with severe poor geology, meanwhile, the three-dimensional geological model is exported into a format identifiable by finite element software after being meshed, construction excavation stress analysis is conducted, and simulated excavation force diagrams are formed. And importing the bad geologic body visualization model and the simulated excavation force diagram into a data sharing module, integrating the bad geologic body three-dimensional visualization model and the construction simulated excavation force diagram by the data sharing module, displaying the relative relation between each bad geologic body and the tunnel and the excavation construction force analysis diagram, and storing, transmitting and sharing data by the data sharing module. The method and the system can facilitate constructors to know the position of the bad geologic body relative to the tunnel and the risk of construction of the bad geologic body area, and facilitate all parties to know the condition of the bad geologic body of the tunnel. If the geophysical prospecting in the hole has great abnormal geology, and after drilling confirmation, each participant can click on the early warning, and the data sharing module can automatically inform each participant in a short message mode.
Example 2
A three-dimensional geologic modeling and stress analysis system based on comprehensive geophysical prospecting, the system comprising:
the system comprises a data acquisition module, a data processing module, a modeling module, a finite element analysis module and a data sharing module;
the data acquisition module is used for acquiring geophysical prospecting data, geological survey data and drilling data inside and outside the tunnel;
the data processing module is used for analyzing and extracting different types of data collected by the data acquisition module to form a three-dimensional geological model modeling element;
the modeling module performs modeling by using modeling elements formed by the data processing module to obtain a bad geological body visualization model of the tunnel;
and the finite element analysis module performs stress analysis of each simulation working condition of the bad geological body section through the bad geological body visual model obtained by the modeling module with the guided gridding so as to obtain a tunnel stress analysis chart of the bad geological body section.
The data sharing module is used for leading the bad geologic body visual model established by the modeling module and the tunnel stress analysis diagram of the bad geologic body section established by the finite element analysis module into a data sharing interface so as to enable each participant to know the situation at any time.
The system of the embodiment 2 is used for carrying out modeling analysis of bad geologic bodies according to the modeling and stress analysis method of the embodiment, and the geological conditions of a tunnel section can be timely obtained in the construction process of the tunnel, and the best construction mode is known for carrying out construction operation. The construction efficiency is higher and the safety is also higher.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. A three-dimensional geological modeling and stress analysis method based on comprehensive geophysical prospecting is characterized by comprising the following steps:
s1: before a tunnel is dug, arranging the survey lines of earth surface geophysical prospecting along the trend of the tunnel, collecting the geophysical prospecting data outside the tunnel, and establishing a three-dimensional geological preliminary model of the poor geological body by using the geophysical prospecting data outside the tunnel;
s2: excavating a tunnel portal section, and collecting in-tunnel face sketch and in-tunnel geophysical prospecting data as the initial model established in the supplementary data correction step S1 to form a final version of the poor geological three-dimensional geological model;
s3: establishing the three-dimensional geological model in the step S1 and the step S2 through EVS and/or Voxler software, and carrying out fine modeling and visualization on the final version of the poor geological body three-dimensional geological model;
s4: performing geological model meshing on the final version of the poor geological body three-dimensional geological model after the fine modeling, exporting the final version into finite element software, and performing stress analysis on various excavation working conditions of a poor geological body tunnel by applying constraint conditions on the finite element software to form a stress analysis chart of tunnel excavation;
s5: and (3) feeding back the visual information of the poor geologic body three-dimensional geologic model in the step (S4) and the stress analysis graph of finite element analysis to a data sharing module for multiparty personnel information sharing.
2. The method for three-dimensional geologic modeling and stress analysis based on comprehensive geophysical prospecting according to claim 1, wherein in step S1, the hole-outside geophysical prospecting data are obtained according to the following method: according to the result of geological investigation and the trend of the tunnel, the survey lines of earth surface geophysical prospecting are reasonably arranged along the tunnel line, the super digital DC electric method instrument WDA-1 is adopted for carrying out high-density electromagnetic geophysical prospecting of the tunnel earth surface on the tunnel section with shallow burial depth, the Aether magnetotelluric system is adopted for carrying out magnetotelluric geophysical prospecting of the tunnel earth surface on the tunnel section with deep burial depth, geophysical prospecting data acquired by the high-density electric method instrument or the magnetotelluric system are input into EVS geological modeling software, and a three-dimensional geological preliminary model of the bad geological body is obtained through screening and highlighting low resistivity values.
3. The method for three-dimensional geologic modeling and stress analysis based on comprehensive geophysical prospecting according to claim 2, wherein the specific method is characterized in that screening is performed according to resistivity values of surrounding rocks of a tunneling site area, and a three-dimensional geologic preliminary model of poor geologic bodies with different sizes of at least 10 poor geologic bodies is obtained by increasing 100, wherein apparent resistivity values are generally selected to be smaller than 100-1000 Ω -m.
4. The method for three-dimensional geologic modeling and stress analysis based on comprehensive geophysical prospecting according to claim 3, wherein in step S1, the method further comprises the following steps: carrying out geological investigation of a tunnel region, and recording geological information of a region along the tunnel to form out-hole geological investigation data; selecting at least two abnormal areas according to the three-dimensional geological preliminary model of the bad geologic body, selecting at least two points as drilling points, and collecting drilling data; and correcting the three-dimensional geological preliminary model of the bad geologic body according to the out-hole geological survey data and the drilling data, screening and removing the incorrect three-dimensional geological preliminary model of the bad geologic body, and obtaining less than 10 preliminary model correction versions with different sizes of the bad geologic body.
5. The method for three-dimensional geologic modeling and stress analysis based on comprehensive geophysical prospecting according to claim 4, wherein the method is characterized in that according to the three-dimensional geologic initial model of the bad geological body and the disclosed tunnel face, the arrangement of geophysical prospecting lines in a tunnel is guided, the arrangement of drilling holes is advanced, the accuracy of the established three-dimensional geologic initial model of the bad geological body is verified by interpreting geophysical prospecting and drilling data in the tunnel, and according to screening, a part of incorrect initial model correction is removed, so that a final three-dimensional geologic model of the bad geological body is obtained.
6. The method for three-dimensional geological modeling and stress analysis based on comprehensive geophysical prospecting according to claim 2, wherein in step S2, the method for acquiring geophysical prospecting data in a hole comprises any one or a combination of several of a geological radar method, a seismic wave method and a transient electromagnetic method; the primary model is corrected by the size and the position of the large-sized bad geologic body, and the small-sized bad geologic body is added into the three-dimensional geologic model.
7. The method for three-dimensional geologic modeling and stress analysis based on comprehensive geophysical prospecting according to claim 1, wherein in step S3, after the modeling is refined, the scale of the bad geologic body and the position of the bad geologic body relative to the tunnel can be clearly seen; the visualization is based on EVS and/or Voxler software, a model area with better surrounding rock desalting conditions is adopted, a bad geological body area with worse surrounding rock is highlighted, and then a coordinate and tunnel model are added to form a visualization model; the visualization model can highlight the size of the tunnel bad geologic body and the position of the bad geologic body relative to the tunnel.
8. The method for three-dimensional geological modeling and stress analysis based on comprehensive geophysical prospecting according to claim 1, wherein the technique for simulating excavation stress analysis adopts finite element software to simulate each working condition of tunnel excavation to perform stress analysis, stress analysis can be performed on different method constructions of bad geological body areas, an optimal bad geological body treatment method is found out, a three-dimensional geological model is derived from a geological model analyzed by the finite element software by adopting three-dimensional geological modeling software, each working condition of tunnel excavation is simulated, and a stress analysis chart of the tunnel is formed after constraint conditions are added.
9. The method for three-dimensional geological modeling and stress analysis based on comprehensive geophysical prospecting according to claim 2, wherein in step S5, the data sharing module is used for simulating the stress analysis graph of excavation by importing the final version of the three-dimensional geological model of the bad geological body and each working condition, feeding back the visual information of the geological model and the stress analysis graph of finite element analysis to the interface regulated by the data sharing module, so that each participant can review the situation of the bad geological body and the excavation risk situation at any time, and if the geophysical prospecting in the hole verifies that serious abnormal geology occurs, each participant can click for early warning, and the data sharing module can automatically inform each participant in a short message mode.
10. A three-dimensional geologic modeling and stress analysis system based on comprehensive geophysical prospecting, which is characterized by comprising:
the system comprises a data acquisition module, a data processing module, a modeling module, a finite element analysis module and a data sharing module;
the data acquisition module is used for acquiring geophysical prospecting data, geological survey data and drilling data inside and outside the tunnel;
the data processing module is used for analyzing and extracting different types of data collected by the data acquisition module to form a three-dimensional geological model modeling element;
the modeling module performs modeling by using modeling elements formed by the data processing module to obtain a bad geological body visualization model of the tunnel;
and the finite element analysis module performs stress analysis of each simulation working condition of the bad geological body section through the bad geological body visual model obtained by the modeling module with the guided gridding so as to obtain a tunnel stress analysis chart of the bad geological body section.
The data sharing module is used for leading the bad geologic body visual model established by the modeling module and the tunnel stress analysis diagram of the bad geologic body section established by the finite element analysis module into a data sharing interface so as to enable each participant to know the situation at any time.
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