A ground and tunnel joint full-time domain induced polarization advance detection method and system

Abstract

The present invention belongs to the field of full-time domain induced polarization detection, and provides a ground and tunnel joint full-time domain induced polarization advance detection method and system, which obtains geological survey data of the target detection area; determines the layout scheme of the ground and tunnel joint full-time domain induced polarization device based on the acquired geological survey data of the target detection area; obtains actual observation data based on the arranged ground and tunnel joint full-time domain induced polarization device; performs full-time domain induced polarization inversion in combination with the actual observation data, obtains the polarizability, resistivity and relaxation time distribution of the target area in front of the tunnel face, and then obtains the position and morphology information of the water-bearing geological structure. It solves the problems of limited layout of small electrodes in the tunnel space and inconvenient movement of large-volume transmitters.

Description

Technical Field

[0001] The present invention belongs to the field of full-time domain induced polarization detection, and in particular relates to a ground and tunnel combined full-time domain induced polarization advance detection method and system. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The underground geological conditions are extremely complex, including unfavorable geological conditions such as karst caves, weak interlayers, and water-rich zones. These factors can easily cause disasters such as sudden water inrush, stratum instability, and surface collapse, and are also accompanied by casualties, economic losses, and equipment damage, posing a huge threat to tunnel construction safety. In order to ensure construction safety, it is particularly important to carry out advanced tunnel geological forecasting.

[0004] The full-time domain induced polarization method is sensitive to low-resistance anomalies and has broad application prospects in the detection of water-bearing structures. According to the different observation spaces or workplaces, the induced polarization method is mainly divided into the induced polarization method on the ground and the induced polarization method in the tunnel. The field source and receiving device of the ground induced polarization method are both arranged on the surface, which is suitable for the exploration of shallow and large-scale hidden geological structures. The detection resolution of deep buried tunnels is low, and the undulating terrain makes it difficult for this method to identify geological anomalies. The traditional tunnel induced polarization advance detection technology is restricted by the narrow environment of the tunnel, the electrode arrangement is limited, the high-power power transmitter is large in size, the transportation consumes manpower and material resources, and the detection efficiency is low, which in turn affects the tunnel construction. There are safety hazards when the high-power power supply works in the humid environment of the tunnel, which is difficult to meet the needs of safe construction. Therefore, it is urgent to study more effective detection methods. Summary of the invention

[0005] In order to solve at least one technical problem existing in the above-mentioned background technology, the present invention provides a ground and tunnel joint full-time domain induced polarization advance detection method and system, which proposes a ground-tunnel joint full-time domain induced polarization advance detection method in which field sources and power supply electrodes are arranged on the ground, and measuring electrodes are arranged in the tunnel for receiving.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A first aspect of the present invention provides a ground and tunnel joint full-time domain induced polarization advance detection method, comprising the following steps:

[0008] Obtain geological survey data of the target detection area;

[0009] Determine the layout of the ground and tunnel combined full-time domain induced polarization device based on the acquired geological survey data of the target detection area;

[0010] Acquire actual observation data based on the combined full-time domain induced polarization device arranged on the ground and in the tunnel;

[0011] Combined with the actual observation data, full-time domain induced polarization inversion is performed to obtain the polarizability, resistivity and relaxation time distribution of the target area in front of the tunnel face, and then obtain the location and morphological information of the water-bearing geological structure.

[0012] Furthermore, the method of determining the layout of the ground and tunnel combined full-time domain induced polarization device based on the acquired geological survey data of the target detection area includes:

[0013] Determine the depth of tunnel burial depth based on geological survey data;

[0014] The number of power supply electrodes, the electrode spacing and the transmitter position are arranged on the surface based on the determined tunnel burial depth, the transmitter is arranged in the non-detection area, and the power supply electrodes are arranged to cover the entire detection area;

[0015] Receiving electrodes are arranged on the tunnel face and connected to the receiver, while the transmitter is connected to the power supply electrode on the ground in sequence.

[0016] Furthermore, based on the full-time domain induced polarization device arranged on the ground and in the tunnel, by manipulating the transmitter to transmit and the receiver to receive, the measured potential data is obtained as the actual observation data.

[0017] Furthermore, the geological survey data of the target detection area includes relevant information of the surface and tunnels of the target detection area, including topography, tunnel burial depth and tunnel longitudinal profile information.

[0018] Furthermore, when performing full-time domain induced polarization inversion in combination with actual observation data, unstructured network modeling is performed on the detection tunnel area to obtain an unstructured grid finite element model. The forward modeling process in the full-time domain induced polarization inversion is performed based on the unstructured grid finite element model to interpret the actual observation data.

[0019] Furthermore, when performing full-time domain induced polarization inversion in combination with actual observation data, geological analysis and advance drilling information in the tunnel are introduced as prior information constraints into the tunnel full-time domain induced polarization inversion objective function.

[0020] The second aspect of the present invention provides a ground and tunnel joint full-time domain induced polarization advance detection system, which adopts the ground and tunnel joint full-time domain induced polarization advance detection method described in the first invention, comprising:

[0021] A geological survey data acquisition module, which is used to acquire geological survey data of the target detection area;

[0022] An arrangement scheme determination module is used to determine an arrangement scheme of the ground and tunnel combined full-time domain induced polarization device based on the acquired geological survey data of the target detection area;

[0023] An observation data acquisition module, which is used to acquire actual observation data based on the arranged ground and tunnel combined full-time domain induced polarization device;

[0024] The advanced detection module is used to perform full-time domain induced polarization inversion in combination with actual observation data to obtain the polarizability, resistivity and relaxation time distribution of the target area in front of the tunnel face, and then obtain the location and morphological information of the water-bearing geological structure.

[0025] Furthermore, in the arrangement scheme determination module, the arrangement scheme of the ground and tunnel combined full-time domain induced polarization device is determined based on the acquired geological survey data of the target detection area, including:

[0026] Determine the depth of tunnel burial depth based on geological survey data;

[0027] The number of power supply electrodes, the electrode spacing and the transmitter position are arranged on the surface based on the determined tunnel burial depth, the transmitter is arranged in the non-detection area, and the power supply electrodes are arranged to cover the entire detection area;

[0028] Receiving electrodes are arranged on the tunnel face and connected to the receiver, while the transmitter is connected to the power supply electrode on the ground in sequence.

[0029] Furthermore, in the observation data acquisition module, based on the full-time domain induced polarization device arranged on the ground and in the tunnel, the measured potential data is acquired as the actual observation data by controlling the transmitter to transmit and the receiver to receive.

[0030] Furthermore, in the advanced detection module, when performing full-time domain induced polarization inversion in combination with actual observation data, unstructured network modeling is performed on the detection tunnel area to obtain an unstructured grid finite element model, and the forward modeling process in the full-time domain induced polarization inversion is performed based on the unstructured grid finite element model to interpret the actual observation data.

[0031] A third aspect of the present invention provides a computer-readable storage medium.

[0032] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps in the above-mentioned ground and tunnel joint full-time domain induced polarization advance detection method.

[0033] A fourth aspect of the present invention provides a computer device.

[0034] A computer device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps in the above-mentioned ground and tunnel joint full-time domain induced polarization advance detection method are implemented.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. Aiming at the problem that the tunnel has a small operable space and is not suitable for arranging long poles, the present invention has established a ground-tunnel joint full-time domain induced polarization advance detection device that is excited on the ground and received in the tunnel. It combines the advantages of ground (flexible construction, easy to arrange high-power field source) and tunnel (measurement electrode close to the target body, strong signal response) observation methods, and improves the full-time domain induced polarization detection efficiency, detection depth and sensitivity to deep anomalies. In addition, this method only requires the arrangement of measurement electrodes in the tunnel to connect the receiver and the computer, and the high-power generator and power supply electrodes are arranged on the surface, which solves the safety hazard of the high-power generator caused by humidity in the tunnel and ensures the construction safety of the workers.

[0037] 2. The present invention can better fit complex geometric models based on unstructured grids, and has the advantage of being easy to locally encrypt, realizes modeling of different types of terrain, comprehensively considers the influence of surface undulations on electric field distribution, and reduces forward calculation errors.

[0038] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0040] Figure 1 This is a flow chart of a ground and tunnel joint full-time domain induced polarization advance detection method provided by an embodiment of the present invention;

[0041] Figure 2 It is a schematic structural diagram of a ground and tunnel joint full-time domain induced polarization advance detection device provided by an embodiment of the present invention;

[0042] Among them, 1. Transmitter; 2. Receiver; 3. Cable; 4. Receiving electrode; 5. Tunnel face; 6. Water-bearing structure; 7. Power supply electrode; 8. Cave; 9. Computer. DETAILED DESCRIPTION

[0043] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0044] It should be noted that the following detailed descriptions are all illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0045] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0046] In view of the limited electrode arrangement in the tunnel space, the inconvenience of moving large-volume transmitters and the potential safety hazards in humid environments, and the undulating terrain on the ground, a ground-tunnel joint full-time-domain induced polarization advance detection method is proposed, combining the advantages of the ground and tunnel full-time-domain induced polarization advance detection methods, in which the field source and power supply electrodes are arranged on the ground, and the measuring electrodes are arranged and received in the tunnel. This detection method can combine the advantages of the ground and tunnel full-time-domain induced polarization advance detection technology, break through the limitation that the small space in the tunnel is not conducive to the arrangement of electrodes; use the unstructured grid method to model, eliminate the influence of the undulating ground on the electric field distribution; solve the problem of unsafe use of humid high-power generators in tunnels, and provide a new solution for the long-distance rapid detection of high-risk water-containing structural disaster sources in tunnels, effectively ensuring the construction safety of workers in tunnels and the construction period of the project.

[0047] Embodiment 1

[0048] like Figure 1 As shown, this embodiment provides a ground and tunnel joint full-time domain induced polarization advance detection method, including the following steps:

[0049] Step 1: Obtain geological survey data of the target detection area;

[0050] The geological survey data includes relevant information of the surface and tunnels of the target detection area, including topography, tunnel burial depth, tunnel longitudinal profile and other information.

[0051] Step 2: Determine the layout of the ground and tunnel combined full-time domain induced polarization device based on the acquired geological survey data of the target detection area;

[0052] like Figure 2As shown, taking the underground conditions as an example, the underground contains a cave 8. In order to accurately locate the water-bearing structure 6, the water-bearing structure 6 in this embodiment determines the depth of the tunnel buried at the surface where the power supply electrode 7 and the transmitter 1 are arranged according to the longitudinal section of the tunnel, and the power supply electrode 7 and the transmitter 1 are arranged. The transmitter 1 is arranged in the non-detection area, and the power supply electrode 7 is arranged to cover the entire detection area; the receiving electrode 4 is arranged on the tunnel face 5 and connected to the receiver 2, and the transmitter 1 and the power supply electrode 7 are connected in sequence on the ground through the cable 3; the computer 9 is used to control the transmitter to transmit and the receiver to receive.

[0053] This embodiment proposes a ground-tunnel joint full-time domain induced polarization advance detection method in which a field source is arranged on the ground and receiving is performed in a tunnel. Electrodes are arranged on the ground and in the tunnel at the same time, a power supply electrode 7 is arranged on the ground, and a receiving electrode 4 is arranged in the tunnel. This solves the problem of small space in the tunnel, limited electrode arrangement space, and inconvenient electrode arrangement. Since the transmitter is arranged on the surface, the construction of support in the tunnel does not need to consider the position of the generator, and the generator does not need to be moved frequently, which does not affect the construction of the support structure in the tunnel, saves manpower and physics, improves the speed of tunnel construction, and ensures the construction period.

[0054] Step 3: Acquire actual observation data based on the combined full-time domain induced polarization device arranged on the ground and in the tunnel;

[0055] In this embodiment, based on the full-time domain induced polarization device arranged on the ground and in the tunnel, the measured potential data is obtained as the actual observation data by controlling the transmitter to transmit and the receiver to receive.

[0056] Step 4: Combine the actual observation data to perform full-time domain induced polarization inversion to obtain the polarizability, resistivity and relaxation time distribution of the target area in front of the tunnel face, and then obtain the location and morphology information of the water-bearing geological structure;

[0057] In step 4, when performing full-time domain induced polarization inversion in combination with actual observation data, unstructured network modeling is performed on the detection tunnel area to obtain an unstructured grid finite element model. The forward modeling process in the full-time domain induced polarization inversion is performed based on the unstructured grid finite element model to interpret the actual observation data.

[0058] In this embodiment, when performing finite element modeling of the non-structural network of the detection tunnel area, tunnel finite element modeling software or an existing finite element modeling algorithm is used for modeling;

[0059] It discretizes a continuous physical system into a finite number of small, interconnected units, which are called "finite elements". Each unit has its own specific shape and size, and the behavior of the entire system can be approximately simulated by analyzing each unit. The advantage of this method is that it can handle complex geometries and boundary conditions, as well as nonlinear problems.

[0060] Unstructured grids can better fit complex geometric models, and it is easy to take advantage of local encryption to model complex terrain and eliminate the impact of surface undulations on the electric field distribution.

[0061] Among them, when performing full-time domain induced polarization inversion in combination with actual observation data, geological analysis and advance drilling information in the tunnel (such as advance water exploration in drilling holes) are introduced as prior information constraints into the tunnel full-time domain induced polarization inversion objective function.

[0062] Finally, the actual observation data is interpreted to obtain the polarizability distribution, resistivity distribution and relaxation time distribution of the target area in front of the tunnel face to obtain information such as the location and morphology of the water-bearing structure in the tunnel. Through the above scheme, the ground-tunnel joint full-time domain induced polarization advance detection device received in the tunnel can be better combined with the unstructured grid to fit complex geometric models and realize different types of terrain modeling, eliminating the influence of surface morphology on the detection results, reducing the forward simulation error, thereby improving the inversion effect of the disaster-causing water-bearing body and improving the detection accuracy.

[0063] Embodiment 2

[0064] This embodiment provides a ground and tunnel joint full-time domain induced polarization advance detection system, including:

[0065] A geological survey data acquisition module, which is used to acquire geological survey data of the target detection area;

[0066] An arrangement scheme determination module is used to determine an arrangement scheme of the ground and tunnel combined full-time domain induced polarization device based on the acquired geological survey data of the target detection area;

[0067] An observation data acquisition module, which is used to acquire actual observation data based on the arranged ground and tunnel combined full-time domain induced polarization device;

[0068] The advanced detection module is used to perform full-time domain induced polarization inversion in combination with actual observation data to obtain the polarizability, resistivity and relaxation time distribution of the target area in front of the tunnel face, and then obtain the location and morphological information of the water-bearing geological structure.

[0069] Among them, in the geological survey data acquisition module, the geological survey data of the target detection area includes relevant information of the surface and tunnels of the target detection area, including topography, tunnel burial depth and tunnel longitudinal profile information.

[0070] Among them, in the arrangement scheme determination module, the arrangement scheme of the ground and tunnel combined full-time domain induced polarization device is determined based on the acquired geological survey data of the target detection area, including:

[0071] Determine the depth of tunnel burial depth based on geological survey data;

[0072] The number of power supply electrodes, the electrode spacing and the transmitter position are arranged on the surface based on the determined tunnel burial depth, the transmitter is arranged in the non-detection area, and the power supply electrodes are arranged to cover the entire detection area;

[0073] Receiving electrodes are arranged on the tunnel face and connected to the receiver, while the transmitter is connected to the power supply electrode on the ground in sequence.

[0074] The present embodiment proposes a ground-tunnel joint full-time domain induced polarization advance detection method in which a field source is arranged on the ground and received in a tunnel. By arranging electrodes on the ground and in the tunnel at the same time, power supply electrodes are arranged on the ground and receiving electrodes are arranged in the tunnel. This solves the problem of small space in the tunnel, limited electrode arrangement space, and inconvenient electrode arrangement. Since the transmitter is arranged on the surface, the construction of support in the tunnel does not need to consider the position of the generator, and the generator does not need to be moved frequently, which does not affect the construction of the support structure in the tunnel, saves manpower and physics, improves the speed of tunnel construction, and ensures the construction period.

[0075] Among them, in the observation data acquisition module, based on the full-time domain induced polarization device arranged on the ground and in the tunnel, the measured potential data is acquired as the actual observation data by controlling the transmitter to transmit and the receiver to receive.

[0076] Among them, in the advanced detection module, when the full-time domain induced polarization inversion is performed in combination with the actual observation data, the unstructured network modeling is performed on the detection tunnel area to obtain the unstructured grid finite element model, and the forward modeling process in the full-time domain induced polarization inversion is performed based on the unstructured grid finite element model to interpret the actual observation data.

[0077] Among them, in the advanced detection module, when combining the actual observation data for full-time domain induced polarization inversion, the geological analysis and the advance drilling information in the tunnel are introduced as prior information constraints into the tunnel full-time domain induced polarization inversion objective function.

[0078] It should be noted that the tunnel full-time domain induced polarization inversion objective function is constructed using an existing algorithm, which is not specifically described in this embodiment.

[0079] Through the above scheme, the ground-tunnel joint full-time domain induced polarization advance detection device for receiving in the tunnel can be better combined with the unstructured grid to fit complex geometric models and realize different types of terrain modeling, thereby eliminating the influence of surface morphology on the detection results, reducing the forward simulation error, and thus improving the inversion effect of disaster-causing water bodies and improving the detection accuracy.

[0080] Embodiment 3

[0081] This embodiment provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the steps in the ground and tunnel joint full-time domain induced polarization advance detection method as described above are implemented.

[0082] Embodiment 4

[0083] This embodiment provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the steps in the ground and tunnel joint full-time domain induced polarization advance detection method as described above are implemented.

[0084] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A ground and tunnel joint full-time domain induced polarization advance detection method, characterized in that: The steps include: Obtain geological survey data of the target detection area; Determining the arrangement of the ground and tunnel combined full-time domain induced polarization device based on the acquired geological survey data of the target detection area, including: determining the depth of the tunnel burial depth according to the geological survey data, wherein the geological survey data includes relevant information of the surface and the tunnel of the target detection area, including topography, tunnel burial depth, and tunnel longitudinal profile information; The number of power supply electrodes, the electrode spacing and the transmitter position are arranged on the surface based on the determined tunnel burial depth, the transmitter is arranged in the non-detection area, and the power supply electrodes are arranged to cover the entire detection area; The receiving electrode is laid out on the tunnel face and connected to the receiver, and the transmitter is connected to the power supply electrode on the ground in sequence; Acquire actual observation data based on the combined full-time domain induced polarization device arranged on the ground and in the tunnel; Full-time domain induced polarization inversion is performed in combination with actual observation data to obtain the polarizability, resistivity and relaxation time distribution of the target area in front of the tunnel face, and then the location and morphological information of the water-bearing geological structure is obtained. When full-time domain induced polarization inversion is performed in combination with actual observation data, an unstructured network model is performed on the detection tunnel area to obtain an unstructured grid finite element model. The forward modeling process in the full-time domain induced polarization inversion is performed based on the unstructured grid finite element model to interpret the actual observation data.

2. A ground and tunnel joint full-time domain induced polarization advance detection method as claimed in claim 1, characterized in that: Based on the full-time domain induced polarization device arranged on the ground and in the tunnel, the measured potential data are obtained as the actual observation data by controlling the transmitter to transmit and the receiver to receive.

3. A ground and tunnel joint full-time domain induced polarization advance detection method as claimed in claim 1, characterized in that: When combining actual observation data for full-time domain induced polarization inversion, geological analysis and advance drilling information in the tunnel are introduced as prior information constraints into the tunnel full-time domain induced polarization inversion objective function.

4. A ground and tunnel joint full-time domain induced polarization advance detection system, using a ground and tunnel joint full-time domain induced polarization advance detection method according to any one of claims 1 to 3, characterized in that: include: A geological survey data acquisition module, which is used to acquire geological survey data of the target detection area; A layout scheme determination module is used to determine the layout scheme of the ground and tunnel combined full-time domain induced polarization device based on the acquired geological survey data of the target detection area, including: determining the depth of the tunnel burial depth according to the geological survey data, wherein the geological survey data includes relevant information of the surface and tunnel of the target detection area, including topography, tunnel burial depth, and tunnel longitudinal profile information; The number of power supply electrodes, the electrode spacing and the transmitter position are arranged on the surface based on the determined tunnel burial depth, the transmitter is arranged in the non-detection area, and the power supply electrodes are arranged to cover the entire detection area; The receiving electrode is laid out on the tunnel face and connected to the receiver, and the transmitter is connected to the power supply electrode on the ground in sequence; An observation data acquisition module, which is used to acquire actual observation data based on the arranged ground and tunnel combined full-time domain induced polarization device; The advanced detection module is used to perform full-time domain induced polarization inversion in combination with actual observation data to obtain the polarizability, resistivity and relaxation time distribution of the target area in front of the tunnel face, and then obtain the location and morphological information of the water-bearing geological structure. When performing full-time domain induced polarization inversion in combination with actual observation data, unstructured network modeling is performed on the detection tunnel area to obtain an unstructured grid finite element model. The forward modeling process in the full-time domain induced polarization inversion is performed based on the unstructured grid finite element model, thereby interpreting the actual observation data.

5. A ground and tunnel joint full-time domain induced polarization advance detection system as claimed in claim 4, characterized in that: In the observation data acquisition module, based on the full-time domain induced polarization device arranged on the ground and in the tunnel, the measured potential data is acquired as the actual observation data by controlling the transmitter to transmit and the receiver to receive.

6. A ground and tunnel joint full-time domain induced polarization advance detection system as claimed in claim 4, characterized in that: When combining actual observation data for full-time domain induced polarization inversion, geological analysis and advance drilling information in the tunnel are introduced as prior information constraints into the tunnel full-time domain induced polarization inversion objective function.

Images