Pressure relief effect evaluation method, apparatus, medium, device, and program

Abstract

The invention relates to a pressure relief effect evaluation method and device, a medium, equipment and a program, and relates to the technical field of coal mine safety mining, and the method comprises the following steps: determining a stress superposition space of a working face as a target space, the stress superposition space being a space where advance bearing pressure in front of the working face and concentrated stress of a roadway side part are mutually superposed; according to the stress value of each node in the target space before and after pressure relief, target stress indexes before and after pressure relief are determined, the target space comprises a plurality of discrete nodes, and the nodes are uniformly distributed in the target space and used for representing the stress distribution condition of the target space; and evaluating the pressure relief effect according to the change condition of the target stress index before and after pressure relief. The method can improve the evaluation efficiency and accuracy of the pressure relief effect.

Description

Technical Field

[0001] This application relates to the field of safe coal mining, and specifically, to a method, device, medium, equipment, and program for evaluating the pressure relief effect. Background Art

[0002] With the deep mining of coal resources, the problem of rock burst becomes increasingly prominent in mine safety. Through effective pressure relief measures, the stress state can be controlled, the stability of the roadway can be improved, and the threat of rock burst can be reduced. Accurately evaluating the pressure relief effect is the key to ensuring the stability of the roadway and assessing rock burst.

[0003] In related pressure relief effect evaluation methods, multiple factors such as overlying stress, lateral pressure coefficient, coal seam properties, and borehole parameters usually need to be considered for calculation and analysis. The calculation is complex and often affected by simplified processing, resulting in large uncertainties and errors in the evaluation results and making it difficult to truly reflect the actual working conditions. Summary of the Invention

[0004] To overcome the problems existing in the related art, this application provides a method, device, medium, equipment, and program for evaluating the pressure relief effect.

[0005] According to the first aspect of this application, a method for evaluating the pressure relief effect is provided, including: Determine the stress superposition space of the working face as the target space, where the stress superposition space is the space where the advanced abutment pressure in front of the working face and the concentrated stress on the roadway rib are superimposed on each other; According to the stress values of each node in the target space before and after pressure relief, determine the target stress indicators before and after pressure relief. The target space includes a plurality of discrete nodes, and the nodes are evenly distributed in the target space and are used to characterize the stress distribution of the target space; Evaluate the pressure relief effect according to the change of the target stress indicators before and after pressure relief.

[0006] Optionally, the determining the stress superposition space of the working face as the target space includes: Determine the height of the target space according to the vertical distance between the roadway floor and the roadway roof; Determine the length of the target space according to the horizontal distance from the peak point of the superimposed stress to the goaf boundary; Determine the width of the target space according to the horizontal distance from the peak point of the superimposed stress to the roadway rib. The peak point of the superimposed stress is the maximum stress point formed by the superposition of the advanced abutment pressure in front of the working face and the concentrated stress on the roadway rib.

[0007] Optionally, the stress indicators include stress mean, maximum stress value, stress standard deviation, and stress distribution skewness.

[0008] Optionally, evaluating the pressure relief effect according to the change of the target stress index before and after pressure relief includes: When the stress mean value, the maximum stress value, the stress standard deviation, and the stress distribution skewness are all smaller after pressure relief than before pressure relief, it is determined that the pressure relief effect is good.

[0009] Optionally, the method further includes: When the horizontal distance from the peak point of the superimposed stress to the goaf boundary is larger after pressure relief than before pressure relief, it is determined that the pressure relief effect is good, and the peak point of the superimposed stress is the maximum stress point formed by the superposition of the advanced abutment pressure in front of the working face and the concentrated stress on the roadway rib.

[0010] Optionally, determining the stress superposition space of the working face as the target space includes: Based on the numerical simulation method, establish a pressure relief model for the working face; Determine the stress superposition space in the working face pressure relief model as the target space; Before determining the target stress index before and after pressure relief according to the stress values of each node in the target space before and after pressure relief, it includes: According to the working face pressure relief model, simulate the pressure relief process to obtain the stress values of each node in the target space before and after pressure relief.

[0011] According to the second aspect of the present application, a pressure relief effect evaluation device is provided, including: A target space determination module for determining the stress superposition space of the working face as the target space, where the stress superposition space is the space where the advanced abutment pressure in front of the working face and the concentrated stress on the roadway rib are superimposed on each other; A stress index determination module for determining the target stress index before and after pressure relief according to the stress values of each node in the target space before and after pressure relief, where the target space includes a plurality of discrete nodes, and the nodes are evenly distributed in the target space and are used to characterize the stress distribution of the target space; A first pressure relief effect evaluation module for evaluating the pressure relief effect according to the change of the target stress index before and after pressure relief.

[0012] According to the third aspect of the present application, a non-transitory computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the steps of any of the methods provided in the first aspect of the present application are implemented.

[0013] According to the fourth aspect of the present application, an electronic device is provided, including: A memory on which a computer program is stored; A processor for executing the computer program in the memory to implement the steps of any of the methods provided in the first aspect of the present application.

[0014] According to a fifth aspect of the present application, there is provided a computer program which, when executed by a processor, implements the steps of any of the methods provided in the first aspect of the present application.

[0015] Through the above technical solution, the stress superposition space of the working face is determined as the target space, which is located in the space where the advanced abutment pressure in front of the working face and the concentrated stress on the roadway side are superposed on each other. It is a key area where rock strata instability and rock burst are likely to occur. Precise positioning can improve the pertinence and practicality of the evaluation results; using a plurality of uniformly distributed discrete nodes to characterize the stress distribution of the target space can comprehensively and meticulously reflect the stress state of the entire space, and can avoid the one-sidedness that may be caused by relying only on data at a few points, thereby improving the accuracy and reliability of the evaluation. By evaluating the pressure relief effect, this method can timely detect the problem of insufficient pressure relief. Such preventive evaluation can help engineering personnel timely adjust the pressure relief plan, prevent possible rock burst accidents, maintain the stability of the roadway, and improve the safety of coal mine mining.

[0016] Other features and advantages of the present application will be described in detail in the subsequent specific implementation section. Description of the Drawings

[0017] The drawings are used to provide a further understanding of the present application, and constitute a part of the specification. They are used together with the following specific implementation to explain the present application, but do not constitute a limitation to the present application. In the drawings: Figure 1 is a flowchart of a method for evaluating pressure relief effect shown according to an exemplary embodiment; Figure 2 is a top view of a working face with large-diameter borehole pressure relief shown according to an exemplary embodiment; Figure 3 is a central axis sectional view of a roadway with large-diameter borehole pressure relief shown according to an exemplary embodiment; Figure 4 is a stress distribution nephogram before pressure relief of the working face shown according to an exemplary embodiment; Figure 5 is a schematic diagram of the superposition stress distribution before pressure relief of the working face shown according to an exemplary embodiment; Figure 6 is a structural diagram of a device for evaluating pressure relief effect shown according to an exemplary embodiment; Figure 7 is a block diagram of an electronic device shown according to an exemplary embodiment. Detailed Description of the Invention

[0018] The following will describe in detail the specific embodiments of the present application with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present application, and are not used to limit the present application.

[0019] It should be noted that all actions of obtaining signals, information or data in the present application are carried out on the premise of complying with the corresponding data protection regulations and policies of the country where the location is located and obtaining the authorization given by the owner of the corresponding device.

[0020] In this article, terms such as "first" and "second" are only used to distinguish one element from another, and do not require or imply any actual relationship or order between these elements. In fact, the first element can also be called the second element, and vice versa. The term "comprising" is intended to cover non-exclusive inclusion, so that data, structures, devices including a series of elements not only include those elements, but also other elements not explicitly listed. Unless otherwise specified, the term "plurality" means two or more.

[0021] It should be understood that although the steps in the flowchart are shown in sequence according to the indication of the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, at least a part of the steps in the figure may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least a part of other steps or sub-steps or stages of other steps.

[0022] Figure 1 is a flowchart of a method for evaluating the pressure relief effect shown according to an exemplary embodiment. Referring to Figure 1 , this method can be applied to various pressure relief technologies adopted under different geological conditions, including the following steps: In step 110, determine the stress superposition space of the working face as the target space, where the stress superposition space is the space where the advanced abutment pressure in front of the working face and the concentrated stress on the roadway rib are superposed on each other; In step 120, according to the stress values of each node in the target space before and after pressure relief, determine the target stress index before and after pressure relief. The target space may include a plurality of discrete nodes, and the nodes are evenly distributed in the target space to represent the stress distribution of the target space; In step 130, evaluate the pressure relief effect according to the change of the target stress index before and after pressure relief.

[0023] Here, the working face refers to the coal mining area in coal mine exploitation, including the exploited working face (mining face) and the working face to be exploited. The target space specifically refers to the stress superposition space determined for evaluating the pressure relief effect in this application. The advanced abutment pressure refers to the stress concentration area formed in front of the working face due to coal mining activities. The roadway refers to two passageways in the mining face, and the roadway rib refers to the sidewall part of the roadway. This application only analyzes a certain roadway in front of the working face, and the analysis of the other roadway is the same. The concentrated stress refers to the high-stress area formed due to the redistribution of stress caused by excavation in the roadway rib. The node refers to the discrete calculation points set in the target space for obtaining stress values. The target stress index refers to the stress-related parameters used to evaluate the pressure relief effect, which can include the stress mean value, the maximum stress value, the stress standard deviation, and the stress distribution skewness, etc.

[0024] It should be understood that through numerical simulation or on-site measurement, the influence range of the advanced abutment pressure in front of the working face can be determined, and at the same time, the distribution range of the concentrated stress in the roadway rib can be determined. The overlapping part of these two stress influence areas is defined as the target space. Exemplarily, assume that in a certain coal mine, through numerical simulation, it is found that the influence range of the advanced abutment pressure is 13 meters in front of the working face, and the influence range of the concentrated stress in the roadway rib is 5 meters from the roadway wall surface. Then, the overlapping area of 13 meters in front of the working face and 5 meters of the roadway rib can be determined as the target space.

[0025] Computing nodes can be evenly arranged in the target space. For example, the target space is divided into grids of the same shape and size, and the intersections of the grids form nodes. Then, record the stress values of each node before pressure relief, perform pressure relief operations (such as borehole pressure relief), and record the stress values of each node after pressure relief. Calculate the target stress index according to the node stress values. Exemplarily, assume that 1000 nodes are arranged in the determined target space. Record the stress values of these 1000 nodes before and after pressure relief respectively, and then calculate the target stress indexes such as the stress mean value, the maximum stress value, the stress standard deviation, and the stress distribution skewness. Compare the target stress indexes before and after pressure relief to judge the pressure relief effect.

[0026] Through the above technical solution, the stress superposition space of the working face is determined as the target space. This target space is located in the space where the advanced abutment pressure in front of the working face and the concentrated stress on the roadway rib are superimposed on each other, and it is a key area where rock strata instability and rock bursts are extremely likely to occur. Precise positioning can improve the pertinence and practicality of the evaluation results; using a number of uniformly distributed discrete nodes to characterize the stress distribution of the target space can comprehensively and meticulously reflect the stress state of the entire space, avoid one-sidedness that may be caused by relying only on data at a few points, and thus improve the accuracy and reliability of the evaluation. By evaluating the pressure relief effect, this method can timely detect problems of insufficient pressure relief. This preventive assessment can help engineering personnel timely adjust the pressure relief plan, prevent possible rock burst accidents, maintain the stability of the roadway, and improve the safety of coal mine mining.

[0027] In one embodiment, step 110 may include: establishing a working face pressure relief model based on the numerical simulation method; determining the stress superposition space in the working face pressure relief model as the target space; before step 120, it may include: according to the working face pressure relief model, simulating the pressure relief process to obtain the stress values of each node in the target space before and after pressure relief.

[0028] Here, numerical calculations are performed using a computer to simulate the physical process of actual working face pressure relief to obtain a working face pressure relief model. The working face pressure relief model is a digital model established based on actual geological conditions and mining parameters, and is used to simulate the stress distribution and changes around the working face. In the working face pressure relief model, the stress superposition space is the space where the advanced abutment pressure in front of the simulated working face and the concentrated stress on the roadway rib are superimposed on each other. The process of simulating actual pressure relief operations (such as borehole pressure relief) is carried out in the working face pressure relief model.

[0029] It should be understood that actual geological data, including rock stratum distribution, physical and mechanical parameters, etc., can be collected to determine mining parameters such as working face size, mining depth, support method, etc. Then, a three-dimensional numerical model corresponding to the working face pressure relief model is established using numerical simulation software (such as FLAC3D). For example, assume that a coal mine working face is 200 meters long, 50 meters wide, and 500 meters deep. Use FLAC3D software to establish a three-dimensional model containing multiple geological layers, and the model size is 500m×300m×100m.

[0030] Run the initial calculation in the established model to obtain the initial stress distribution. Analyze the distribution of the advanced abutment pressure in front of the working face and the stress concentration area on the roadway rib, and determine the overlapping part of these two areas as the target space. Example: Through model analysis, it is found that the advanced abutment pressure is mainly distributed within 13 meters in front of the working face, and the stress on the roadway rib is concentrated within 5 meters from the roadway wall surface. The intersection of these two areas is determined as the target space, with a size of approximately 13m×5m×10m (height).

[0031] Suppose that during the coal face extraction period, the large-diameter borehole pressure relief technology is adopted for roadway borehole pre-pressure relief, and large-diameter boreholes are constructed on both sides of the roadway. Figure 2 It is a top view of the working face using large-diameter borehole pressure relief shown according to an exemplary embodiment. Figure 3 It is a central longitudinal section of the roadway using large-diameter borehole pressure relief shown according to an exemplary embodiment. As Figure 2 and Figure 3 shown, a large-diameter borehole is implemented every 2 m in the roadway. The borehole is perpendicular to the solid coal rib, 0.5 - 1.5 m away from the roadway floor. The aperture of the large-diameter borehole is 150 mm, and the hole depth on the solid coal side is not less than 25 m. Before the coal face extraction, large-diameter borehole pressure relief is implemented in the range of 200 m in front of the working face in advance. After determining the corresponding pressure relief scheme, set the pressure relief parameters in the model, such as the position, diameter, depth, etc. of the pressure relief boreholes, run the simulation program, simulate the pressure relief process, and record the stress values of each node in the target space before and after pressure relief. Exemplarily, run the simulation program to obtain the stress values of about 650 nodes (assuming the grid size is 1 m, and the target space size of 13 m × 5 m × 10 m corresponds to 650 nodes) in the target space before and after pressure relief.

[0032] Exemplarily, use FLAC3D simulation software to establish a working face pressure relief model, and evaluate the large-diameter borehole pressure relief effect through the change of the target stress index in the target space before and after pressure relief. In addition to outputting the target stress index of the target space before and after pressure relief in a visual form such as graphs. It is also possible to generate a stress distribution nephogram of the working face before and after pressure relief according to the stress values of the working face before and after pressure relief, so as to more intuitively display the change of stress values. Figure 4 It is a stress distribution nephogram of the working face before pressure relief shown according to an exemplary embodiment. As Figure 4 shown, the size of the gray scale in the figure reflects the magnitude of the stress. It can be observed that within the range of 13 m in front of the coal face extraction and within the range of 5 m from the roadway wall, the gray scale values are significantly higher, indicating that there is a high stress superposition in these areas.

[0033] Through the pressure relief effect evaluation method based on numerical simulation, more accurate and comprehensive evaluation results can be obtained by combining the theoretical model and actual parameters.

[0034] In one embodiment, step 110 may include: determining the height of the target space according to the vertical distance between the roadway floor and the roadway roof; determining the length of the target space according to the horizontal distance from the peak point of the superimposed stress to the goaf boundary; determining the width of the target space according to the horizontal distance from the peak point of the superimposed stress to the roadway rib, and the peak point of the superimposed stress is the maximum stress point formed by the superposition of the advanced abutment pressure in front of the working face and the concentrated stress of the roadway rib.

[0035] Here, the roadway floor refers to the bottom of the roadway, that is, the part of the roadway in contact with the ground. The roadway roof refers to the top of the roadway, that is, the ceiling of the roadway. The goaf refers to the area where coal mining has been completed. The goaf boundary refers to the interface between the goaf and the unmined area.

[0036] It should be understood that by numerically simulating or field-measuring the vertical distance from the roadway floor to the roof, this distance is set as the height of the target space. By numerical simulation or field measurement, the position of the peak point of the superimposed stress is found. Measure the horizontal distance from this peak point to the goaf boundary, and set this distance as the length of the target space. Measure the horizontal distance from the peak point of the superimposed stress to the roadway rib, and set this distance as the width of the target space. Finally, the specific position of the target space can be determined, that is, centered on the peak point of the superimposed stress, extending backward to the goaf boundary along the working face advancing direction; extending the width of the target space from the roadway rib towards the working face direction; extending the height of the target space from the roadway floor upwards.

[0037] Figure 5 It is a schematic diagram of the superimposed stress distribution before the working face pressure relief shown according to an exemplary embodiment. As Figure 5 shown, the length and width of the target space are respectively the lengths L1 and L2 corresponding to the positions from the goaf boundary and the roadway rib to the peak point of the stress (the maximum value point after the superposition of the σ1 curve and the σ2 curve in the figure).

[0038] By accurately defining the size of the target space, stress analysis and pressure relief effect evaluation can be carried out for the key area in front of the working face; at the same time, considering the interaction between the advanced abutment pressure and the roadway stress concentration, the peak point of the stress superposition is determined, which can more comprehensively reflect the actual stress distribution, thereby improving the accuracy of the pressure relief effect evaluation.

[0039] In one embodiment, the stress index may include stress mean, maximum stress value, stress standard deviation, and stress distribution skewness.

[0040] Here, the stress mean is the average of the stress values of all nodes within the target space. The stress mean represents the average stress level within the target space. The smaller the stress mean, the more uniform the stress distribution. Based on the evenly distributed nodes set within the target space, the stress value of each node is obtained through numerical simulation or field measurement. Add up the stress values of all nodes, and then divide by the total number of nodes to obtain the stress mean. Specifically, the stress mean can be calculated according to the following formula (1).

[0041] (1) Where, is the stress mean, is the stress value of the i-th node within the target space, and V is the number of nodes.

[0042] The maximum stress value is the maximum among the stress values of all nodes in the target space. The maximum stress value characterizes the degree of stress concentration in the target space. The smaller the maximum stress value, the smaller the stress concentration. Specifically, the maximum stress value can be calculated according to the following formula (2).

[0043] (2) where is the maximum stress value, is the stress value of the i-th node in the target space.

[0044] The stress standard deviation is a statistic of the degree of dispersion of the stress value distribution, reflecting the concentration or dispersion degree of the stress distribution. The smaller the stress standard deviation, the more uniform the stress distribution. The difference between the stress value of each node and the mean value can be calculated, and after squaring these differences and summing them up, dividing by the number of nodes, and then taking the square root, the stress standard deviation is obtained. Specifically, the stress standard deviation can be calculated according to the following formula (3).

[0045] (3) where is the stress standard deviation, is the stress value of the i-th node in the target space, is the stress mean value, and N is the number of nodes.

[0046] The stress distribution skewness is a statistic that describes the degree of skewness of the stress distribution form, reflecting the symmetry of the stress distribution. The stress distribution skewness close to 0 indicates that the stress distribution is relatively symmetric. The sum of the cubes of the differences between the stress values of each node and the mean value can be calculated, and dividing by the product of the number of nodes and the cube of the standard deviation, the stress distribution skewness is obtained. Specifically, the stress distribution skewness can be calculated according to the following formula (4).

[0047] (4) where Skewness is the stress distribution skewness, is the stress value of the i-th node in the target space, is the stress mean value, is the stress standard deviation, and N is the number of nodes.

[0048] By comparing the changes in the above multiple target stress indices before and after pressure relief, the trend of the pressure relief effect can be clearly shown. Among them, the stress mean value can intuitively reflect the pressure relief effect; the change in the maximum stress value can help identify potential high-risk areas; the change in the stress standard deviation can reflect the improvement degree of the stress distribution uniformity; the change in the stress distribution skewness can help detect abnormal situations in the stress distribution.

[0049] In one embodiment, step 130 may include: determining that the pressure relief effect is good when the stress mean value, the maximum stress value, the stress standard deviation, and the stress distribution skewness are all smaller after pressure relief than before pressure relief.

[0050] It should be understood that by comparing the changes in stress statistics before and after pressure relief, the effect of pressure relief can be quantitatively evaluated. If all four statistics decrease, it indicates that the stress level, concentration, and distribution have all been improved, indicating a good pressure relief effect. Specifically, when the pressure relief effect is good, the stress mean value decreases, the maximum stress value decreases, the stress standard deviation decreases, and the stress distribution skewness decreases.

[0051] This method objectively quantifies the pressure relief effect and improves the accuracy and reliability of the evaluation.

[0052] In one embodiment, the method may further include: determining that the pressure relief effect is good when the horizontal distance from the superimposed stress peak point to the goaf boundary is greater after pressure relief than before pressure relief, where the superimposed stress peak point is the maximum stress point formed by the superposition of the advanced abutment pressure in front of the working face and the concentrated stress at the roadway rib.

[0053] It should be understood that first, determine the position of the superimposed stress peak point before pressure relief. The position of the superimposed stress peak point before pressure relief can be determined through numerical simulation or on-site measurement, and measure the horizontal distance from this point to the goaf boundary. Suppose the superimposed stress peak point is 20 meters away from the goaf boundary before pressure relief. After the pressure relief operation, determine the position of the superimposed stress peak point after pressure relief, and again determine the new position of the superimposed stress peak point after pressure relief through numerical simulation or on-site measurement, and measure the horizontal distance from the new peak point to the goaf boundary. Suppose the superimposed stress peak point is 25 meters away from the goaf boundary after pressure relief. If the distance after pressure relief is greater than the distance before pressure relief, it is determined that the pressure relief effect is good. In this example, the distance has increased by 5 meters, so it can be determined that the pressure relief effect is good.

[0054] The change in the peak point position can intuitively reflect the improvement of the stress distribution and can simply, intuitively, and effectively evaluate the pressure relief effect.

[0055] Figure 6 FIG. 600 is a structural diagram of a pressure relief effect evaluation device shown according to an exemplary embodiment. Refer to Figure 6 , the pressure relief effect evaluation device includes: A target space determination module 610, configured to determine the stress superposition space of the working face as the target space, where the stress superposition space is the space formed by the superposition of the advanced abutment pressure in front of the working face and the concentrated stress at the roadway rib; A stress index determination module 620, configured to determine the target stress indexes before and after pressure relief according to the stress values of each node in the target space before and after pressure relief. The target space includes a plurality of discrete nodes, and the nodes are evenly distributed in the target space to characterize the stress distribution of the target space. A first pressure relief effect evaluation module 630, configured to evaluate the pressure relief effect according to the change of the target stress indexes before and after pressure relief.

[0056] Optionally, the target space determination module 610 is configured to: Determine the height of the target space according to the vertical distance between the roadway floor and the roadway roof. Determine the length of the target space according to the horizontal distance between the peak point of the superimposed stress and the goaf boundary. Determine the width of the target space according to the horizontal distance between the peak point of the superimposed stress and the roadway rib. The peak point of the superimposed stress is the maximum stress point formed by the superposition of the advanced abutment pressure in front of the working face and the concentrated stress of the roadway rib.

[0057] Optionally, the stress indexes include stress mean value, maximum stress value, stress standard deviation, and stress distribution skewness.

[0058] Optionally, the first pressure relief effect evaluation module 630 is configured to: Determine that the pressure relief effect is good when the stress mean value, maximum stress value, stress standard deviation, and stress distribution skewness are all smaller after pressure relief than before pressure relief.

[0059] Optionally, the device further includes a second pressure relief effect evaluation module, configured to: Determine that the pressure relief effect is good when the horizontal distance between the peak point of the superimposed stress and the goaf boundary is larger after pressure relief than before pressure relief. The peak point of the superimposed stress is the maximum stress point formed by the superposition of the advanced abutment pressure in front of the working face and the concentrated stress of the roadway rib.

[0060] Optionally, the target space determination module 610 is configured to: Establish a working face pressure relief model based on the numerical simulation method. Determine that the stress superposition space in the working face pressure relief model is the target space. The pressure relief effect evaluation device includes a stress value determination module, configured to: Simulate the pressure relief process according to the working face pressure relief model, and obtain the stress values of each node in the target space before and after pressure relief.

[0061] Regarding the device in the above embodiments, the specific manner in which each module performs operations has been described in detail in the embodiments related to the method, and will not be elaborated here.

[0062] Figure 7 is a block diagram of an electronic device 700 shown according to an exemplary embodiment. As Figure 7 shown, the electronic device 700 may include: a processor 701, a memory 702. The electronic device 700 may further include one or more of a multimedia component 703, an input / output (I / O) interface 704, and a communication component 705.

[0063] Among them, the processor 701 is used to control the overall operation of the electronic device 700 to complete all or part of the steps in the above pressure relief effect evaluation method. The memory 702 is used to store various types of data to support the operation of the electronic device 700. These data may include, for example, instructions for any application or method operating on the electronic device 700, as well as application-related data, such as contact data, received and sent messages, pictures, audio, video, and so on. The memory 702 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disc. The multimedia component 703 may include a screen and an audio component. Among them, the screen may be a touch screen, and the audio component is used to output and / or input audio signals. For example, the audio component may include a microphone, and the microphone is used to receive external audio signals. The received audio signals may be further stored in the memory 702 or sent through the communication component 705. The audio component also includes at least one speaker for outputting audio signals. The I / O interface 704 provides an interface between the processor 701 and other interface modules, and the above other interface modules may be a keyboard, a mouse, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 705 is used for wired or wireless communication between the electronic device 700 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, near field communication (NFC), 2G, 3G, 4G, NB-IOT, eMTC or other 5G, etc., or a combination of one or more of them, is not limited here. Therefore, the corresponding communication component 705 may include: a Wi-Fi module, a Bluetooth module, an NFC module, and so on.

[0064] In an exemplary embodiment, the electronic device 700 can be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors or other electronic components, and is used to execute the above-mentioned method for evaluating the pressure relief effect.

[0065] In another exemplary embodiment, a computer-readable storage medium including program instructions is further provided. When the program instructions are executed by a processor, the steps of the above-mentioned method for evaluating the pressure relief effect are implemented. For example, the computer-readable storage medium can be the above-mentioned memory 702 including program instructions, and the above-mentioned program instructions can be executed by the processor 701 of the electronic device 700 to complete the above-mentioned method for evaluating the pressure relief effect.

[0066] In another exemplary embodiment, a computer program is further provided. The computer program product is a computer program that can be executed by a programmable device, and the computer program has a code part for executing the above-mentioned method for evaluating the pressure relief effect when executed by the programmable device.

[0067] The preferred embodiments of the present application have been described in detail above with reference to the accompanying drawings. However, the present application is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present application, various simple modifications can be made to the technical solutions of the present application, and these simple modifications all belong to the protection scope of the present application.

[0068] In addition, it should be noted that, in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present application does not separately describe various possible combination methods.

[0069] In addition, any combination can be made between various different embodiments of the present application as long as it does not violate the idea of the present application, and it should also be regarded as the content disclosed in the present application.

Claims

1. A method for evaluating pressure relief effect, characterized in that: include: Determine the stress superposition space of the working face as the target space, wherein the stress superposition space is the space where the advance support pressure in front of the working face and the concentrated stress of the tunnel side are superimposed on each other; Determining a target stress index before and after pressure relief according to the stress value of each node in the target space before and after pressure relief, wherein the target space includes a plurality of discrete nodes, and the nodes are evenly distributed in the target space, and are used to characterize the stress distribution of the target space; The pressure relief effect is evaluated based on the changes in the target stress index before and after the pressure relief.

2. The method according to claim 1, characterized in that The step of determining the stress superposition space of the working surface as the target space includes: Determine the height of the target space according to the vertical distance between the tunnel bottom plate and the tunnel top plate; Determine the length of the target space according to the horizontal distance from the superimposed stress peak point to the boundary of the goaf; The width of the target space is determined according to the horizontal distance from the superimposed stress peak point to the tunnel side. The superimposed stress peak point is the maximum stress point formed by the superposition of the advance support pressure in front of the working face and the concentrated stress of the tunnel side.

3. The method according to claim 1, characterized in that The stress indicators include stress mean, maximum stress value, stress standard deviation and stress distribution skewness.

4. The method according to claim 3, characterized in that The step of evaluating the pressure relief effect according to the change of the target stress index before and after the pressure relief comprises: When the stress mean value, the maximum stress value, the stress standard deviation and the stress distribution skewness are all smaller after the pressure relief than before the pressure relief, it is determined that the pressure relief effect is good.

5. The method according to any one of claims 1 to 4, characterized in that: The method further comprises: When the horizontal distance from the superimposed stress peak point to the boundary of the goaf is larger after pressure relief than before pressure relief, it is determined that the pressure relief effect is good. The superimposed stress peak point is the maximum stress point formed by the superposition of the advance support pressure in front of the working face and the concentrated stress of the side of the tunnel.

6. The method according to any one of claims 1 to 4, characterized in that: The step of determining the stress superposition space of the working surface as the target space includes: Based on the numerical simulation method, a working face pressure relief model is established; Determine the stress superposition space in the working face pressure relief model as the target space; Before determining the target stress index before and after pressure relief according to the stress value of each node in the target space before and after pressure relief, the method includes: According to the working face pressure relief model, the pressure relief process is simulated to obtain the stress value of each node in the target space before and after the pressure relief.

7. A pressure relief effect evaluation device, characterized in that: include: A target space determination module is used to determine the stress superposition space of the working face as the target space, wherein the stress superposition space is the space where the advance support pressure in front of the working face and the concentrated stress of the tunnel side are superimposed on each other; A stress index determination module, used to determine the target stress index before and after pressure relief according to the stress value of each node in the target space before and after pressure relief, wherein the target space includes a plurality of discrete nodes, and the nodes are evenly distributed in the target space, and are used to characterize the stress distribution of the target space; The first pressure relief effect evaluation module is used to evaluate the pressure relief effect according to the change of the target stress index before and after the pressure relief.

8. 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 according to any one of claims 1 to 6 are implemented.

9. An electronic device, characterized in that: include: a memory having a computer program stored thereon; A processor, configured to execute the computer program in the memory to implement the steps of the method according to any one of claims 1 to 6.

10. A computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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