Method and system for collecting falling type dangerous rock main control structural plane end stress

Abstract

The invention belongs to the technical field of dangerous rock stress collection, and relates to a method and system for collecting falling type dangerous rock main control structural surface end stress. Comprising the following steps: carrying out visualization processing on a stress distribution boundary at the end part of a main control structural surface; presetting a plurality of stress monitoring point positions on the surface of the three-dimensional stress distribution boundary model; boolean operation is carried out on the three-dimensional stress distribution boundary model and a three-dimensional physical model of a mountain body to which the falling type dangerous rock belongs; setting a load loading condition; geometric characteristic parameters and material mechanics parameters of the three-dimensional physical model are obtained; performing numerical simulation for multiple times; obtaining a stress change trend and a relation model at each stress monitoring point according to a simulation result, and screening out the stress monitoring point as a stress collection point according to the stress change trend; acquiring output data of the stress acquisition sensing device in real time; and converting the end stress of the main control structural plane according to the output data and the relation model. The device can be used for collecting the end stress of the falling type dangerous rock main control structural plane.

Description

Technical Field

[0001] The present invention relates to the technical field of dangerous rock stress collection, and in particular to a method and system for collecting stress at the end of a main control structure surface of a falling dangerous rock. Background Art

[0002] Dangerous rock refers to a rock block located on a steep cliff or steep slope that is cut by a rock structure surface and has poor stability under the influence of inducing factors such as gravity, seismic force, and fissure water pressure. According to the instability mode, dangerous rock can be divided into falling dangerous rock, sliding dangerous rock, and toppling dangerous rock. Among them, the lower part of the falling dangerous rock is cut off from the parent rock by the structure surface, and the bottom is exposed to the air. In addition, the main control structure surface is the structure surface that plays a leading role in the stability of the dangerous rock. The main control structure surface of the falling dangerous rock is located at the top or the back. The main control structure surface at the top is nearly horizontal. Since the fracture structure surface at the back is mostly in a through-state and nearly vertical, the main control structure surface at the top is only subject to the tensile stress generated by the deadweight of the dangerous rock; the main control structure surface at the back is nearly vertical. Since the fracture structure surface at the top is mostly in a through-state and nearly horizontal, the main control structure surface at the back is subject to the bending moment and shear stress generated by the deadweight of the dangerous rock.

[0003] As we all know, when the stress at the end of the main control structure exceeds the critical value, the end of the main control structure will expand, resulting in instability of the dangerous rock. Therefore, obtaining the stress at the end of the main control structure is of great significance for analyzing the stability of the dangerous rock. At present, in actual engineering projects, stress acquisition sensing devices are often used to collect the stress at the end of the main control structure. The principle is that the rock mass near the end of the main control structure is deformed by external force, causing the stress acquisition sensing device installed near the end of the main control structure to produce a signal strength change, and then the stress at the end of the main control structure is calculated. According to the above principle, it is not difficult to find that when the stress acquisition sensing device collects the stress, the rock mass near the end of the main control structure has already deformed, that is, the collected stress data has a lag. 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 structure of the falling dangerous rock to exceed the critical value and cause the end to expand, it is very easy to cause the falling dangerous rock to collapse instantly. In this case, even if the stress at the end of the main control structure surface of the falling dangerous rock is collected by using a stress sensing device, the data cannot be used for stability analysis of the falling dangerous rock. Summary of the invention

[0004] The purpose of the present invention is to propose a method and system for collecting stress at the end of the main control structure surface of a falling dangerous rock. The technical problem that can be solved is: the stress data at the end of the main control structure surface of a falling dangerous rock collected by a stress collection sensing device has hysteresis and is not suitable for stability analysis of falling dangerous rocks.

[0005] The present invention is achieved through the following technical solutions: In the first aspect, a method for collecting stress at the end of a main control structure surface of a falling dangerous rock is proposed, comprising the following steps: visualizing the stress distribution boundary at the end of the main control structure surface 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 Boolean operations on the three-dimensional stress distribution boundary model with a plurality of stress monitoring points and the three-dimensional physical model of the mountain 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 structure surface; if the fracture type is type I, setting the bending moment and shear force in the load loading condition to 0 at the same time; if the fracture type is a coexistence of type I and type II, setting the tensile stress in the load loading condition to 0; obtaining the geometric characteristic parameters of the three-dimensional physical model and the material mechanical parameters of the falling dangerous rock; and using Multiple numerical simulations are performed using geometric feature parameters, material mechanics parameters, set load loading conditions and a new three-dimensional physical model to obtain multiple groups of simulation results; numerical simulation is used to obtain the stress at the end of the main control structure surface and the stress at each stress monitoring point; the stress change trend at each stress monitoring point is obtained based on multiple groups of simulation results, and the stress monitoring points with the most significant stress changes are screened out as stress collection points based on the stress change trend; numerical fitting is performed based on multiple groups of simulation results to obtain a relationship model; in the relationship model, the stress at the end of the main control structure surface is the dependent variable, and the stress at the collection point is the independent variable; the output data of the stress collection sensing device is obtained in real time; the stress collection sensing device is installed at the stress collection point; the stress at the end of the main control structure surface is converted based on the output data and the relationship model.

[0006] In the second aspect, a system for collecting stress at the end of the main control structure surface of a falling dangerous rock is proposed, including: a visualization processing module, which is used to visualize the stress distribution boundary at the end of the main control structure surface to obtain a three-dimensional stress distribution boundary model; a point preset module, which is used to preset multiple stress monitoring points on the surface of the three-dimensional stress distribution boundary model; a Boolean operation module, which is used to perform Boolean operations on the three-dimensional stress distribution boundary model with multiple stress monitoring points and the three-dimensional physical model of the mountain to which the falling dangerous rock belongs, to obtain a new three-dimensional physical model; a data acquisition module, which is used to obtain the fracture type at the end of the main control structure surface, the geometric characteristic parameters of the three-dimensional physical model, the material mechanical parameters of the falling dangerous rock and the output data of the stress acquisition sensing device; the stress acquisition sensing device is installed at the stress acquisition point; a load setting module, which is used to set the bending moment and shear force in the load loading condition to 0 at the same time when the fracture type is type I; When the fracture types are type I and type II coexisting, the tensile stress in the load loading condition is set to 0; the numerical simulation module is used to perform multiple numerical simulations using geometric feature parameters, material mechanical parameters, set load loading conditions and a 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 structure surface and the stress at each stress monitoring point; the stress analysis module is used to obtain the stress change trend at each stress monitoring point according to multiple sets of simulation results; the point marking module is used to select the stress monitoring points with the most significant stress changes as stress collection points according to the stress change trend; the numerical fitting module is used to perform numerical fitting based on multiple sets of simulation results to obtain a relationship model; in the relationship model, the stress at the end of the main control structure surface is the dependent variable, and the stress at the collection point is the independent variable; the stress calculation module is used to convert the stress at the end of the main control structure surface according to the output data and the relationship model.

[0007] According to a third aspect, a computer device is provided, comprising a memory, a processor and a transceiver which are communicatively connected in sequence, wherein the memory is used to store a computer program, the transceiver is used to send and receive data, and the processor is used to read the computer program to execute a method for collecting stress at the end of a main control structure surface of a falling dangerous rock as described in the first aspect.

[0008] In a fourth aspect, a computer-readable storage medium is provided, on which instructions are stored. When the instructions are run on a computer, a method for collecting stress at the end of a main control structure surface of a falling dangerous rock as described in the first aspect is executed.

[0009] A fifth aspect provides a computer program product comprising instructions, which, when executed on a computer, causes the computer to execute a method for collecting stress at the end of a main control structure surface of a falling dangerous rock as described in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0011] Figure 1 A flow chart of a method for collecting stress at the end of a main control structure surface of a falling dangerous rock provided in an embodiment of the present invention.

[0012] Figure 2 A system framework diagram for collecting stress at the end of a main control structure surface of a falling dangerous rock provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0013] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0014] 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 apparent to one of ordinary skill in the art that these specific details are not necessarily employed to practice the present invention. In other embodiments, in order to avoid obscuring the present invention, well-known structures, circuits, materials, or methods are not specifically described.

[0015] Throughout the specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment," "an embodiment," "an example," or "an example" appearing in various places throughout the specification do not necessarily all refer to the same embodiment or example. In addition, particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. In addition, it will be appreciated by those of ordinary skill in the art that the figures provided herein are for illustrative purposes and that the figures are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0016] In the description of the present invention, the directions or positional relationships indicated by terms such as “front”, “rear”, “left”, “right”, “up”, “down”, “vertical”, “horizontal”, “high”, “low”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0017] Embodiment: Since the stress data collected by the stress collection sensing device is based on the premise that the rock mass near the end of the main control structure surface has been deformed, the collected stress data has a lag; for falling dangerous rocks, if the stress is collected near the end of the main control structure surface by the stress collection sensing device, it means that the rock mass near it has been deformed. If the deformation is sufficient to cause the falling dangerous rock to collapse instantly, 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 stress at the end of the main control structure surface of a falling dangerous rock, the purpose of which is to obtain stress before the end of the main control structure surface of the falling dangerous rock is deformed.

[0018] First, combined with the structural characteristics of falling dangerous rocks, it can be analyzed that the main factors causing stress changes at the end of the main control structure surface come from external forces (such as fissure water pressure, seismic force, etc.); and the external force is gradually transmitted from the far end to the end of the main control structure surface through the rock medium; this transmission process will cause changes in the stress distribution inside the rock mass, and the closer to the end of the main control structure surface, the more significant the stress distribution change, and this process has a spatial and temporal sequence. Therefore, in order to achieve the above purpose, this method uses prediction or calculation to obtain the stress at the end of the main control structure surface based on the characteristics of temporal sequence. In order to achieve prediction or calculation, it is necessary to collect other stresses that are intrinsically related to the stress at the end of the main control structure surface, and predict or calculate the stress at the end of the main control structure surface based on the other stresses collected; further, it is necessary to clarify the stress monitoring points and collection methods of the other stresses.

[0019] Regarding the issues of how to determine the stress monitoring points and collection methods of the other stresses, and how to predict or infer the stress at the end of the main control structure surface through the collected other stresses, this embodiment will be elaborated in detail through the following specific implementation steps.

[0020] Affected by the end geometry, external load conditions and rock material properties, the stress distribution characteristics at the end of the main control surface usually show significant non-uniformity and complexity. Specifically, stress concentration effects usually occur at the end of the main control surface, and a stress gradient from the inside to the outside is formed. At the geometric mutation point at the end of the main control surface, the stress increases significantly. Starting from the end of the main control surface and extending outward, the stress concentration effect gradually decays with the increase of distance, and the stress distribution eventually tends to be uniform. It can be seen that there is an interface near the end of the main control surface that divides the stress distribution change significantly and the stress distribution uniformly, namely the stress distribution boundary. From the opposite direction, when the external force is transmitted from the far end to the end of the main control surface through the rock medium, before entering the stress distribution boundary area, the influence of the external force on the stress distribution is weak. After entering the stress distribution boundary area, the influence of the external force on the stress distribution is enhanced, and the closer to the end of the main control surface, the more obvious the stress change. Therefore, the point on the stress distribution boundary can be regarded as the starting point of the external force affecting the stress distribution near the end of the main control surface, which then causes the stress transfer effect in the stress distribution boundary area. Therefore, this method arranges stress monitoring points on the stress distribution boundary.

[0021] Based on the above description, a method for collecting stress at the end of a main control structure surface of a falling dangerous rock is proposed in the first aspect of this embodiment, comprising: Figure 1 The following steps are shown: Step 1: Visualize the stress distribution boundary at the end of the main control structure surface to obtain a three-dimensional stress distribution boundary map.

[0022] It should be noted that before this step, the stress distribution boundary at the end of the main control structure surface needs to be determined. The specific method is: Step 1.1: Obtain a three-dimensional radar reflection map of the mountain to which the falling dangerous rock mass belongs.

[0023] The three-dimensional radar reflection map is a three-dimensional spatial distribution map of the target reflection signal obtained by the radar system, which is mainly used to display the position, shape and reflection intensity of the target in three-dimensional space. The radar system (such as synthetic aperture radar SAR or ground penetrating radar GPR) is used to scan the mountain where the fallen dangerous rock is located multiple times from multiple angles, collect reflection signals, perform signal preprocessing such as signal filtering and data alignment on the collected reflection signals, and convert the preprocessed signals into the corresponding three-dimensional radar reflection map through three-dimensional reconstruction technology (such as back projection algorithm, interferometry technology, etc.). The generated three-dimensional radar reflection map contains the shape of the fallen dangerous rock and the mountain where it is located (including the external overall shape and the internal crack shape), as well as the position data and reflection intensity of the points that make up the three-dimensional radar reflection map.

[0024] The purpose of this step is to collect the overall structural morphology and internal structural morphology of the fallen dangerous rock mass and the mountain where it is located, and to obtain the position data of each point in the three-dimensional radar reflection map.

[0025] Step 1.2: Convert the 3D radar reflection map into the corresponding 3D physical model.

[0026] Use tools such as Blender, ParaView or VTK to reconstruct the 3D model of the 3D radar reflection image (including 3D reconstruction method based on point cloud, 3D reconstruction method based on voxel or 3D reconstruction method based on two-dimensional slice) to obtain the corresponding 3D physical model.

[0027] It should be added that in order to facilitate the extraction of collective feature parameters from the three-dimensional physical model, the three-dimensional radar reflection map and the three-dimensional physical model can also be optimized separately. The specific method is: after obtaining the three-dimensional radar reflection map of the mountain to which the falling dangerous rock mass belongs, the three-dimensional radar reflection map is smoothed by Gaussian filtering or median filtering, and the point cloud data in the smoothed three-dimensional radar reflection map is point cloud registered and coordinate data corrected. After converting the three-dimensional radar reflection map into the corresponding three-dimensional physical model, the vertex distribution and connection relationship in the three-dimensional physical model are adjusted in ANSYS according to the registered point cloud and coordinate data; the geometric features of the adjusted three-dimensional physical model are enhanced by texture segmentation and texture feature extraction.

[0028] Step 1.3: Extract geometric feature parameters from the 3D physical model.

[0029] The geometric characteristic parameters to be extracted include at least: rock mass position, rock mass width, rock mass height, rock mass thickness, main control structure surface length, main control structure surface inclination and main control structure surface end position. The above geometric characteristic parameters can be converted by the position data of each point contained in the three-dimensional radar reflection map. For example, the rock mass position 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 of the three-dimensional radar reflection map; the rock mass height can be calculated by extracting key points (highest point and lowest point) from the three-dimensional physical model and using the position information of the corresponding points in the three-dimensional radar reflection map. The distance between the two points.

[0030] Step 1.4: Collect rock samples and collect material mechanical parameters of the rock by analyzing the rock samples.

[0031] The material mechanical parameters to be collected include at least: density, elastic modulus, Poisson's ratio, tensile strength and compressive strength of the rock mass. The above material mechanical parameters can be collected in advance by conducting corresponding stress field experiments on the collected rock mass samples.

[0032] The purpose of executing the above steps 1.2 to 1.4 is to perform numerical simulation using a three-dimensional physical model, geometric characteristic parameters and material mechanical parameters.

[0033] Step 1.5: Use the three-dimensional physical model, geometric characteristic parameters and material mechanical parameters to perform numerical simulation to obtain the stress distribution boundary at the end of the main control structure surface.

[0034] The stress distribution boundary at the end of the main control structure surface can be realized by numerical simulation. Based on the execution results of steps 1.2 to 1.4, first 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 fracture 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, and then based on the finite element analysis method, perform simulation calculations on the finite element analysis software ANSYS, Abaqus or COMSOL Multiphysics, and extract the simulation calculation results, that is, the stress distribution results at the end of the main control structure surface.

[0035] It should be noted that before using finite element analysis software for simulation calculation, it is necessary to perform the following: meshing of the three-dimensional physical model; generating finite element meshes; using local mesh encryption in the end area of ​​the main control structure surface to ensure the accuracy of stress distribution; selecting tetrahedron or hexahedron elements as the element type; checking the mesh quality to avoid deformed elements; selecting the solver type (such as static analysis, dynamic analysis, nonlinear analysis, etc.); setting the solution parameters (such as convergence criteria, number of iterations, etc.). Numerical simulation technology can efficiently obtain the stress distribution boundary at the end of the main control structure surface and provide a reliable basis for structural design and optimization.

[0036] Step 2: Preset multiple stress collection points on the surface of the three-dimensional stress distribution boundary model.

[0037] In view of the fact that this method hopes to arrange stress monitoring points on the stress distribution boundary, the stress monitoring points are used as the starting points of the stress distribution near the end of the main control structure surface affected by external forces, and based on the stress transfer effect, the stress monitored at the stress monitoring points is used to predict or calculate the stress at the end of the main control cabinet structure surface. Therefore, it is necessary to preset multiple stress monitoring points on the surface of the three-dimensional stress distribution boundary model. This embodiment provides the following method for presetting stress monitoring points: Step 2.1: Mesh the surface of the three-dimensional stress distribution boundary model.

[0038] 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.

[0039] 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.

[0040] Step 3: Perform Boolean operations on the three-dimensional stress distribution boundary model with multiple stress monitoring points and the three-dimensional physical model of the mountain to which the falling dangerous rock mass belongs, and obtain a new three-dimensional physical model.

[0041] 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 to which the falling dangerous rock mass belongs through Boolean operations, and to overlap the two models 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 model positions to align the two models; and adding Boolean modifiers.

[0042] Step 4: Obtain the fracture type of the falling dangerous rock; if the fracture type is type I, set the bending moment and shear force in the load loading condition to 0 at the same time; 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 loading condition to 0.

[0043] The fracture problem at the end of the main control structure surface of the falling dangerous rock is divided into type I fracture problem and fracture problem with coexistence of type I and type II cracks. Type I fracture problem is caused by the main control structure surface of the falling dangerous rock being only subjected to the tensile stress generated by the deadweight of the dangerous rock, and the corresponding dangerous rock morphological characteristics are that the main control structure surface is located at the top of the dangerous rock, nearly horizontal; the rear of the dangerous rock is a unloading structure surface or a fracture structure surface, most of which are in a basically continuous state and nearly vertical. The fracture problem with coexistence of type I and type II cracks is caused by the main control structure surface of the falling dangerous rock being subjected to the bending moment and shear force generated by the deadweight of the dangerous rock, and the corresponding dangerous rock morphological characteristics are that the main control structure surface is located at the rear of the dangerous rock, nearly vertical; the upper part of the dangerous rock is a unloading structure surface or a fracture structure surface, most of which are in a basically continuous state and nearly horizontal.

[0044] The fracture problem at the end of the main control structure surface of the falling dangerous rock can be determined by technicians in this field based on 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 enter the value "0"; when the judgment result is a fracture problem with the coexistence of type I and type II cracks, the user can enter the value "1". Of course, the user can freely define the expression form of the fracture type.

[0045] Step 5: Obtain the geometric characteristic parameters of the three-dimensional physical model and the material mechanical parameters of the falling dangerous rock.

[0046] Refer to step 1.3 and step 1.4.

[0047] Step 6: Use the geometric feature parameters, material mechanical parameters, the set load loading conditions and the new three-dimensional physical model to perform multiple numerical simulations to obtain multiple sets of simulation results.

[0048] The purpose of this step is to obtain the stress at the end of the main control structure surface and the stress at each stress monitoring point through numerical simulation. Each set of numerical simulation results contains the stress data at the end of the main control structure surface and the stress data at each stress monitoring point.

[0049] Similarly, the load loading conditions are set, 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, and then based on the finite element analysis method, simulation calculations are performed on the finite element analysis software ANSYS, Abaqus or COMSOL Multiphysics to extract the simulation calculation results.

[0050] Step 7: Fit the stress change trend at each stress monitoring point based on multiple groups of simulation results, and select the stress monitoring point with the most significant stress change as the stress collection point based on the stress change trend.

[0051] Step 8: Perform numerical fitting based on multiple sets of simulation results to obtain a relationship model.

[0052] In the relationship model, the stress at the end of the main control structure surface is the dependent variable, and the stress at the collection point is the independent variable.

[0053] Step 9: Collect the output data of the stress collection sensing device in real time.

[0054] The stress collection sensing device is installed at the stress collection point. The stress collection sensing device can use strain gauges to collect the strain at the corresponding point and calculate the corresponding stress. The stress collection device can be installed according to the following steps: (1) According to the location information of the stress collection point, an installation hole is drilled at the corresponding position on the mountain, and the depth of the installation hole is deep into the mountain inside the slip surface.

[0055] (2) The stress collection device is placed in the mounting hole and fixed.

[0056] Step 10: Calculate the end stress of the main control structure surface based on the output data and the relationship model.

[0057] Corresponding to the first aspect, the second aspect of this embodiment provides a system for collecting stress at the end of the main control structure surface of a falling dangerous rock, comprising: Figure 2The following functional modules are shown: The visualization processing module is used to visualize the stress distribution boundary at the end of the main control structure surface to obtain a three-dimensional stress distribution boundary model.

[0058] The point preset module is used to preset multiple stress monitoring points on the surface of the three-dimensional stress distribution boundary model.

[0059] The Boolean operation module is used to perform Boolean operation on the three-dimensional stress distribution boundary model with multiple stress monitoring points and the three-dimensional physical model of the mountain to which the falling dangerous rock belongs, so as to obtain a new three-dimensional physical model.

[0060] The data acquisition module is used to obtain the fracture type at the end of the main control structure surface, the geometric characteristic parameters of the three-dimensional physical model, the material mechanical parameters of the falling dangerous rock and the output data of the stress acquisition sensing device.

[0061] The stress collection sensing device is installed at the stress collection point.

[0062] The load setting module is used to set the bending moment and shear force in the load loading condition to 0 at the same time when the fracture type is type I; when the fracture type is both type I and type II, the tensile stress in the load loading condition is set to 0.

[0063] The numerical simulation module is used to perform multiple numerical simulations using geometric feature parameters, material mechanical parameters, set load loading conditions and a 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 structure surface and the stress at each stress monitoring point.

[0064] The stress analysis module is used to obtain the stress change trend at each stress monitoring point based on multiple groups of simulation results.

[0065] The point marking module is used to select the stress monitoring points with the most significant stress changes as stress collection points according to the stress change trend.

[0066] The numerical fitting module is used to perform numerical fitting based on multiple groups of simulation results to obtain a relationship model; in the relationship model, the stress at the end of the main control structure surface is the dependent variable, and the stress at the collection point is the independent variable.

[0067] The stress calculation module is used to convert the stress at the end of the main control structure surface according to the output data and the relationship model.

[0068] Furthermore, the data acquisition module is also used to obtain the three-dimensional radar reflection map of the mountain to which the falling dangerous rock mass belongs; the numerical simulation module is also 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 structure surface.

[0069] Furthermore, the system also includes: The image processing module is used to convert the three-dimensional radar reflection image into a corresponding three-dimensional physical model.

[0070] The parameter extraction module is used to extract geometric characteristic parameters from the three-dimensional physical model and collect the material mechanical parameters of the rock mass by analyzing the rock mass samples. The geometric characteristic parameters include: rock mass position, rock mass width, rock mass height, rock mass thickness, main control structure surface length, main control structure surface inclination and main control structure surface end position. The material mechanical parameters include: rock mass density, elastic modulus, Poisson's ratio, tensile strength and compressive strength.

[0071] Furthermore, the image processing module is also used to smooth the three-dimensional radar reflection image 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 image.

[0072] Furthermore, the system also includes: a model optimization module, which is used to adjust the vertex distribution and connection relationship in the three-dimensional physical model in ANSYS according to the aligned 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.

[0073] Furthermore, the point preset module includes: a model processing unit, which is used to grid the surface of the three-dimensional stress distribution boundary model; and a point preset unit, which is used to preset multiple stress monitoring points on the surface of the three-dimensional stress distribution boundary model at intervals of one grid or multiple grids.

[0074] Based on the method provided in the first aspect and the system provided in the second aspect, the third aspect of this embodiment provides a computer device for executing the method described in the first aspect or any method that may be involved in the method described in the first aspect, including a memory, a processor and a transceiver that are sequentially connected in communication, wherein the memory is used to store a computer program, the transceiver is used to send and receive messages, and the processor is used to read the computer program to execute the method described in the first aspect or any method that may be involved in the method described in the first aspect. For example, the memory may include, but is not limited to, a random access memory (Random-Access Memory, RAM), a read-only memory (Read-Only Memory, ROM), a flash memory (FlashMemory), a first-in-first-out memory (First Input First Output, FIFO) and / or a first-in-last-out memory (First Input Last Output, FILO), etc.; the processor may include, 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.

[0075] The working process, working details and technical effects of the aforementioned computer device provided in the third aspect of this embodiment can be referred to the method described in the first aspect or any method that may be involved in the first aspect, and will not be described in detail here.

[0076] The fourth aspect of this embodiment provides a computer-readable storage medium that stores the method described in the first aspect or any method that may be related to the method described in the first aspect, that is, the computer-readable storage medium stores instructions, and when the instructions are executed 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. The computer-readable storage medium refers to a carrier for storing data, which may include but is not limited to computer-readable storage media such as floppy disks, optical disks, hard disks, flash memories, USB flash drives, and / or memory sticks, and the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.

[0077] The working process, working details and technical effects of the aforementioned computer-readable storage medium provided in the fourth aspect of this embodiment can be referred to the method described in the first aspect or any method that may be related to the method described in the first aspect, and will not be repeated here.

[0078] In a fifth aspect, the present embodiment provides a computer program product comprising instructions, which, when executed on a computer, causes the computer to execute the method described in the first aspect or any method that may be related to the method described in the first aspect. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device.

[0079] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for collecting stress at the end of a main control structure surface of a falling dangerous rock, characterized in that: The following steps are involved: Visualize the stress distribution boundary at the end of the main control structure surface 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 Boolean operations on the three-dimensional stress distribution boundary model with multiple stress monitoring points and the three-dimensional physical model of the mountain to which the falling dangerous rock belongs, and obtain a new three-dimensional physical model; Get the fracture type of the main control structure surface end; if the fracture type is type I, set the bending moment and shear force in the load loading condition to 0 at the same time; if the fracture type is both type I and type II, set the tensile stress in the load loading condition to 0; Obtaining geometric characteristic parameters of the three-dimensional physical model and material mechanical parameters of the falling dangerous rock; Multiple numerical simulations are performed using geometric characteristic parameters, material mechanical parameters, set load conditions and new three-dimensional physical models to obtain multiple sets of simulation results; numerical simulations are used to obtain the stress at the end of the main control structure surface and the stress at each stress monitoring point; The stress change trend at each stress monitoring point is obtained based on multiple groups of simulation results, and the stress monitoring point with the most significant stress change is selected as the stress collection point according to the stress change trend; Numerical fitting is performed based on multiple sets of simulation results to obtain a relationship model; in the relationship model, the stress at the end of the main control structure surface is the dependent variable, and the stress at the collection point is the independent variable; The output data of the stress collection sensing device is obtained in real time; the stress collection sensing device is installed at the stress collection point; The end stress of the main control structure surface is converted based on the output data and the relationship model.

2. A method for collecting stress at the end of the main control structure surface of a falling dangerous rock according to claim 1, characterized in that: Before visualizing the stress distribution boundary at the end of the main control structure surface, the following steps are also included: Obtain a three-dimensional radar reflection map of the mountain to which the falling dangerous rock mass belongs; 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 material mechanical parameters of rock mass by analyzing rock samples; The stress distribution boundary at the end of the main control structure surface is obtained by numerical simulation using a three-dimensional physical model, geometric characteristic parameters and material mechanics parameters.

3. A method for collecting stress at the end of the main control structure surface of a falling dangerous rock according to claim 2, characterized in that: After obtaining the three-dimensional radar reflection map of the mountain to which the falling dangerous rock mass belongs, the following steps are also included: Smoothing the three-dimensional radar reflection image by Gaussian filtering or median filtering; Point cloud registration and coordinate data correction are performed on the point cloud data in the smoothed three-dimensional radar reflection map.

4. A method for collecting stress at the end of the main control structure surface of a falling dangerous rock according to claim 3, characterized in that: After converting the 3D radar reflection map into the corresponding 3D physical model, the following steps are also included: According to the registered point cloud and coordinate data, the vertex distribution and connection relationship in the 3D physical model are adjusted in the finite element analysis software ANSYS; The geometric features of the adjusted 3D physical model are enhanced using texture segmentation and texture feature extraction.

5. A method for collecting stress at the end of the main control structure surface of a falling dangerous rock according to claim 2 or 3, characterized in that: The geometric characteristic parameters include: rock mass position, rock mass width, rock mass height, rock mass thickness, main controlling structural surface length, main controlling structural surface inclination and main controlling structural surface end position; the material mechanical parameters include: rock mass density, elastic modulus, Poisson's ratio, tensile strength and compressive strength.

6. A method for collecting stress at the end of a main control structure surface of a falling dangerous rock according to any one of claims 1 to 3, characterized in that: The method for presetting multiple stress monitoring points on the surface of a three-dimensional stress distribution boundary model is: Meshing the surface of the three-dimensional stress distribution boundary model; A plurality of stress monitoring points are preset on the surface of the three-dimensional stress distribution boundary model in a manner of being spaced apart by one grid or multiple grids.

7. A system for collecting stress at the end of the main control structure surface of a falling dangerous rock, characterized in that: include: A visualization processing module is used to visualize the stress distribution boundary at the end of the main control structure surface to obtain a three-dimensional stress distribution boundary model; A point preset module is used to preset multiple stress monitoring points on the surface of a three-dimensional stress distribution boundary model; A Boolean operation module is used to perform Boolean operations on a three-dimensional stress distribution boundary model with multiple stress monitoring points and a three-dimensional physical model of the mountain to which the falling dangerous rock belongs, so as to obtain a new three-dimensional physical model; The data acquisition module is used to obtain the fracture type at the end of the main control structure surface, the geometric characteristic parameters of the three-dimensional physical model, the material mechanical parameters of the falling dangerous rock, and the output data of the stress acquisition sensing device; the stress acquisition sensing device is installed at the stress acquisition point; The load setting module is used to set the bending moment and shear force in the load loading condition to 0 at the same time when the fracture type is type I; when the fracture type is both type I and type II, the tensile stress in the load loading condition is set to 0; The numerical simulation module is used to perform multiple numerical simulations using geometric characteristic parameters, material mechanical parameters, set load loading conditions and a 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 structure surface and the stress at each stress monitoring point; The stress analysis module is used to obtain the stress change trend at each stress monitoring point based on multiple sets of simulation results; The point marking module is used to select the stress monitoring points with the most significant stress changes as stress collection points according to the stress change trend; A numerical fitting module is used to perform numerical fitting based on multiple sets of simulation results to obtain a relationship model; in the relationship model, the stress at the end of the main control structure surface is the dependent variable, and the stress at the collection point is the independent variable; The stress calculation module is used to convert the stress at the end of the main control structure surface according to the output data and the relationship model.

8. A system for collecting stress at the end of the main control structure surface of a falling dangerous rock according to claim 7, characterized in that: The data acquisition module is also used to obtain a three-dimensional radar reflection map of the mountain to which the falling dangerous rock mass belongs; The numerical simulation module is also used to perform numerical simulation using a three-dimensional physical model, geometric characteristic parameters and material mechanical parameters to obtain the stress distribution boundary at the end of the main control structure surface; The system further comprises: An image processing module, used to convert the three-dimensional radar reflection image into a corresponding three-dimensional physical model; Parameter extraction module, used to extract geometric characteristic parameters from the three-dimensional physical model, and collect material mechanical parameters of the rock mass by analyzing rock samples; The geometric characteristic parameters include: rock mass position, rock mass width, rock mass height, rock mass thickness, main control structure surface length, main control structure surface inclination and main control structure surface end position; Material mechanical parameters include: density, elastic modulus, Poisson's ratio, tensile strength and compressive strength of rock mass.

9. A system for collecting stress at the end of the main control structure surface of a falling dangerous rock according to claim 8, characterized in that: The image processing module is also used to smooth the three-dimensional radar reflection image 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 image; The system further comprises: The model optimization module 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.

10. A system for collecting stress at the end of a main control structure surface of a falling dangerous rock according to any one of claims 7 to 9, characterized in that: The point preset module includes: A model processing unit, used for meshing the surface of a three-dimensional stress distribution boundary model; The point preset unit is used to preset multiple stress monitoring points on the surface of the three-dimensional stress distribution boundary model in a manner of one grid or multiple grids apart.

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