Method and device for comprehensively evaluating and testing dynamic instability characteristics of coal rock

Abstract

The invention provides a comprehensive evaluation test method and device for coal rock dynamic instability characteristics. The method comprises the following steps: acquiring a coal rock sample; based on the uniaxial compressive strength of the coal rock sample, uniaxial loading of the coal rock sample is controlled at different loading rates, and stress-strain relation curves of the first stage and the second stage before damage of the coal rock sample are obtained; calculating first accumulated elastic energy and first dissipated energy in the first stage and second accumulated elastic energy, second dissipated energy and post-peak loss energy in the second stage according to the stress-strain relation curve; calculating to obtain the total residual released energy of the coal rock sample; and calculating the release speed of the total residual released energy based on the total residual released energy and the equivalent dynamic failure time converted from the failure time so as to evaluate the dynamic instability characteristic of the coal rock, thereby calculating the release speed of the total residual released energy by introducing the uniaxial compressive strength, the yield deviation degree, the accumulated elastic energy and the equivalent dynamic failure time, and evaluating the dynamic instability characteristic of the coal rock. And the accuracy and precision of evaluating the dynamic instability of the coal rock are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mine safety, and in particular to a coal rock dynamic instability feature comprehensive evaluation test method and device. BACKGROUND

[0002] With the increasing consumption and mining intensity of coal resources, the high-quality coal resources in the rock pressure coal seam with considerable reserves have great mining value, but the rock mass dynamic disaster seriously threatens the safe and efficient intelligent mining of mines, and the problem of safe mining is increasingly prominent.

[0003] In related technologies, the method for evaluating the dynamic instability feature of coal rock generally takes uniaxial compressive strength, elastic energy index, impact energy index, and dynamic failure time as representatives, and obtains the dynamic failure feature of coal rock by applying a comprehensive fuzzy evaluation method to the test results of multiple samples and multiple indexes, or by considering the coal rock dynamic instability feature evaluation method of a single index such as energy, deformation, or strength. However, the above method needs to test multiple samples and multiple indexes to comprehensively evaluate the dynamic instability feature of coal rock by using a fuzzy comprehensive judgment method, and the test procedure is very complex, consumes a lot of manpower and financial resources, and the single index evaluation considers incomplete and non-specific factors, so a more reliable comprehensive evaluation test method for the dynamic instability feature of coal rock is urgently needed. SUMMARY

[0004] The present application aims to at least partially solve one of the technical problems in the related art.

[0005] To this end, the first object of the present application is to provide a comprehensive evaluation test method for the dynamic instability feature of coal rock, which introduces uniaxial compressive strength, yield deviation, accumulated elastic energy, and equivalent dynamic failure time to calculate the total residual release energy release speed, thereby improving the accuracy and precision of the evaluation of the dynamic instability of coal rock.

[0006] The second object of the present application is to provide a comprehensive evaluation test device for the dynamic instability feature of coal rock.

[0007] The third object of the present application is to provide an electronic device.

[0008] The fourth object of the present application is to provide a non-transitory computer-readable storage medium storing computer instructions.

[0009] To achieve the above objects, the first aspect of the present application provides a comprehensive evaluation test method for the dynamic instability feature of coal rock, comprising:

[0010] obtaining a coal rock sample;

[0011] based on the average uniaxial compressive strength of the coal rock sample, a stress-strain relationship curve of the coal rock sample loaded at different loading rates in the first stage and the second stage within the failure time of the coal rock sample being destroyed is established;

[0012] According to the target uniaxial compressive strength, the failure time, and the yield deviation of the coal rock sample in the stress-strain relationship curve, the first dissipated energy, the first accumulated elastic energy input in the first stage, and the second accumulated elastic energy, the second dissipated energy, and the post-peak loss energy input in the second stage are calculated;

[0013] Based on the first dissipated energy, the first accumulated elastic energy, the second dissipated energy, the second accumulated elastic energy, and the post-peak loss energy, the target uniaxial compressive strength, and the yield deviation, the total residual release energy within the failure time of the coal rock sample being destroyed is calculated;

[0014] Based on the loading rate, the failure time is converted into an equivalent dynamic failure time of the coal rock sample being destroyed;

[0015] According to the total residual release energy and the equivalent dynamic failure time, the total residual release energy release speed is calculated to evaluate the dynamic instability characteristics of the coal rock.

[0016] To achieve the above purpose, the second aspect of the present application provides a coal rock dynamic instability characteristic comprehensive evaluation test device, comprising:

[0017] The first acquisition module is used for acquiring the coal rock sample;

[0018] The construction module is used for establishing a stress-strain relationship curve of the coal rock sample loaded at different loading rates in the first stage and the second stage within the failure time of the coal rock sample being destroyed based on the average uniaxial compressive strength of the coal rock sample;

[0019] The first calculation module is used for calculating the first dissipated energy, the first accumulated elastic energy input in the first stage, and the second accumulated elastic energy, the second dissipated energy, and the post-peak loss energy input in the second stage according to the target uniaxial compressive strength, the failure time, and the yield deviation of the coal rock sample in the stress-strain relationship curve;

[0020] The second calculation module is used for calculating the total residual release energy within the failure time of the coal rock sample being destroyed based on the first dissipated energy, the first accumulated elastic energy, the second dissipated energy, the second accumulated elastic energy, and the post-peak loss energy, the target uniaxial compressive strength, and the yield deviation;

[0021] The conversion module is used for converting the failure time into an equivalent dynamic failure time of the coal rock sample being destroyed based on the loading rate;

[0022] The third calculation module is configured to calculate a total residual release energy release speed according to the total residual release energy and the equivalent dynamic failure time, so as to evaluate the dynamic instability characteristics of the coal rock.

[0023] To achieve the above object, the third aspect of the present application provides an electronic device, comprising: at least one processor; and a memory in communication connection with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the method of the first aspect.

[0024] To achieve the above object, the fourth aspect of the present application provides a non-transitory computer readable storage medium storing computer instructions, and the computer instructions are used to make the computer execute the method of the first aspect.

[0025] The coal rock dynamic instability characteristic comprehensive evaluation test method and device, electronic device and storage medium provided by the embodiments of the present application obtain a coal rock sample; based on the uniaxial compressive strength of the coal rock sample, the uniaxial loading coal rock sample is controlled at different loading rates, and the stress-strain relationship curves of the first stage and the second stage before the failure of the coal rock sample are obtained; the first accumulated elastic energy of the first stage, the first dissipated energy, the second accumulated elastic energy of the second stage, the second dissipated energy and the post-peak dissipated energy are calculated according to the stress-strain relationship curves; then the total residual release energy of the coal rock sample is calculated; and based on the total residual release energy and the equivalent dynamic failure time converted from the failure time, the total residual release energy release speed is calculated, so as to evaluate the dynamic instability characteristics of the coal rock. Therefore, by introducing the uniaxial compressive strength, the yield deviation, the accumulated elastic energy and the equivalent dynamic failure time, the total residual release energy release speed is calculated, and the accuracy and precision of the evaluation of the dynamic instability of the coal rock are improved.

[0026] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0027] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0028] Figure 1 A flowchart of a coal rock dynamic instability characteristic comprehensive evaluation test method provided by an embodiment of the present application;

[0029] Figure 2 A stress-strain curve diagram provided by an embodiment of the present application;

[0030] Figure 3A flowchart of a coal rock dynamic instability feature comprehensive evaluation test method provided by an embodiment of the present application is shown in the figure.

[0031] Figure 4 A structure diagram of a coal rock dynamic instability feature comprehensive evaluation test device provided by an embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0032] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0033] It should be noted that the acquisition, storage, use, processing, etc. of data in the technical solutions of the present application comply with relevant provisions of national laws and regulations.

[0034] The coal rock dynamic instability feature comprehensive evaluation test method and device of an embodiment of the present application are described below with reference to the accompanying drawings.

[0035] Figure 1 A flowchart of a coal rock dynamic instability feature comprehensive evaluation test method provided by an embodiment of the present application is shown in the figure.

[0036] As shown in the figure, the method comprises the following steps: Figure 1

[0037] Step 101: Obtain a coal rock sample.

[0038] In some embodiments, one implementation of obtaining a coal rock sample can be: collecting a plurality of initial coal rock samples having coal rock characteristics, wherein the height and orientation of the coal rock in the initial coal rock sample should be perpendicular to the bedding plane of the coal, and the coal rock has no obvious fissure; and performing standard sample processing on the initial coal rock sample to obtain a coal rock sample with an unevenness less than a preset size and an axial deviation less than a preset angle.

[0039] ​Specifically, according to the sampling rules for testing the mechanical properties of coal and rock, multiple representative sampling point groups were selected based on the changes in the characteristics of the coal and rock itself. This ensured that the height and orientation of the coal sample in the initial coal and rock sample were perpendicular to the bedding plane of the coal, and that the sampled coal sample should not have obvious cracks. After the initial coal and rock sample was collected, it was wrapped in multiple layers of plastic film and transported manually or by special vehicle to a designated location, placed in a sampling box, and filled with materials such as sawdust and foam. It was then transported to the laboratory for further processing. A standard core drill was used to drill a cylindrical specimen with a diameter of 50 mm from the initial coal and rock sample. The specimen was then clamped in a specimen cutter and cut into standard initial coal and rock samples with a height of 100 mm. The two ends of the standard initial coal and rock samples were then polished to ensure that the unevenness of the standard initial coal and rock samples was less than 0.05 mm and the axial deviation was less than 0.25°, thus obtaining accurate coal and rock samples.

[0040] Step 102: Based on the average uniaxial compressive strength of the coal and rock samples, establish stress-strain relationship curves for the first and second stages of loading the coal and rock samples at different loading rates within the failure time of the coal and rock samples.

[0041] Optionally, the average uniaxial compressive strength can be determined based on experimental results of historical coal and rock samples, or measured according to the physical and mechanical properties of coal and rock, or tested using methods for uniaxial compressive strength measurement and softening coefficient calculation, but is not limited thereto, and this embodiment does not specifically limit it.

[0042] In some embodiments, based on the uniaxial compressive strength of the coal and rock sample, an implementation method for establishing stress-strain relationship curves of the first and second stages of loading the coal and rock sample at different loading rates within the failure time of the coal and rock sample failure can be as follows: Based on the average uniaxial compressive strength of the coal and rock sample, the sample is loaded at a loading rate controlled by a first preset stress to a preset percentage of the average uniaxial compressive strength, and then the loading is stopped and the stress is unloaded to a second preset stress as the first stage; after the stress is unloaded to the second preset stress, the coal and rock sample is loaded at a loading rate controlled by a preset time interval strain until it is in a failed state as the second stage; and a stress-strain relationship curve is established between the target uniaxial compressive strength (strain) and stress energy (stress) of the coal and rock sample in the first and second stages within the failure time of the coal and rock sample failure.

[0043] Optionally, after the coal and rock sample meets the required dimensions and physical parameters, it is placed between the two loading plates of the press. First, it is loaded at a stress-controlled rate of 0.5 MPa / s until it reaches 75% of its uniaxial compressive strength. After loading is stopped, the stress is unloaded to 0.2 MPa, and then... -6 A coal sample was loaded at a strain-controlled rate of 1 / s until complete failure, and the stress-strain characteristics of the coal and rock samples were recorded during the process. Figure 2As shown. Furthermore, the above test can be repeated using three coal and rock samples from the same group to improve reliability.

[0044] Step 103: Based on the target uniaxial compressive strength, failure time, and yield deviation of the coal and rock sample in the stress-strain relationship curve, calculate the first dissipation energy and the first accumulated elastic energy input in the first stage, as well as the second accumulated elastic energy, the second dissipation energy, and the post-peak loss energy input in the second stage.

[0045] In some embodiments, the calculation of the first dissipated energy and the first accumulated elastic energy input in the first stage, and the second accumulated elastic energy, the second dissipated energy, and the post-peak loss energy input in the second stage, based on the target uniaxial compressive strength, failure time, and yield deviation of the coal and rock sample in the stress-strain relationship curve, can be implemented as follows: the first dissipated energy and the first accumulated elastic energy input in the first stage are calculated based on the target uniaxial compressive strength, failure time, and yield deviation of the coal and rock sample in the stress-strain relationship curve; and the second dissipated energy and the second accumulated elastic energy are calculated based on the first dissipated energy, the target uniaxial compressive strength, the yield deviation, and the first accumulated elastic energy.

[0046] Furthermore, in the stress-strain relationship curve as shown Figure 2 In the case shown, the target uniaxial compressive strength, failure time, and yield deviation of the coal sample can be determined from the stress-strain relationship curve. Then, the areas enclosed by the first-stage loading curve and the X-axis, and the areas enclosed by the unloading curve and the X-axis can be calculated, representing the first dissipation energy of the first stage, respectively. and first accumulated elastic energy Calculate the area enclosed by the pre-peak curve and the X-axis and the area enclosed by the post-peak curve and the X-axis in the second stage, which represent the pre-peak input energy U2 (second dissipation energy and second accumulated elastic energy) and the post-peak loss energy U3 in the second stage, respectively.

[0047] Where, ε B ε A ε M ε C For different stress energy values, σ C For the target uniaxial compressive strength, σ q M,C represents the yield deviation at ε M ε C The stress value at that location.

[0048] Optionally, the failure time can be the time from peak strength to loss of load-bearing capacity in the stress-strain curve.

[0049] Step 104: Based on the first dissipated energy, the first accumulated elastic energy, the second dissipated energy, the second accumulated elastic energy, the post-peak loss energy, the target uniaxial compressive strength, and the yield deviation, calculate the total remaining released energy within the failure time of the coal and rock sample being destroyed.

[0050] The yield deviation is obtained by extending the linear elastic segment of the stress-strain relationship curve to the tangent at 0.5 times the peak strength.

[0051] Optionally, in the stress-strain relationship curve such as Figure 2 In the case shown, the formula for calculating the first accumulated elastic energy can be:

[0052]

[0053] The total remaining released energy can be calculated as follows:

[0054]

[0055] Among them, U l Let d be the sum of the post-peak loss energy U3 and the second dissipation energy in the pre-peak input energy U2 of the second stage, and d be the integral.

[0056] Step 105: Based on the loading rate, convert the failure time into the equivalent dynamic failure time of the coal and rock sample.

[0057] In some embodiments, the rate of release of the total remaining energy of coal and rock is closely related to the dynamic instability characteristics of coal and rock, and the duration of failure after the peak in the coal and rock sample should be considered. Loading rate The impact of coal and rock sample failure time is characterized by the defined dynamic failure time (DT). By referring to the loading rate of dynamic failure time, this invention proposes to convert the actual failure time (t) into an equivalent dynamic failure time (DT*) for evaluation. The calculation method of the equivalent dynamic failure time is as follows:

[0058]

[0059] In the formula, E is the elastic modulus of the sample when it is 0.5 times the average uniaxial compressive strength.

[0060] Step 106: Calculate the release rate of the total remaining energy based on the total remaining energy and the equivalent dynamic failure time to evaluate the dynamic instability characteristics of coal and rock.

[0061] In some embodiments, the total remaining release energy is ΔW and the equivalent dynamic failure time is DT. * In this case, the total remaining release energy release rate is calculated as follows:

[0062]

[0063] The comprehensive evaluation and testing method for coal and rock dynamic instability characteristics according to embodiments of the present invention obtains coal and rock samples; based on the uniaxial compressive strength of the coal and rock samples, the samples are uniaxially loaded at different loading rates to obtain stress-strain relationship curves for the first and second stages before failure; the first accumulated elastic energy and the first dissipated energy of the first stage, and the second accumulated elastic energy, the second dissipated energy, and the post-peak loss energy of the second stage are calculated based on the stress-strain relationship curves; the total residual released energy of the coal and rock samples is then calculated; and the release rate of the total residual released energy is calculated based on the equivalent dynamic failure time converted from the total residual released energy and the failure time, in order to evaluate the dynamic instability characteristics of coal and rock. Thus, by introducing uniaxial compressive strength, yield deviation, accumulated elastic energy, and equivalent dynamic failure time to calculate the release rate of the total residual released energy, the accuracy and precision of evaluating coal and rock dynamic instability are improved.

[0064] To clearly illustrate the above embodiment, this embodiment also provides a comprehensive evaluation and testing method for the dynamic instability characteristics of coal and rock. Figure 3 This is a flowchart illustrating another comprehensive evaluation and testing method for coal and rock dynamic instability characteristics provided in an embodiment of the present invention.

[0065] like Figure 3 As shown, the method may include the following steps:

[0066] Step 301: Obtain coal and rock samples.

[0067] Step 302: Based on the average uniaxial compressive strength of the coal and rock samples, establish stress-strain relationship curves for the first and second stages of loading the coal and rock samples at different loading rates within the failure time of the coal and rock samples.

[0068] Step 303: Based on the target uniaxial compressive strength, failure time, and yield deviation of the coal and rock sample in the stress-strain relationship curve, calculate the first dissipation energy and the first accumulated elastic energy input in the first stage, as well as the second accumulated elastic energy, the second dissipation energy, and the post-peak loss energy input in the second stage.

[0069] Step 304: Based on the first dissipated energy, the first accumulated elastic energy, the second dissipated energy, the second accumulated elastic energy, the post-peak loss energy, the target uniaxial compressive strength, and the yield deviation, calculate the total remaining released energy within the failure time of the coal and rock sample being destroyed.

[0070] It should be noted that the specific implementation methods of steps 301 to 304 can be found in the relevant descriptions in the above embodiments.

[0071] Step 305: Obtain the residual impact energy index by the ratio of the sum of the first accumulated elastic energy and the second accumulated elastic energy to the total residual released energy.

[0072] Optionally, in the stress-strain relationship curve such as Figure 2 As shown, the total remaining release energy is ΔW and the sum of the first accumulated elastic energy and the second accumulated elastic energy is U. e In this case, the formula for calculating the residual impact energy index can be:

[0073]

[0074] Step 306: Determine the maximum degree of dynamic instability of coal and rock based on the remaining impact energy index.

[0075] Optionally, the smaller the residual impact energy index, the greater the degree of dynamic instability of coal and rock; conversely, the larger the residual impact energy index, the smaller the degree of dynamic instability of coal and rock.

[0076] The comprehensive evaluation and testing method for coal and rock dynamic instability characteristics according to embodiments of the present invention involves obtaining coal and rock samples; based on the uniaxial compressive strength of the coal and rock samples, uniaxial loading of the coal and rock samples is controlled at different loading rates to obtain stress-strain relationship curves for the first and second stages before failure of the coal and rock samples; the first accumulated elastic energy and the first dissipated energy of the first stage, and the second accumulated elastic energy, the second dissipated energy, and the post-peak loss energy of the second stage are calculated based on the stress-strain relationship curves; the total residual released energy of the coal and rock samples is then calculated; the residual impact energy index is obtained by obtaining the ratio of the sum of the first accumulated elastic energy and the second accumulated elastic energy to the total residual released energy; based on the residual impact energy index, the maximum degree of coal and rock dynamic instability is determined; and thus, the total residual impact energy index is calculated using the first accumulated elastic energy, the second accumulated elastic energy, and the total residual released energy to determine the probability and degree of danger of dynamic disasters occurring during the coal and rock instability process.

[0077] To achieve the above embodiments, the present invention also proposes a comprehensive evaluation and testing device for the dynamic instability characteristics of coal and rock.

[0078] Figure 4 This is a schematic diagram of a comprehensive evaluation and testing device for the dynamic instability characteristics of coal and rock provided in an embodiment of the present invention.

[0079] like Figure 4 As shown, the comprehensive evaluation and testing device 40 for coal and rock dynamic instability characteristics includes: a first acquisition module 41, a construction module 42, a first calculation module 43, a second calculation module 44, a conversion module 45, and a third calculation module 46.

[0080] The first acquisition module 41 is used to acquire coal and rock samples;

[0081] Module 42 is used to establish stress-strain relationship curves of the coal and rock sample under different loading rates in the first and second stages, based on the average uniaxial compressive strength of the coal and rock sample, within the failure time when the coal and rock sample is destroyed.

[0082] The first calculation module 43 is used to calculate the first dissipation energy and the first accumulated elastic energy input in the first stage, as well as the second accumulated elastic energy, the second dissipation energy and the post-peak loss energy input in the second stage, based on the target uniaxial compressive strength, failure time and yield deviation of the coal and rock sample in the stress-strain relationship curve.

[0083] The second calculation module 44 is used to calculate the total remaining released energy during the failure time when the coal and rock sample is destroyed, based on the first dissipated energy, the first accumulated elastic energy, the second dissipated energy, the second accumulated elastic energy, the post-peak loss energy, the target uniaxial compressive strength, and the yield deviation.

[0084] The conversion module 45 is used to convert the destruction time into an equivalent dynamic destruction time of the coal and rock sample based on the loading rate.

[0085] The third calculation module 46 is used to calculate the release rate of the total remaining release energy based on the total remaining release energy and the equivalent dynamic failure time, so as to evaluate the dynamic instability characteristics of coal and rock.

[0086] Furthermore, in one possible implementation of this invention, the first acquisition module 41 is specifically used for:

[0087] Multiple initial coal and rock samples with coal and rock characteristics were collected. The height orientation of the initial coal and rock samples should be perpendicular to the bedding plane of the coal, and the coal and rock should not have obvious fractures.

[0088] The initial coal and rock sample is subjected to standardized sample processing to obtain an initial coal and rock sample with unevenness smaller than a preset size and axial deviation smaller than a preset angle.

[0089] Furthermore, in one possible implementation of this invention, the construction module 42 is specifically used for:

[0090] Based on the average uniaxial compressive strength of the coal and rock sample, the stress is loaded at a loading rate controlled by a first preset stress to a preset percentage of the average uniaxial compressive strength, and then unloaded to a second preset stress after loading is stopped as the first stage.

[0091] The second stage involves loading the coal and rock sample to a damaged state at a loading rate controlled by a preset time interval after the unloading stress has been reduced to the second preset stress.

[0092] The stress-strain relationship curves between the target uniaxial compressive strength and stress energy of the coal and rock samples in the first and second stages are established within the failure time of the coal and rock samples being destroyed.

[0093] Furthermore, in one possible implementation of this invention, the first calculation module 43 is specifically used for:

[0094] Based on the target uniaxial compressive strength, failure time, and yield deviation of the coal and rock sample in the stress-strain relationship curve, the first dissipated energy and the first accumulated elastic energy of the first stage input are calculated.

[0095] Based on the first dissipated energy, the target uniaxial compressive strength, the yield deviation, and the first accumulated elastic energy, the second dissipated energy and the second accumulated elastic energy are calculated.

[0096] Furthermore, in one possible implementation of this invention, the yield deviation is obtained by extending the linear elastic segment of the stress-strain relationship curve to a tangent at 0.5 times the peak strength.

[0097] Based on the above embodiments, this invention also provides a possible implementation of a comprehensive evaluation and testing device for coal and rock dynamic instability characteristics. Building upon the previous embodiment, the device further includes:

[0098] The second acquisition module is used to acquire the remaining impact energy index obtained by the ratio of the sum of the first accumulated elastic energy and the second accumulated elastic energy to the total remaining released energy;

[0099] The determination module is used to determine the maximum degree of dynamic instability of the coal and rock based on the remaining impact energy index.

[0100] It should be noted that the foregoing explanation of the method embodiments also applies to the apparatus of this embodiment, and will not be repeated here.

[0101] The coal and rock dynamic instability characteristic comprehensive evaluation and testing device of this invention acquires coal and rock samples; based on the uniaxial compressive strength of the coal and rock samples, the coal and rock samples are uniaxially loaded at different loading rates to obtain the stress-strain relationship curves of the first stage and the second stage before failure of the coal and rock samples; based on the stress-strain relationship curves, the first accumulated elastic energy and the first dissipated energy of the first stage, and the second accumulated elastic energy, the second dissipated energy and the post-peak loss energy of the second stage are calculated; then the total residual release energy of the coal and rock samples is calculated; and based on the total residual release energy and the equivalent dynamic failure time converted from the failure time, the release rate of the total residual release energy is calculated to evaluate the coal and rock dynamic instability characteristics. Thus, by introducing uniaxial compressive strength, yield deviation, accumulated elastic energy and equivalent dynamic failure time to calculate the release rate of the total residual release energy, the accuracy and precision of evaluating coal and rock dynamic instability are improved.

[0102] To achieve the above embodiments, the present invention also proposes an electronic device, comprising:

[0103] At least one processor; and

[0104] A memory communicatively connected to the at least one processor; wherein,

[0105] The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the aforementioned method.

[0106] To implement the above embodiments, the present invention also proposes a non-transitory computer-readable storage medium storing computer instructions for causing the computer to perform the aforementioned method.

[0107] To implement the above embodiments, the present invention also proposes a computer program product, including a computer program that, when executed by a processor, implements the method described above.

[0108] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0109] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0110] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of the invention pertain.

[0111] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0112] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any of the following techniques known in the art, or a combination thereof: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0113] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0114] Furthermore, the functional units in the various embodiments of the present invention can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0115] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A comprehensive evaluation and testing method for the dynamic instability characteristics of coal and rock, characterized in that, The method includes: Obtain coal and rock samples; Based on the mechanical strength parameters of the coal and rock samples, stress-strain relationship curves were established when the coal and rock samples were loaded using a multi-stage loading control method during the process of coal and rock sample failure. Based on the stress-strain relationship curve, the total remaining released energy at the time of failure of the coal and rock sample is calculated. Based on the loading rate, the destruction time is converted into an equivalent destruction time; The release rate of the total remaining energy is calculated based on the total remaining energy and the equivalent dynamic failure time to evaluate the dynamic instability characteristics of coal and rock.

2. The method according to claim 1, characterized in that, The acquisition of coal and rock samples includes: Multiple initial coal and rock samples with coal and rock characteristics were collected. The height orientation of the initial coal and rock samples should be perpendicular to the bedding plane of the coal, and the coal and rock should not have obvious fractures. The initial coal and rock sample is subjected to standardized sample processing to obtain an initial coal and rock sample with unevenness smaller than a preset size and axial deviation smaller than a preset angle.

3. The method according to claim 1, characterized in that, The mechanical strength parameters based on the coal and rock sample are established as stress-strain relationship curves during the failure process of the coal and rock sample, using a multi-stage loading control method, including: Based on the average uniaxial compressive strength of the coal and rock sample, the stress is loaded at a loading rate controlled by a first preset stress to a preset percentage of the average uniaxial compressive strength, and then unloaded to a second preset stress after loading is stopped as the first stage. The second stage involves loading the coal and rock sample to a damaged state at a loading rate controlled by a preset time interval after the unloading stress has been reduced to the second preset stress. The stress-strain relationship curves between the target uniaxial compressive strength and stress energy of the coal and rock samples in the first and second stages are established within the failure time of the coal and rock samples being destroyed.

4. The method according to claim 1, characterized in that, Based on the stress-strain relationship curve, the total residual energy released when the coal and rock sample fails is calculated, including: Based on the target uniaxial compressive strength, failure time, and yield deviation of the coal and rock sample in the stress-strain relationship curve, the first dissipated energy and the first accumulated elastic energy of the first stage input are calculated. Based on the first dissipated energy, the target uniaxial compressive strength, the yield deviation, and the first accumulated elastic energy, the second dissipated energy and the second accumulated elastic energy are calculated. Based on the first dissipated energy, the first accumulated elastic energy, the second dissipated energy, the second accumulated elastic energy, the post-peak loss energy, the target uniaxial compressive strength, and the yield deviation, the total remaining released energy within the failure time of the coal and rock sample is calculated.

5. The method according to claim 4, characterized in that, The yield deviation is obtained by extending the linear elastic segment of the stress-strain relationship curve to a tangent at 0.5 times the peak strength.

6. The method according to claim 1, characterized in that, The method further includes: The residual impact energy index is obtained by comparing the sum of the first and second accumulated elastic energies with the total remaining released energy. The maximum degree of dynamic instability of the coal and rock is determined based on the remaining impact energy index.

7. A comprehensive evaluation and testing device for the dynamic instability characteristics of coal and rock, characterized in that, The device includes: The first acquisition module is used to acquire coal and rock samples; The module is used to establish a stress-strain relationship curve of the coal and rock sample during the destruction process by loading the coal and rock sample through a multi-stage loading control method, based on the mechanical strength parameters of the coal and rock sample. The first calculation module is used to calculate the total remaining energy released when the coal and rock sample fails, based on the stress-strain relationship curve. A conversion module is used to convert the destruction time into an equivalent destruction time based on the loading rate; The third calculation module is used to calculate the release rate of the total remaining energy based on the total remaining energy and the equivalent dynamic failure time, so as to evaluate the dynamic instability characteristics of coal and rock.

8. The apparatus according to claim 7, characterized in that, The device further includes: The second acquisition module is used to acquire the residual impact energy index obtained by the ratio of the first accumulated elastic energy to the total remaining released energy; The determination module is used to determine the maximum degree of dynamic instability of the coal and rock based on the remaining impact energy index.

9. An electronic device, characterized in that, include: At least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-6.

10. A non-transitory computer-readable storage medium storing computer instructions, characterized in that, The computer instructions are used to cause the computer to perform the method according to any one of claims 1-6.

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