Determination method and system for layered fully-mechanized caving mining scheme of extra-thick coal seam

Abstract

The invention provides a method and system for determining a layered fully-mechanized caving mining scheme of an extra-thick coal seam, and the method comprises the steps: analyzing the top coal caving property of the extra-thick coal seam through combining a borehole peeping analysis method, a theoretical analysis method and a PFC numerical simulation analysis method, and judging whether the top coal caving property of the extra-thick coal seam is suitable for fully-mechanized caving mining or not; under the condition of being suitable for fully-mechanized caving mining, the top coal caving performance, safety and economical efficiency under different layered fully-mechanized caving mining schemes are compared and analyzed, and the number of layers of the extra-thick coal seam is determined; based on the number of the layers and the parameters of the extra-thick coal seam, designing a plurality of PFC numerical simulation schemes for the thickness of the layers, and determining the thickness of each layer by comparing the top coal recovery rates of different PFC numerical simulation schemes. According to the method, the layering number and the layering thickness of layered fully-mechanized caving mining are reasonably determined on the premise that the top coal caving property analysis is ensured to be suitable for fully-mechanized caving mining, and the resource recovery rate can be improved on the basis that safe mining of the extra-thick coal seam is ensured.

Description

Technical Field

[0001] The present application relates to the field of coal mining technology, and in particular to a method and system for determining a fully-mechanized caving mining plan for an extra-thick coal seam. Background Art

[0002] Currently, amidst the continued growth in energy demand, coal remains a crucial energy source. Ultra-thick coal seams (generally those exceeding 8 meters in thickness) are a key target for high-yield and high-efficiency mine development due to their large reserves and high mining efficiency.

[0003] In the prior art, mining of extremely thick coal seams typically involves either a single fully mechanized caving method or traditional stratified mining. However, in practice, the single fully mechanized caving method is prone to imbalanced mining and caving ratios, resulting in poor top coal caving performance and low recovery rates. While traditional stratified mining can reduce the thickness of a single layer, the process is complex, leading to cumulative rock disturbances and difficulty controlling inter-layer temporal and spatial coordination, potentially causing coal rock instability and abnormal gas influx.

[0004] Therefore, how to improve the resource recovery rate of fully-mechanized caving mining in extra-thick coal seams and ensure safe mining has become an urgent problem that needs to be solved. Summary of the Invention

[0005] The present application aims to solve one of the technical problems in the related art at least to a certain extent.

[0006] To this end, the first purpose of this application is to propose a method for determining a stratified fully-mechanized caving mining plan for extra-thick coal seams. This method analyzes the top coal caving characteristics through a variety of analysis methods, and reasonably determines the number and thickness of stratified fully-mechanized caving mining on the premise that it is suitable for fully-mechanized caving mining. This method can improve the resource recovery rate of mining on the basis of ensuring the safe mining of extra-thick coal seams.

[0007] The second purpose of this application is to propose a system for determining a fully-mechanized caving mining plan for an extra-thick coal seam.

[0008] The third objective of this application is to provide an electronic device.

[0009] A fourth object of the present application is to provide a non-transitory computer-readable storage medium.

[0010] To achieve the above-mentioned objectives, the first aspect of the present application is to propose a method for determining a fully-mechanized caving mining scheme for an extremely thick coal seam, comprising the following steps:

[0011] Combining borehole peek analysis, theoretical analysis, and particle flow program (PFC) numerical simulation analysis, the top coal caving characteristics of extra-thick coal seams were analyzed to determine whether the top coal caving characteristics of the extra-thick coal seams are suitable for fully mechanized caving mining.

[0012] Under the condition that fully-mechanized caving mining is suitable, the top coal caving performance, safety and economy of different fully-mechanized caving mining schemes are compared and analyzed to determine the number of layers for the extra-thick coal seam;

[0013] Based on the number of layers and the parameters of the extra-thick coal seam, a plurality of PFC numerical simulation schemes for layer thickness are designed, and the thickness of each layer is determined by comparing the top coal recovery rates of different PFC numerical simulation schemes.

[0014] Optionally, in one embodiment of the present application, the top coal caving properties of the extra-thick coal seam are analyzed by the borehole peek analysis method, including: arranging multiple top coal peek boreholes on the working face of the extra-thick coal seam, and obtaining the detection results of each top coal peek borehole; and determining the overall strength, crack development and degree of fragmentation of the extra-thick coal seam by analyzing the detection results of all the top coal peek boreholes.

[0015] Optionally, in one embodiment of the present application, the top coal caving properties of the extra-thick coal seam are analyzed by the theoretical analysis method, including: analyzing the correspondence between the compressive strength of the extra-thick coal seam and the top coal collapse angle, and substituting the detected compressive strength of the extra-thick coal seam into the corresponding relationship to obtain the top coal collapse angle of the extra-thick coal seam, and evaluating the top coal caving properties of the extra-thick coal seam based on the top coal collapse angle; calculating the direct roof thickness threshold under different stratified comprehensive mining schemes, and combining the direct roof thickness threshold and the roof lithology of the extra-thick coal seam to determine whether the roof conditions of the extra-thick coal seam meet the top coal caving requirements; calculating the target coal seam burial depth based on the detected compressive strength of the extra-thick coal seam, and comparing whether the burial depth of the extra-thick coal seam is greater than the target coal seam burial depth.

[0016] Optionally, in one embodiment of the present application, the top coal caving characteristics of the extra-thick coal seam are analyzed by the particle flow program PFC numerical simulation analysis method, including: establishing a three-dimensional geomechanical model of the extra-thick coal seam based on the PFC numerical simulation technology, and setting the parameters of the three-dimensional geomechanical model; setting the coal cutting height during the simulated mining process, and simulating the top coal caving conditions of the extra-thick coal seam under different stratified fully-mechanized caving mining schemes; and determining the number of multiple candidate strata suitable for fully-mechanized caving mining based on the simulation results under the different stratified fully-mechanized caving mining schemes.

[0017] Optionally, in one embodiment of the present application, a comparative analysis is conducted on the safety under the different stratified comprehensive mining schemes, including: analyzing the disaster management process of spontaneous combustion, rock burst, gas, water accumulation and roof disasters under the different stratified comprehensive mining schemes, and determining a stratified comprehensive mining scheme that meets the requirements for safe mining of the working face.

[0018] Optionally, in one embodiment of the present application, the disaster management process of spontaneous combustion under the different stratified comprehensive caving mining schemes is analyzed, including: determining the daily advancement speed of the working face required for different stratified comprehensive caving mining schemes based on the shortest natural combustion period and working face length of the extra-thick coal seam; and comparing the probability of spontaneous combustion under different stratified comprehensive caving mining schemes in combination with the daily advancement speed of the working face and the fire prevention measures taken on the working face.

[0019] Optionally, in one embodiment of the present application, based on the number of layers and the parameters of the extra-thick coal seam, multiple PFC numerical simulation schemes for layer thickness are designed, including: setting the mining height according to the average thickness of the extra-thick coal seam, and determining the single-layer coal thickness of each layer according to the average thickness and the number of layers; determining the thickness of each layer by comparing the top coal recovery rates of different PFC numerical simulation schemes, including: using the single-layer coal thickness of each layer corresponding to the scheme with the largest top coal recovery rate among the multiple PFC numerical simulation schemes as the thickness of each layer when the extra-thick coal seam is subjected to layered fully-mechanized caving mining.

[0020] To achieve the above objectives, the second aspect of the present application further proposes a system for determining a fully mechanized caving mining plan for an extra-thick coal seam, comprising the following modules:

[0021] An analysis module is used to analyze the top coal caving characteristics of extra-thick coal seams by combining a borehole peek analysis method, a theoretical analysis method, and a particle flow program (PFC) numerical simulation analysis method to determine whether the top coal caving characteristics of the extra-thick coal seams are suitable for fully-mechanized caving mining;

[0022] A layer number determination module is used to compare and analyze the top coal caving performance, safety, and economy of different layered fully-mechanized caving mining schemes when the fully-mechanized caving mining scheme is suitable, and determine the number of layers in the extra-thick coal seam;

[0023] The layer thickness determination module is used to design multiple PFC numerical simulation schemes for layer thickness based on the number of layers and the parameters of the extra-thick coal seam, and determine the thickness of each layer by comparing the top coal recovery rates of different PFC numerical simulation schemes.

[0024] In order to implement the above embodiment, the third embodiment of the present application further proposes an electronic device, including:

[0025] at least one processor; and

[0026] a memory communicatively connected to the at least one processor; wherein,

[0027] The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method for determining the super-thick coal seam stratified fully-mechanized mining plan as described in the first aspect above.

[0028] In order to implement the above-mentioned embodiments, the fourth aspect of the present application also proposes a non-temporary computer-readable storage medium on which a computer program is stored. When the computer program is executed by the processor, the method for determining the stratified comprehensive mining plan for the extra-thick coal seam in the above-mentioned first aspect is implemented.

[0029] The technical solution provided by the embodiments of the present application brings at least the following beneficial effects: the present application first analyzes the top coal caving characteristics of extra-thick coal seams by combining the borehole peek analysis method, the theoretical analysis method and the PFC numerical simulation analysis method; then, from multiple perspectives such as top coal caving characteristics, safety and economy, the rationality of the fully-mechanized caving mining schemes with different numbers of layers is analyzed to determine the number of layers; finally, the PFC numerical simulation technology is used to compare the top coal recovery rates of different schemes to determine the thickness of the fully-mechanized caving mining layer. Thus, the present application analyzes the top coal caving characteristics through multiple analysis methods, and rationally determines the number and thickness of layers for fully-mechanized caving mining on the premise of ensuring that it is suitable for fully-mechanized caving mining. It can improve the resource recovery rate of fully-mechanized caving mining on the basis of ensuring the safe mining of extra-thick coal seams. The fully-mechanized caving mining scheme determined by the present application integrates the geological condition evaluation, can realize the optimization and dynamic regulation of mining parameters, provides theoretical support for the safe and efficient development of extra-thick coal seams, and improves the safety, rationality and intelligence of fully-mechanized caving mining in extra-thick coal seams.

[0030] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0032] Figure 1 A flow chart of a method for determining a fully-mechanized caving mining scheme for an extra-thick coal seam proposed in an embodiment of the present application;

[0033] Figure 2 A flowchart of a method for determining a specific fully-mechanized caving mining scheme for an extra-thick coal seam proposed in an embodiment of the present application;

[0034] Figure 3 A schematic diagram of the relationship between the coal seam hardness coefficient and the top coal collapse angle proposed in an embodiment of the present application;

[0035] Figure 4This is a structural diagram of a system for determining a fully mechanized caving mining scheme for an extra-thick coal seam proposed in an embodiment of the present application. DETAILED DESCRIPTION

[0036] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0037] It should be noted that in the relevant embodiments, the ultra-thick coal seam can be divided into several layers by using the layered fully-mechanized caving mining technology, and the ultra-thick coal seam can be stratified and fully-mechanized by combining the comprehensive mechanized top coal caving process. However, the design of the stratified fully-mechanized caving mining scheme is significantly complex: the scientific division of the layer thickness and the number of layers directly affects the top coal crushing effect and recovery rate; the mining sequence (upward or downward) needs to balance the overburden movement and the law of mine pressure manifestation; the optimization of the temporal and spatial relationship between layers (offset, interval time) involves the control of surrounding rock stability under the action of multi-field coupling. However, the research in the relevant embodiments mostly focuses on a single layer parameter or local process optimization, lacks a systematic theoretical model and dynamic decision-making method, resulting in actual engineering often relying on trial and error, which restricts the improvement of resource recovery efficiency and safety assurance level.

[0038] To this end, this application proposes a method for determining a stratified fully-mechanized caving mining plan for extra-thick coal seams. By integrating geological condition evaluation, mining parameter optimization and dynamic regulation into the stratified fully-mechanized caving mining plan determination method of this application, theoretical support can be provided for the safe and efficient development of extra-thick coal seams.

[0039] The following describes, with reference to the accompanying drawings, a method and system for determining a fully-mechanized caving mining scheme for an extra-thick coal seam proposed in an embodiment of the present application.

[0040] Figure 1 This is a flow chart of a method for determining a super-thick coal seam stratified fully-mechanized caving mining scheme proposed in an embodiment of the present application, as shown in FIG. Figure 1 As shown, the method includes the following steps:

[0041] Step S101: combining the borehole peek analysis method, the theoretical analysis method and the particle flow program PFC numerical simulation analysis method to analyze the top coal caving properties of the extra-thick coal seam and determine whether the top coal caving properties of the extra-thick coal seam are suitable for fully mechanized caving mining.

[0042] Specifically, this application first analyzes the caving properties of the extra-thick coal seam for which a mining plan is to be formulated, and comprehensively analyzes whether the caving properties of the top coal of the coal seam are suitable for fully-mechanized caving. As a possible implementation method, the caving properties analysis of the top coal is mainly achieved by combining the following three analysis methods: the first method is to arrange a number of peep drill holes at different positions of the working face, and grasp the development and fragmentation of the top coal cracks by analyzing the peep results, so as to evaluate the caving properties of the top coal of the extra-thick coal seam; the second method is to conduct a theoretical analysis of the caving properties of the top coal, and evaluate the caving properties of the top coal of the fully-mechanized caving mining of the extra-thick coal seam by comprehensively analyzing factors such as the compressive strength of the coal seam, the roof conditions and the burial depth; the third method is to perform a numerical simulation of the caving properties of the top coal of the extra-thick coal seam, and use the numerical simulation method of the particle flow code (PFC) to establish a three-dimensional geomechanical model to simulate and analyze the caving properties of the top coal of the extra-thick coal seam when the full-thickness caving, two-layer stratified caving and three-layer stratified caving are used in one-time mining.

[0043] In order to more clearly and intuitively illustrate the specific implementation process of determining the ultra-thick coal seam stratified fully mechanized caving mining scheme in this application, the following takes the A mining area of ​​a certain mine in actual application (the average coal seam thickness is 42m, which meets the ultra-thick coal seam conditions) as an example, combined with Figure 2 The specific process for determining the stratified fully-mechanized caving mining plan for extra-thick coal seams shown is used as an example to illustrate the determination of the stratified fully-mechanized caving mining plan for extra-thick coal seams in mining area A.

[0044] In this example, if Figure 2 As shown, when analyzing the top coal caving property of extra-thick coal seams, the following can be performed in parallel: top coal drilling peek analysis, top coal caving property theoretical analysis, and top coal caving property PFC numerical simulation analysis.

[0045] In one embodiment of the present application, the top coal caving characteristics of the extra-thick coal seam are analyzed by a borehole peek analysis method, including: arranging multiple top coal peek boreholes on the working face of the extra-thick coal seam to obtain the detection results of each top coal peek borehole; and determining the overall strength, crack development and degree of fragmentation of the extra-thick coal seam by analyzing the detection results of all top coal peek boreholes.

[0046] For example, to understand the development and fragmentation of top coal fissures, we conducted field exploration of the top coal above the cut in the No. 1 working face of Mining Area A using borehole peepholes. Nine peepholes were arranged along the working face, with a designed depth of 12 meters. The specific detection results obtained for each top coal peephole are shown below:

[0047] (1) Drilling of No. 1 coal seam: cracks developed in the coal body at 1.05 to 4.85 m; the coal body was broken as a whole; and a collapse occurred at 9.9 m.

[0048] (2) Drilling of No. 2 coal seam: The coal body at 0-3.8m showed layered texture and was relatively broken; the coal body at 3.8-9.9m had developed fissures and was relatively broken; the coal body at 9.9-12.2m was relatively intact, and the bottom of the hole was reached at 12.2m.

[0049] (3) Drilling of 3# coal seam: The coal body at 0-2.8m showed layered texture and was relatively broken; the coal body at 3.8-8.8m had developed fissures and was relatively broken; a collapse occurred at 8.8m.

[0050] (4) Drilling of 4# coal seam: The coal body at 0-2.5m showed layered texture and was relatively broken; the coal body at 2.5-10.8m had developed cracks and was relatively broken; a collapse occurred at 10.8m.

[0051] (5) Drilling of 5# coal seam: The coal body at 0-3.9m showed layered texture and was relatively broken; the coal body at 3.9-12.1m had developed fissures and was relatively broken; the bottom of the hole was reached at 12.1m.

[0052] (6) Drilling of 6# coal seam: The coal body at 0-6m showed layered texture and was relatively broken; the coal body at 6-12m had developed fissures and was relatively broken; the bottom of the hole was reached at 12.0m.

[0053] (7) Drilling of No. 7 coal seam: The coal body at 0-4.3m showed layered texture and was relatively broken; the coal body at 4.3-12.1m had developed fissures and was relatively broken; the bottom of the hole was reached at 12.1m.

[0054] (8) Drilling of 8# coal seam: The coal body at 0-3.6m showed layered texture and was relatively broken; the coal body at 4.3-12.1m had developed fissures and was relatively broken; the bottom of the hole was reached at 12.1m.

[0055] (9) Drilling hole in coal seam No. 9: The coal body at 0.8-3.9m showed layered texture and was relatively broken; the coal body at 3.9-5.6m had developed fissures and was relatively broken; the hole collapsed at 5.6m.

[0056] Furthermore, the above-mentioned top-coal drilling results show that the overall strength of this coal seam is relatively low, with high levels of crack development and fragmentation. Five of the nine drilling holes experienced varying degrees of collapse during the exploration process, with the highest degree of fragmentation occurring in the shallow 0-4 m depth of the top coal. Therefore, the fracture development in this coal seam is conducive to the caving of top coal.

[0057] In one embodiment of the present application, the top coal caving property of an extra-thick coal seam is analyzed by a theoretical analysis method, comprising the following steps: first, analyzing the correspondence between the compressive strength of the extra-thick coal seam and the top coal collapse angle, and substituting the detected compressive strength of the extra-thick coal seam into the corresponding relationship to obtain the top coal collapse angle of the extra-thick coal seam, and evaluating the top coal caving property of the extra-thick coal seam based on the top coal collapse angle. Then, the direct roof thickness threshold under different stratified fully-mechanized caving mining schemes is calculated, and combined with the direct roof thickness threshold and the roof lithology of the extra-thick coal seam, it is determined whether the roof conditions of the extra-thick coal seam meet the top coal caving requirements. Finally, based on the detected compressive strength of the extra-thick coal seam, the target coal seam burial depth is calculated, and a comparison is made to determine whether the burial depth of the extra-thick coal seam is greater than the target coal seam burial depth.

[0058] Specifically, this embodiment evaluates the top coal caving performance of fully-mechanized caving mining in extra-thick coal seams by comprehensively analyzing factors such as the compressive strength of the coal seam, roof conditions, and burial depth.

[0059] Continuing to refer to the above example, on the first aspect, the influence of the compressive strength of the coal seam on the caving of the top coal is analyzed. Since the compressive strength (Rc) of the coal seam affects the destruction process and degree of crushing of the top coal under pressure, it is closely related to the collapse angle of the top coal. According to the on-site observation of the fully-mechanized caving working face, this embodiment shows that the greater the compressive strength (Rc), that is, the harder the top coal, the smaller the collapse angle of the top coal. According to the law of the caving movement of the top coal, when the collapse angle of the top coal is small, it is not conducive to the release of the top coal. Thus, it is obtained as follows Figure 3 The relationship between the coal seam hardness coefficient f (f = Rc / 10) and the top coal collapse angle ɑ is shown.

[0060] Then, through the physical and mechanical experiments on the coal samples, we know that the average compressive strength of the coal seam is 7.8MPa, and the overall strength of the coal seam is relatively weak. Figure 3 The relationship shown in the figure shows that the top coal of this coal seam has a collapse angle greater than 100° and exhibits a loose nature. Therefore, from the overall analysis of the coal seam's compressive strength, it can be concluded that the top coal of this coal seam can basically be mined and vented at any time, with good venting properties.

[0061] Secondly, the influence of roof conditions on the caving performance of top coal is analyzed. The coal seam roof consists of two parts, namely the direct roof and the basic roof. The direct roof affects the caving movement process of the top coal. The direct roof that can caving as it is mined and has a certain thickness is the basic condition for the smooth caving of the top coal after it is crushed and caving in top coal caving. If the direct roof caving lags behind or the caving thickness is small, the crushed and caving top coal will collapse into the goaf outside the caving body, causing the top coal to be unable to be caved and lost. Therefore, the influence of the direct roof on the caving performance of top coal is manifested in two aspects; the first is that it must be able to caving as it is mined, and the second is that it must have a certain thickness after caving, that is, the degree of filling of the goaf. According to on-site observations and similar simulation tests, the minimum thickness of the direct roof required for fully mechanized caving can be calculated by the following formula:

[0062] Σhmin=M / Kp

[0063] Among them, Σh represents the sum of the thickness of the layers that can be mined and released, in meters; M represents the mining height, in meters; Kp represents the rock expansion coefficient, which is taken as 1.4.

[0064] Therefore, the above formula is used to calculate the minimum direct roof thickness required for different layered fully mechanized caving mining schemes:

[0065] The first option is full-layer fully-mechanized caving mining: when the working face mining height is 42m and the rock expansion coefficient is 1.4, the minimum direct roof thickness required for fully-mechanized caving mining is 30m.

[0066] The second option: When the working face mining height is 21m and the rock expansion coefficient is 1.4, the minimum direct roof thickness required for fully mechanized caving is 15m;

[0067] The third option: When the working face mining height is 14m and the rock expansion coefficient is 1.4, the minimum direct roof thickness required for fully mechanized caving is 10m.

[0068] Furthermore, analysis of the coal seam's lithology revealed that the seam's roof is primarily composed of siltstone and argillaceous siltstone, followed by sandstone of various particle sizes, interbedded with mudstone and silty mudstone. The rock mass quality of the immediate roof of this coal seam is primarily graded as IV (poor rock mass quality), while in areas with sandy rock distribution, the rock mass quality is generally graded as III (medium rock mass quality). Within 30 meters above the coal seam, there is a lack of hard rock formations exceeding 10 meters. Therefore, combined with the immediate roof thickness threshold and roof lithology analysis results of this coal seam, it can be seen that this coal seam can generally meet the requirements of simultaneous mining and caving during fully-mechanized caving, and the roof properties are conducive to good caving performance of the top coal.

[0069] Third, the influence of coal seam depth on the caving performance of top coal is analyzed. When the coal body strength (Rc) is constant and the parameters of other influencing factors remain unchanged, in order for the top coal body to be completely destroyed under the support pressure, the coal seam depth (H) should satisfy the following formula:

[0070] H≥21.96Rc

[0071] It can be seen from the formula that when H is larger, the critical failure condition of the top coal is easier to meet. When the unidirectional compressive strength Rc of the coal seam is constant, the more H is greater than the critical value, the better the top coal crushing effect will be, which is reflected in the better top coal caving performance.

[0072] In this example, based on the average compressive strength of the coal seam roof (Rc) of 7.8 MPa, the required burial depth for top coal caving is 171 m. However, based on actual conditions, the overall burial depth of the coal seams in this mining area is greater than 500 m. Therefore, the burial depth analysis indicates that this coal seam meets the requirements for fully-mechanized top coal caving.

[0073] Therefore, through the comprehensive theoretical analysis of the above three aspects, it can be seen that the top coal caving conditions of the coal seam in mining area A are good and suitable for fully mechanized caving mining.

[0074] In one embodiment of the present application, the top coal caving characteristics of extra-thick coal seams are analyzed by using a particle flow program PFC numerical simulation analysis method, which includes the following steps: first, a three-dimensional geomechanical model of the extra-thick coal seam is established based on the PFC numerical simulation technology, and the parameters of the three-dimensional geomechanical model are set; then, the coal cutting height during the simulated mining process is set to simulate the top coal caving conditions of the extra-thick coal seam under different stratified fully-mechanized caving mining schemes; finally, based on the simulation results under different stratified fully-mechanized caving mining schemes, the number of multiple candidate strata suitable for fully-mechanized caving mining is determined.

[0075] Continuing with the coal seam in mining area A in the above example as the engineering context, the PFC numerical simulation analysis process is illustrated. First, a three-dimensional geomechanical model is established using PFC numerical simulation. Since the top coal in this mining area is soft coal, a granular particle model is used for simulation, with the coal seam thickness set to 42m and the roof thickness to 30m. During the simulation, the coal cutting heights were set to 3.5m and 4.0m, respectively. The top coal caving characteristics of extra-thick coal seams over 40m thick were analyzed using single-shot full-thickness fully mechanized caving, two-layer fully mechanized caving, and three-layer fully mechanized caving. The simulation schemes are shown in Table 1 below:

[0076] Table 1 Hierarchical simulation scheme

[0077]

[0078] Furthermore, the volumes of coal mined through the cutting and caving processes are defined as the cut volume and caving volume, respectively. The sum of the cut volume and caving volume, as a percentage of the total model coal volume, is referred to as the total recovery rate. Based on the simulation results for Experimental Schemes 1-6, the cut volume, caving volume, and total recovery rate for each scheme were statistically analyzed. The simulation results for schemes with different numbers of strata were statistically analyzed, as shown in Table 2 below:

[0079] Table 2 Scheme simulation results data table

[0080]

[0081] Therefore, according to the experimental results in Table 2, except for the unsatisfactory top coal recovery rate of the whole-layer fully-mechanized caving, which will cause a large waste of resources, the top coal recovery rates of the two-layer and three-layer fully-mechanized caving are both above 84%. It can be seen that the top coal caving performance under these schemes is good and suitable for fully-mechanized caving mining.

[0082] Therefore, by combining the analysis results of the above three top coal caving analysis methods, it can be seen that the top coal caving conditions in the A mining area of ​​the mine are good and suitable for fully mechanized caving mining.

[0083] Step S102: When fully-mechanized caving mining is suitable, comparative analysis is performed on the top coal caving performance, safety, and economy of different fully-mechanized caving mining schemes to determine the number of layers in the extra-thick coal seam.

[0084] Specifically, such as Figure 2 As shown in the figure, when it is judged in the previous step that the current extra-thick coal seam is suitable for fully-mechanized caving mining, the obtained top coal caving performance analysis results are used to analyze the more reasonable scheme among different stratified fully-mechanized caving mining schemes from the perspectives of top coal caving performance, safety, and economy. Thus, by comparing and analyzing various stratified fully-mechanized caving mining schemes, the reasonable number of strata n in the stratified fully-mechanized caving mining scheme for extra-thick coal seams is determined.

[0085] Continuing with the above example, when conducting a comparative analysis of top coal caving performance, the PFC numerical simulation results show that, with a mining height of 4.0m, the required mining-to-caving height ratio to ensure sufficient crushing and caving space for the top coal in the fully-mechanized caving face is no greater than 1:(4.625-6.16), and the required mining height to meet this requirement is 22.5-28.4m. Furthermore, a comprehensive analysis of multiple factors affecting top coal caving performance shows that both two-layer and three-layer fully-mechanized caving have good caving performance. Therefore, from the perspective of top coal caving performance, both two-layer and three-layer fully-mechanized caving are feasible.

[0086] In one embodiment of the present application, a comparative analysis of the safety under different stratified comprehensive mining schemes is conducted, including: analyzing the disaster management process of spontaneous combustion, rock burst, gas, water accumulation and roof disasters under different stratified comprehensive mining schemes, and determining a stratified comprehensive mining scheme that meets the requirements for safe mining on the working face.

[0087] The following continues to use the above examples to explain in detail the impact of various factors in the security analysis process.

[0088] First, in this embodiment, the disaster management process of spontaneous combustion under different stratified fully-mechanized coal caving mining schemes is analyzed, including: determining the daily advancement speed of the working face required for different stratified fully-mechanized coal caving mining schemes based on the shortest natural combustion period and working face length of the extra-thick coal seam; and comparing the probability of spontaneous combustion under different stratified fully-mechanized coal caving mining schemes in combination with the daily advancement speed of the working face and the fire prevention measures taken on the working face.

[0089] Specifically, the coal seam in Mining Area A has been determined to be a Class I self-igniting coal seam, with a minimum spontaneous combustion period of 25 days. To prevent spontaneous combustion accidents in the goaf, the minimum advance rate of the working face is required to be no less than 3.4 m / day without nitrogen injection. With nitrogen injection in the goaf, the minimum advance rate should be no less than 1.7 m / day. Given a certain production capacity, both the thickness and length of the working face layer will affect the advance rate.

[0090] Among them, as shown in the following Tables 3 and 4, the daily advancement speed of the mined working face in the mining area under different mining heights, layer thicknesses and face lengths is statistically analyzed respectively.

[0091] Table 3 Work data statistics

[0092]

[0093]

[0094] Table 4 Work data statistics

[0095]

[0096]

[0097] Furthermore, to ensure high mining efficiency and top coal recovery rates at the working face, the working face length should not be too short and can be set to the current length of 200m. With a working face length of 200m, the daily working face advance rates are 2.4m / d and 3.8m / d for layer thicknesses of 22m and 14m, respectively. During coal face recovery, comprehensive fire prevention and extinguishing measures were implemented, including nitrogen injection, inhibitor spraying, goaf plugging, and water sprinkling for cooling. Therefore, with effective fire prevention and extinguishing measures such as nitrogen injection, two-layer fully mechanized top-coal caving can be implemented in the extra-thick coal seams of Mining Area A. The reduction in the number of layers reduces the number of working face arrangements and the number of repeated goaf excavations in the mining area, significantly reducing the probability of spontaneous combustion at the working face.

[0098] Therefore, by analyzing the daily advancement speed of the working face and the fire prevention measures taken on the working face, it can be seen that the use of two-layer fully-mechanized top-caving mining is beneficial to the prevention and control of spontaneous combustion of coal seams on the basis of ensuring the advancement speed and taking necessary fire prevention and extinguishing measures. The probability of spontaneous combustion in the two-layer fully-mechanized top-caving mining scheme is lower than that in the three-layer fully-mechanized top-caving mining scheme.

[0099] Secondly, analyze the impact of rock burst.

[0100] Continuing with the above example, the rock burst propensity of the coal seams and roof and floor plates in this mine are both Class II, meaning weak rock burst propensity. In working faces with rock burst risk, there is a very clear relationship between the working face advancement speed and the appearance of rock burst. The use of two-layer, high-mining-height fully-mechanized top-coal caving mining, due to the increased thickness of the initial extraction, reduces the progress required to achieve the same output, and reduces mining intensity. This, to a certain extent, allows for the slow release of accumulated energy in the coal seam. High-mining-height fully-mechanized top-coal caving mining does not significantly increase the risk level of rock burst and may even facilitate the release of energy in the top coal. Furthermore, based on established experience with rock burst occurrence and control, rock burst accidents primarily occur in mining tunnels. Reducing the number of layers also reduces the number of mining tunnels in the mining area and the tunnel advancement rate, thus reducing the probability of rock burst.

[0101] Therefore, the two-layer fully-mechanized caving of coal seams in mining area A is better than the three-layer fully-mechanized caving, which is beneficial to the prevention and control of rock burst disasters.

[0102] Third, analyze the impact of gas. Continuing with the example above, this mine has consistently been identified as a low-gas mine by gas grade assessment over the years, and gas has a minimal impact on fully mechanized caving (MLC) working face recovery. Compared to fully mechanized caving (MLC), the top coal thickness in a two-layer caving is greater, leading to higher gas emission during coal caving. To ensure safe mining at the working face, enhanced gas monitoring and ventilation are necessary.

[0103] Fourth, analyze the impact of water control. Continuing with the above example, this mine has no old waterlogging, and there are no old kilns or small coal mines surrounding the mine field. The aquifers above the coal seams are all extremely weak aquifers, with poorly developed pores and fractures and insufficient recharge sources. The aquifers that influx the mine water primarily release elastic and static reserves. As the mine is mined, these reserves are gradually drained, resulting in a dewatering type of mine field with limited impact on working face recovery. Therefore, compared to three-layer fully-mechanized top-coal caving, two-layer top-coal caving produces a greater primary mining thickness, increasing the height of the overburden damage. However, this has a smaller impact on water control, and due to the reduced number of working faces, the workload for water control can be reduced to a certain extent.

[0104] The fifth aspect is to analyze the impact of roof disasters. Continuing with the above example, the lithology of the coal seam roof in this mine is mainly siltstone and muddy siltstone, followed by sandstone of various particle sizes, interbedded with mudstone and silty mudstone. The rock mass quality classification of the direct roof of the coal seam is mainly Grade IV (poor rock mass quality). Generally, in the sandy rock distribution area, the rock mass quality classification is Grade III (medium rock mass quality). There is a lack of hard rock layers of more than 10 meters within 30 meters above the coal seam. Therefore, during fully mechanized caving, the requirements of mining and caving can generally be met, and effective filling of the goaf can be achieved. The thickness of the top coal in the two-layer fully mechanized caving mining is increased, the integrity of the top coal is enhanced, and the probability of roof leakage in the working face is reduced, which is beneficial to the roof management of the fully mechanized caving working face and the mining tunnel to a certain extent.

[0105] Therefore, through analysis from the perspectives of disaster management such as spontaneous combustion, rock burst, gas, water prevention and control, and roof, it is concluded that the use of two-layer fully mechanized caving mining is more conducive to the safe recovery of the working face than the three-layer fully mechanized caving mining.

[0106] Continuing with the above example, when conducting an economic analysis comparing the three-tiered versus two-tiered layout for mining this coal seam, the two-tiered layout is expected to eliminate 10 working faces, reducing the mine's 10,000-ton excavation rate by 6.84%. Based on a 5,000-meter excavation per working face, this translates to a savings of 60 million yuan. If one set of fully mechanized mining equipment serves five working faces, this saves two sets of equipment, totaling 400 million yuan. This translates to a cumulative savings of 1 billion yuan in roadway excavation and equipment procurement. Furthermore, the two-tiered layout reduces costs associated with roof, gas, and fire prevention, resulting from the thinner top coal in the three-tiered layout, significantly reducing mine production costs. Therefore, from an economic perspective, the two-tiered fully mechanized top-coal caving (JCM) layout offers significant advantages over the three-tiered layout.

[0107] Based on the above analysis, it can be concluded that the two-layer fully-mechanized top-coal caving mining method is more reasonable than the three-layer fully-mechanized top-coal caving mining method through a comprehensive comparative analysis of the top coal caving performance, safety and economy. Therefore, it can be determined that the reasonable number of layers n for the extra-thick coal seam in mining area A is 2.

[0108] Step S103: Based on the number of layers and the parameters of the extra-thick coal seam, multiple PFC numerical simulation schemes for layer thickness are designed, and the thickness of each layer is determined by comparing the top coal recovery rates of different PFC numerical simulation schemes.

[0109] Specifically, such as Figure 2As shown, after the number of layers n is determined in the previous step, the thickness of the layer for fully mechanized caving of extra-thick coal seams is determined. This application uses PFC numerical simulation software to analyze the top coal caving situation of different layer thicknesses in n-layer fully mechanized caving. According to the average thickness of the coal seam, the mining height is set to h, and several PFC numerical simulation schemes are designed (the thickness of each layer in each scheme is different) for simulated mining. The top coal recovery rates of different schemes are compared to determine the thickness of the fully mechanized caving layer, that is, the thickness of each layer in the scheme with the highest top coal recovery rate is used as the thickness of each layer of the extra-thick coal seam in the final layered fully mechanized caving scheme.

[0110] In one embodiment of the present application, based on the number of layers and the parameters of the extra-thick coal seam, multiple PFC numerical simulation schemes for layer thickness are designed, including: setting the mining height according to the average thickness of the extra-thick coal seam, and determining the single-layer coal thickness of each layer based on the average thickness and the number of layers; determining the thickness of each layer by comparing the top coal recovery rates of different PFC numerical simulation schemes, including: using the single-layer coal thickness of each layer corresponding to the scheme with the largest top coal recovery rate among multiple PFC numerical simulation schemes as the thickness of each layer when the extra-thick coal seam is mined in a layered fully-mechanized manner.

[0111] Continuing with the above example, PFC numerical simulation software was used to analyze the top coal caving situation when different layer thicknesses were selected in a two-layer fully-mechanized top coal caving mining plan. Based on the average thickness of the coal seam in mining area A of 42m, the mining height was set to 4.0m. The single-layer coal thickness of each layer was determined based on the average thickness and the two layers. That is, the sum of the single-layer coal thicknesses of each layer equaled 42m. Three PFC numerical simulation schemes were designed, as shown in Table 5 below:

[0112] Table 5 PFC numerical simulation scheme

[0113]

[0114] Furthermore, based on the simulation results of experimental schemes I-III in Table 5, the coal cutting amount, coal discharge amount and total recovery rate of each scheme were calculated, and the simulation results of different layer thickness schemes were obtained as shown in the following Table 6:

[0115] Table 6 Simulation results

[0116]

[0117] Analysis of Table 6 shows that, because Schemes I-III all employ two-layer mining, the coal cut volumes are essentially the same. For coal release and top coal recovery, the relationship is "Scheme II > Scheme III > Scheme I." Scheme I, with its uniform-height layered mining, has the lowest recovery rate, and Scheme II (23m + 19m) has a higher top coal recovery rate than Scheme III (25m + 17m). This indicates that reasonable non-uniform-height layered mining can achieve greater mining benefits.

[0118] Therefore, according to the above numerical simulation test results, when the average thickness of the coal seam in mining area A is 42m, the upper and lower layer thicknesses of the two-layer fully mechanized caving mining can be 23m and 19m respectively.

[0119] In summary, the method for determining the stratified fully-mechanized caving mining scheme for extra-thick coal seams in the embodiment of the present application first analyzes the top coal caving properties of extra-thick coal seams by combining the borehole peek analysis method, the theoretical analysis method, and the PFC numerical simulation analysis method; then, from multiple perspectives such as top coal caving properties, safety, and economy, the rationality of fully-mechanized caving mining schemes with different numbers of layers is analyzed to determine the number of layers; finally, the PFC numerical simulation technology is used to compare the top coal recovery rates of different schemes to determine the thickness of the fully-mechanized caving mining layer. Thus, the method analyzes the top coal caving properties through a variety of analysis methods, and rationally determines the number and thickness of layers for stratified fully-mechanized caving mining on the premise of ensuring that it is suitable for fully-mechanized caving mining. It can improve the resource recovery rate of fully-mechanized caving mining on the basis of ensuring the safe mining of extra-thick coal seams. The stratified fully-mechanized caving mining scheme determined by this method integrates the evaluation of geological conditions, can realize the optimization and dynamic regulation of mining parameters, provides theoretical support for the safe and efficient development of extra-thick coal seams, and improves the safety, rationality, and intelligence of stratified fully-mechanized caving mining in extra-thick coal seams.

[0120] In order to implement the above embodiment, the present application also proposes a system for determining a fully mechanized caving mining plan for an extra-thick coal seam. Figure 4 This is a structural diagram of a system for determining a super-thick coal seam stratified fully-mechanized caving mining scheme proposed in an embodiment of the present application, as shown in FIG. Figure 4 As shown, the system includes: an analysis module 100 , a layer number determination module 200 and a layer thickness determination module 300 .

[0121] Among them, the analysis module 100 is used to combine the borehole peek analysis method, the theoretical analysis method and the particle flow program PFC numerical simulation analysis method to analyze the top coal caving properties of the extra-thick coal seam and determine whether the top coal caving properties of the extra-thick coal seam are suitable for fully mechanized caving mining.

[0122] The layer number determination module 200 is used to compare and analyze the top coal caving performance, safety and economy of different layered fully-mechanized caving mining schemes when suitable for fully-mechanized caving mining, and determine the number of layers in the extra-thick coal seam.

[0123] The layer thickness determination module 300 is used to design multiple PFC numerical simulation schemes for layer thickness based on the number of layers and parameters of the extra-thick coal seam, and determine the thickness of each layer by comparing the top coal recovery rates of different PFC numerical simulation schemes.

[0124] It should be noted that the explanation of the embodiment of the method for determining the fully-mechanized caving mining plan for extra-thick coal seams mentioned above is also applicable to the system of this embodiment and will not be repeated here.

[0125] To sum up, the system for determining the stratified comprehensive mining plan for extra-thick coal seams in the embodiment of the present application integrates the evaluation of geological conditions, can realize the optimization and dynamic regulation of mining parameters, provides theoretical support for the safe and efficient development of extra-thick coal seams, and improves the safety, rationality and intelligence of stratified comprehensive mining in extra-thick coal seams.

[0126] In order to implement the above embodiment, the present application further proposes an electronic device, including:

[0127] at least one processor; and

[0128] a memory communicatively connected to the at least one processor; wherein,

[0129] The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method for determining the extra-thick coal seam stratified comprehensive mining plan as described in any one of the above-mentioned first aspect embodiments.

[0130] In order to implement the above-mentioned embodiments, the present application also proposes a non-temporary computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, it implements a method for determining a stratified comprehensive mining plan for an extra-thick coal seam as described in any one of the above-mentioned first aspect embodiments.

[0131] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0132] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0133] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0134] The logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing the 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 (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program 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 the following: an electrical connection with one or more wires (electronic devices), a portable computer disk cartridge (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and a portable compact disc read-only memory (CDROM). Furthermore, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing it in another suitable manner if necessary, and then storing it in a computer memory.

[0135] It should be understood that various parts of the present application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used to implement: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0136] Those skilled in the art will understand that all or part of the steps in the method of the above embodiment can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.

[0137] In addition, the functional units in the various embodiments of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into a module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0138] The storage medium mentioned above may be a read-only memory, a magnetic disk, or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application. Persons skilled in the art may make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A method for determining a fully-mechanized caving mining plan for an extra-thick coal seam, characterized in that: The following steps are involved: Combining borehole peek analysis, theoretical analysis, and particle flow program (PFC) numerical simulation analysis, the top coal caving characteristics of extra-thick coal seams were analyzed to determine whether the top coal caving characteristics of the extra-thick coal seams are suitable for fully mechanized caving mining. Under the condition that fully-mechanized caving mining is suitable, the top coal caving performance, safety and economy of different fully-mechanized caving mining schemes are compared and analyzed to determine the number of layers for the extra-thick coal seam; Based on the number of layers and the parameters of the extra-thick coal seam, a plurality of PFC numerical simulation schemes for layer thickness are designed, and the thickness of each layer is determined by comparing the top coal recovery rates of different PFC numerical simulation schemes.

2. The method according to claim 1, characterized in that The top coal caving characteristics of the extra-thick coal seam are analyzed by the borehole peek analysis method, including: Arranging a plurality of top coal peep drill holes on the working face of the extra-thick coal seam and obtaining detection results of each top coal peep drill hole; By analyzing the detection results of all the top coal peek holes, the overall strength, crack development and degree of fragmentation of the extra-thick coal seam are determined.

3. The method according to claim 1, characterized in that The theoretical analysis method is used to analyze the top coal caving properties of the extra-thick coal seam, including: Analyze the corresponding relationship between the compressive strength of the extra-thick coal seam and the top coal collapse angle, substitute the detected compressive strength of the extra-thick coal seam into the corresponding relationship to obtain the top coal collapse angle of the extra-thick coal seam, and evaluate the top coal caving property of the extra-thick coal seam based on the top coal collapse angle; Calculate the immediate roof thickness threshold under different fully-mechanized stratified coal caving mining schemes, and determine whether the roof conditions of the extra-thick coal seam meet the requirements for top coal caving by combining the immediate roof thickness threshold and the roof lithology of the extra-thick coal seam; The target coal seam burial depth is calculated based on the compressive strength of the extra-thick coal seam obtained by the detection, and a comparison is made to determine whether the burial depth of the extra-thick coal seam is greater than the target coal seam burial depth.

4. The method according to claim 1, wherein The top coal caving characteristics of the extra-thick coal seam are analyzed by the particle flow program PFC numerical simulation analysis method, including: Establishing a three-dimensional geomechanical model of the extra-thick coal seam based on PFC numerical simulation technology, and setting parameters of the three-dimensional geomechanical model; Setting the coal cutting height during the simulated mining process to simulate the top coal caving situation of the extra-thick coal seam under different fully-mechanized caving mining schemes; According to the simulation results under the different stratified fully-mechanized caving mining schemes, the number of multiple candidate strata suitable for fully-mechanized caving mining is determined.

5. The method according to claim 1, characterized in that A comparative analysis of the safety of different fully-mechanized caving mining schemes is conducted, including: The disaster management process of spontaneous combustion, rock burst, gas, water accumulation and roof disasters under the different stratified fully-mechanized caving mining schemes is analyzed to determine a stratified fully-mechanized caving mining scheme that meets the requirements of safe mining on the working face.

6. The method according to claim 5, characterized in that The disaster management process of spontaneous combustion under the different stratified fully mechanized caving mining schemes is analyzed, including: Based on the shortest spontaneous combustion period and working face length of the extra-thick coal seam, determine the daily working face advancement speed required for different stratified fully mechanized caving mining schemes; Combined with the daily advancement speed of the working face and the fire prevention measures taken at the working face, the probability of spontaneous combustion under different stratified fully-mechanized caving mining schemes was compared.

7. The method according to claim 1, characterized in that Based on the number of layers and the parameters of the extra-thick coal seam, multiple PFC numerical simulation schemes for layer thickness are designed, including: Setting the mining height according to the average thickness of the extra-thick coal seam, and determining the single-layer coal thickness of each layer according to the average thickness and the number of layers; The thickness of each layer is determined by comparing the top coal recovery rates of different PFC numerical simulation schemes, including: The single-layer coal thickness of each layer corresponding to the scheme with the largest top coal recovery rate among the multiple PFC numerical simulation schemes is used as the thickness of each layer when the super-thick coal seam is mined by fully-mechanized caving.

8. A system for determining a fully mechanized caving mining plan for an extra-thick coal seam, characterized in that: Includes the following modules: An analysis module is used to analyze the top coal caving characteristics of extra-thick coal seams by combining a borehole peek analysis method, a theoretical analysis method, and a particle flow program (PFC) numerical simulation analysis method to determine whether the top coal caving characteristics of the extra-thick coal seams are suitable for fully-mechanized caving mining; A layer number determination module is used to compare and analyze the top coal caving performance, safety, and economy of different layered fully-mechanized caving mining schemes when the fully-mechanized caving mining scheme is suitable, and determine the number of layers in the extra-thick coal seam; The layer thickness determination module is used to design multiple PFC numerical simulation schemes for layer thickness based on the number of layers and the parameters of the extra-thick coal seam, and determine the thickness of each layer by comparing the top coal recovery rates of different PFC numerical simulation schemes.

9. An electronic device comprising: at least one processor; as well as 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, and the instructions are executed by the at least one processor so that the at least one processor can execute the method for determining the super-thick coal seam stratified fully-mechanized caving mining plan as described in any one of claims 1-7.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for determining a fully-mechanized caving mining plan for an extra-thick coal seam according to any one of claims 1 to 7 is implemented.

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