Coal body impact tendency evaluation method, device and electronic equipment
By obtaining the impact energy index and elastic energy index of the coal body, calculating the energy release and transfer ratio parameters, and using the energy transfer index to evaluate the impact tendency of the coal body, the problem of low evaluation accuracy in the existing technology is solved, and higher accuracy and reliability are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CCTEG CHINA COAL RES INST
- Filing Date
- 2023-01-17
- Publication Date
- 2026-06-02
AI Technical Summary
The accuracy of coal impact tendency assessment results in existing technologies is low, which affects the safety of coal mine production.
By obtaining the impact energy index and elastic energy index of the coal body, the energy release ratio parameter and energy transfer ratio parameter are calculated, and the impact tendency of the coal body is evaluated using the energy transfer index, taking into account more physical and mechanical parameters of the coal body.
This improves the accuracy and reliability of rockburst tendency assessment, ensures the precision of assessment results, and provides a reliable reference for preventing rockbursts in coal mines.
Smart Images
Figure CN116124616B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of mine safety technology, and in particular to a method, apparatus and electronic equipment for evaluating the impact tendency of coal seams. Background Technology
[0002] As coal mining in my country gradually shifts to deeper levels, rockburst has become one of the major hazards threatening coal mine production safety. Obtaining the rockburst tendency attributes of coal bodies, improving the evaluation system for rockburst tendency, and accurately obtaining the evaluation results of coal body rockburst tendency are beneficial for mines to carry out prevention and control work. In related technologies, the accuracy of the evaluation results of coal body rockburst tendency is relatively low when attempting to evaluate it. Therefore, how to reasonably and accurately evaluate the rockburst tendency of coal bodies has become an urgent problem to be solved. Summary of the Invention
[0003] This application provides a method, apparatus, and electronic device for evaluating the impact tendency of coal. Based on the energy transfer index of the coal, this application obtains the evaluation results of the impact tendency of the coal. In obtaining the evaluation results of the impact tendency, more physical and mechanical parameters of the coal are considered, which improves the accuracy and reliability of the evaluation results of the impact tendency and ensures the precision of the evaluation results of the impact tendency.
[0004] According to a first aspect of this application, a method for evaluating the impact tendency of coal is provided, comprising: obtaining an impact energy index and an elastic energy index of the coal; obtaining an energy release ratio parameter of the coal based on the impact energy index and the elastic energy index; obtaining an energy transfer ratio parameter of the coal; obtaining an energy transfer index of the coal based on the energy release ratio parameter and the energy transfer ratio parameter; and obtaining an evaluation result of the impact tendency of the coal based on the energy transfer index.
[0005] In addition, the coal impact tendency evaluation method according to the above embodiments of this application may also have the following additional technical features:
[0006] According to one embodiment of this application, obtaining the energy release ratio parameter of the coal body based on the impact energy index and the elastic energy index further includes: obtaining the product between the impact energy index and the elastic energy index; and obtaining the energy release ratio parameter based on the product and the elastic energy index.
[0007] According to one embodiment of this application, obtaining the energy transfer ratio parameter of the coal body further includes: obtaining a first transfer energy of the coal body in the main direction, a second transfer energy of the coal body perpendicular to the main direction, and a third transfer energy of the coal body parallel to the main direction, wherein the main direction is the direction of the coal body toward the roadway; and obtaining the energy transfer ratio parameter based on the first transfer energy, the second transfer energy, and the third transfer energy.
[0008] According to one embodiment of this application, the method further includes: obtaining a first stress coefficient of the coal body in the main direction, a second stress coefficient of the coal body in the direction perpendicular to the main direction, and a third stress coefficient of the coal body in the direction parallel to the main direction; and obtaining the energy transfer ratio parameter based on the first stress coefficient, the second stress coefficient, and the third stress coefficient.
[0009] According to one embodiment of this application, the method further includes: obtaining the burial depth of the coal body; obtaining the range of the energy release ratio parameter based on the burial depth; and selecting the minimum value of the energy release ratio parameter from the range of the energy release ratio parameter as the energy transfer ratio parameter.
[0010] According to one embodiment of this application, obtaining the energy transfer index of the coal body based on the energy release ratio parameter and the energy transfer ratio parameter further includes: obtaining the product between the energy release ratio parameter and the energy transfer ratio parameter, and using the product as the energy transfer index.
[0011] According to one embodiment of this application, the step of obtaining the evaluation result of the impact tendency of the coal body based on the energy transfer index further includes: obtaining a first preset threshold and a second preset threshold of the energy transfer index; and obtaining the evaluation result of the impact tendency based on the energy transfer index, the first preset threshold, and the second preset threshold.
[0012] According to a second aspect of this application, a device for evaluating the impact tendency of coal is provided, comprising: a first acquisition module for acquiring an impact energy index and an elastic energy index of the coal; a second acquisition module for acquiring an energy release ratio parameter of the coal based on the impact energy index and the elastic energy index; a third acquisition module for acquiring an energy transfer ratio parameter of the coal; a fourth acquisition module for acquiring an energy transfer index of the coal based on the energy release ratio parameter and the energy transfer ratio parameter; and a fifth acquisition module for acquiring an evaluation result of the impact tendency of the coal based on the energy transfer index.
[0013] In addition, the coal impact tendency evaluation device according to the above embodiments of this application may also have the following additional technical features:
[0014] According to one embodiment of this application, the second acquisition module is further configured to: acquire the product between the impact energy index and the elastic energy index; and acquire the energy release ratio parameter based on the product and the elastic energy index.
[0015] According to one embodiment of this application, the third acquisition module is further configured to: acquire a first transfer energy of the coal body in the main direction, a second transfer energy of the coal body perpendicular to the main direction, and a third transfer energy of the coal body parallel to the main direction, wherein the main direction is the direction of the coal body toward the roadway; and acquire the energy transfer ratio parameter based on the first transfer energy, the second transfer energy, and the third transfer energy.
[0016] According to one embodiment of this application, the apparatus is further configured to: obtain a first stress coefficient of the coal body in the main direction, a second stress coefficient of the coal body in the direction perpendicular to the main direction, and a third stress coefficient of the coal body in the direction parallel to the main direction; and obtain the energy transfer ratio parameter based on the first stress coefficient, the second stress coefficient, and the third stress coefficient.
[0017] According to one embodiment of this application, the apparatus is further configured to: obtain the burial depth of the coal body; obtain the range of the energy release ratio parameter based on the burial depth; and select the minimum value of the energy release ratio parameter from the range of the energy release ratio parameter as the energy transfer ratio parameter.
[0018] According to one embodiment of this application, the fourth acquisition module is further configured to: acquire the product between the energy release ratio parameter and the energy transfer ratio parameter, and use the product as the energy transfer index.
[0019] According to one embodiment of this application, the fifth acquisition module is further configured to: acquire a first preset threshold and a second preset threshold of the energy transfer index; and acquire the evaluation result of the impact tendency based on the energy transfer index, the first preset threshold, and the second preset threshold.
[0020] To achieve the above objectives, a third aspect of this application provides an electronic device including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the aforementioned method for evaluating the coal impact tendency.
[0021] To achieve the above objectives, a fourth aspect of this application provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the aforementioned method for evaluating the coal impact tendency.
[0022] To achieve the above objectives, a fifth aspect of this application provides a computer program product, including a computer program that, when executed by a processor, implements the coal impact tendency evaluation method as described above.
[0023] The technical solutions provided in this application have at least the following beneficial effects:
[0024] This application provides a method for evaluating the impact tendency of coal. It involves obtaining the impact energy index and elastic energy index of the coal, then obtaining energy release ratio parameters and energy transfer ratio parameters based on these indices, and finally obtaining the energy transfer index based on these parameters. The evaluation result of the coal's impact tendency is then obtained based on the energy transfer index. This application, by obtaining the evaluation result of the coal's impact tendency based on the energy transfer index, considers more physical and mechanical parameters of the coal, improving the accuracy and reliability of the evaluation result and ensuring its precision.
[0025] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application will become readily apparent from the following description. Attached Figure Description
[0026] The accompanying drawings are provided for a better understanding of this solution and do not constitute a limitation of this application. Wherein:
[0027] Figure 1 A flowchart illustrating a method for evaluating the impact tendency of coal seams, provided in an embodiment of this application;
[0028] Figure 2 A schematic diagram of the stress-strain curve of the coal body provided in the embodiments of this application;
[0029] Figure 3 A flowchart illustrating another method for evaluating coal impact tendency provided in this application embodiment;
[0030] Figure 4 A schematic diagram illustrating the relationship between the impact energy index and elastic energy index and the energy release ratio parameter provided in the embodiments of this application;
[0031] Figure 5(a) is a schematic diagram showing the relationship between an energy release ratio parameter and an impact energy index provided in an embodiment of this application;
[0032] Figure 5(b) is a schematic diagram showing the relationship between another energy release ratio parameter and the impact energy index provided in the embodiments of this application;
[0033] Figure 5(c) is a schematic diagram showing the relationship between another energy release ratio parameter and the impact energy index provided in the embodiment of this application;
[0034] Figure 6 This is a schematic diagram of energy transfer in coal provided in an embodiment of this application;
[0035] Figure 7 A flowchart illustrating another method for evaluating coal impact tendency provided in this application embodiment;
[0036] Figure 8 A flowchart illustrating another method for evaluating coal impact tendency provided in this application embodiment;
[0037] Figure 9 A schematic diagram illustrating the stress changes in the coal body during the energy transfer process, provided as an embodiment of this application;
[0038] Figure 10 A flowchart illustrating another method for evaluating coal impact tendency provided in this application embodiment;
[0039] Figure 11 A flowchart illustrating another method for evaluating coal impact tendency provided in this application embodiment;
[0040] Figure 12 This is a schematic diagram of the structure of a coal impact tendency evaluation device provided in an embodiment of this application;
[0041] Figure 13 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation
[0042] The following description, in conjunction with the accompanying drawings, illustrates exemplary embodiments of this application, including various details to aid understanding. These should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this application. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.
[0043] The following examples illustrate the coal impact tendency evaluation method, apparatus, and electronic equipment of this application.
[0044] Figure 1 This is a flowchart illustrating a method for evaluating the coal impact tendency provided in an embodiment of this application. It should be noted that the executing entity of this method is a coal impact tendency evaluation device, which can be a hardware device or software within a hardware device. The hardware device may include, for example, a terminal device or a server.
[0045] like Figure 1 As shown, the coal seam impact tendency evaluation method proposed in this embodiment includes the following steps:
[0046] S101. Obtain the impact energy index and elastic energy index of the coal body.
[0047] Among them, the impact energy index K of the coal body E , refers to the ratio of the deformation energy accumulated before the peak value to the deformation energy lost after the peak value in the stress-strain curve of a coal specimen under uniaxial compression.
[0048] Among them, the elastic energy index W of the coal body ET It refers to the ratio of the elastic deformation energy stored in a unit volume of coal before it is broken to the energy consumed during the stress process.
[0049] It should be noted that this application does not limit the specific methods for obtaining the impact energy index and elastic energy index of the coal body, and the appropriate methods can be selected according to the actual situation.
[0050] Optionally, such as Figure 2 As shown, the impact energy index and elastic energy index of the coal body can be obtained from the stress-strain curve.
[0051] For example, the stress-strain curve can be divided into sections, where the uniaxial compressive strength Rc is 12.306 MPa and the peak strain is ε. p 0.01027, U S The deformation energy accumulated before the peak, U X The deformation energy lost after peak value, φ SE For elastic strain energy, φ SP The plastic strain energy is used to obtain the impact energy index K of the coal body according to the following formula. E And the elastic energy index W of coal body ET .
[0052]
[0053] Among them, K E The impact energy index of coal body, W ET The elastic energy index of coal, U SThe deformation energy accumulated before the peak, U X The deformation energy lost after peak value, φ SE For elastic strain energy, φ SP It is the plastic strain energy.
[0054] Optionally, the main coal seams of three coal mines can be arbitrarily selected, for example: the main coal seams of coal mines M, Y, and Z can be selected, and the sampling test results of the main coal seams of the three coal mines can be obtained. Then, the impact energy index K of the coal body can be obtained according to the above formula. E .
[0055] S102. Obtain the energy release ratio parameters of the coal body based on the impact energy index and elastic energy index.
[0056] Among them, the energy release ratio parameter of the coal body The energy release ratio (Energy Release Ratio) refers to the ratio of the impact energy released when the coal body is damaged to the elastic deformation energy obtained during the loading process of the coal body. It is the ratio of the energy released when the coal body is damaged to the energy accumulated.
[0057] It should be noted that the impact energy released by the coal body during the process of compression failure is equal to the difference between the elastic deformation energy obtained before failure and the dissipated deformation energy after failure. Among them, the elastic deformation energy is equal to the integral area of the stress-strain curve before the peak minus the dissipated energy in the calculation of the elastic energy index.
[0058] In this embodiment of the application, after obtaining the impact energy index and the elastic energy index, the energy release ratio parameter of the coal body can be obtained based on the impact energy index and the elastic energy index.
[0059] S103. Obtain the energy transfer ratio parameters of the coal body.
[0060] It should be noted that the proportion of energy propagating along the path can be characterized by the energy transfer ratio parameter β.
[0061] Optionally, the first energy transfer of the coal body in the main direction, the second energy transfer of the coal body in the direction perpendicular to the main direction, and the third energy transfer of the coal body in the direction parallel to the main direction can be obtained, wherein the main direction is the direction of the coal body toward the roadway, and the energy transfer ratio parameter is obtained based on the first energy transfer, the second energy transfer, and the third energy transfer.
[0062] S104. Obtain the energy transfer index of the coal body based on the energy release ratio parameter and the energy transfer ratio parameter.
[0063] Among them, the impact tendency of coal refers to the property of coal to accumulate deformation energy and produce impact damage.
[0064] It should be noted that after obtaining the energy release ratio parameter and the energy transfer ratio parameter, the product between the energy release ratio parameter and the energy transfer ratio parameter can be obtained, and the product between the energy release ratio parameter and the energy transfer ratio parameter can be used as the energy transfer index.
[0065] S105. Based on the energy transfer index, obtain the evaluation results of the coal body's impact tendency.
[0066] Optionally, after obtaining the energy transfer index, a first preset threshold and a second preset threshold of the energy transfer index can be obtained, and the evaluation result of the impact tendency can be obtained based on the energy transfer index, the first preset threshold and the second preset threshold.
[0067] The method for evaluating the impact tendency of coal provided in this application obtains the impact energy index and elastic energy index of the coal. Based on these indices, it obtains the energy release ratio parameter and energy transfer ratio parameter, and then the energy transfer index. Finally, it obtains the evaluation result of the coal's impact tendency. This application, by using the energy transfer index to obtain the evaluation result of the coal's impact tendency, considers more physical and mechanical parameters of the coal, improving the accuracy and reliability of the evaluation result and ensuring its precision.
[0068] As one possible way to achieve this, such as Figure 3 As shown, based on the above embodiments, the specific process of obtaining the energy release ratio parameter of the coal body according to the impact energy index and elastic energy index in step S102 includes the following steps:
[0069] S301, Obtain the product between the impact energy index and the elastic energy index.
[0070] In this embodiment of the application, after obtaining the impact energy index and the elastic energy index, the product W between the impact energy index and the elastic energy index can be obtained. ET K E .
[0071] S302. Obtain the energy release ratio parameter based on the product and elastic energy index.
[0072] Optionally, after obtaining the product and elastic energy index, the energy release ratio parameter can be obtained according to the following formula.
[0073]
[0074] in, The energy release ratio parameter of the coal body, K E The impact energy index of coal body, W ET The elastic energy index of coal, U X The deformation energy lost after peak value, φ SE It is the elastic strain energy.
[0075] It should be noted that after obtaining the energy release ratio parameter, such as Figure 4 As shown, the sensitivity between the impact energy index and the elastic energy index and the energy release ratio parameter can be analyzed. Figure 4 It can be seen that both the impact energy index and the elastic energy index are positively correlated with the energy release ratio parameter, with the impact energy index showing a higher sensitivity to the energy release ratio parameter.
[0076] It should be noted that the energy transfer process in the coal seam can be regarded as a chain reaction of energy transfer to the roadway or working face. The ability of each area of the coal seam to transfer energy to the adjacent area determines the rockburst risk. One of the conditions for rockburst to occur is the continuous transfer of energy in the coal seam.
[0077] It should be noted that when the energy release ratio parameter When the energy release ratio parameter is specified, it indicates that the coal body does not release impact energy to the outside. Coal bodies meeting this condition are difficult to continuously transfer energy and can be considered to have no impact tendency. When the energy release ratio parameter is high, it indicates that in addition to the energy dissipated by deformation, a certain proportion of the energy is released to adjacent coal seams, suggesting that the coal seams may have an impact tendency; At this point, it is the critical point at which a rockburst may or may not occur.
[0078] Optionally, when the energy release ratio parameter When, the following formula can be obtained from equation (2).
[0079]
[0080] Optionally, the critical point values of the impact energy index and the elastic energy index can be obtained, for example:
[0081] (K E W ET = {(1.2, 5), (1.5, 2), (5, 0.25)}.
[0082] It should be noted that after obtaining the energy release ratio parameter... Then, as shown in Figure 5(a), the energy release ratio parameters can be obtained for coal mines M, Y, and Z. Impact Energy Index KE The relationship between them, where the goodness of fit R 2 The value is 0.999; as shown in Figure 5(b), the evaluation results of the impact tendency of other coal bodies can be obtained in advance, and the energy release ratio parameter can be obtained based on the pre-obtained evaluation results of the impact tendency of the coal bodies. Impact Energy Index K E The relationship between them, where the goodness of fit R 2 The value is 0.927; Figures 5(a) and 5(b) are combined, as shown in Figure 5(c), to obtain the final energy release ratio parameter. Impact Energy Index K E The relationship between them
[0083] Among them, the goodness of fit R 2 It is 0.955.
[0084] It should be noted that, as Figure 6 As shown, the coal seam can be pre-divided into several regions. The energy transfer of the coal body in each region can be simplified into three cases: large-scale destructive transfer, coexistence of destructive and elastic propagation, and elastic propagation only. In the case of large-scale destructive transfer, the energy is much greater than the instability limit of the coal body. Under this condition, a large-scale rockburst will occur, and obtaining the energy transfer ratio parameter becomes meaningless. In the case of elastic propagation only, the energy is stored in the coal body in the form of elastic energy during the transfer process. The energy is gradually dissipated, and the final result is an increase in the overall energy storage of the coal seam, without triggering a rockburst. When elastic and destructive transfer coexist, the coal body first absorbs the impact energy and converts it into its own elastic energy and transfers the elastic energy to the next region. After reaching the limit, it becomes unstable and releases the impact energy to the next region, ultimately forming a chain reaction of continuous instability of the coal body in each region.
[0085] Optionally, after energy is transferred to the coal seam, the energy originates from region X1 and ends at the roadway. The size and form of the energy ultimately transferred to the roadway determine whether the energy source can trigger a rockburst. The proportion of energy released per unit volume of upstream coal body and transferred to downstream coal body in the energy flow field can be defined as the energy transfer ratio parameter β. The X1 region of the coal seam is set as follows: n The initial accumulated energy is U n The energy released downstream after instability and failure is a. n The upstream path releases energy U0, which begins to transfer to the coal body in region X1. This can be determined based on the energy release ratio parameter. The inter-regional energy transfer value a can be obtained from the energy transfer ratio parameter β. n :
[0086]
[0087] Optionally, for situations where the initial energy storage dispersion of the coal body is low in different regions of the coal seam, U can be... 1～n Simplify to U, disregarding the case where the energy release ratio is negative, let The energy transfer value 'a' between regions can be obtained. n :
[0088]
[0089]
[0090] It should be noted that when At that time, the transmission efficiency at infinity is a n / U=1, when At infinity, the energy transfer efficiency is less than 1; when When the energy transfer efficiency is greater than 1 at non-infinity, the total energy amount gradually increases during the energy transfer process. For coal seams that are not in a critical state of instability, it is difficult to form a chain reaction when the energy transfer efficiency is less than 1. When the energy transfer efficiency is greater than 1, a chain reaction of continuous destruction may be formed, which may trigger a rockburst at the end of the roadway as the transfer path.
[0091] The process of obtaining the energy transfer ratio parameters of the coal body is explained below.
[0092] As one possible way to achieve this, such as Figure 7 As shown, based on the above embodiment, the specific process of obtaining the energy transfer ratio parameter of the coal body in step S102 includes the following steps:
[0093] S701. Obtain the first energy transfer of the coal body in the main direction, the second energy transfer of the coal body in the direction perpendicular to the main direction, and the third energy transfer of the coal body in the direction parallel to the main direction, wherein the main direction is the direction of the coal body toward the roadway.
[0094] It should be noted that the direction of energy release is opposite to the direction of energy storage, but the magnitude is positively correlated, using the energy release ratio parameter. The proportion of energy dissipation is characterized by the energy transfer ratio parameter β, which represents the proportion of energy propagating along the path.
[0095] Optionally, the main direction can be defined as the direction from the coal body to the roadway, and the first transferred energy U of the coal body in the main direction can be obtained. m The second energy transfer U of the coal body in the vertical and main directions v1 And the third energy transfer U of the coal body in the parallel and main directions v2 .
[0096] S702. Obtain the energy transfer ratio parameter based on the first transferred energy, the second transferred energy, and the third transferred energy.
[0097] It should be noted that after obtaining the first transferred energy U m Second energy transfer U v1 and the third energy transfer U v2 Then, the energy transfer ratio parameter β can be obtained using the following formula:
[0098]
[0099] Where β is the energy transfer ratio parameter, U m For the first transfer of energy, U v1 For the second energy transfer, U v2 After the third energy transfer.
[0100] Optionally, three parameters can be obtained: the cross-sectional area A(t), the length L(t), and the stress σ(t) of the coal body. Here, A(t) is a function of the cross-sectional area of the coal body changing with time, the length L(t) is a function of the length of the coal body changing with time, and the stress σ(t) is a function of the cross-sectional area of the coal body changing with time. The product of the three parameters is expressed as the function g(t) = A(t)L(t)σ(t).
[0101] Alternatively, the first transfer energy U can be obtained using the following formula. m :
[0102]
[0103] Among them, U m For the first transfer of energy, ε m The transverse strain of the coal body.
[0104] Optionally, for the longitudinal strain ε of the coal body v The longitudinal strain is the product of the transverse strain and the Poisson's ratio ν, i.e., νε m =ε v The second transferred energy U can be obtained using the following formula. v1 With the third energy transfer U v2 The sum of U v :
[0105]
[0106] Among them, U v Second energy transfer U v1 With the third energy transfer U v2 The sum of ε v The longitudinal strain of the coal body, ν is Poisson's ratio, ε m The transverse strain of the coal body.
[0107] Furthermore, equations (5) and (6) can be substituted into equation (4) to obtain the energy transfer ratio parameter β:
[0108]
[0109] It should be noted that the first stress coefficient of the coal body in the main direction, the second stress coefficient of the coal body in the direction perpendicular to the main direction, and the third stress coefficient of the coal body in the direction parallel to the main direction can also be obtained. Based on the first stress coefficient, the second stress coefficient, and the third stress coefficient, the energy transfer ratio parameter can be obtained.
[0110] As one possible way to achieve this, such as Figure 8 As shown, based on the above embodiment, the specific process of obtaining the energy transfer ratio parameter of the coal body in step S102 includes the following steps:
[0111] S801, Obtain the first stress coefficient of the coal body in the main direction, the second stress coefficient of the coal body in the direction perpendicular to the main direction, and the third stress coefficient of the coal body in the direction parallel to the main direction.
[0112] Optionally, such as Figure 9 As shown, the stress state of the coal body before and after energy transfer can be constructed. In the initial state, the stress in the main direction, the stress perpendicular to the main direction, and the stress parallel to the main direction of the coal body are relatively small. After energy transfer, they increase by a relatively fixed proportional coefficient. The stress coefficient k of the coal body in the main direction can be defined. m The stress coefficients of the coal body in the directions perpendicular to and parallel to the principal direction are k1 and k2, respectively. These can be obtained by simplifying the boundary conditions of the coal body.
[0113]
[0114] A m (t)=A v1 (t)=A v2 (t), L m (t)=L v1 (t)=L v2 (t) (9)
[0115] Where, k m k1 is the stress coefficient of the coal body in the main direction, k2 is the stress coefficient of the coal body in the direction perpendicular to the main direction, and k2 is the stress coefficient of the coal body in the direction parallel to the main direction.
[0116] S802. Obtain the energy transfer ratio parameter based on the first stress coefficient, the second stress coefficient, and the third stress coefficient.
[0117] Optionally, after obtaining the first stress coefficient, the second stress coefficient, and the third stress coefficient, when the stress ratio remains almost constant during the energy transfer process, equations (8) and (9) can be converted to equation (7) to obtain the energy transfer ratio parameter β:
[0118]
[0119] Furthermore, after obtaining the energy transfer ratio parameter β, the range of the energy release ratio parameter can be obtained based on the burial depth of the coal body, and the minimum value of the energy release ratio parameter can be selected from the range of the energy release ratio parameter as the energy transfer ratio parameter.
[0120] As one possible way to achieve this, such as Figure 10 As shown, based on the above embodiments, the specific process for obtaining the energy transfer ratio parameter of the coal body includes the following steps:
[0121] S1001. Obtain the burial depth of the coal seam.
[0122] The burial depth of the coal seam refers to the distance between the surface and the top and bottom plates of the coal seam.
[0123] S1002. Based on the burial depth, obtain the range of energy release ratio parameters.
[0124] It should be noted that, for the uniaxial case, the stress coefficient k1 of the coal body in the direction perpendicular to the principal direction and the stress coefficient k2 of the coal body in the direction parallel to the principal direction are both zero, i.e., k1 = k2 = 0, and the energy release ratio parameter is 1, i.e., β = 1. For the triaxial case, the stress coefficient k2 of the coal body in the principal direction can be obtained by analyzing the triaxial compression test data. m The quotient of the stress coefficient k1 of the coal body in the direction perpendicular to the main direction is less than or equal to 6, i.e., k m / k1≤6; For deep hydrostatic pressure environments, k m ≥k1=k2; For shallow hydrostatic pressure environments, the ratio ranges from k2 / k1=1~2. Among them, deep hydrostatic pressure environments can be for coal bodies buried at a depth of 1000 meters to 1400 meters, and shallow hydrostatic pressure environments can be for coal bodies buried at a depth of 400 meters to 1000 meters.
[0125] Optionally, the range of energy release ratio parameters can be obtained based on the burial depth of the coal body:
[0126] Deep hydrostatic pressure environment
[0127] Shallow hydrostatic pressure environment
[0128] Where ν is Poisson's ratio.
[0129] S1003. Select the minimum value of the energy release ratio parameter from the range of energy release ratio parameters as the energy transfer ratio parameter.
[0130] Optionally, since the coal seam burial depth in the embodiments of this application is less than 800m, which belongs to a shallow hydrostatic pressure environment, the energy release ratio parameter β can be obtained:
[0131]
[0132] As one possible way to achieve this, such as Figure 11 As shown, based on the above embodiments, the specific process of obtaining the evaluation result of the coal body's impact tendency according to the energy transfer index in step S105 includes the following steps:
[0133] S1101. Obtain the first preset threshold and the second preset threshold of the energy transfer index.
[0134] It should be noted that this disclosure does not limit the setting of the first and second preset thresholds for the energy transfer index, and they can be set according to the actual situation.
[0135] Optionally, a first preset threshold for the energy transfer index can be set to 0, and a second preset threshold for the energy transfer index can be set to 0.5.
[0136] S1102. Based on the energy transfer index, the first preset threshold, and the second preset threshold, obtain the evaluation result of the impact tendency.
[0137] Optionally, after obtaining the first preset threshold and the second preset threshold, the evaluation result of the impact tendency can be obtained based on the energy transfer index, the first preset threshold and the second preset threshold.
[0138] For example, as shown in Table 1, when the energy transfer index... When the impact tendency assessment result is zero, that is, the coal body does not have an impact tendency, and when the energy transfer index is at... Within the range, the assessment result for impact tendency is weak, and when the energy transfer index is... At that time, the assessment result for the impact tendency was strong.
[0139] Table 1
[0140]
[0141] In summary, the coal impact tendency evaluation method provided in this application obtains the evaluation results based on the energy transfer index of the coal. In obtaining the evaluation results, more physical and mechanical parameters of the coal are considered, improving the accuracy and reliability of the evaluation results and ensuring their precision. Based on the evaluation results, a reliable reference can be provided for subsequent coal impact tendency identification.
[0142] To achieve the above embodiments, this embodiment provides a device for evaluating the impact tendency of coal seams. Figure 12 This is a schematic diagram of the structure of a coal impact tendency evaluation device provided in an embodiment of this application.
[0143] like Figure 12 As shown, the coal seam impact tendency evaluation device 1000 includes: a first acquisition module 110, a second acquisition module 120, a third acquisition module 130, a fourth acquisition module 140, and a fifth acquisition module 150. Among them,
[0144] The first acquisition module 110 is used to acquire the impact energy index of the coal body and the elastic energy index of the coal body;
[0145] The second acquisition module 120 is used to acquire the energy release ratio parameter of the coal body based on the impact energy index and the elastic energy index.
[0146] The third acquisition module 130 is used to acquire the energy transfer ratio parameter of the coal body;
[0147] The fourth acquisition module 140 is used to acquire the energy transfer index of the coal body based on the energy release ratio parameter and the energy transfer ratio parameter.
[0148] The fifth acquisition module 150 is used to acquire the evaluation result of the impact tendency of the coal body based on the energy transfer index.
[0149] According to one embodiment of this application, the second acquisition module 120 is further configured to: acquire the product between the impact energy index and the elastic energy index; and acquire the energy release ratio parameter based on the product and the elastic energy index.
[0150] According to one embodiment of this application, the third acquisition module 130 is further configured to: acquire a first transfer energy of the coal body in the main direction, a second transfer energy of the coal body perpendicular to the main direction, and a third transfer energy of the coal body parallel to the main direction, wherein the main direction is the direction of the coal body toward the roadway; and acquire the energy transfer ratio parameter based on the first transfer energy, the second transfer energy, and the third transfer energy.
[0151] According to one embodiment of this application, the apparatus 1000 is further configured to: obtain a first stress coefficient of the coal body in the main direction, a second stress coefficient of the coal body in the direction perpendicular to the main direction, and a third stress coefficient of the coal body in the direction parallel to the main direction; and obtain the energy transfer ratio parameter based on the first stress coefficient, the second stress coefficient, and the third stress coefficient.
[0152] According to one embodiment of this application, the apparatus 1000 is further configured to: obtain the burial depth of the coal body; obtain the range of the energy release ratio parameter based on the burial depth; and select the minimum value of the energy release ratio parameter from the range of the energy release ratio parameter as the energy transfer ratio parameter.
[0153] According to one embodiment of this application, the fourth acquisition module 140 is further configured to: acquire the product between the energy release ratio parameter and the energy transfer ratio parameter, and use the product as the energy transfer index.
[0154] According to one embodiment of this application, the fifth acquisition module 150 is further configured to: acquire a first preset threshold and a second preset threshold of the energy transfer index; and acquire the evaluation result of the impact tendency based on the energy transfer index, the first preset threshold and the second preset threshold.
[0155] According to the coal impact tendency evaluation device provided in this application, the impact energy index and elastic energy index of the coal are obtained. Based on these indices, the energy release ratio parameter and energy transfer ratio parameter are obtained. Based on these parameters, the energy transfer index is obtained, and finally, the impact tendency evaluation result is obtained. This application obtains the impact tendency evaluation result based on the coal's energy transfer index. By considering more physical and mechanical parameters of the coal when obtaining the evaluation result, the accuracy and reliability of the impact tendency evaluation result are improved, and the precision of the evaluation result is guaranteed.
[0156] To implement the above embodiments, this application also proposes an electronic device 2000, such as... Figure 13 As shown, it includes a memory 210, a processor 220, and a computer program stored in the memory 210 and capable of running on the processor 220. When the processor executes the program, it implements the aforementioned method for evaluating the coal impact tendency.
[0157] To implement the above embodiments, this application also proposes a non-transitory computer-readable storage medium storing a computer program that, when executed by a processor, implements the aforementioned method for evaluating the coal impact tendency.
[0158] To achieve the above embodiments, this application also proposes a computer program product, including a computer program that, when executed by a processor, implements the coal impact tendency evaluation method as described above.
[0159] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this application can be achieved, and this is not limited herein.
[0160] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.
Claims
1. A method for evaluating the impact liability of a coal body, characterized by, The method includes: Obtain the impact energy index and the elastic energy index of the coal body; The energy release ratio parameter of the coal body is obtained based on the impact energy index and the elastic energy index. Obtain the energy transfer ratio parameters of the coal body; The energy transfer index of the coal body is obtained based on the energy release ratio parameter and the energy transfer ratio parameter. Based on the energy transfer index, the evaluation result of the impact tendency of the coal body is obtained; The step of obtaining the energy release ratio parameter of the coal body based on the impact energy index and the elastic energy index further includes: Obtain the product between the impact energy index and the elastic energy index; The energy release ratio parameter is obtained based on the product and the elastic energy index; The step of obtaining the energy transfer ratio parameter of the coal body further includes: The first energy transfer of the coal body in the main direction, the second energy transfer of the coal body in the direction perpendicular to the main direction, and the third energy transfer of the coal body in the direction parallel to the main direction are obtained, wherein the main direction is the direction of the coal body toward the roadway; The energy transfer ratio parameter is obtained based on the first transferred energy, the second transferred energy, and the third transferred energy. The step of obtaining the energy transfer index of the coal body based on the energy release ratio parameter and the energy transfer ratio parameter further includes: Obtain the product between the energy release ratio parameter and the energy transfer ratio parameter, and use the product as the energy transfer index; The method of obtaining the evaluation result of the impact tendency of the coal body based on the energy transfer index further includes: Obtain the first preset threshold and the second preset threshold of the energy transfer index; The evaluation result of the impact tendency is obtained based on the energy transfer index, the first preset threshold, and the second preset threshold.
2. The evaluation method according to claim 1, characterized by The method further includes: Obtain the first stress coefficient of the coal body in the main direction, the second stress coefficient of the coal body in the direction perpendicular to the main direction, and the third stress coefficient of the coal body in the direction parallel to the main direction; The energy transfer ratio parameter is obtained based on the first stress coefficient, the second stress coefficient, and the third stress coefficient.
3. The evaluation method according to claim 2, characterized by, The method further includes: Obtain the burial depth of the coal body; Based on the burial depth, obtain the range of the energy release ratio parameter; The minimum value of the energy release ratio parameter is selected from the range of the energy release ratio parameter as the energy transfer ratio parameter.
4. A device for evaluating the impact tendency of coal seams, characterized in that, The device includes: The first acquisition module is used to acquire the impact energy index and the elastic energy index of the coal body; The second acquisition module is used to acquire the energy release ratio parameter of the coal body based on the impact energy index and the elastic energy index. The third acquisition module is used to acquire the energy transfer ratio parameter of the coal body; The fourth acquisition module is used to acquire the energy transfer index of the coal body based on the energy release ratio parameter and the energy transfer ratio parameter. The fifth acquisition module is used to acquire the evaluation result of the impact tendency of the coal body based on the energy transfer index; The third acquisition module is also used for: The first energy transfer of the coal body in the main direction, the second energy transfer of the coal body in the direction perpendicular to the main direction, and the third energy transfer of the coal body in the direction parallel to the main direction are obtained, wherein the main direction is the direction of the coal body toward the roadway; The energy transfer ratio parameter is obtained based on the first transferred energy, the second transferred energy, and the third transferred energy. The fourth acquisition module is also used for: Obtain the product between the energy release ratio parameter and the energy transfer ratio parameter, and use the product as the energy transfer index; The fifth acquisition module is also used for: Obtain the first preset threshold and the second preset threshold of the energy transfer index; The evaluation result of the impact tendency is obtained based on the energy transfer index, the first preset threshold, and the second preset threshold.
5. An electronic device, comprising: Including memory and processor; The processor reads executable program code stored in the memory to run a program corresponding to the executable program code, so as to implement the method as described in any one of claims 1-3.
6. A non-transitory computer-readable storage medium having stored thereon computer instructions, wherein, The computer instructions are used to cause the computer to perform the method according to any one of claims 1-3.