Testing method and device for three-dimensional mining stress of surrounding rock in coal mine tunnel

Abstract

The present invention provides a method and device for testing three-dimensional mining stress of surrounding rock of coal mine tunnels, comprising: based on multiple groups of model construction parameters, taking compressive stress-volume strain benchmark change information as a standard, constructing a single-unit uniaxial compression model, wherein the compressive stress-volume strain benchmark change information is determined based on the compressive stress-volume strain benchmark curve of the rock mass in the goaf; based on the single-unit uniaxial compression model and three-dimensional information of the surrounding rock of the coal mine tunnel, constructing a rock mass constitutive model within the collapse zone, so as to test the dynamic evolution information of the three-dimensional stress of the tunnel surrounding rock according to the rock mass constitutive model within the collapse zone.

Description

Technical Field

[0001] The invention relates to the technical field of coal exploration, and in particular to a method and a device for testing three-dimensional mining stress of surrounding rocks in a coal mine tunnel. Background Art

[0002] Various complex and difficult tunnels are emerging, such as tunnels with extremely soft and extremely broken surrounding rocks, tunnels with strong dynamic pressure, such as tunnels along the goaf, tunnels left along the goaf, reused tunnels, etc., deep well tunnels, rock burst tunnels, etc. The surrounding rocks of tunnels with complex geological conditions have the characteristics of poor stability, strong deformation and damage, which has become a key issue restricting the safe, intelligent and efficient mining of mines. The changes in the mining roof overburden structure and the resulting redistribution of surrounding rock stress determine the stability of the tunnel. The stress environment of the surrounding rock of complex and difficult tunnels is complex, and they are in the comprehensive stress field of tunnel excavation and working face mining disturbance.

[0003] Most of the research on mining stress in the prior art focuses on the changes in the supporting stress formed in the front, rear and lateral directions during the mining of the working face, while the dynamic evolution law of the three-dimensional stress of the mining roadway surrounding rock in the complete process of excavation and mining is rarely involved. Due to the superimposed disturbance of multiple excavations and mining, the surrounding rock stress environment is complex. In addition, considering the safety factors and the feasibility of on-site monitoring at all stages, due to the constraints of factors such as safety management and power supply in the goaf area, it is generally difficult to obtain the surrounding rock stress behind the mining working face through on-site monitoring; in addition, the scientificity of the method of monitoring the surrounding rock stress by coal pillar stress gauges or hollow inclusion stress gauges is still controversial. In the past, few studies have obtained the dynamic evolution law of the three-dimensional stress of the surrounding rock in the whole cycle of the roadway service. The breaking and migration of the overburden during mining is the essential reason for the formation of mining stress. As the working face advances, the goaf continues to experience the process of collapse-filling-compacting, which has a great impact on the mining stress. However, it is difficult to accurately and directly realize the test of the three-dimensional mining stress of the surrounding rock of the coal mine roadway through the existing technical means. Summary of the invention

[0004] The invention provides a method and device for testing three-dimensional mining stress of surrounding rock of coal mine tunnel, which are used to solve the defect that it is difficult to accurately and directly test the three-dimensional mining stress of surrounding rock of coal mine tunnel in the prior art.

[0005] The present invention provides a method for testing three-dimensional mining stress of surrounding rock in a coal mine tunnel, comprising:

[0006] Based on multiple sets of model building parameters, a single unit uniaxial compression model is constructed with compressive stress-volume strain benchmark change information as the standard, wherein the compressive stress-volume strain benchmark change information is determined based on the compressive stress-volume strain benchmark curve of the rock mass in the goaf;

[0007] Based on the single unit uniaxial compression model and the three-dimensional information of the surrounding rock of the coal mine roadway, a rock mass constitutive model within the collapse zone is constructed to test the three-dimensional stress dynamic evolution information of the surrounding rock of the roadway according to the rock mass constitutive model within the collapse zone.

[0008] According to a method for testing three-dimensional mining stress of surrounding rock of a coal mine tunnel provided by the present invention, before constructing a single-unit uniaxial compression model based on multiple sets of model construction parameters and taking compressive stress-volume strain benchmark change information as a standard, the method further includes:

[0009] Conducting a uniaxial compression test on crushed gangue based on a rock mechanics servo testing machine, and dynamically acquiring test data during the test, wherein the test data includes at least one of compressive stress, axial strain, and radial strain;

[0010] Based on the test data, a compressive stress-volume strain benchmark curve of the rock mass in the goaf is obtained.

[0011] According to a method for testing three-dimensional mining stress of surrounding rock of a coal mine tunnel provided by the present invention, after obtaining a compressive stress-volume strain reference curve of rock mass in a goaf area, the method further comprises:

[0012] Based on the compressive stress-volume strain reference curve of the rock mass in the goaf, a plurality of linear segments are obtained, wherein the length of each linear segment is determined based on a preset strain interval;

[0013] Based on the relationship between the slope value of each linear segment, the elastic modulus and the Poisson's ratio, the bulk modulus and the shear modulus are determined to obtain compressive stress-volume strain reference change information according to the bulk modulus and the shear modulus.

[0014] According to a method for testing three-dimensional mining stress of surrounding rock of coal mine tunnels provided by the present invention, the model construction parameters include: strain interval, maximum strain value that the rock mass in the goaf can withstand, Poisson's ratio and at least one of the initial elastic modulus.

[0015] According to a method for testing three-dimensional mining stress of surrounding rock of coal mine tunnel provided by the present invention, a single-unit uniaxial compression model is constructed based on multiple sets of model construction parameters and with compressive stress-volume strain benchmark change information as a standard, including:

[0016] Establish a model and obtain multiple sets of model building parameters;

[0017] For any set of the model building parameters, based on the model building parameters, the upper end strain value and the lower end strain value of each linear segment in the model are obtained, and the upper end stress and the lower end stress of the segment are determined;

[0018] Determine a current strain value of the model based on the segment upper end stress and the segment lower end stress;

[0019] When the upper strain value of the segment is greater than the current strain value, the upper strain value of the current linear segment is used as the lower strain value of the next linear segment, and the upper strain value of the next linear segment is updated based on the initial lower strain value of the next linear segment and the strain interval;

[0020] All model building parameters are traversed until the current strain value of the model is close to the maximum strain value, and a single-unit uniaxial compression model is obtained.

[0021] The present invention also provides a testing device for three-dimensional mining stress of surrounding rock in coal mine tunnels, comprising:

[0022] A construction module is used to construct a single-unit uniaxial compression model based on multiple sets of model construction parameters and based on compressive stress-volume strain benchmark change information, wherein the compressive stress-volume strain benchmark change information is determined based on a compressive stress-volume strain benchmark curve of the rock mass in the goaf;

[0023] The test module is used to construct a rock mass constitutive model within the collapse zone based on the single unit uniaxial compression model and the three-dimensional information of the surrounding rock of the coal mine tunnel, so as to test the three-dimensional stress dynamic evolution information of the tunnel surrounding rock according to the rock mass constitutive model within the collapse zone.

[0024] According to a test device for three-dimensional mining stress of surrounding rock of a coal mine tunnel provided by the present invention, the device also includes:

[0025] An acquisition module, used for performing a uniaxial compression test of crushed gangue based on a rock mechanics servo testing machine, and dynamically acquiring test data during the test, wherein the test data includes at least one of compressive stress, axial strain and radial strain;

[0026] The experimental module is used to obtain a compressive stress-volume strain benchmark curve of the rock mass in the goaf based on the test data.

[0027] According to a test device for three-dimensional mining stress of surrounding rock of a coal mine tunnel provided by the present invention, the device further comprises:

[0028] An analysis module, used for obtaining a plurality of linear segments based on the compressive stress-volume strain reference curve of the rock mass in the goaf, wherein the length of each linear segment is determined based on a preset strain interval;

[0029] A determination module is used to determine the bulk modulus and shear modulus based on the relationship between the slope value of each linear segment, the elastic modulus and the Poisson's ratio, so as to obtain compressive stress-volume strain benchmark change information according to the bulk modulus and the shear modulus.

[0030] The present invention also provides a testing device for three-dimensional mining stress of surrounding rock in coal mine tunnels, wherein the model construction parameters include at least one of strain interval, maximum strain value that rockfall in goaf area can bear, Poisson's ratio and initial elastic modulus.

[0031] The present invention also provides a device for testing three-dimensional mining stress of surrounding rock in coal mine tunnels, wherein the building module is specifically used for:

[0032] Establish a model and obtain multiple sets of model building parameters;

[0033] For any set of the model building parameters, based on the model building parameters, the upper end strain value and the lower end strain value of each linear segment in the model are obtained, and the upper end stress and the lower end stress of the segment are determined;

[0034] Determine a current strain value of the model based on the segment upper end stress and the segment lower end stress;

[0035] When the upper strain value of the segment is greater than the current strain value, the upper strain value of the current linear segment is used as the lower strain value of the next linear segment, and the upper strain value of the next linear segment is updated based on the initial lower strain value of the next linear segment and the strain interval;

[0036] All model building parameters are traversed until the current strain value of the model is close to the maximum strain value, and a single-unit uniaxial compression model is obtained.

[0037] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the method for testing three-dimensional mining stress of surrounding rock of coal mine tunnels as described in any one of the above-mentioned methods are implemented.

[0038] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the above-described methods for testing three-dimensional mining stress of surrounding rock in coal mine tunnels.

[0039] The present invention also provides a computer program product, comprising a computer program, which, when executed by a processor, implements the steps of any of the above-mentioned methods for testing three-dimensional mining stress of surrounding rock in coal mine tunnels.

[0040] The present invention provides a testing method and device for three-dimensional mining stress of surrounding rock of coal mine tunnels. A single-unit uniaxial compression model is constructed based on the compressive stress-volume strain benchmark curve of the caving rock mass in the goaf area, and then a rock mass constitutive model within the collapse zone is constructed based on the three-dimensional information of the surrounding rock of the coal mine tunnels. The three-dimensional mining stress of the surrounding rock of the coal mine tunnels throughout the entire life cycle is effectively grasped, which has important theoretical guiding significance and engineering application value for analyzing the stability of the surrounding rock of complex and difficult tunnels, exploring control technology, and realizing safe, intelligent, and efficient mining in mines. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 A schematic diagram of a process flow of a method for testing three-dimensional mining stress of surrounding rock in a coal mine tunnel provided in an embodiment of the present application;

[0043] Figure 2 A schematic diagram of a uniaxial compression test of crushed gangue provided in an embodiment of the present application;

[0044] Figure 3 A schematic diagram of the compressive stress-volume strain curve of crushed gangue provided in an embodiment of the present application;

[0045] Figure 4 It is a schematic diagram of the typical stress-strain characteristics of the rock mass in the goaf described in the embodiments of the present application and its piecewise linear approximation principle;

[0046] Figure 5 It is an algorithm flow chart of the improved elastic strain hardening constitutive model described in the embodiments of the present application;

[0047] Figure 6 A schematic diagram of a test device for three-dimensional mining stress of surrounding rock in a coal mine tunnel provided in an embodiment of the present application;

[0048] Figure 7 An example physical structure diagram of an electronic device is provided. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] Figure 1 A schematic flow chart of a method for testing three-dimensional mining stress of surrounding rock in a coal mine tunnel provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, including:

[0051] Step 110, based on multiple sets of model building parameters, a single unit uniaxial compression model is constructed based on compressive stress-volume strain benchmark change information, wherein the compressive stress-volume strain benchmark change information is determined based on a compressive stress-volume strain benchmark curve of the rock mass falling out of the goaf;

[0052] Specifically, the multiple sets of construction parameters described in the embodiments of the present application are pre-set construction parameters for constructing a single unit uniaxial compression model, and each set of construction parameters may include a strain interval δ ε , the maximum strain that the rock mass in the goaf can withstand ε m , Poisson's ratio ν and initial elastic modulus E 0 .

[0053] The compressive stress-volume strain reference curve of the rock mass in the goaf described in the embodiment of the present application is a numerical relationship that can effectively reflect the change in the volume of broken gangue at the coal tunnel construction site as the compressive stress changes.

[0054] In an embodiment of the present application, a single-unit uniaxial compression model is constructed by using multiple sets of construction parameters, and then continuous attempts are made to simulate the respective compressive stress-volume strain curves, thereby obtaining a model of the compressive stress-volume strain curve that is closest to the compressive stress-volume strain reference curve, thereby finally completing the construction of the single-unit axial compression model.

[0055] Step 120, based on the single unit uniaxial compression model and the three-dimensional information of the surrounding rock of the coal mine tunnel, construct a rock mass constitutive model within the collapse zone to test the three-dimensional stress dynamic evolution information of the tunnel surrounding rock according to the rock mass constitutive model within the collapse zone.

[0056] Specifically, the three-dimensional information of the surrounding rock of the coal mine tunnel described in the embodiment of the present application can specifically describe the specific information of the surrounding rock structure of the currently operating coal mine tunnel, and can specifically construct a rock constitutive model within the collapse zone through multiple single-unit uniaxial compression models.

[0057] The rock mass constitutive model within the collapse zone described in the embodiments of the present application can well simulate the entire longwall working face mining process, monitor the distribution law of the supporting pressure of the mining working face and the dynamic evolution law of the three-dimensional stress of the tunnel surrounding rock.

[0058] In the embodiment of the present application, a single-unit uniaxial compression model is constructed based on the compressive stress-volume strain benchmark curve of the rock mass in the goaf, and then a constitutive model of the rock mass within the collapse zone is constructed based on the three-dimensional information of the surrounding rock of the coal mine tunnel. This effectively grasps the three-dimensional mining stress of the surrounding rock of the coal mine tunnel throughout its life cycle, which has important theoretical guiding significance and engineering application value for analyzing the stability of the surrounding rock of complex and difficult tunnels, exploring control technology, and realizing safe, intelligent, and efficient mining in mines.

[0059] Optionally, before constructing a single unit uniaxial compression model based on multiple sets of model construction parameters and taking compressive stress-volume strain benchmark change information as a standard, the method further includes:

[0060] Conducting a uniaxial compression test on crushed gangue based on a rock mechanics servo testing machine, and dynamically acquiring test data during the test, wherein the test data includes at least one of compressive stress, axial strain, and radial strain;

[0061] Based on the test data, a compressive stress-volume strain benchmark curve of the rock mass in the goaf is obtained.

[0062] Specifically, the rock mechanics servo testing machine described in the embodiments of the present application may specifically refer to an experimental device including a steel barrel and a compression piston.

[0063] In the embodiment of the present application, the coal seam roof rock mass samples within the height range of the goaf collapse zone are collected. Figure 2 A schematic diagram of a uniaxial compression test of crushed gangue provided in the embodiment of the present application is shown in FIG. Figure 2 As shown in the figure, a uniaxial compression test of crushed gangue was carried out using a rock mechanics servo testing machine according to the steps of gangue crushing-screening-loading into steel barrels-compression-cleaning-reloading-testing. During the test, the compressive stress, axial strain and radial strain data were dynamically monitored, and finally the compressive stress-volume strain curve of crushed gangue was drawn. Figure 3 Schematic diagram of the compressive stress-volume strain curve of crushed gangue provided in the embodiment of the present application.

[0064] In an embodiment of the present application, by conducting a uniaxial compression test on broken gangue samples of coal seam roof rock mass samples within the height range of the empty area collapse zone of the construction site under laboratory conditions, a broken gangue compressive stress-volume strain curve that can represent the rock mass characteristics of the construction site can be effectively obtained.

[0065] Optionally, after obtaining the compressive stress-volume strain reference curve of the rock mass in the goaf, the method further comprises:

[0066] Based on the compressive stress-volume strain reference curve of the rock mass in the goaf, a plurality of linear segments are obtained, wherein the length of each linear segment is determined based on a preset strain interval;

[0067] Based on the relationship between the slope value of each linear segment, the elastic modulus and the Poisson's ratio, the bulk modulus and the shear modulus are determined to obtain compressive stress-volume strain reference change information according to the bulk modulus and the shear modulus.

[0068] Specifically, in the embodiments of the present application, Figure 4 Schematic diagram of the typical stress-strain characteristics of the rock mass in the goaf described in the embodiments of the present application and its piecewise linear approximation principle, as shown in FIG. Figure 4 As shown in the figure, during the gradual compaction of the rock mass in the goaf, its elastic stiffness increases with the increase of volume strain. By taking the method of updating its modulus within a certain value of strain interval, the stress-strain characteristics of the hardening of the rock mass in the goaf can be simulated by an improved elastic model, and the hyperbolic stress-strain curve can be approximated as a set of linear segments. The size of each segment is determined by a predefined strain interval δε, and the slope of the segment is calculated based on the stress and strain values ​​at both ends of the segment. Then, the relationship between the slope value Ec and the elastic modulus and Poisson's ratio is used to determine the bulk modulus Kc and the shear modulus Gc. These modulus values ​​are updated within a certain strain interval δε according to the current strain value εc in the model, and finally the compressive stress-volume strain benchmark change information is obtained according to the bulk modulus and shear modulus.

[0069] In the embodiment of the present application, since the compressive stress-volumetric strain baseline curve of the rock mass in the goaf cannot be directly analyzed and processed by a computer program, and since each segment of the interval can be approximated as a line segment after multiple segmentation, it can be easily processed by a computer program and the curve can be effectively applied to modeling.

[0070] Optionally, the method of constructing a single unit uniaxial compression model based on multiple sets of model construction parameters and taking compressive stress-volume strain benchmark change information as a standard includes:

[0071] Establish a model and obtain multiple sets of model building parameters;

[0072] For any set of the model building parameters, based on the model building parameters, the upper end strain value and the lower end strain value of each linear segment in the model are obtained, and the upper end stress and the lower end stress of the segment are determined;

[0073] Determine a current strain value of the model based on the segment upper end stress and the segment lower end stress;

[0074] When the upper strain value of the segment is greater than the current strain value, the upper strain value of the current linear segment is used as the lower strain value of the next linear segment, and the upper strain value of the next linear segment is updated based on the initial lower strain value of the next linear segment and the strain interval;

[0075] All model building parameters are traversed until the current strain value of the model is close to the maximum strain value, and a single-unit uniaxial compression model is obtained.

[0076] Specifically, Figure 5 This is an algorithm flow chart of the improved elastic strain hardening constitutive model described in the embodiments of this application, such as Figure 5 As shown in the figure, firstly, the model is established and the elastic constitutive model and parameters are assigned, and the boundary and initial conditions are imposed. Four input parameters are required: strain interval δε, the maximum strain εm that the rock mass in the goaf can withstand, Poisson's ratio ν, and the initial elastic modulus E0. The size of the segment is determined by the input strain interval δε, and the strain εu corresponding to the upper end of the segment is obtained by adding the strain εl at the lower end to the strain interval δε, and the initial strain εl at the lower end is zero. The stress σu corresponding to the upper end of the segment and the stress σl corresponding to the lower end of the segment are calculated by replacing their respective strain values ​​in the Salamon model formula.

[0077] The elastic stiffness Ec of the current segment is calculated using the previously calculated stress and strain values ​​and updated in the numerical model by converting to bulk and shear moduli. Then, the model is run for a finite time step and a check is made to see if the current strain value εc is less than εu. When εc in the model exceeds εu of the current segment, εu of the current segment becomes εl of the next segment, which is obtained by adding δε to εl of the segment. The same process is repeated to calculate and update the modulus values ​​in the model until εc approaches the maximum strain value εm, thus ensuring that εu of the last segment does not exceed εm.

[0078] An initial single-unit numerical model was established in FLAC3D software, and the improved elastic strain hardening constitutive model algorithm was used as its constitutive model. Uniaxial compression numerical simulation research was carried out to obtain the compressive stress-volume strain curve. The model was verified by analyzing and comparing the compressive stress-volume strain curves obtained from the crushed gangue compression test and the single-unit uniaxial compression numerical simulation, and finally a single-unit uniaxial compression model was established.

[0079] In the embodiments of the present application, by constructing a single-unit uniaxial compression model, the three-dimensional mining stress of the surrounding rock of the coal mine tunnel throughout its life cycle is mastered, which has important theoretical guiding significance and engineering application value for analyzing the stability of the surrounding rock of complex and difficult tunnels, exploring control technology, and realizing safe, intelligent, and efficient mining in mines.

[0080] The testing device for three-dimensional mining stress of surrounding rock of coal mine tunnel provided by the present invention is described below. The testing device for three-dimensional mining stress of surrounding rock of coal mine tunnel described below and the testing method for three-dimensional mining stress of surrounding rock of coal mine tunnel described above can be referenced to each other.

[0081] Figure 6 A schematic diagram of a testing device for three-dimensional mining stress of surrounding rock in a coal mine tunnel provided in an embodiment of the present application is shown in FIG. Figure 6 As shown, including:

[0082] The construction module 610 is used to construct a single unit uniaxial compression model based on multiple sets of model construction parameters and based on compressive stress-volume strain benchmark change information, wherein the compressive stress-volume strain benchmark change information is determined based on the compressive stress-volume strain benchmark curve of the rock mass in the goaf;

[0083] The test module 620 is used to construct a rock mass constitutive model within the collapse zone based on the single unit uniaxial compression model and the three-dimensional information of the surrounding rock of the coal mine tunnel, so as to test the three-dimensional stress dynamic evolution information of the tunnel surrounding rock according to the rock mass constitutive model within the collapse zone.

[0084] According to a test device for three-dimensional mining stress of surrounding rock of a coal mine tunnel provided by the present invention, the device also includes:

[0085] An acquisition module, used for performing a uniaxial compression test of crushed gangue based on a rock mechanics servo testing machine, and dynamically acquiring test data during the test, wherein the test data includes at least one of compressive stress, axial strain and radial strain;

[0086] The experimental module is used to obtain a compressive stress-volume strain benchmark curve of the rock mass in the goaf based on the test data.

[0087] According to a test device for three-dimensional mining stress of surrounding rock of a coal mine tunnel provided by the present invention, the device further comprises:

[0088] An analysis module, used for obtaining a plurality of linear segments based on the compressive stress-volume strain reference curve of the rock mass in the goaf, wherein the length of each linear segment is determined based on a preset strain interval;

[0089] A determination module is used to determine the bulk modulus and shear modulus based on the relationship between the slope value of each linear segment, the elastic modulus and the Poisson's ratio, so as to obtain compressive stress-volume strain benchmark change information according to the bulk modulus and the shear modulus.

[0090] The present invention also provides a testing device for three-dimensional mining stress of surrounding rock in coal mine tunnels, wherein the model construction parameters include at least one of strain interval, maximum strain value that rockfall in goaf area can bear, Poisson's ratio and initial elastic modulus.

[0091] The present invention also provides a device for testing three-dimensional mining stress of surrounding rock in coal mine tunnels, wherein the building module is specifically used for:

[0092] Establish a model and obtain multiple sets of model building parameters;

[0093] For any set of the model building parameters, based on the model building parameters, the upper end strain value and the lower end strain value of each linear segment in the model are obtained, and the upper end stress and the lower end stress of the segment are determined;

[0094] Determine a current strain value of the model based on the segment upper end stress and the segment lower end stress;

[0095] When the upper strain value of the segment is greater than the current strain value, the upper strain value of the current linear segment is used as the lower strain value of the next linear segment, and the upper strain value of the next linear segment is updated based on the initial lower strain value of the next linear segment and the strain interval;

[0096] All model building parameters are traversed until the current strain value of the model is close to the maximum strain value, and a single-unit uniaxial compression model is obtained.

[0097] The present invention provides a testing device for the three-dimensional mining stress of coal mine tunnel surrounding rock. By taking the compressive stress-volume strain benchmark curve of the rock mass in the goaf as a benchmark, a single-unit uniaxial compression model is constructed, and then a rock mass constitutive model within the collapse zone is constructed based on the three-dimensional information of the coal mine tunnel surrounding rock. This effectively grasps the three-dimensional mining stress of the coal mine tunnel surrounding rock throughout its life cycle, and has important theoretical guiding significance and engineering application value for analyzing the stability of complex and difficult tunnel surrounding rock, exploring control technology, and realizing safe, intelligent, and efficient mining in mines.

[0098] Figure 7 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 7As shown, the electronic device may include: a processor 710, a communication interface 720, a memory 730 and a communication bus 740, wherein the processor 710, the communication interface 720 and the memory 730 communicate with each other through the communication bus 740. The processor 710 may call the logic instructions in the memory 730 to execute a method for testing three-dimensional mining stress of surrounding rock of a coal mine tunnel, the method comprising: based on multiple sets of model construction parameters, taking the compressive stress-volume strain benchmark change information as a standard, constructing a single unit uniaxial compression model, wherein the compressive stress-volume strain benchmark change information is determined based on the compressive stress-volume strain benchmark curve of the rock mass in the goaf; based on the single unit uniaxial compression model and the three-dimensional information of the surrounding rock of the coal mine tunnel, constructing a rock mass constitutive model within the collapse zone, so as to test the dynamic evolution information of the three-dimensional stress of the surrounding rock of the tunnel according to the rock mass constitutive model within the collapse zone.

[0099] In addition, the logic instructions in the above-mentioned memory 730 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0100] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the testing method of the three-dimensional mining stress of the surrounding rock of the coal mine tunnel provided by the above-mentioned methods. The method includes: based on multiple sets of model construction parameters, a single-unit uniaxial compression model is constructed with the compressive stress-volume strain benchmark change information as the standard, wherein the compressive stress-volume strain benchmark change information is determined based on the compressive stress-volume strain benchmark curve of the rock mass in the goaf; based on the single-unit uniaxial compression model and the three-dimensional information of the surrounding rock of the coal mine tunnel, a constitutive model of the rock mass within the collapse zone is constructed to test the three-dimensional stress dynamic evolution information of the tunnel surrounding rock according to the rock mass constitutive model within the collapse zone.

[0101] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a method for testing the three-dimensional mining stress of coal mine tunnel surrounding rock provided by the above-mentioned methods, the method comprising: based on multiple sets of model construction parameters, a single-unit uniaxial compression model is constructed with compressive stress-volume strain benchmark change information as a standard, wherein the compressive stress-volume strain benchmark change information is determined based on the compressive stress-volume strain benchmark curve of the rock mass in the goaf; based on the single-unit uniaxial compression model and the three-dimensional information of the surrounding rock of the coal mine tunnel, a constitutive model of the rock mass within the collapse zone is constructed, so as to test the three-dimensional stress dynamic evolution information of the tunnel surrounding rock according to the rock mass constitutive model within the collapse zone.

[0102] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0103] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for testing three-dimensional mining stress of surrounding rock in coal mine tunnels, characterized in that: include: Based on multiple sets of model building parameters, a single unit uniaxial compression model is constructed with compressive stress-volume strain benchmark change information as the standard, wherein the compressive stress-volume strain benchmark change information is determined based on the compressive stress-volume strain benchmark curve of the rock mass in the goaf; Based on the single unit uniaxial compression model and the three-dimensional information of the surrounding rock of the coal mine roadway, a rock mass constitutive model within the collapse zone is constructed to test the three-dimensional stress dynamic evolution information of the surrounding rock of the roadway according to the rock mass constitutive model within the collapse zone; The model building parameters include: at least one of the strain interval, the maximum strain value that the rock mass in the goaf can withstand, the Poisson's ratio and the initial elastic modulus; The method of constructing a single unit uniaxial compression model based on multiple sets of model construction parameters and taking compressive stress-volume strain benchmark change information as a standard includes: Establish a model and obtain multiple sets of model building parameters; For any set of the model building parameters, based on the model building parameters, the upper end strain value and the lower end strain value of each linear segment in the model are obtained, and the upper end stress and the lower end stress of the segment are determined; Determining a current strain value of the model based on the segment upper end stress and the segment lower end stress; When the upper strain value of the segment is greater than the current strain value, the upper strain value of the current linear segment is used as the lower strain value of the next linear segment, and the upper strain value of the next linear segment is updated based on the initial lower strain value of the next linear segment and the strain interval; All model building parameters are traversed until the current strain value of the model is close to the maximum strain value, and a single-unit uniaxial compression model is obtained.

2. The method for testing three-dimensional mining stress of surrounding rock of coal mine tunnel according to claim 1, characterized in that: Before constructing a single unit uniaxial compression model based on multiple sets of model construction parameters and taking compressive stress-volume strain benchmark change information as a standard, the method further includes: Conducting a uniaxial compression test on crushed gangue based on a rock mechanics servo testing machine, and dynamically acquiring test data during the test, wherein the test data includes at least one of compressive stress, axial strain, and radial strain; Based on the test data, a compressive stress-volume strain benchmark curve of the rock mass in the goaf is obtained.

3. The method for testing three-dimensional mining stress of surrounding rock of coal mine tunnel according to claim 2, characterized in that: After obtaining the compressive stress-volume strain reference curve of the rock mass in the goaf, the method further comprises: Based on the compressive stress-volume strain reference curve of the rock mass in the goaf, a plurality of linear segments are obtained, wherein the length of each linear segment is determined based on a preset strain interval; Based on the relationship between the slope value of each linear segment, the elastic modulus and the Poisson's ratio, the bulk modulus and the shear modulus are determined to obtain compressive stress-volume strain reference change information according to the bulk modulus and the shear modulus.

4. A test device for three-dimensional mining stress of surrounding rock in coal mine tunnels, characterized in that: include: A construction module is used to construct a single-unit uniaxial compression model based on multiple sets of model construction parameters and based on compressive stress-volume strain benchmark change information, wherein the compressive stress-volume strain benchmark change information is determined based on a compressive stress-volume strain benchmark curve of the rock mass in the goaf; A testing module is used to construct a rock mass constitutive model within the collapse zone based on the single unit uniaxial compression model and the three-dimensional information of the surrounding rock of the coal mine roadway, so as to test the three-dimensional stress dynamic evolution information of the surrounding rock of the roadway according to the rock mass constitutive model within the collapse zone; The model building parameters include: at least one of the strain interval, the maximum strain value that the rock mass in the goaf can withstand, the Poisson's ratio and the initial elastic modulus; The method of constructing a single unit uniaxial compression model based on multiple sets of model construction parameters and taking compressive stress-volume strain benchmark change information as a standard includes: Establish a model and obtain multiple sets of model building parameters; For any set of the model building parameters, based on the model building parameters, the upper end strain value and the lower end strain value of each linear segment in the model are obtained, and the upper end stress and the lower end stress of the segment are determined; Determining a current strain value of the model based on the segment upper end stress and the segment lower end stress; When the upper strain value of the segment is greater than the current strain value, the upper strain value of the current linear segment is used as the lower strain value of the next linear segment, and the upper strain value of the next linear segment is updated based on the initial lower strain value of the next linear segment and the strain interval; All model building parameters are traversed until the current strain value of the model is close to the maximum strain value, and a single-unit uniaxial compression model is obtained.

5. The device for testing three-dimensional mining stress of surrounding rock in coal mine tunnels according to claim 4, characterized in that: The device also includes: An acquisition module, used for performing a uniaxial compression test of crushed gangue based on a rock mechanics servo testing machine, and dynamically acquiring test data during the test, wherein the test data includes at least one of compressive stress, axial strain and radial strain; The experimental module is used to obtain a compressive stress-volume strain benchmark curve of the rock mass in the goaf based on the test data.

6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the method for testing three-dimensional mining stress of surrounding rock in coal mine tunnels as described in any one of claims 1 to 3 are implemented.

7. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for testing three-dimensional mining stress of surrounding rock of a coal mine tunnel as claimed in any one of claims 1 to 3 are implemented.

8. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method for testing three-dimensional mining stress of surrounding rock of a coal mine tunnel as claimed in any one of claims 1 to 3 are implemented.

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