Method and device for determining pressure relief strategy of coal rock mass and storage medium

Abstract

The invention discloses a method and a device for determining a pressure relief strategy of a coal rock mass, and a storage medium. The method comprises the steps that basic data of a coal-rock mass are obtained, and the basic data are used for simulating physical and mechanical parameters and / or boundary conditions of the coal-rock mass; based on the basic data, simulating the coal rock mass to obtain a simulation result; determining an initial pressure relief strategy of the coal rock mass based on the simulation result; pressure relief is conducted on the coal rock mass according to the initial pressure relief strategy, actual stability information and actual energy accumulation information of the coal rock mass in the pressure relief process are obtained, the actual stability information is used for indicating the stress distribution condition of the coal rock mass in the pressure relief process, and the actual energy accumulation information is used for indicating the stress distribution condition of the coal rock mass in the pressure relief process; the actual energy accumulation information is used for indicating the strain energy accumulation degree in the coal and rock mass in the pressure relief process; and adjusting the initial pressure relief strategy based on the actual stability information and the actual energy accumulation information to obtain a target pressure relief strategy. The technical problem that the stress concentration degree of the coal rock mass cannot be reduced is solved.

Description

Technical Field

[0001] The present invention relates to the field of coal mine safety technology, and in particular to a method, a device, and a storage medium for determining a pressure relief strategy for a coal rock mass. Background Art

[0002] At present, in the field of coal mining, especially when facing steeply inclined and thick coal seams or complex geological conditions, dynamic disasters such as rock burst and rock burst are important threats to mine safety. These dynamic disasters are often caused by stress concentration and energy accumulation in coal and rock masses, posing a serious threat to the life safety of miners and mine facilities. Therefore, how to effectively relieve pressure to reduce the stress concentration of coal and rock masses has become an urgent problem to be solved in mining.

[0003] In the relevant technology, the traditional pressure relief methods mainly include blasting pressure relief, water injection pressure relief, drilling pressure relief, etc. Among them, although blasting pressure relief can quickly reduce the stress of coal rock mass in a short time, it has disadvantages such as large vibration and great impact on the surrounding environment; water injection pressure relief injects water or other fluids into the coal rock mass to produce cracks and gaps in the coal rock mass, reducing its strength and stress concentration, but the effect and range of water injection are affected by the permeability of the coal rock mass; drilling pressure relief opens a borehole inside the coal rock mass to create a stress release space inside the coal rock mass and reduce the stress concentration, but the size and position of the borehole have a great influence on the pressure relief effect, and it is necessary to optimize the position parameters through numerical simulation methods. Therefore, there is a technical problem that the stress concentration of the coal rock mass cannot be reduced.

[0004] With respect to the above-mentioned technical problem of being unable to reduce the stress concentration of coal rock masses, no effective solution has been proposed so far. Summary of the invention

[0005] The embodiments of the present invention provide a method, device, and storage medium for determining a pressure relief strategy for a coal-rock mass, so as to at least solve the technical problem that the stress concentration degree of the coal-rock mass cannot be reduced.

[0006] According to one aspect of an embodiment of the present invention, a method for determining a decompression strategy for a coal rock mass is provided. The method may include: obtaining basic data of the coal rock mass, wherein the basic data is used to simulate the physical and mechanical parameters and / or boundary conditions of the coal rock mass; simulating the coal rock mass based on the basic data to obtain simulation results, wherein the simulation results at least include predicted stability information and predicted energy accumulation information, wherein the predicted stability information is used to indicate the predicted stress distribution of the coal rock mass, and the predicted energy accumulation information is used to indicate the predicted strain energy accumulation degree inside the coal rock mass; determining an initial decompression strategy for the coal rock mass based on the simulation results, wherein the initial decompression strategy is used to indicate the rules for decompressing the coal rock mass; decompressing the coal rock mass according to the initial decompression strategy, and obtaining actual stability information and actual energy accumulation information of the coal rock mass during the decompression process, wherein the actual stability information is used to indicate the stress distribution of the coal rock mass during the decompression process, and the actual energy accumulation information is used to indicate the strain energy accumulation degree inside the coal rock mass during the decompression process; adjusting the initial decompression strategy based on the actual stability information and the actual energy accumulation information to obtain a target decompression strategy.

[0007] Optionally, based on the basic data, the coal rock mass is simulated to obtain simulation results, including: predicting a target area of ​​the coal rock mass based on the basic data, wherein the target area is used to indicate potential rock burst and rock burst hazard areas; based on the target area and the basic data, the coal rock mass is simulated to obtain simulation results.

[0008] Optionally, the coal rock mass is depressurized according to the initial depressurization strategy, and actual stability information and actual energy accumulation information of the coal rock mass during the depressurization process are obtained, including: depressurizing the coal rock mass according to the initial depressurization strategy, and determining water injection information during the depressurization process, wherein the water injection information may at least include: the wetting radius of the coal rock mass under water injection, the distance between the borehole and the side of the tunnel and / or the depth between the borehole and the bottom plate; based on the water injection information, the actual stability information and actual energy accumulation information of the coal rock mass during the depressurization process are obtained.

[0009] Optionally, based on the actual stability information and the actual energy accumulation information, the initial pressure relief strategy is adjusted to obtain a target pressure relief strategy, including: based on the actual stability information and the actual energy accumulation information, determining the execution result of the coal rock mass under the initial pressure relief strategy, wherein the execution result includes at least the execution effect and the safety level; based on the execution result, adjusting the initial pressure relief strategy to obtain the target pressure relief strategy.

[0010] Optionally, based on the actual stability information and the actual energy accumulation information, the execution result of the coal rock mass under the initial pressure relief strategy is determined, including: based on the actual stability information and the actual energy accumulation information, determining the pressure relief information of the coal rock mass, wherein the pressure relief information includes at least: on-site microseismic information, geosound information, electromagnetic radiation information, and stress monitoring information; integrating the pressure relief information to determine the execution result.

[0011] Optionally, the method for determining a pressure relief strategy for a coal rock mass further includes: storing a target pressure relief strategy.

[0012] According to another aspect of an embodiment of the present invention, a device for determining a pressure relief strategy for a coal rock mass is also provided. The device may include: a first acquisition unit, used to acquire basic data of the coal rock mass, wherein the basic data is used to simulate the physical and mechanical parameters and / or boundary conditions of the coal rock mass; a simulation unit, used to simulate the coal rock mass based on the basic data to obtain a simulation result, wherein the simulation result at least includes predicted stability information and predicted energy accumulation information, the predicted stability information is used to indicate the predicted stress distribution of the coal rock mass, and the predicted energy accumulation information is used to indicate the predicted strain energy accumulation degree inside the coal rock mass; a first determination unit, used to determine an initial pressure relief strategy for the coal rock mass based on the simulation result, wherein the initial pressure relief strategy is used to indicate the rules for unloading the coal rock mass; a second acquisition unit, used to unload the coal rock mass according to the initial pressure relief strategy, and obtain actual stability information and actual energy accumulation information of the coal rock mass during the pressure relief process, wherein the actual stability information is used to indicate the stress distribution of the coal rock mass during the pressure relief process, and the actual energy accumulation information is used to indicate the strain energy accumulation degree inside the coal rock mass during the pressure relief process; an adjustment unit, used to adjust the initial pressure relief strategy based on the actual stability information and the actual energy accumulation information to obtain a target pressure relief strategy.

[0013] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored program, wherein when the program is executed by a processor, the device where the storage medium is located is controlled to execute the method for determining the coal rock mass pressure relief strategy in an embodiment of the present invention.

[0014] According to another aspect of an embodiment of the present invention, a processor is provided, which is used to run a program, wherein when the program is run, the method for determining a pressure relief strategy for a coal rock mass in an embodiment of the present invention is executed.

[0015] According to another aspect of the embodiment of the present invention, a computer program product is provided, which includes computer instructions, and when the computer instructions are executed by a processor, the method for determining the pressure relief strategy of the coal-rock mass in the embodiment of the present invention is implemented.

[0016] In an embodiment of the present invention, basic data of a coal rock mass is obtained, wherein the basic data is used to simulate the physical and mechanical parameters and / or boundary conditions of the coal rock mass; based on the basic data, the coal rock mass is simulated to obtain a simulation result, wherein the simulation result at least includes predicted stability information and predicted energy accumulation information; based on the simulation result, an initial pressure relief strategy for the coal rock mass is determined; the coal rock mass is pressure relief according to the initial pressure relief strategy, and actual stability information and actual energy accumulation information of the coal rock mass during the pressure relief process are obtained, wherein the actual stability information is used to indicate the stress distribution of the coal rock mass during the pressure relief process, and the actual energy accumulation information is used to indicate the degree of strain energy accumulation inside the coal rock mass during the pressure relief process; based on the actual stability information and the actual energy accumulation information, the initial pressure relief strategy is adjusted to obtain a target pressure relief strategy. That is to say, the present invention simulates the coal rock mass through the basic data of the coal rock mass to obtain the simulation results, and then adjusts the initial pressure relief strategy according to the simulation results and the actual stability information and actual energy accumulation information of the coal rock mass during the pressure relief process to obtain the target pressure relief strategy, thereby solving the technical problem of being unable to reduce the stress concentration degree of the coal rock mass and achieving the technical effect of reducing the stress concentration degree of the coal rock mass. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 is a flow chart of a method for determining a pressure relief strategy for a coal rock mass according to an embodiment of the present invention;

[0019] Figure 2 It is a schematic diagram of a pressure relief and anti-bumping mode of an advanced high-pressure water injection area of ​​a tunneling working face according to an embodiment of the present invention;

[0020] Figure 3 is a schematic diagram of a plane radial seepage according to an embodiment of the present invention;

[0021] Figure 4 It is a flow chart of a method for joint pressure relief and anti-bumping based on numerical simulation of steeply inclined and extremely thick coal seam roadway area and local area according to an embodiment of the present invention;

[0022] Figure 5 is a schematic diagram of determining a tunnel side pressure relief parameter according to an embodiment of the present invention;

[0023] Figure 6 is a schematic diagram of determining a tunnel floor pressure relief parameter according to an embodiment of the present invention;

[0024] Figure 7is a schematic diagram of a pressure relief scheme for the area around the tunnel before ultra-high pressure water injection according to an embodiment of the present invention;

[0025] Figure 8 is a schematic diagram of a large-diameter drilling pressure relief principle according to an embodiment of the present invention;

[0026] FIG9( a ) is a schematic diagram of pressure relief for a laneway side and a large-diameter borehole at the head according to an embodiment of the present invention;

[0027] FIG9( b ) is a schematic diagram of another method of decompressing a laneway wall and a large-diameter borehole in accordance with an embodiment of the present invention;

[0028] Fig.10 It is a schematic diagram of a device for determining a pressure relief strategy for a coal rock mass according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only 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 should fall within the scope of protection of the present invention.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, functional component or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, functional components or devices.

[0031] According to an embodiment of the present invention, an embodiment of a method for determining a pressure relief strategy for a coal rock mass is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0032] Figure 1 is a flow chart of a method for determining a pressure relief strategy for a coal rock mass according to an embodiment of the present invention. Figure 1 As shown, the method may include the following steps:

[0033] Step S101, obtaining basic data of coal rock mass.

[0034] In the technical solution provided in the above step S101 of the present invention, the basic data is used to simulate the physical and mechanical parameters and / or boundary conditions of the coal rock mass.

[0035] In this embodiment, basic data of the coal and rock mass are obtained. For example, a three-dimensional geological model of the coal and rock mass is established using FLAC3D software, and the physical and mechanical parameters and boundary conditions of the model are obtained. This is only an illustrative example and does not limit the specific method of obtaining basic data of the coal and rock mass.

[0036] Step S102: simulate the coal rock mass based on the basic data to obtain simulation results.

[0037] In the technical solution provided in the above step S102 of the present invention, the simulation results at least include predicted stability information and predicted energy accumulation information, the predicted stability information is used to indicate the predicted stress distribution of the coal rock mass, and the predicted energy accumulation information is used to indicate the predicted degree of strain energy accumulation inside the coal rock mass.

[0038] In this embodiment, after the basic data of the coal-rock mass is acquired in step S101, the coal-rock mass is simulated according to the basic data to obtain a simulation result. For example, the coal-rock mass is simulated by FLAC3D software to obtain a simulation result, which is only an illustrative example and does not limit the specific method of simulating the coal-rock mass.

[0039] For example, according to the specific geological conditions of steeply inclined coal seams and basic data, a pressure relief method combining long-distance directional drilling + high-pressure water injection and large-diameter drilling is set up for simulation to determine the simulation results.

[0040] Optionally, the regional water injection and local large-diameter drilling pressure relief technology simulated by FLAC3D software can accurately relieve pressure according to the stress distribution and coal body characteristics in different areas, effectively reducing the probability of rock burst.

[0041] Step S103, determining the initial pressure relief strategy for the coal rock mass based on the simulation results.

[0042] In the technical solution provided in the above step S103 of the present invention, the initial pressure relief strategy is used to indicate the rules for pressure relief of the coal rock mass. The initial pressure relief strategy can also be called a pressure relief scheme.

[0043] In this embodiment, after the simulation results are determined in step S102, the initial pressure relief strategy for the coal and rock mass is determined according to the simulation results. For example, the optimal pressure relief scheme, that is, the initial pressure relief strategy, is selected by comparing the simulation results of the schemes.

[0044] Optionally, the initial pressure relief strategy may at least include: long-distance directional drilling and high-pressure water injection, large-diameter drilling and other pressure relief schemes, and determine the location, diameter, length and other parameters of the drilling.

[0045] Step S104, decompressing the coal-rock mass according to the initial decompression strategy, and obtaining actual stability information and actual energy accumulation information of the coal-rock mass during the decompression process.

[0046] In the technical solution provided in the above step S104 of the present invention, the actual stability information is used to indicate the stress distribution of the coal rock mass during the pressure relief process, and the actual energy accumulation information is used to indicate the degree of strain energy accumulation inside the coal rock mass during the pressure relief process.

[0047] In this embodiment, after the initial pressure relief strategy of the coal-rock mass is determined in step S103, the coal-rock mass is relieved according to the initial pressure relief strategy, and the actual stability information and actual energy accumulation information of the coal-rock mass during the pressure relief process are obtained. The actual stability information may also be referred to as actual stress change, and the actual energy accumulation information may also be referred to as energy condition.

[0048] For example, by implementing the initial pressure relief plan, through engineering techniques such as directional drilling, high-pressure water injection, and large-diameter drilling, the stress changes and energy conditions of the coal rock mass are monitored in real time during the pressure relief process.

[0049] Step S105, based on the actual stability information and the actual energy accumulation information, the initial pressure relief strategy is adjusted to obtain a target pressure relief strategy.

[0050] In the technical solution provided in the above step S105 of the present invention, the initial pressure relief strategy is optimized according to the actual stability information and the actual energy accumulation information to obtain the target pressure relief strategy.

[0051] In this embodiment, after the actual stability information and the actual energy accumulation information are acquired in step S104, the actual stability information and the actual energy accumulation information of the initial pressure relief strategy are evaluated using the evaluation data, the initial pressure relief strategy is optimized, and the target pressure relief strategy is obtained.

[0052] For example, transient electromagnetic detection and borehole surveillance are used in combination with on-site microseismic and geoacoustic data to evaluate the decompression effect, and the effect of regional and local combined decompression is evaluated, so as to optimize and adjust the plan in a timely manner.

[0053] It should be noted that the above embodiment can be implemented by a coal crushing and feeding control system.

[0054] In the above steps S101 to S105 of the present invention, basic data of the coal rock mass is obtained, wherein the basic data is used to simulate the physical and mechanical parameters and / or boundary conditions of the coal rock mass; based on the basic data, the coal rock mass is simulated to obtain simulation results, wherein the simulation results at least include predicted stability information and predicted energy accumulation information; based on the simulation results, an initial pressure relief strategy for the coal rock mass is determined; the coal rock mass is pressure relieved according to the initial pressure relief strategy, and actual stability information and actual energy accumulation information of the coal rock mass during the pressure relief process are obtained, wherein the actual stability information is used to indicate the stress distribution of the coal rock mass during the pressure relief process, and the actual energy accumulation information is used to indicate the degree of strain energy accumulation inside the coal rock mass during the pressure relief process; based on the actual stability information and the actual energy accumulation information, the initial pressure relief strategy is adjusted to obtain a target pressure relief strategy. That is to say, the present invention simulates the coal rock mass through the basic data of the coal rock mass to obtain the simulation results, and then adjusts the initial pressure relief strategy according to the simulation results and the actual stability information and actual energy accumulation information of the coal rock mass during the pressure relief process to obtain the target pressure relief strategy, thereby solving the technical problem of being unable to reduce the stress concentration degree of the coal rock mass and achieving the technical effect of reducing the stress concentration degree of the coal rock mass.

[0055] The above method of this embodiment is further introduced below.

[0056] As an optional implementation method, the coal rock mass is simulated based on basic data to obtain simulation results, including: predicting a target area of ​​the coal rock mass based on the basic data, wherein the target area is used to indicate potential rock burst and rock burst hazard areas; and simulating the coal rock mass based on the target area and the basic data to obtain simulation results.

[0057] In this embodiment, the target area of ​​the coal and rock mass is predicted based on the basic data. For example, through numerical simulation analysis, the stress distribution and energy accumulation of the coal and rock mass are predicted to determine the potential rock burst and rock burst danger areas.

[0058] Optionally, the coal rock mass is simulated according to the target area and basic data to obtain simulation results, that is, the three-dimensional geological model of the coal rock mass established by FLAC3D software is used to simulate the target area to obtain simulation results.

[0059] As an optional implementation method, the coal rock mass is depressurized according to the initial depressurization strategy, and the actual stability information and actual energy accumulation information of the coal rock mass during the depressurization process are obtained, including: depressurizing the coal rock mass according to the initial depressurization strategy, and determining the water injection information during the depressurization process, wherein the water injection information may at least include: the wetting radius of the coal rock mass under water injection, the distance between the borehole and the side of the tunnel and / or the depth between the borehole and the bottom plate; based on the water injection information, the actual stability information and actual energy accumulation information of the coal rock mass during the depressurization process are obtained.

[0060] In this embodiment, the coal rock mass is depressurized according to the initial depressurization strategy, and water injection information during the depressurization process is determined. For example, water injection depressurization is performed on both sides and the bottom plate of the tunnel ahead of the tunneling head.

[0061] For example, water injection is implemented on both sides and the bottom plate of the tunnel ahead of the tunneling head to relieve pressure. This technical solution arranges a drilling site behind the tunneling head, constructs long-distance directional drilling holes on both sides and the top and bottom plates along the direction of the tunneling working face, and then water injection is carried out after the drilling construction is completed, thus achieving double pressure relief by drilling + high-pressure water injection. Figure 2 Schematic diagram of a pressure relief and anti-bumping mode of an advanced high-pressure water injection area of ​​a tunneling working face according to an embodiment of the present invention, such as Figure 2 As shown in the figure, a pressure relief protection circle is created in a certain range around the tunnel to ensure that the tunnel is always excavated in the pressure relief area, ensuring the safety of tunnel excavation and subsequent operations. The quality of the pressure relief weakening effect of the tunnel surrounding rock mainly depends on the wet radius of the coal body under water injection and the depth of the drill hole from the tunnel wall and floor. Figure 3 is a schematic diagram of a plane radial seepage according to an embodiment of the present invention, such as Figure 3 As shown in the figure, coal seam water injection is the study of the movement of water in complex porous media. This porous medium refers to a porous medium that contains a large number of pores of various shapes, sizes, and connected or disconnected. Since the water injection borehole is very small compared to the wetting radius, drilling water injection in coal seams can be simplified to plane radial seepage. Then Darcy's law can be expressed using the following formula (1):

[0062]

[0063] Integrating the above formula (1) yields the following formula (2):

[0064]

[0065] Where v is the seepage velocity, cm / s; O is the injection flow rate, cm 3 / s; k is the permeability of the coal seam, D; μ is the fluid viscosity, cp; h is the borehole length, m; S is the cross-sectional area, m 2 ; r is the outer boundary radius, m; r w is the inner boundary radius, m; pr is the pressure at a distance r from the borehole, Pa; p w is the internal boundary pressure, Pa. The average velocity of seepage can be expressed using the following formula (3):

[0066]

[0067] At this time, the seepage area can be expressed using the following formula (4):

[0068] S=2πrh (4)

[0069] In actual work, in order to reduce the impact of coal seam water injection on production, the coal seam water injection time t is relatively fixed, so the wetting range per unit time is It can be expressed using the following formula (5).

[0070]

[0071] Among them, get r w 、p w The specific values ​​of , k, and μ are used to set the water injection time, thereby calculating the coal body wetting range R.

[0072] As an optional implementation method, based on the actual stability information and the actual energy accumulation information, the initial pressure relief strategy is adjusted to obtain a target pressure relief strategy, including: based on the actual stability information and the actual energy accumulation information, determining the execution result of the coal rock mass under the initial pressure relief strategy, wherein the execution result includes at least the execution effect and the safety level; based on the execution result, the initial pressure relief strategy is adjusted to obtain the target pressure relief strategy.

[0073] In this embodiment, the execution result of the coal rock mass under the initial decompression strategy is determined by comparing the actual stability information and the actual energy accumulation information with the predicted stability information and the predicted energy accumulation information.

[0074] Optionally, after determining the execution result of the coal rock mass under the initial pressure relief strategy, the optimization parameters are determined, and the initial pressure relief strategy is adjusted to obtain the target pressure relief strategy. The optimization parameters can be to optimize the pressure relief schemes such as long-distance directional drilling, high-pressure water injection, and large-diameter drilling, and determine the location, diameter, length and other parameters of the drilling hole.

[0075] For example, the decompression plan is implemented to reduce the stress concentration of coal and rock mass through engineering techniques such as directional drilling, high-pressure water injection, and large-diameter drilling. During the decompression process, the stress changes and energy conditions of the coal and rock mass are monitored in real time, the decompression effect is evaluated, and adjustments and optimizations are made as needed.

[0076] As an optional implementation method, based on the actual stability information and the actual energy accumulation information, the execution result of the coal rock mass under the initial pressure relief strategy is determined, including: based on the actual stability information and the actual energy accumulation information, the pressure relief information of the coal rock mass is determined, wherein the pressure relief information includes at least: on-site microseismic information, geosound information, electromagnetic radiation information, and stress monitoring information; the pressure relief information is integrated to determine the execution result.

[0077] In this embodiment, the decompression information of the coal rock mass is determined based on the actual stability information and the actual energy accumulation information. For example, during the decompression process, the stress change and energy situation of the coal rock mass, that is, the actual stability information and the actual energy accumulation information, are monitored in real time to evaluate the decompression effect, and adjustments and optimizations are made as needed.

[0078] Optionally, after the pressure relief information is determined, the pressure relief information is integrated to determine the execution result of the pressure relief on the coal rock mass according to the initial pressure relief strategy.

[0079] As an optional implementation manner, the method for determining the control strategy of coalbed gas further includes: storing a target pressure relief strategy.

[0080] In this embodiment, the target pressure relief strategy is stored, for example, in a server.

[0081] Optionally, by storing the target pressure relief strategy, it is convenient for management personnel to monitor and view the pressure relief strategy later.

[0082] It should be noted that the above embodiment can be implemented by a coal crushing and feeding control system.

[0083] In this embodiment, basic data of the coal rock mass is obtained, wherein the basic data is used to simulate the physical and mechanical parameters and / or boundary conditions of the coal rock mass; based on the basic data, the coal rock mass is simulated to obtain simulation results, wherein the simulation results at least include predicted stability information and predicted energy accumulation information; based on the simulation results, an initial pressure relief strategy for the coal rock mass is determined; the coal rock mass is pressure relief according to the initial pressure relief strategy, and actual stability information and actual energy accumulation information of the coal rock mass during the pressure relief process are obtained, wherein the actual stability information is used to indicate the stress distribution of the coal rock mass during the pressure relief process, and the actual energy accumulation information is used to indicate the degree of strain energy accumulation inside the coal rock mass during the pressure relief process; based on the actual stability information and the actual energy accumulation information, the initial pressure relief strategy is adjusted to obtain a target pressure relief strategy. That is to say, the present invention simulates the coal rock mass through the basic data of the coal rock mass to obtain the simulation results, and then adjusts the initial pressure relief strategy according to the simulation results and the actual stability information and actual energy accumulation information of the coal rock mass during the pressure relief process to obtain the target pressure relief strategy, thereby solving the technical problem of being unable to reduce the stress concentration degree of the coal rock mass and achieving the technical effect of reducing the stress concentration degree of the coal rock mass.

[0084] The technical solution of the embodiment of the present invention is illustrated below in conjunction with preferred implementation modes.

[0085] At present, in the field of coal mining, especially when facing steeply inclined and thick coal seams or complex geological conditions, dynamic disasters such as rock burst and rock burst are important threats to mine safety. These dynamic disasters are often caused by stress concentration and energy accumulation in coal and rock masses, posing a serious threat to the life safety of miners and mine facilities. Therefore, how to effectively relieve pressure to reduce the stress concentration of coal and rock masses has become an urgent problem to be solved in mining.

[0086] In the related technology, the traditional pressure relief methods mainly include blasting pressure relief, water injection pressure relief, drilling pressure relief, etc. Among them, although blasting pressure relief can quickly reduce the stress of coal rock mass in a short time, it has the disadvantages of large vibration and great impact on the surrounding environment; water injection pressure relief injects water or other fluids into the coal rock mass to produce cracks and gaps in the coal rock mass, reducing its strength and stress concentration, but the effect and range of water injection are affected by the permeability of the coal rock mass; drilling pressure relief opens a borehole inside the coal rock mass to create a stress release space inside the coal rock mass and reduce the stress concentration, but the size and position of the borehole have a great influence on the pressure relief effect, and it is necessary to optimize the position parameters through numerical simulation methods. Therefore, there is a technical problem that the stress concentration of the coal rock mass cannot be reduced. In view of the above-mentioned technical problem that the stress concentration of the coal rock mass cannot be reduced, no effective solution has been proposed.

[0087] However, the embodiment of the present invention proposes a method for regional and local combined pressure relief and anti-bumping in steeply inclined and extremely thick coal seam tunnels based on numerical simulation, using FLAC3D software to establish a three-dimensional geological model of the coal rock mass, and setting the physical and mechanical parameters and boundary conditions of the model; through numerical simulation analysis, the stress distribution and energy accumulation of the coal rock mass are predicted, and the potential rock burst and rock burst danger areas are determined; according to the simulation results, the pressure relief schemes such as long-distance directional drilling, high-pressure water injection, and large-diameter drilling are designed and optimized, and the position, diameter, length and other parameters of the drilling holes are determined; the pressure relief scheme is implemented, and the stress concentration of the coal rock mass is reduced through engineering and technical means such as directional drilling, high-pressure water injection, and large-diameter drilling; during the pressure relief process, the stress changes and energy conditions of the coal rock mass are monitored in real time, the pressure relief effect is evaluated, and adjustments and optimizations are made as needed; finally, the regional and local combined pressure relief is evaluated through on-site microseismic, ground sound and other monitoring data, so as to timely optimize and adjust the scheme, solve the technical problem that the stress concentration of the coal rock mass cannot be reduced, and achieve the technical effect of reducing the stress concentration of the coal rock mass.

[0088] The embodiments of the present invention are further described below.

[0089] Figure 4 The flowchart of the method for combined pressure relief and anti-bumping in the tunnel area and local area of ​​steeply inclined and extremely thick coal seams based on numerical simulation according to an embodiment of the present invention comprises the following steps:

[0090] Step S401, using FLAC3D software to establish a three-dimensional geological model of the coal rock mass, and setting the physical and mechanical parameters and boundary conditions of the model.

[0091] In this embodiment, if Figure 2 As shown, water injection is implemented to relieve pressure on both sides and the bottom plate of the tunnel ahead of the tunneling head. This technical solution arranges a drilling site behind the tunneling head, constructs long-distance directional holes on the two sides and the top and bottom plates along the direction of the tunneling working face, and then carries out water injection after the drilling construction is completed, thereby realizing dual pressure relief of drilling + high-pressure water injection, and creating a pressure relief protection circle within a certain range around the tunnel, ensuring that the tunnel is always excavated in the pressure relief area, thereby ensuring the safety of tunnel excavation and subsequent operations.

[0092] Alternatively, the effectiveness of the decompression and weakening effect of the tunnel surrounding rock depends mainly on the wetted radius of the coal body under water injection, and the depth of the borehole from the tunnel wall and floor. Coal seam water injection is the study of the movement of water in a complex porous medium, which refers to a porous medium containing a large number of pores of various shapes, sizes, connected or unconnected. Since the water injection borehole is very small compared to the wetted radius, drilling water injection in the coal seam can be simplified to plane radial seepage such as Figure 3 shown.

[0093] Optionally, the medium wetting range R can be calculated by the aforementioned formulas (1) to (5), which will not be described in detail here.

[0094] Optionally, long-distance directional drilling is arranged in the side of the tunnel. The support conditions of the tunnel surrounding rock, that is, the length of the anchor rod, need to be considered. To ensure the anchoring effect of the anchor rod, a certain range of protective layer is reserved outside the anchor rod area. Considering the wetting radius when water is injected into the coal seam, the following formula (6) can be used to express it:

[0095] D=R1+B g +L g (6)

[0096] Where, D is the depth of the borehole from the side, in meters (m); L g is the anchor length, in m; B g is the anchor protection layer, in m; R1 is the water injection influence radius in the coal seam, in m.

[0097] Through the above formula (6), the wet radius R1, Bg, and Lg values ​​are obtained by considering the factors such as the bedding of the coal seam, and the depth of the borehole from the sidewall D is calculated. In the later stage, the depth of the borehole from the sidewall is continuously optimized according to the pressure relief effect, and a good pressure relief effect is achieved without destroying the roadway support anchoring area.

[0098] Optionally, Figure 5 FIG. 1 is a schematic diagram of determining a tunnel side pressure relief parameter according to an embodiment of the present invention. Figure 5 As shown in the figure, the layout of the coal roadway floor in a steeply inclined and thick coal seam should take into account the impact on the lower layer, that is, the thickness of the lower layer roadway, the height of the lower layer roadway, the length of the anchor cable used in the lower layer, the reserved protective layer outside the anchor cable, and the wetting radius when water is injected into the coal seam. It can be expressed by the following formula (7):

[0099] D1=H-H1-L s -B s -R2 (7)

[0100] Among them, D1 is the depth of directional drilling arrangement in the bottom plate, in m; H is the thickness of the lower layer coal seam, in m; H1 is the height of the lower layer roadway, in m; L s Anchor cable length, in m; B s is the anchor cable protection layer, in m; is the water injection influence radius in R2 coal seam, in m.

[0101] Optionally, Figure 6 FIG. 1 is a schematic diagram of determining a tunnel floor pressure relief parameter according to an embodiment of the present invention. Figure 6As shown in the figure, the height of the lower layer is designed to obtain H, and the values ​​of H1, Ls, and Bs are taken (the thickness of the protective layer is appropriately increased considering the factor that water flows to the lower place), and the wet radius R2 is obtained by considering the influence of factors such as coal seam gangue, and the depth D1 of the borehole from the bottom plate is calculated according to the above formula (7). In the later stage, the depth of the borehole from the bottom plate is continuously optimized according to the pressure relief effect, and a good pressure relief effect is achieved without damaging the anchoring area of ​​the roof of the lower layer roadway.

[0102] Optionally, based on the above analysis, a specific design scheme for advance high-pressure water injection around the tunnel is determined, and the length of the advance high-pressure water injection drilling hole is initially determined to be 600m. During the later construction process, it will be comprehensively determined based on whether the drilling hole collapses during on-site construction.

[0103] Step S402, through numerical simulation analysis, predict the stress distribution and energy accumulation of the coal rock mass, and determine the potential rock burst and rock burst danger areas.

[0104] In this embodiment, by analyzing the numerical simulation determined in step S401, the stress distribution and energy accumulation of the coal and rock mass are predicted, and the potential rock burst and rock burst danger areas are determined.

[0105] Step S403: The excavation working face adopts "regional + local" coordinated pressure relief measures. The region adopts advanced high-pressure water injection pressure relief, and the local area adopts large-diameter drilling pressure relief.

[0106] In this embodiment, the excavation working face adopts "regional + local" coordinated pressure relief measures. The region adopts advanced high-pressure water injection to relieve pressure, and the local area adopts large-diameter drilling to relieve pressure.

[0107] Optionally, Figure 7 Schematic diagram of a pressure relief scheme for the area around the tunnel before ultra-high pressure water injection according to an embodiment of the present invention. Figure 7 As shown in the figure, after a large diameter empty hole is arranged in the coal seam, the borehole is deformed and damaged under the action of the surrounding rock stress, and spreads around the coal rock mass with the borehole as the center. According to the degree of damage to the coal rock mass, it can be divided into the surrounding rock fracture zone, plastic deformation zone, and elastic deformation zone. The larger the range of the coal fracture zone and plastic deformation zone, the larger the range of the coal body force compaction, and the coal body strength will decrease. After drilling a borehole into the coal body, the borehole will shrink under the action of the internal stress of the coal body. When the friction of the coal body on the borehole wall exceeds the friction of the coal body, the hole will collapse. The free space generated by the borehole will be filled with the collapsed coal body. Finally, the pressure relief zone centered on the borehole is not the same as the borehole diameter. The properties and occurrence conditions of the coal body will affect the range of the coal fracture zone and the plastic deformation zone. The ratio of the coal body deformation modulus to the original coal body deformation modulus can be called the softening coefficient. The softening coefficient is calculated according to the following formula (8):

[0108]

[0109] Among them, A is the distance of the drilling boundary, in millimeters (mm); E is the diameter of the large diameter empty hole, in mm; L = A + E, the drilling spacing (hole spacing), in mm.

[0110] Optionally, Figure 8 Schematic diagram of a large diameter drilling pressure relief principle according to an embodiment of the present invention. Figure 8 As shown in the figure, after the pressure relief is relieved by drilling in the high-stress coal body, the drilling damage forms a pressure relief circle which is much larger than the diameter of the drilling hole and is formed by the coal body crushing zone and plastic deformation zone. After the pressure relief circles formed by multiple drilling holes are interconnected, a larger pressure relief zone is formed, forming a large-scale weak surface inside the coal body, reducing the peak stress inside the coal body and transferring it to the deep part of the coal body, releasing a large amount of harmful elastic energy accumulated in the coal body due to high stress and eliminating the impact risk.

[0111] Optionally, FIG. 9(a) is a schematic diagram of a large-diameter borehole pressure relief at the side and head of a roadway according to an embodiment of the present invention; FIG. 9(b) is a schematic diagram of another large-diameter borehole pressure relief at the side and head of a roadway according to an embodiment of the present invention; As shown in FIG. 9(a), the reason why rock burst occurs in a high-stress roadway is that under high stress, the coal rock mass surrounding the roadway is relatively hard and can accumulate a large amount of elastic energy, and an impact occurs when the coal rock mass reaches its bearing limit. For such situations, large-diameter borehole pressure relief is mostly used to control rock burst. As shown in FIG. 9(b), hollow hole / blasting pressure relief is generally implemented in hard rock rock burst roadways. The principle is mainly to implement large-diameter hollow holes and borehole blasting pressure relief to transfer the high stress of the roadway surrounding rock side and head to the deep part, while reducing the stress peak of the roadway side and head area, thereby realizing the transfer and regulation of the high stress of the roadway surrounding rock.

[0112] Step S404, evaluating the effects of regional and local combined pressure relief, so as to optimize and adjust the plan in a timely manner.

[0113] In this embodiment, based on the simulation results, the decompression schemes such as long-distance directional drilling, high-pressure water injection, and large-diameter drilling are designed and optimized to determine the location, diameter, length and other parameters of the borehole. The decompression scheme is implemented to reduce the stress concentration of the coal rock mass through engineering and technical means such as directional drilling, high-pressure water injection, and large-diameter drilling. During the decompression process, the stress changes and energy conditions of the coal rock mass are monitored in real time, the decompression effect is evaluated, and adjustments and optimizations are made as needed. Finally, transient electromagnetic detection and hole rotation are combined with on-site microseismic, geoacoustic, electromagnetic radiation, stress monitoring and other data to evaluate the effect of regional and local joint decompression, so as to optimize and adjust the scheme in a timely manner.

[0114] Optionally, the resistivity of the coal body changes before and after the advance high-pressure water injection, and the diffusion radius of the water injection and its pressure relief effect can be analyzed by analyzing the change in the resistivity of the coal body before and after the water injection. As a non-destructive resistivity test method, transient electromagnetic detection is used to evaluate the pressure relief effect of advance high-pressure water injection in long-distance directional drilling. Before the implementation of directional long-distance drilling + high-pressure water injection, the above scheme is used to detect the two sides and the bottom plate of the tunnel once using transient electromagnetic to master the distribution characteristics of the apparent resistivity in the tunnel surrounding rock before pressure relief; after the implementation of directional long-distance drilling + high-pressure water injection, the above scheme is used to detect the two sides and the bottom plate of the tunnel once using transient electromagnetic to master the pressure relief effect of directional long-distance drilling + high-pressure water injection within 100m in front of the tunnel, and the change law of the apparent resistivity of the tunnel surrounding rock in the two detections is compared and analyzed, and the pressure relief effect of long-distance drilling + high-pressure water injection is summarized and analyzed. After the first detection of the pressure relief effect of directional long-distance drilling + high-pressure water injection, the tunnel is detected every 100m, and the pressure relief effect in front of the tunnel is continuously analyzed. After the pressure relief rules and effects of directional long-distance drilling + high-pressure water injection are fully understood, no further detection is required, and parameters such as its impact range and effect are used as the design basis for pressure relief under other similar conditions.

[0115] The borehole peep instrument is used to detect the development of fissures in the borehole before and after the long-distance directional drilling and high-pressure water injection, and to evaluate the pressure relief effect of the long-distance directional drilling and high-pressure water injection. In-hole peep detection and analysis: The mine borehole imager uses the digital imaging technology of borehole television to observe and measure the borehole and generate a three-dimensional digital core map and borehole trajectory map of the borehole; it can be used for coal mine observation and quantitative analysis of the trend, thickness, inclination, inclination angle, interlayer gangue and the degree of separation cracks with the roof rock layer; it is suitable for vertical holes, horizontal holes and inclined holes (depression angle, elevation angle), anchor (rod) holes. The equipment can not only observe various structural structures in the borehole in real time and intuitively, but also can video image the entire borehole, and can form a borehole expansion map and a later three-dimensional columnar map on site to vividly and intuitively reproduce the structure in the hole and conduct quantitative analysis, and conduct peep detection through hydraulic fracturing boreholes and comparison holes, and comprehensively analyze the extension morphology and expansion range of fracturing cracks. According to the structural changes of the coal rock mass, field data is provided for the subsequent drilling high-pressure water injection fracturing plan, which is conducive to timely and effective adjustment of the layout and related parameters of the water injection drilling holes.

[0116] Through the above technical solutions, the stress distribution and energy accumulation of coal and rock mass can be accurately predicted and analyzed, providing a scientific basis for the design and optimization of pressure relief schemes. At the same time, the use of engineering technical means such as directional drilling, high-pressure water injection, and large-diameter drilling can efficiently and accurately reduce the stress concentration of coal and rock mass, prevent and reduce the occurrence of dynamic disasters such as rock bursts, and improve the safety and efficiency of coal mining.

[0117] In this embodiment, FLAC3D software is used to establish a three-dimensional geological model of the coal rock mass, and the physical and mechanical parameters and boundary conditions of the model are set; through numerical simulation analysis, the stress distribution and energy accumulation of the coal rock mass are predicted, and the potential rock burst and rock burst danger areas are determined; according to the simulation results, the pressure relief schemes such as long-distance directional drilling, high-pressure water injection, and large-diameter drilling are designed and optimized, and the position, diameter, length and other parameters of the drilling holes are determined; the pressure relief scheme is implemented, and the stress concentration of the coal rock mass is reduced through engineering and technical means such as directional drilling, high-pressure water injection, and large-diameter drilling; during the pressure relief process, the stress changes and energy conditions of the coal rock mass are monitored in real time, the pressure relief effect is evaluated, and adjustments and optimizations are made as needed; finally, the regional and local combined pressure relief is evaluated through on-site microseismic, ground sound and other monitoring data, so as to timely optimize and adjust the scheme, solve the technical problem of being unable to reduce the stress concentration of the coal rock mass, and achieve the technical effect of reducing the stress concentration of the coal rock mass.

[0118] According to an embodiment of the present invention, a device for determining a pressure relief strategy for a coal-rock mass is also provided. It should be noted that the device for determining a pressure relief strategy for a coal-rock mass can be used to execute the method for determining a pressure relief strategy for a coal-rock mass in the method embodiment.

[0119] Fig.10 Schematic diagram of a device for determining a pressure relief strategy for a coal rock mass according to an embodiment of the present invention. Fig.10 As shown, the device 1000 for determining the pressure relief strategy of the coal rock mass may include: a first acquisition unit 1001 , a simulation unit 1002 , a first determination unit 1003 , a second acquisition unit 1004 and an adjustment unit 1005 .

[0120] The first acquisition unit 1001 is used to acquire basic data of the coal-rock mass, wherein the basic data is used to simulate the physical and mechanical parameters and / or boundary conditions of the coal-rock mass.

[0121] The simulation unit 1002 is used to simulate the coal rock mass based on the basic data to obtain simulation results, wherein the simulation results at least include predicted stability information and predicted energy accumulation information, the predicted stability information is used to indicate the predicted stress distribution of the coal rock mass, and the predicted energy accumulation information is used to indicate the predicted degree of strain energy accumulation inside the coal rock mass.

[0122] The first determination unit 1003 is used to determine an initial pressure relief strategy for the coal-rock mass based on the simulation results, wherein the initial pressure relief strategy is used to indicate a rule for relief of the coal-rock mass.

[0123] The second acquisition unit 1004 is used to unload the coal rock mass according to the initial unloading strategy, and obtain the actual stability information and actual energy accumulation information of the coal rock mass during the unloading process, wherein the actual stability information is used to indicate the stress distribution of the coal rock mass during the unloading process, and the actual energy accumulation information is used to indicate the degree of strain energy accumulation inside the coal rock mass during the unloading process.

[0124] The adjustment unit 1005 is used to adjust the initial pressure relief strategy based on the actual stability information and the actual energy accumulation information to obtain a target pressure relief strategy.

[0125] Optionally, the simulation unit 1002 may include: a prediction module, used to predict a target area of ​​the coal rock mass based on basic data, wherein the target area is used to indicate a potential rock burst and rock burst danger area; a simulation module, used to simulate the coal rock mass based on the target area and basic data to obtain a simulation result.

[0126] Optionally, the second acquisition unit 1004 may include: a first determination module, used to depressurize the coal rock mass according to the initial depressurization strategy, and determine the water injection information during the depressurization process, wherein the water injection information may at least include: the wetting radius of the coal rock mass under water injection, the distance between the borehole and the side of the tunnel and / or the depth between the borehole and the bottom plate; the first acquisition module, used to obtain the actual stability information and actual energy accumulation information of the coal rock mass during the depressurization process based on the water injection information.

[0127] Optionally, the adjustment unit 1005 may include: a second determination module, used to determine the execution result of the coal rock mass under the initial pressure relief strategy based on actual stability information and actual energy accumulation information, wherein the execution result at least includes the execution effect and the degree of safety; an adjustment module, used to adjust the initial pressure relief strategy based on the execution result to obtain a target pressure relief strategy.

[0128] Optionally, the second determination module may include: a first determination submodule, used to determine the pressure relief information of the coal rock mass based on actual stability information and actual energy accumulation information, wherein the pressure relief information includes at least: on-site microseismic information, geosound information, electromagnetic radiation information, and stress monitoring information; a second determination submodule, used to integrate the pressure relief information and determine the execution result.

[0129] Optionally, the device 1000 for determining a pressure relief strategy for a coal rock mass may further include: a storage unit for storing a target pressure relief strategy.

[0130] In this embodiment, basic data of the coal rock mass is obtained, wherein the basic data is used to simulate the physical and mechanical parameters and / or boundary conditions of the coal rock mass; based on the basic data, the coal rock mass is simulated to obtain simulation results, wherein the simulation results at least include predicted stability information and predicted energy accumulation information; based on the simulation results, an initial pressure relief strategy for the coal rock mass is determined; the coal rock mass is pressure relief according to the initial pressure relief strategy, and actual stability information and actual energy accumulation information of the coal rock mass during the pressure relief process are obtained, wherein the actual stability information is used to indicate the stress distribution of the coal rock mass during the pressure relief process, and the actual energy accumulation information is used to indicate the degree of strain energy accumulation inside the coal rock mass during the pressure relief process; based on the actual stability information and the actual energy accumulation information, the initial pressure relief strategy is adjusted to obtain a target pressure relief strategy. That is to say, the present invention simulates the coal rock mass through the basic data of the coal rock mass to obtain the simulation results, and then adjusts the initial pressure relief strategy according to the simulation results and the actual stability information and actual energy accumulation information of the coal rock mass during the pressure relief process to obtain the target pressure relief strategy, thereby solving the technical problem of being unable to reduce the stress concentration degree of the coal rock mass and achieving the technical effect of reducing the stress concentration degree of the coal rock mass.

[0131] According to an embodiment of the present invention, a computer-readable storage medium is further provided, the storage medium comprising a stored program, wherein the program executes the method for determining the decompression strategy of the coal rock mass in the method embodiment.

[0132] According to an embodiment of the present invention, a processor is further provided, the processor being used to run a program, wherein when the program is run, the method for determining a decompression strategy for a coal rock mass in the method embodiment is executed.

[0133] According to an embodiment of the present invention, a computer program product is also provided. The computer program product includes computer instructions. When the computer instructions are executed by a processor, the method for determining the decompression strategy of the coal rock mass in the method embodiment is implemented.

[0134] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0135] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0136] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0137] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed over multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0138] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0139] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent functional component, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software functional component, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk, etc., which can store program codes.

[0140] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for determining a pressure relief strategy for a coal rock mass, characterized in that: include: Acquiring basic data of the coal-rock mass, wherein the basic data is used to simulate the physical and mechanical parameters and / or boundary conditions of the coal-rock mass; Based on the basic data, the coal rock mass is simulated to obtain simulation results, wherein the simulation results at least include predicted stability information and predicted energy accumulation information, the predicted stability information is used to indicate the predicted stress distribution of the coal rock mass, and the predicted energy accumulation information is used to indicate the predicted strain energy accumulation degree inside the coal rock mass; Based on the simulation results, determining an initial pressure relief strategy for the coal-rock mass, wherein the initial pressure relief strategy is used to indicate a rule for relief of the coal-rock mass; Depressurizing the coal rock mass according to the initial depressurization strategy, and obtaining actual stability information and actual energy accumulation information of the coal rock mass during the depressurization process, wherein the actual stability information is used to indicate the stress distribution of the coal rock mass during the depressurization process, and the actual energy accumulation information is used to indicate the degree of strain energy accumulation inside the coal rock mass during the depressurization process; Based on the actual stability information and the actual energy accumulation information, the initial pressure relief strategy is adjusted to obtain a target pressure relief strategy.

2. The method according to claim 1, characterized in that Based on the basic data, the coal rock mass is simulated to obtain simulation results, including: Based on the basic data, predicting the target area of ​​the coal rock mass, wherein the target area is used to indicate a potential rock burst and rock burst danger area; Based on the target area and the basic data, the coal rock mass is simulated to obtain the simulation result.

3. The method according to claim 1, characterized in that Depressurizing the coal-rock mass according to the initial depressurization strategy, and obtaining actual stability information and actual energy accumulation information of the coal-rock mass during the depressurization process, including: Depressurize the coal-rock mass according to the initial depressurization strategy, and determine water injection information during the depressurization process, wherein the water injection information may at least include: the wetting radius of the coal-rock mass under water injection, the distance between the borehole and the roadway wall, and / or the depth between the borehole and the bottom plate; Based on the water injection information, the actual stability information and actual energy accumulation information of the coal rock mass during the pressure relief process are obtained.

4. The method according to claim 1, characterized in that: Based on the actual stability information and the actual energy accumulation information, adjusting the initial pressure relief strategy to obtain a target pressure relief strategy includes: Based on the actual stability information and the actual energy accumulation information, determining the execution result of the coal-rock mass under the initial pressure relief strategy, wherein the execution result at least includes the execution effect and the safety degree; Based on the execution result, the initial pressure relief strategy is adjusted to obtain the target pressure relief strategy.

5. The method according to claim 4, characterized in that Based on the actual stability information and the actual energy accumulation information, determining the execution result of the coal rock mass under the initial pressure relief strategy includes: Based on the actual stability information and the actual energy accumulation information, the decompression information of the coal-rock mass is determined, wherein the decompression information at least includes: on-site microseismic information, geosound information, electromagnetic radiation information, and stress monitoring information; The pressure relief information is integrated to determine the execution result.

6. The method according to claim 1, characterized in that The method further comprises: The target pressure relief strategy is stored.

7. A device for determining a control strategy for coalbed gas, characterized in that: include: A first acquisition unit is used to acquire basic data of the coal rock mass, wherein the basic data is used to simulate the physical and mechanical parameters and / or boundary conditions of the coal rock mass; a simulation unit, configured to simulate the coal rock mass based on the basic data to obtain a simulation result, wherein the simulation result at least includes predicted stability information and predicted energy accumulation information, the predicted stability information is used to indicate a predicted stress distribution of the coal rock mass, and the predicted energy accumulation information is used to indicate a predicted degree of strain energy accumulation inside the coal rock mass; A first determining unit is used to determine an initial pressure relief strategy for the coal-rock mass based on the simulation result, wherein the initial pressure relief strategy is used to indicate a rule for relief of the coal-rock mass; a second acquisition unit, configured to decompress the coal-rock mass according to the initial decompression strategy, and acquire actual stability information and actual energy accumulation information of the coal-rock mass during the decompression process, wherein the actual stability information is used to indicate the stress distribution of the coal-rock mass during the decompression process, and the actual energy accumulation information is used to indicate the degree of strain energy accumulation inside the coal-rock mass during the decompression process; An adjustment unit is used to adjust the initial pressure relief strategy based on the actual stability information and the actual energy accumulation information to obtain a target pressure relief strategy.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein when the program is executed by a processor, the device where the storage medium is located is controlled to execute the method according to any one of claims 1 to 6.

9. A processor, characterized in that: The processor is used to run a program, wherein the program executes the method according to any one of claims 1 to 6 when running.

10. A computer program product, characterized in that The computer program product comprises computer instructions, which implement the method according to any one of claims 1 to 6 when executed by a processor.

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