Tunnel dangerous block identification and targeted reinforcement method based on discontinuous deformation analysis

Abstract

The present invention discloses a method for identifying and targetedly reinforcing dangerous blocks in a tunnel based on discontinuous deformation analysis, comprising: setting fixed points, loading points, monitoring points, joint parameters, hole parameters, ground stress, system anchor parameters and other information of a calculation model according to actual conditions of a simulated project, and constructing a discontinuous calculation model; simulating the deformation and movement process of surrounding rock blocks after tunnel excavation is completed based on a discontinuous deformation analysis method, and monitoring the vertical displacement of each block in real time. If the displacement is greater than a set value, it is classified as a collapsed block, otherwise it is a safe block, and the number of the dangerous block is recorded; according to the position of the collapsed block under initial conditions, the system anchor that passes through the collapsed block is retrieved, and the length of the anchor is gradually extended until all blocks are safe blocks, thereby determining the length of the anchor and realizing targeted reinforcement of dangerous blocks in the tunnel.

Description

Technical Field

[0001] The present invention belongs to the technical field of tunnel dangerous block monitoring, and in particular to a tunnel dangerous block identification and targeted reinforcement method based on discontinuous deformation analysis. Background Art

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

[0003] With the rapid development of underground engineering construction in my country, my country has become the country with the largest scale, number and difficulty of tunnel construction in the world. However, during the tunnel construction process, non-continuous geological bodies such as faults and joints are often encountered, which can easily induce tunnel surrounding rock collapse disasters. Tunnel surrounding rock collapse disasters are highly sudden and highly catastrophic. At the least, they can cause equipment damage and economic losses, and at the worst, they can cause the death of construction workers and cause adverse social impacts. Therefore, it is urgent to carry out research on the identification of dangerous blocks in tunnels and targeted reinforcement methods to provide a basis for the prevention and control of tunnel surrounding rock collapse disasters.

[0004] At present, the identification of dangerous blocks in tunnels mainly adopts geometric analysis methods, such as block theory and polar flat projection method, which ignores the effect of ground stress on dangerous blocks in tunnels. In addition, since the existing numerical simulation methods of non-continuous media are mainly based on particle discrete elements, it is difficult to accurately simulate the movement process and interaction of blocks. In addition, in the actual excavation process of tunnels, system anchors are often used for reinforcement, which makes it difficult to achieve effective reinforcement effects for isolated dangerous blocks. Summary of the invention

[0005] In order to overcome the shortcomings of the above-mentioned prior art, the present invention provides a tunnel dangerous block identification and targeted reinforcement method based on discontinuous deformation analysis, which can monitor the vertical displacement of tunnel surrounding rock blocks in real time, dynamically identify dangerous blocks, dynamically correct the anchor rod length, and realize effective reinforcement of dangerous blocks based on discontinuous deformation analysis.

[0006] To achieve the above objectives, one or more embodiments of the present disclosure provide the following technical solutions:

[0007] In the first aspect, a method for identifying dangerous blocks in tunnels and targeted reinforcement based on discontinuous deformation analysis is disclosed, including:

[0008] Construct a discontinuous calculation model based on the actual conditions of the simulation project;

[0009] Add system anchors and obtain the initial length of the anchors;

[0010] Based on the discontinuous calculation model, the initial position information of the block is obtained and the ground stress is applied;

[0011] According to the applied ground stress, the blocks are subjected to discontinuous deformation calculation and analysis, and the blocks are divided into collapsed blocks and safe blocks;

[0012] Dynamically adjust the anchor length for collapsed blocks: based on the initial length of the anchor, gradually extend the length of the anchor at the collapsed block until all collapsed blocks are converted into safe blocks. Then determine the length of the anchor and carry out targeted reinforcement of the collapsed blocks in the tunnel.

[0013] A further technical solution is to obtain the occurrence of the structural surface, ground stress distribution, and tunnel parameter information of the actual project during the construction of the non-continuous calculation model, and then convert the above information into an input command stream, and automatically build the model by reading the command stream.

[0014] A further technical solution is that constructing a discontinuous calculation model also includes: automatically constructing the model, adding structural surfaces, and cutting the entire calculation model into multiple independent blocks, thereby forming a discontinuous calculation model.

[0015] A further technical solution is to perform discontinuous deformation calculation and analysis on the block according to the applied ground stress, specifically:

[0016] The vertical displacement of the block is detected. If it is greater than the set value, it is classified as a collapsed block, otherwise it is a safe block.

[0017] A further technical solution is to first set the coordinates of the monitoring points of the block in a discontinuous calculation model when detecting the vertical displacement of the block. After applying the ground stress, the coordinates of the monitoring points of the block are obtained again, and the vertical displacement of the block is obtained by the difference between the two coordinates.

[0018] A further technical solution is to record the collapsed block number for the collapsed block and determine the anchor number that passes through the collapsed block under the initial condition before the ground stress is applied to the block.

[0019] A further technical solution is to gradually extend the length of the anchor rod at the location of the collapsed block based on the initial length of the anchor rod, specifically:

[0020] For the first time, the length of the anchor rod passing through the collapsed block is extended by the first threshold, and the numerical simulation is repeated to apply ground stress to the collapsed block and monitor the vertical displacement of the collapsed block. If the vertical displacement is still greater than the set value, the length of the anchor rod is further extended by the first threshold until the vertical displacement of each collapsed block is less than the set value.

[0021] Secondly, a tunnel dangerous block identification and targeted reinforcement system based on discontinuous deformation analysis is disclosed, including:

[0022] The discontinuous calculation model building module is configured to: build a discontinuous calculation model according to actual conditions of the simulation project;

[0023] Add system anchors and obtain the initial length of the anchors;

[0024] The block division module is configured to: obtain initial position information of the block based on a discontinuous calculation model and apply ground stress;

[0025] According to the applied ground stress, the blocks are subjected to discontinuous deformation calculation and analysis, and the blocks are divided into collapsed blocks and safe blocks;

[0026] The targeted reinforcement module is configured as follows: for collapsed blocks, the length of the anchor rod at the location of the collapsed block is gradually extended based on the initial length of the anchor rod until all collapsed blocks are converted into safe blocks, and then the length of the anchor rod is determined to carry out targeted reinforcement of the collapsed blocks in the tunnel.

[0027] Traditional tunnel anchor rods are installed along the tunnel contour in a circle of equal length and equal spacing. If there is a dangerous block in a certain area, the length of the anchor rods in this area must be increased and the spacing of the anchor rods must be reduced. The technical solution of the present invention can achieve the above requirements.

[0028] One or more of the above technical solutions have the following beneficial effects:

[0029] The current block theory methods do not take into account the ground stress and the interaction force between blocks, and there are relatively few methods to simulate block movement. Traditional methods such as PFC and SPH all use particles as the basic unit for numerical simulation.

[0030] The discontinuous deformation analysis method is a numerical simulation method for simulating block movement, similar to finite element analysis. The discontinuous deformation analysis method used in the present invention takes into account the interaction of blocks, etc., and realizes accurate simulation of the movement process and interaction of surrounding rock blocks after tunnel excavation is completed, laying the foundation for the identification and targeted reinforcement of dangerous blocks in tunnels. In addition, the present invention uses the discontinuous deformation analysis method to perform numerical simulation based on blocks as the basic unit, which can better show the process of block collapse.

[0031] The present invention solves the problem of identifying dangerous blocks in the tunnel by real-time monitoring the vertical displacement of surrounding rock blocks after tunnel excavation is completed.

[0032] The present invention realizes targeted reinforcement of dangerous blocks in tunnels by dynamically adjusting the length of anchor rods, and provides a new idea for the design of support parameters in the actual construction process of tunnels.

[0033] 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

[0034] The accompanying drawings constituting a part of the present disclosure are used to provide a further understanding of the present disclosure. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure.

[0035] Figure 1 is a flow chart of the method of the present invention;

[0036] Figure 2 It is a diagram of the discontinuous calculation model in this method;

[0037] Figure 3 This is the discontinuous calculation model diagram after adding the system anchor in this method;

[0038] Figure 4 This is the numerical calculation effect diagram after adding the system anchor in this method;

[0039] Figure 5 is a schematic diagram of dynamically adjusting the anchor rod length in this method;

[0040] Figure 6 Numerical calculation effect diagram after lengthening the anchor rod in this method. DETAILED DESCRIPTION

[0041] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present disclosure. 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 disclosure belongs.

[0042] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. 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.

[0043] In the absence of conflict, the embodiments in the present disclosure and the features in the embodiments may be combined with each other.

[0044] Embodiment 1

[0045] See attached Figure 1 As shown, this embodiment discloses a tunnel dangerous block identification and targeted reinforcement method based on discontinuous deformation analysis, including:

[0046] Establish a discontinuous computing model;

[0047] Discontinuous deformation calculation and analysis: Based on the above model, the discontinuous deformation analysis method is used to simulate the deformation and movement process of the surrounding rock blocks after the tunnel excavation is completed;

[0048] Real-time monitoring of vertical displacement of blocks: Real-time monitoring of the vertical displacement of each block. If it is greater than the set value, it is classified as a collapsed block, otherwise it is a safe block;

[0049] Dynamic correction of anchor length: According to the position of the collapsed block under the initial conditions, the system anchors that pass through the collapsed blocks are retrieved, and the length of this part of the anchors is gradually extended until all blocks are safe blocks. In this way, the length of the anchors is determined to achieve targeted reinforcement of dangerous blocks in the tunnel.

[0050] Among them, when establishing a non-continuous calculation model, according to the actual conditions of the simulated project, the information such as the occurrence of the structural surface, the distribution of ground stress, and the tunnel parameters are obtained. Then, based on this information, the fixed points, loading points, monitoring points, joint parameters, hole parameters, ground stress, system anchor parameters and other information of the calculation model are set to construct a non-continuous calculation model, input the command stream, and the calculation program automatically constructs the model by reading these command streams.

[0051] Since the structural surface is added when the model is automatically constructed, the entire calculation model is cut into many independent blocks, thus becoming a discontinuous calculation model. In the actual operation process, computer 3D software can be used for modeling. The above model can basically match the actual project, which is convenient for subsequent simulation to obtain deformation characteristics consistent with the actual situation, and meet the actual needs when determining the anchor rod in the future.

[0052] Figure 2 This is a numerical simulation model established based on actual engineering practices. The crooked lines here are the structural surfaces. Figure 3 and Figure 2 The only difference is that there is a circle of short lines above the tunnel, which represents the system anchor rods, and the length is the same.

[0053] Secondly, based on the discontinuous deformation analysis method, the deformation and movement process of the surrounding rock blocks after tunnel excavation are simulated by applying ground stress, and the vertical displacement of each block is monitored in real time. If it is greater than 50 mm, it is classified as a collapsed block, otherwise it is a safe block, and the dangerous block number (n1, n2,...nn) is recorded.

[0054] The discontinuous deformation analysis method is selected because it is currently the most suitable method for numerical simulation of block motion, and its calculation accuracy is higher than other methods (such as discrete element method, etc.).

[0055] In addition, when the vertical displacement of each block is monitored in real time: real-time monitoring is actually done by setting the coordinates of the monitoring point in the discontinuous calculation model during the numerical simulation by the calculation program, and using the calculation program to automatically monitor the displacement of this point in real time.

[0056] Figure 4This is the numerical simulation result diagram. It can be seen that block collapse will occur if only system anchor rods are added.

[0057] Then, according to the position of the collapsed block under the initial conditions, the system anchors (L1, L2, .. Ln) that pass through the collapsed block are retrieved, and the length of this part of the anchor is gradually extended (0.5m at a time) until all blocks are safe blocks. The length of the anchor is determined to achieve targeted reinforcement of the dangerous blocks in the tunnel.

[0058] The system anchors that pass through the collapsed blocks are retrieved mainly by calculating whether there are intersections between the boundary of the dangerous block and the anchors. If there are intersections, it means that the anchors pass through the dangerous blocks.

[0059] The above-mentioned anchor rod length is gradually extended: For the anchor rod that passes through the dangerous block:

[0060] For the first time, the length of such anchor rods is extended by 0.5m, and a numerical simulation is performed again. If the vertical displacement of the dangerous block is still greater than 50mm, the length of the anchor rod is extended by another 0.5m, and so on, until the vertical displacement of the dangerous block is less than 50mm.

[0061] Figure 5 It can be seen that some of the short lines on the tunnel have become longer. This is because the length of the anchor rods has been increased at the locations where there are dangerous blocks.

[0062] Because the function of the anchor rod is to reinforce the block. The existence of the anchor rod makes the stability of the block change, and the vertical displacement will be reduced. The longer the anchor rod, the more stable the block, and finally the block will not collapse and become a safe block.

[0063] Figure 6 After adjusting the length of the anchor rod and performing numerical simulation results, there will be no dangerous blocks in the tunnel.

[0064] Traditional anchor rods are all of the same length. This application takes into account the existence of dangerous blocks. For dangerous blocks, longer anchor rods need to be used for reinforcement, that is, targeted. The technical solution of the present invention specifically uses longer anchor rods for reinforcement of dangerous blocks.

[0065] The method for identifying and targetedly reinforcing dangerous blocks in tunnels based on discontinuous deformation analysis of the present invention solves the problem of identifying and reinforcing dangerous blocks in tunnels in discontinuous geological environments such as broken zones. Based on the discontinuous deformation analysis method, the deformation and movement process of surrounding rock blocks after tunnel excavation is simulated, and the vertical displacement of each block is monitored in real time to identify the position of dangerous blocks in the tunnel. By changing the length of the anchor rod, targeted reinforcement of dangerous blocks in the tunnel is achieved, providing a basis for the prevention and control of collapse disasters of dangerous blocks in the tunnel.

[0066] Embodiment 2

[0067] The purpose of this embodiment is to provide a computing device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above method when executing the program.

[0068] Embodiment 3

[0069] The purpose of this embodiment is to provide a computer-readable storage medium.

[0070] A computer-readable storage medium stores a computer program, which executes the steps of the above method when executed by a processor.

[0071] Embodiment 4

[0072] This embodiment discloses a tunnel dangerous block identification and targeted reinforcement system based on discontinuous deformation analysis, including:

[0073] The discontinuous calculation model building module is configured to: build a discontinuous calculation model according to actual conditions of the simulation project;

[0074] Add system anchors and obtain the initial length of the anchors;

[0075] The block division module is configured to: obtain initial position information of the block based on a discontinuous calculation model and apply ground stress;

[0076] According to the applied ground stress, the blocks are subjected to discontinuous deformation calculation and analysis, and the blocks are divided into collapsed blocks and safe blocks;

[0077] The targeted reinforcement module is configured as follows: for collapsed blocks, the length of the anchor rod at the location of the collapsed block is gradually extended based on the initial length of the anchor rod until all collapsed blocks are converted into safe blocks, and then the length of the anchor rod is determined to carry out targeted reinforcement of the collapsed blocks in the tunnel.

[0078] The steps involved in the apparatuses of the above embodiments 2, 3 and 4 correspond to the method embodiment 1, and the specific implementation methods can refer to the relevant description part of embodiment 1. The term "computer-readable storage medium" should be understood as a single medium or multiple media including one or more instruction sets; it should also be understood to include any medium that can store, encode or carry an instruction set for execution by a processor and enable the processor to execute any method in the present disclosure.

[0079] Those skilled in the art should understand that the modules or steps of the present disclosure can be implemented by a general computer device, or alternatively, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. The present disclosure is not limited to any specific combination of hardware and software.

[0080] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

[0081] Although the above describes the specific implementation methods of the present disclosure in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present disclosure. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present disclosure, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present disclosure.

Claims

1. A tunnel dangerous block identification and targeted reinforcement method based on discontinuous deformation analysis, characterized by: include: Construct a discontinuous calculation model based on the actual conditions of the simulation project; Add system anchors and obtain the initial length of the anchors; Based on the discontinuous calculation model, the initial position information of the block is obtained and the ground stress is applied; According to the applied ground stress, the blocks are subjected to discontinuous deformation calculation and analysis, and the blocks are divided into collapsed blocks and safe blocks; Dynamically adjust the anchor length for collapsed blocks: based on the initial length of the anchor, gradually extend the length of the anchor at the collapsed block until all collapsed blocks are converted into safe blocks. Then determine the length of the anchor and carry out targeted reinforcement of the collapsed blocks in the tunnel.

2. The method for identifying dangerous blocks in tunnels and targeted reinforcement based on discontinuous deformation analysis according to claim 1 is characterized in that: In the process of constructing the discontinuous calculation model, the occurrence of the structural surface, ground stress distribution, and tunnel parameter information of the actual project are obtained, and then converted into an input command stream based on the above information, and the model is automatically constructed by reading the command stream.

3. The method for identifying dangerous blocks in tunnels and targeted reinforcement based on discontinuous deformation analysis according to claim 1 is characterized in that: Constructing a non-continuous calculation model also includes: automatically constructing the model, adding structural surfaces, and cutting the entire calculation model into multiple independent blocks, thereby forming a non-continuous calculation model.

4. The method for identifying dangerous blocks in tunnels and targeted reinforcement based on discontinuous deformation analysis according to claim 1 is characterized in that: According to the applied ground stress, the block is subjected to discontinuous deformation calculation and analysis, specifically: The vertical displacement of the block is detected. If it is greater than the set value, it is classified as a collapsed block, otherwise it is a safe block.

5. The method for identifying dangerous blocks in tunnels and targeted reinforcement based on discontinuous deformation analysis according to claim 1 is characterized in that: When detecting the vertical displacement of the block, the monitoring point coordinates of the block are first set in the discontinuous calculation model. After applying the ground stress, the monitoring point coordinates of the block are obtained again, and the vertical displacement of the block is obtained by the difference between the two coordinates.

6. The method for identifying dangerous blocks in tunnels and targeted reinforcement based on discontinuous deformation analysis according to claim 1 is characterized in that: For collapsed blocks, the collapsed block number is recorded, and the anchor number that passes through the collapsed block under the initial conditions before the ground stress is applied to the block is determined.

7. The method for identifying dangerous blocks in tunnels and targeted reinforcement based on discontinuous deformation analysis according to claim 1 is characterized in that: On the basis of the initial length of the anchor rod, the length of the anchor rod at the collapsed block position is gradually extended, specifically: For the first time, the length of the anchor rod passing through the collapsed block is extended by the first threshold, and the numerical simulation is repeated to apply ground stress to the collapsed block and monitor the vertical displacement of the collapsed block. If the vertical displacement is still greater than the set value, the length of the anchor rod is further extended by the first threshold until the vertical displacement of each collapsed block is less than the set value.

8. A tunnel dangerous block identification and targeted reinforcement system based on discontinuous deformation analysis, characterized by: include: The discontinuous calculation model building module is configured to: build a discontinuous calculation model according to actual conditions of the simulation project; Add system anchors and obtain the initial length of the anchors; The block division module is configured to: obtain initial position information of the block based on a discontinuous calculation model and apply ground stress; According to the applied ground stress, the blocks are subjected to discontinuous deformation calculation and analysis, and the blocks are divided into collapsed blocks and safe blocks; The targeted reinforcement module is configured as follows: for collapsed blocks, the length of the anchor rod at the location of the collapsed block is gradually extended based on the initial length of the anchor rod until all collapsed blocks are converted into safe blocks, and then the length of the anchor rod is determined to carry out targeted reinforcement of the collapsed blocks in the tunnel.

9. A computing device comprising 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 of the method described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method described in any one of claims 1 to 7 are performed.

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