A method and system for collecting the stress at the end of the main control structural plane of a falling dangerous rock

Abstract

The present invention belongs to the technical field of dangerous rock stress acquisition, and relates to a method and a system for acquiring the stress at the end of the main control structural plane of a falling dangerous rock. The method includes the following steps: visualizing the stress distribution boundary at the end of the main control structural plane; presetting a plurality of stress monitoring points on the surface of the three-dimensional stress distribution boundary model; performing a Boolean operation on the three-dimensional stress distribution boundary model and the three-dimensional physical model of the mountain where the falling dangerous rock is located; setting the load loading conditions; obtaining the geometric characteristic parameters and material mechanics parameters of the three-dimensional physical model; performing multiple numerical simulations; obtaining the stress change trend and relationship model at each stress monitoring point according to the simulation results, and screening out the stress monitoring points as stress acquisition points according to the stress change trend; obtaining the output data of the stress acquisition induction device in real time; and calculating the stress at the end of the main control structural plane according to the output data and the relationship model. The present invention can be used to acquire the stress at the end of the main control structural plane of a falling dangerous rock.

Description

Technical Field

[0001] The present invention relates to the technical field of dangerous rock stress acquisition, and in particular, to a method and system for acquiring the stress at the end of the main control structural plane of a falling dangerous rock. Background Art

[0002] A dangerous rock refers to a rock mass located on a steep cliff or slope that is cut by rock mass structural planes and has poor stability under the action of inducing factors such as gravity, seismic force, and fissure water pressure. According to the instability mode, dangerous rocks can be divided into falling dangerous rocks, sliding dangerous rocks, and toppling dangerous rocks. Among them, the lower part of a falling dangerous rock is cut off from the mother rock by the structural plane, and the bottom is air-supported. In addition, the main control structural plane is the structural plane that plays a leading role in the stability of the dangerous rock. The main control structural plane of a falling dangerous rock is located at the top or rear. The main control structural plane at the top is nearly horizontal. Since the fracture structural planes at the rear are mostly in a through state and nearly vertical, the main control structural plane at the top is only subjected to the tensile stress generated by the self-weight of the dangerous rock. The main control structural plane at the rear is nearly vertical. Since the fracture structural planes at the top are mostly in a through state and nearly horizontal, the main control structural plane at the rear is subjected to the bending moment and shear stress generated by the self-weight of the dangerous rock.

[0003] As is well known, when the stress at the end of the main control structural plane exceeds the critical value, it will cause the expansion of the end of the main control structural plane, resulting in the instability of the dangerous rock. Therefore, obtaining the stress at the end of the main control structural plane is of great significance for analyzing the stability of the dangerous rock. At present, in actual engineering projects, stress acquisition induction devices are often used to acquire the stress at the end of the main control structural plane. The principle is that the rock mass near the end of the main control structural plane deforms under the action of external forces, causing a change in the signal strength of the stress acquisition induction device installed near the end of the main control structural plane, and then calculating the stress at the end of the main control structural plane. According to the above principle, it is not difficult to find that when the stress acquisition induction device acquires the stress, the rock mass near the end of the main control structural plane has already deformed, that is, the acquired stress data has hysteresis. However, the above structural characteristics of the falling dangerous rock make its collapse instantaneous. In other words, when the external force causes the stress at the end of the main control structural plane of the falling dangerous rock to exceed the critical value and cause the end to expand, it is very easy to cause the instantaneous collapse of the falling dangerous rock. In this case, even if the stress induction device acquires the stress at the end of the main control structural plane of the falling dangerous rock, this data cannot be used for the stability analysis of the falling dangerous rock. Summary of the Invention

[0004] The purpose of the present invention is to provide a method and system for acquiring the stress at the end of the main control structural plane of a falling dangerous rock, and the technical problem that can be solved is: the stress data at the end of the main control structural plane of the falling dangerous rock acquired by the stress acquisition induction device has hysteresis and is not suitable for the stability analysis of the falling dangerous rock.

[0005] The present invention is achieved by the following technical solutions:

[0006] In a first aspect, a method for collecting the stress at the end of the main control structural plane of a falling dangerous rock is proposed, including the following steps: visually processing the stress distribution boundary at the end of the main control structural plane to obtain a three-dimensional stress distribution boundary model; presetting a plurality of stress monitoring points on the surface of the three-dimensional stress distribution boundary model; performing a Boolean operation on the three-dimensional stress distribution boundary model with a plurality of stress monitoring points and the three-dimensional physical model of the mountain body to which the falling dangerous rock belongs to obtain a new three-dimensional physical model; obtaining the fracture type at the end of the main control structural plane; if the fracture type is type I, setting both the bending moment and the shear force in the load application condition to 0; if the fracture types of type I and type II coexist, setting the tensile stress in the load application condition to 0; obtaining the geometric characteristic parameters of the three-dimensional physical model and the material mechanics parameters of the falling dangerous rock; using the geometric characteristic parameters, the material mechanics parameters, the set load application condition and the new three-dimensional physical model to perform multiple numerical simulations to obtain multiple groups of simulation results; the numerical simulation is used to obtain the stress at the end of the main control structural plane and the stress at each stress monitoring point; obtaining the stress change trend at each stress monitoring point according to the multiple groups of simulation results, and screening out the stress monitoring point with the most significant stress change as the stress collection point according to the stress change trend; performing numerical fitting according to the multiple groups of simulation results to obtain a relationship model; in the relationship model, the stress at the end of the main control structural plane is the dependent variable, and the stress at the collection point is the independent variable; obtaining the output data of the stress collection sensing device in real time; the stress collection sensing device is installed at the stress collection point; calculating the stress at the end of the main control structural plane according to the output data and the relationship model.

[0007] Second aspect, a system for collecting the stress at the end of the main control structural plane of a falling dangerous rock is proposed, including: a visualization processing module, configured to perform visualization processing on the stress distribution boundary at the end of the main control structural plane to obtain a three-dimensional stress distribution boundary model; a point position presetting module, configured to preset a plurality of stress monitoring point positions on the surface of the three-dimensional stress distribution boundary model; a Boolean operation module, configured to perform a Boolean operation on the three-dimensional stress distribution boundary model with a plurality of stress monitoring point positions and the three-dimensional physical model of the mountain where the falling dangerous rock is located to obtain a new three-dimensional physical model; a data acquisition module, configured to acquire the fracture type at the end of the main control structural plane, the geometric feature parameters of the three-dimensional physical model, the material mechanics parameters of the falling dangerous rock, and the output data of the stress acquisition and induction device; the stress acquisition and induction device is installed at the stress acquisition point position; a load setting module, configured to, when the fracture type is type I, set both the bending moment and the shear force in the load application condition to 0; when the fracture types of type I and type II coexist, set the tensile stress in the load application condition to 0; a numerical simulation module, configured to perform multiple numerical simulations using the geometric feature parameters, the material mechanics parameters, the set load application condition, and the new three-dimensional physical model to obtain multiple groups of simulation results; the numerical simulation is used to acquire the stress at the end of the main control structural plane and the stress at each stress monitoring point position; a stress analysis module, configured to obtain the stress change trend at each stress monitoring point position according to the multiple groups of simulation results; a point position marking module, configured to screen out the stress monitoring point position with the most significant stress change as the stress acquisition point position according to the stress change trend; a numerical fitting module, configured to perform numerical fitting according to the multiple groups of simulation results to obtain a relationship model; in the relationship model, the stress at the end of the main control structural plane is the dependent variable, and the stress at the acquisition point position is the independent variable; a stress calculation module, configured to calculate the stress at the end of the main control structural plane according to the output data and the relationship model.

[0008] Third aspect, a computer device is provided, including a memory, a processor, and a transceiver that are communicatively connected in sequence, where the memory is configured to store a computer program, the transceiver is configured to transmit and receive data, and the processor is configured to read the computer program and execute a method for collecting the stress at the end of the main control structural plane of a falling dangerous rock as described in the first aspect.

[0009] Fourth aspect, a computer-readable storage medium is provided, and an instruction is stored on the computer-readable storage medium. When the instruction runs on a computer, it executes a method for collecting the stress at the end of the main control structural plane of a falling dangerous rock as described in the first aspect.

[0010] Fifth aspect, a computer program product including an instruction is provided. When the instruction runs on a computer, it causes the computer to execute a method for collecting the stress at the end of the main control structural plane of a falling dangerous rock as described in the first aspect. Description of the Drawings

[0011] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0012] Figure 1 It is a flowchart of a method for collecting the stress at the end of the main control structural plane of a falling dangerous rock provided by an embodiment of the present invention.

[0013] Figure 2 It is a system framework diagram of a method for collecting the stress at the end of the main control structural plane of a falling dangerous rock provided by an embodiment of the present invention. Detailed implementation manners

[0014] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the embodiments and the accompanying drawings. The illustrative embodiments and descriptions thereof of the present invention are only used to explain the present invention and do not limit the present invention.

[0015] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is obvious to those of ordinary skill in the art that the present invention does not have to employ these specific details. In other embodiments, well-known structures, circuits, materials or methods are not specifically described in order to avoid obscuring the present invention.

[0016] Throughout the specification, references to "one embodiment", "an embodiment", "an example" or "an example" mean that a particular feature, structure or characteristic described in connection with the embodiment or example is included in at least one embodiment of the present invention. Thus, the phrases "one embodiment", "an embodiment", "an example" or "an example" appearing throughout the specification do not necessarily all refer to the same embodiment or example. Furthermore, the specific features, structures or characteristics may be combined in any suitable combination and / or sub-combination in one or more embodiments or examples. In addition, those of ordinary skill in the art should understand that the diagrams provided herein are for illustrative purposes only and are not necessarily drawn to scale. The term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0017] In the description of the present invention, the orientation or positional relationship indicated by terms such as "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the protection scope of the present invention.

[0018] Embodiment: Since the stress data collected by the stress acquisition and induction device is based on the premise that the rock mass near the end of the main control structural plane has undergone deformation, the collected stress data has hysteresis. For a falling dangerous rock, if stress is collected near the end of the main control structural plane by using the stress acquisition and induction device, it indicates that the rock mass nearby has undergone deformation. If this deformation is sufficient to cause instantaneous collapse of the falling dangerous rock, the collected stress data is meaningless for analyzing the stability of the falling dangerous rock. In view of this, this embodiment proposes a method for collecting the stress at the end of the main control structural plane of a falling dangerous rock, and its purpose is to obtain stress before the deformation occurs at the end of the main control structural plane of the falling dangerous rock.

[0019] First, in combination with the structural characteristics of the falling dangerous rock, it can be analyzed that the main factors causing the stress change at the end of the main control structural plane come from external forces (such as fissure water pressure, seismic force, etc.); and the external forces are gradually transmitted from the far end to the end of the main control structural plane through the rock mass medium; this transmission process will cause changes in the internal stress distribution of the rock mass, and the closer to the end of the main control structural plane, the more significant the stress distribution change. This process has a chronological order in space and time. Therefore, in order to achieve the above purpose, this method is based on the chronological order characteristics and uses prediction or calculation methods to obtain the stress at the end of the main control structural plane. To achieve prediction or calculation, other stresses that have an internal relationship with the stress at the end of the main control structural plane need to be collected, and the stress at the end of the main control structural plane is predicted or calculated based on the collected other stresses; further, the stress monitoring points and collection methods of the other stresses need to be determined.

[0020] Regarding the problem of how to determine the stress monitoring points and collection methods of the other stresses, and how to predict or calculate the stress at the end of the main control structural plane through the collected other stresses, this embodiment will be elaborated in detail through the following specific implementation steps.

[0021] Affected by the end geometry, external load conditions, and rock mass material properties, the stress distribution characteristics at the end of the main control structural plane usually exhibit significant non-uniformity and complexity. Specifically, stress concentration effects usually occur at the end of the main control structural plane, forming a stress gradient from the inside out - at the geometric mutation of the end of the main control structural plane, the stress increases significantly; starting from the end of the main control structural plane and extending outward, as the distance increases, the stress concentration effect gradually decays, and finally the stress distribution tends to be uniform. It can be seen that there is an interface near the end of the main control structural plane that divides the significant change in stress distribution from the uniform stress distribution, that is, the stress distribution boundary. Looking from the opposite direction, when the external force is transmitted from the far end to the end of the main control structural plane through the rock mass medium, before entering the stress distribution boundary area, the influence of the external force on the stress distribution is weak, and after entering the stress distribution boundary area, the influence of the external force on the stress distribution increases, and the closer to the end of the main control structural plane, the more obvious the stress change. Therefore, the points on the stress distribution boundary can be regarded as the starting points for the external force to affect the stress distribution near the end of the main control structural plane, thereby causing the stress transmission effect within the stress distribution boundary area. Therefore, this method uses stress monitoring points to be arranged on the stress distribution boundary.

[0022] Based on the above description, a method for collecting the stress at the end of the main control structural plane of a falling dangerous rock proposed in the first aspect of this embodiment includes Figure 1 The following operating steps shown:

[0023] Step 1: Visualize the stress distribution boundary at the end of the main control structural plane to obtain a three-dimensional stress distribution boundary map.

[0024] It should be noted that before this step, the stress distribution boundary at the end of the main control structural plane needs to be determined first. The specific method is:

[0025] Step 1.1: Obtain the three-dimensional radar reflection map of the mountain where the falling dangerous rock is located.

[0026] The three-dimensional radar reflection map is a three-dimensional spatial distribution map of the target reflection signal obtained by the radar system, mainly used to display the position, shape, and reflection intensity of the target in three-dimensional space. Use the radar system (such as synthetic aperture radar SAR or ground penetrating radar GPR) to scan the mountain where the falling dangerous rock is located from multiple angles and multiple times, collect the reflection signals, perform signal preprocessing such as signal filtering and data alignment on the collected reflection signals, and convert the preprocessed signals into corresponding three-dimensional radar reflection maps through three-dimensional reconstruction techniques (such as back-projection algorithms, interferometric techniques, etc.). The shape of the falling dangerous rock and its mountain body (including the external overall shape and internal fracture shape) in the generated three-dimensional radar reflection map, as well as the position data and reflection intensity of each point that makes up the three-dimensional radar reflection map.

[0027] The purpose of this step is to collect the overall structural form and internal structural form of the falling dangerous rock mass and the mountain body where it is located, and obtain the position data of each point in the three-dimensional radar reflection map.

[0028] Step 1.2: Convert the three-dimensional radar reflection map into a corresponding three-dimensional physical model.

[0029] Use tools such as Blender, ParaView, or VTK to perform three-dimensional model reconstruction on the three-dimensional radar reflection map (including three-dimensional reconstruction methods based on point clouds, three-dimensional reconstruction methods based on voxels, or three-dimensional reconstruction methods based on two-dimensional slices) to obtain the corresponding three-dimensional physical model.

[0030] It should be added that, in order to facilitate the extraction of set feature parameters from the three-dimensional physical model, the three-dimensional radar reflection map and the three-dimensional physical model can also be optimized respectively. The specific method is as follows: After obtaining the three-dimensional radar reflection map of the mountain body where the falling dangerous rock mass is located, perform smoothing processing on the three-dimensional radar reflection map through Gaussian filtering or median filtering, and perform point cloud registration and coordinate data correction on the point cloud data in the smoothed three-dimensional radar reflection map. After converting the three-dimensional radar reflection map into a corresponding three-dimensional physical model, adjust the vertex distribution and connection relationship in the three-dimensional physical model in ANSYS according to the registered point cloud and coordinate data; enhance the geometric features of the adjusted three-dimensional physical model by using texture segmentation and texture feature extraction.

[0031] Step 1.3: Extract geometric feature parameters from the three-dimensional physical model.

[0032] The geometric feature parameters to be extracted at least include: the position of the rock mass, the width of the rock mass, the height of the rock mass, the thickness of the rock mass, the length of the main control structural plane, the dip angle of the main control structural plane, and the end position of the main control structural plane. The above geometric feature parameters can all be obtained by converting the position data of each point included in the three-dimensional radar reflection map. For example, the position of the rock mass can be represented by the center point position of the three-dimensional physical model, and the center point position corresponds to the center point position in the three-dimensional radar reflection map; the height of the rock mass can be obtained by extracting key points (the highest point and the lowest point) from the three-dimensional physical model and calculating the distance between the two points by using the position information of the corresponding points in the three-dimensional radar reflection map.

[0033] Step 1.4: Collect rock mass samples and analyze the material mechanics parameters of the rock mass by analyzing the rock mass samples.

[0034] The material mechanics parameters to be collected at least include: the density, elastic modulus, Poisson's ratio, tensile strength, and compressive strength of the rock mass. The above material mechanics parameters can be collected in advance by performing corresponding stress field experiments on the collected rock mass samples.

[0035] The purpose of performing the above-mentioned steps 1.2 to 1.4 is to conduct numerical simulations using three-dimensional physical models, geometric characteristic parameters, and material mechanics parameters.

[0036] Step 1.5: Conduct numerical simulations using three-dimensional physical models, geometric characteristic parameters, and material mechanics parameters to obtain the stress distribution boundary at the end of the main control structural plane.

[0037] The stress distribution boundary at the end of the main control structural plane can be achieved through numerical simulations. Based on the execution results of steps 1.2 to 1.4, first set the load application conditions, such as the magnitude and direction of tensile stress, the magnitude and direction of bending moment, the magnitude and direction of shear stress, the magnitude and direction of fissure water pressure, the magnitude and direction of seismic force, etc. The load application conditions can be set according to the environmental conditions of the falling dangerous rock. Then, based on the finite element analysis method, perform simulation calculations on finite element analysis software such as ANSYS, Abaqus, or COMSOL Multiphysics, and extract the simulation calculation results, that is, the stress distribution results at the end of the main control structural plane.

[0038] It should be noted that before performing simulation calculations using finite element analysis software, it is necessary to perform: mesh generation for the three-dimensional physical model; generate finite element meshes; use local mesh refinement in the area at the end of the main control structural plane to ensure the accuracy of stress distribution; select tetrahedral or hexahedral elements as the element type; check the mesh quality to avoid deformed elements; select the solver type (such as static analysis, dynamic analysis, nonlinear analysis, etc.); set the solution parameters (such as convergence criteria, number of iterations, etc.). Through numerical simulation technology, the stress distribution boundary at the end of the main control structural plane can be efficiently obtained, providing a reliable basis for structural design and optimization.

[0039] Step 2: Preset multiple stress acquisition points on the surface of the three-dimensional stress distribution boundary model.

[0040] In view of the fact that this method hopes to arrange stress monitoring points on the stress distribution boundary, taking the stress monitoring points as the starting points for the external force to affect the stress distribution near the end of the main control structural plane, and based on the stress transfer effect, predicting or calculating the stress at the end of the main control cabinet structural plane using the stress monitored at the stress monitoring points. Therefore, it is necessary to preset multiple stress monitoring points on the surface of the three-dimensional stress distribution boundary model. The following method for presetting stress monitoring points is provided in this embodiment:

[0041] Step 2.1: Perform meshing on the surface of the three-dimensional stress distribution boundary model.

[0042] Step 2.2: Preset multiple stress monitoring points on the surface of the three-dimensional stress distribution boundary model at intervals of one grid or multiple grids.

[0043] It should be noted that the position information of each stress monitoring point on the three-dimensional stress distribution boundary model can be correspondingly extracted from the three-dimensional radar reflection map obtained in Step 1.1.

[0044] Step 3: Perform a Boolean operation on the three-dimensional stress distribution boundary model with multiple stress monitoring points and the three-dimensional physical model of the mountain where the falling dangerous rock mass is located to obtain a new three-dimensional physical model.

[0045] The purpose of this step is to load the three-dimensional stress distribution boundary model with multiple stress monitoring points into the three-dimensional physical model of the mountain where the falling dangerous rock mass is located through Boolean operation, and make the two models overlap in the same three-dimensional space according to the corresponding relationship of the position data. The specific operations include: importing the two models into software (such as Blender, SolidWorks, Fusion 360 or AutoCAD); adjusting the positions of the models to align the two models; adding a Boolean modifier.

[0046] Step 4: Obtain the fracture type of the falling dangerous rock; if the fracture type is Type I, set both the bending moment and shear force in the load application conditions to 0; if the fracture type of the falling dangerous rock is a coexistence of Type I and Type II, set the tensile stress in the load application conditions to 0.

[0047] The fracture problems at the ends of the main control structural planes of the falling dangerous rock are divided into Type I fracture problems and fracture problems with the coexistence of Type I and Type II cracks. Type I fracture problems are the fracture problems at the ends of the cracks in the main control structural planes caused by the tensile stress generated only by the self-weight of the falling dangerous rock. The corresponding morphological characteristics of the dangerous rock are that the main control structural plane is located at the top of the dangerous rock and is nearly horizontal; the rear part of the dangerous rock is an unloading structural plane or a fracture structural plane, and most of them are in a basically penetrated state and are nearly vertical. The fracture problems with the coexistence of Type I and Type II cracks are the fracture problems at the ends of the cracks in the main control structural planes caused by the bending moment and shear force generated by the self-weight of the falling dangerous rock. The corresponding morphological characteristics of the dangerous rock are that the main control structural plane is located at the rear of the dangerous rock and is nearly vertical; the upper part of the dangerous rock is an unloading structural plane or a fracture structural plane, and most of them are in a basically penetrated state and are nearly horizontal.

[0048] The fracture problems at the ends of the main control structural planes of the falling dangerous rock can be judged by those skilled in the art according to the three-dimensional physical model. The fracture type of the falling dangerous rock obtained in this step is input by the user. When the judgment result is a Type I fracture problem, the user can input the value "0"; when the judgment result is a fracture problem with the coexistence of Type I and Type II cracks, the user can input the value "1". Of course, the user can freely define the expression form of the fracture type.

[0049] Step 5: Obtain the geometric characteristic parameters of the three-dimensional physical model and the material mechanical parameters of the falling dangerous rock.

[0050] Refer to Step 1.3 and Step 1.4.

[0051] Step 6: Perform multiple numerical simulations using the geometric feature parameters, material mechanics parameters, the set load loading conditions, and the new three-dimensional physical model to obtain multiple sets of simulation results.

[0052] The purpose of this step is to obtain the stress at the end of the main control structural plane and the stress at each stress monitoring point through numerical simulation. Each set of numerical simulation results includes the stress data at the end of the main control structural plane and the stress data at each stress monitoring point.

[0053] Similarly, set the load loading conditions, such as the magnitude and direction of tensile stress, the magnitude and direction of bending moment, the magnitude and direction of shear stress, the magnitude and direction of fissure water pressure, the magnitude and direction of seismic force, etc. The load loading conditions can be set according to the environmental conditions of the falling dangerous rock. Then, based on the finite element analysis method, perform simulation calculations on finite element analysis software such as ANSYS, Abaqus, or COMSOL Multiphysics, and extract the simulation calculation results.

[0054] Step 7: Fit the stress change trend at each stress monitoring point according to multiple sets of simulation results, and select the stress monitoring point with the most significant stress change as the stress acquisition point according to the stress change trend.

[0055] Step 8: Perform numerical fitting according to multiple sets of simulation results to obtain a relationship model.

[0056] In the relationship model, the stress at the end of the main control structural plane is the dependent variable, and the stress at the acquisition point is the independent variable.

[0057] Step 9: Real-time collect the output data of the stress acquisition sensing device.

[0058] The stress acquisition sensing device is installed at the stress acquisition point. The stress acquisition sensing device can be a strain gauge. The stress at the corresponding point is obtained by collecting the strain change of the corresponding point through the strain gauge. The stress acquisition device can be installed according to the following steps:

[0059] (1) According to the position information of the stress acquisition point, drill an installation hole at the corresponding position on the mountain body, and the depth of the installation hole penetrates into the mountain body inside the slip surface.

[0060] (2) Set the stress acquisition device in the installation hole and fix it.

[0061] Step 10: Calculate the stress at the end of the main control structural plane according to the output data and the relationship model.

[0062] Corresponding to the first aspect above, in the second aspect of this embodiment, a system for collecting the stress at the end of the main control structural plane of a falling dangerous rock is proposed, includingFigure 2 The following functional modules shown:

[0063] A visualization processing module for visualizing the stress distribution boundary at the end of the main control structural plane to obtain a three-dimensional stress distribution boundary model.

[0064] A point position presetting module for presetting a plurality of stress monitoring point positions on the surface of the three-dimensional stress distribution boundary model.

[0065] A Boolean operation module for performing a Boolean operation on the three-dimensional stress distribution boundary model with a plurality of stress monitoring point positions and the three-dimensional physical model of the mountain where the falling dangerous rock is located to obtain a new three-dimensional physical model.

[0066] A data acquisition module for acquiring the fracture type at the end of the main control structural plane, the geometric feature parameters of the three-dimensional physical model, the material mechanics parameters of the falling dangerous rock, and the output data of the stress acquisition and induction device.

[0067] The stress acquisition and induction device is installed at the stress acquisition point position.

[0068] A load setting module for setting both the bending moment and the shear force in the load loading condition to 0 when the fracture type is type I; and setting the tensile stress in the load loading condition to 0 when the fracture types of type I and type II coexist.

[0069] A numerical simulation module for performing multiple numerical simulations using the geometric feature parameters, the material mechanics parameters, the set load loading conditions, and the new three-dimensional physical model to obtain multiple groups of simulation results; the numerical simulation is used to obtain the stress at the end of the main control structural plane and the stress at each stress monitoring point position.

[0070] A stress analysis module for obtaining the stress change trend at each stress monitoring point position according to multiple groups of simulation results.

[0071] A point position marking module for screening out the stress monitoring point position with the most significant stress change as the stress acquisition point position according to the stress change trend.

[0072] A numerical fitting module for performing numerical fitting according to multiple groups of simulation results to obtain a relationship model; in the relationship model, the stress at the end of the main control structural plane is the dependent variable, and the stress at the acquisition point position is the independent variable.

[0073] A stress calculation module for calculating the stress at the end of the main control structural plane according to the output data and the relationship model.

[0074] Furthermore, the data acquisition module is also used to acquire the three-dimensional radar reflection map of the mountain where the falling dangerous rock mass is located; the numerical simulation module is also used to perform numerical simulation using the three-dimensional physical model, the geometric feature parameters, and the material mechanics parameters to obtain the stress distribution boundary at the end of the main control structural plane.

[0075] Further, the system further includes:

[0076] An image processing module, configured to convert a three-dimensional radar reflection map into a corresponding three-dimensional physical model.

[0077] A parameter extraction module, configured to extract geometric feature parameters from the three-dimensional physical model, and collect the material mechanics parameters of the rock mass by analyzing the rock mass samples. The geometric feature parameters include: the position of the rock mass, the width of the rock mass, the height of the rock mass, the thickness of the rock mass, the length of the main control structural plane, the dip angle of the main control structural plane, and the end position of the main control structural plane. The material mechanics parameters include: the density, elastic modulus, Poisson's ratio, tensile strength, and compressive strength of the rock mass.

[0078] Further, the image processing module is further configured to perform smoothing processing on the three-dimensional radar reflection map by means of Gaussian filtering or median filtering, and perform point cloud registration and coordinate data correction on the point cloud data in the smoothed three-dimensional radar reflection map.

[0079] Further, the system further includes: a model optimization module, configured to adjust the vertex distribution and connection relationship in the three-dimensional physical model in ANSYS according to the registered point cloud and coordinate data, and perform enhancement processing on the geometric features of the adjusted three-dimensional physical model by using texture segmentation and texture feature extraction.

[0080] Further, the point position presetting module includes: a model processing unit, configured to perform meshing processing on the surface of the three-dimensional stress distribution boundary model; a point position presetting unit, configured to preset a plurality of stress monitoring point positions on the surface of the three-dimensional stress distribution boundary model at intervals of one grid or multiple grids.

[0081] Based on the method provided in the first aspect and the system provided in the second aspect above, the third aspect of this embodiment provides a computer device that executes the method described in the first aspect or any method that may be related to the method described in the first aspect. The computer device includes a memory, a processor, and a transceiver that are communicatively connected in sequence. Among them, the memory is used to store computer programs, the transceiver is used to send and receive messages, and the processor is used to read the computer programs and execute the method described in the first aspect or any method that may be related to the method described in the first aspect. Specifically, for example, the memory may include, but is not limited to, random access memory (RAM), read-only memory (ROM), flash memory, first input first output (FIFO), and / or first input last output (FILO), etc.; the processor may be, but is not limited to, a microprocessor of the STM32F105 series. In addition, the computer device may also include, but is not limited to, a power module, a display screen, and other necessary components.

[0082] For the working process, working details, and technical effects of the foregoing computer device provided in the third aspect of this embodiment, reference may be made to the method described in the first aspect or any method that may be related to the method described in the first aspect, and details will not be repeated here.

[0083] The fourth aspect of this embodiment provides a computer-readable storage medium that stores a method as described in the first aspect or any method that may be related to the method described in the first aspect. That is, instructions are stored on the computer-readable storage medium, and when the instructions are run on a computer, the method described in the first aspect or any method that may be related to the method described in the first aspect is executed. Among them, the computer-readable storage medium refers to a carrier for storing data, and may include, but is not limited to, computer-readable storage media such as floppy disks, optical discs, hard disks, flash memories, USB flash drives, and / or memory sticks. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.

[0084] For the working process, working details, and technical effects of the foregoing computer-readable storage medium provided in the fourth aspect of this embodiment, reference may be made to the method described in the first aspect or any method that may be related to the method described in the first aspect, and details will not be repeated here.

[0085] A fifth aspect of this embodiment provides a computer program product including instructions that, when run on a computer, cause the computer to execute the method described in the first aspect or any method that may be involved as described in the first aspect. Among them, the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.

[0086] The specific embodiments described above have further elaborated on the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for collecting the stress at the end of the main control structural plane of a falling dangerous rock, characterized in that Including the following steps: Obtain the three-dimensional radar reflection map of the mountain where the falling dangerous rock mass is located; Convert the three-dimensional radar reflection map into a corresponding three-dimensional physical model; Extract geometric feature parameters from the three-dimensional physical model; Collect the material mechanics parameters of the rock mass by analyzing rock mass samples; Conduct numerical simulations using the three-dimensional physical model, geometric feature parameters, and material mechanics parameters to obtain the stress distribution boundary at the end of the main control structural plane; the stress distribution boundary is the interface that divides the significant change in stress distribution from the uniform stress distribution; Visualize the stress distribution boundary at the end of the main control structural plane to obtain a three-dimensional stress distribution boundary model; Preset multiple stress monitoring points on the surface of the three-dimensional stress distribution boundary model; Perform a Boolean operation on the three-dimensional stress distribution boundary model with multiple stress monitoring points and the three-dimensional physical model of the mountain where the falling dangerous rock is located to obtain a new three-dimensional physical model; Obtain the fracture type at the end of the main control structural plane; if the fracture type is type I, set both the bending moment and shear force in the load application conditions to 0; if the fracture types are type I and type II coexisting, set the tensile stress in the load application conditions to 0; Obtain the geometric feature parameters of the three-dimensional physical model and the material mechanics parameters of the falling dangerous rock mass; Conduct multiple numerical simulations using the geometric feature parameters, material mechanics parameters, set load application conditions, and the new three-dimensional physical model to obtain multiple groups of simulation results; the numerical simulations are used to obtain the stress at the end of the main control structural plane and the stress at each stress monitoring point; Obtain the stress change trend at each stress monitoring point according to multiple groups of simulation results, and screen out the stress monitoring point with the most significant stress change as the stress collection point according to the stress change trend; Conduct numerical fitting according to multiple groups of simulation results to obtain a relationship model; in the relationship model, the stress at the end of the main control structural plane is the dependent variable, and the stress at the collection point is the independent variable; Obtain the output data of the stress collection sensing device in real time; the stress collection sensing device is installed at the stress collection point; Calculate the stress at the end of the main control structural plane according to the output data and the relationship model.

2. The method for collecting the stress at the end of the main control structural plane of the falling dangerous rock according to claim 1, wherein, After obtaining the three-dimensional radar reflection map of the mountain where the falling dangerous rock mass is located, the following steps are further included: Smooth the three-dimensional radar reflection map through Gaussian filtering or median filtering; Perform point cloud registration and coordinate data correction on the point cloud data in the smoothed three-dimensional radar reflection map.

3. The method for collecting the stress at the end of the main control structural plane of a falling dangerous rock according to claim 2, characterized in that After converting the three-dimensional radar reflection map into a corresponding three-dimensional physical model, the following steps are further included: Adjust the vertex distribution and connection relationship in the three-dimensional physical model in the finite element analysis software ANSYS according to the registered point cloud and coordinate data; Enhance the geometric features of the adjusted three-dimensional physical model by using texture segmentation and texture feature extraction.

4. A method for collecting the stress at the end of the main control structural plane of a falling dangerous rock according to claim 1 or 2, characterized in that The geometric feature parameters include: rock mass position, rock mass width, rock mass height, rock mass thickness, main control structural plane length, main control structural plane inclination angle, and main control structural plane end position; the material mechanics parameters include: density, elastic modulus, Poisson's ratio, tensile strength, and compressive strength of the rock mass.

5. A method for collecting the stress at the end of the main control structural plane of a falling dangerous rock according to claim 1 or 2, characterized in that The method for presetting multiple stress monitoring points on the surface of the three-dimensional stress distribution boundary model is: Perform grid processing on the surface of the three-dimensional stress distribution boundary model; Preset a plurality of stress monitoring points on the surface of the three-dimensional stress distribution boundary model at intervals of one grid or multiple grids.

6. A system for collecting the stress at the end of the main control structural plane of a falling dangerous rock, characterized in that, Including: A visualization processing module for visualizing the stress distribution boundary at the end of the main control structural plane to obtain a three-dimensional stress distribution boundary model; A point position presetting module for presetting a plurality of stress monitoring points on the surface of the three-dimensional stress distribution boundary model; A Boolean operation module for performing a Boolean operation on the three-dimensional stress distribution boundary model with a plurality of stress monitoring points and the three-dimensional physical model of the mountain where the falling rock belongs to obtain a new three-dimensional physical model; A data acquisition module for acquiring the fracture type at the end of the main control structural plane, the geometric characteristic parameters of the three-dimensional physical model, the material mechanics parameters of the falling rock, and the output data of the stress acquisition and induction device; the stress acquisition and induction device is installed at the stress acquisition point position; A load setting module for setting both the bending moment and shear force in the load application condition to 0 when the fracture type is type I; when the fracture types of type I and type II coexist, setting the tensile stress in the load application condition to 0; A numerical simulation module for performing multiple numerical simulations using the geometric characteristic parameters, material mechanics parameters, the set load application conditions, and the new three-dimensional physical model to obtain multiple sets of simulation results; the numerical simulation is used to obtain the stress at the end of the main control structural plane and the stress at each stress monitoring point; A stress analysis module for obtaining the stress change trend at each stress monitoring point according to multiple sets of simulation results; A point position marking module for screening out the stress monitoring point with the most significant stress change as the stress acquisition point according to the stress change trend; A numerical fitting module for performing numerical fitting according to multiple sets of simulation results to obtain a relationship model; in the relationship model, the stress at the end of the main control structural plane is the dependent variable, and the stress at the acquisition point is the independent variable; A stress calculation module for calculating the stress at the end of the main control structural plane according to the output data and the relationship model; The data acquisition module is further used to acquire the three-dimensional radar reflection map of the mountain where the falling rock mass belongs; The numerical simulation module is further used to perform numerical simulation using the three-dimensional physical model, geometric characteristic parameters, and material mechanics parameters to obtain the stress distribution boundary at the end of the main control structural plane; the stress distribution boundary is an interface for dividing the significant stress distribution change and the uniform stress distribution; The system further includes: An image processing module for converting the three-dimensional radar reflection map into a corresponding three-dimensional physical model; A parameter extraction module for extracting geometric characteristic parameters from the three-dimensional physical model and collecting the material mechanics parameters of the rock mass by analyzing the rock mass samples; The geometric characteristic parameters include: the position of the rock mass, the width of the rock mass, the height of the rock mass, the thickness of the rock mass, the length of the main control structural plane, the dip angle of the main control structural plane, and the position of the end of the main control structural plane; The material mechanics parameters include: the density, elastic modulus, Poisson's ratio, tensile strength, and compressive strength of the rock mass.

7. The system for collecting the stress at the end of the main control structural plane of the falling rock according to claim 6, characterized in that The image processing module is also used to smooth the three-dimensional radar reflection map through Gaussian filtering or median filtering, and perform point cloud registration and coordinate data correction on the point cloud data in the smoothed three-dimensional radar reflection map; The system further includes: A model optimization module, which is used to adjust the vertex distribution and connection relationship in the three-dimensional physical model in the finite element analysis software ANSYS according to the registered point cloud and coordinate data, and enhance the geometric features of the adjusted three-dimensional physical model by using texture segmentation and texture feature extraction.

8. A system for collecting the stress at the end of the main control structural plane of a falling dangerous rock according to claim 6 or 7, characterized in that, The point position preset module includes: A model processing unit, which is used to perform meshing on the surface of the three-dimensional stress distribution boundary model; A point position preset unit, which is used to preset a plurality of stress monitoring point positions on the surface of the three-dimensional stress distribution boundary model at intervals of one grid or multiple grids.

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