Coal seam mining overburden movement range control method and system, storage medium, computer equipment

Abstract

The application discloses a coal seam mining overburden movement range control method and system, a storage medium and a computer device. The method comprises the following steps: determining a target ground area to be protected and a corresponding underground coal seam mining area, and obtaining the coal seam buried depth corresponding to the underground coal seam mining area, the overburden strength and the ground movement angle corresponding to the overburden movement caused by the coal seam mining; selecting an overburden cutting mode based on the overburden strength, wherein the overburden cutting mode comprises a vertical cutting mode and an oblique cutting mode; when the overburden strength falls within a soft rock range, the overburden cutting mode is determined as the vertical cutting mode; when the overburden strength falls within a hard rock range, the overburden cutting mode is determined as the oblique cutting mode; obtaining overburden cutting parameters based on the overburden cutting mode, and calculating the protective coal pillar size after the overburden cutting is implemented according to the coal seam buried depth, the ground movement angle and the overburden cutting parameters; and performing overburden cutting construction according to the protective coal pillar size, so as to control the overburden movement range.

Description

Technical Field

[0001] This application relates to the field of coal mining technology, and in particular to a method and system for controlling the movement range of overburden in coal seam mining, a storage medium, and a computer device. Background Technology

[0002] During underground coal seam mining, the formation of goafs causes the overlying strata to move, deform, and break down, ultimately transmitting this to the surface and triggering surface subsidence and movement within a certain range. To protect important facilities such as surface buildings, water bodies, and railways from the impact of mining, traditional engineering practices typically demarcate protective coal pillars from the boundary of the surface protection zone to the coal seam based on parameters such as coal seam depth and surface movement angle. Mining is prohibited within the area of ​​these coal pillars, thus limiting mining activities to outside the expected subsidence impact range.

[0003] However, the above-mentioned methods of setting up protective coal pillars rely entirely on the natural development of rock strata movement. The range of these pillars is often much larger than the actual surface area that needs to be protected. Especially when the coal seam is buried at a great depth, the width of the protective coal pillars extending outward increases significantly, resulting in a large amount of coal resources being permanently covered and unable to be mined, leading to serious waste of resources and restricting the production efficiency of the mine. Summary of the Invention

[0004] In view of this, this application provides a method and system for controlling the range of overburden movement in coal seam mining, a storage medium, and computer equipment. Based on the differences in overburden strength, a targeted vertical or oblique overburden cutting method is selected. Through active construction, a weakened isolation zone is formed in the overburden, blocking the transmission path of rock movement caused by mining to the surface protection area. Thus, while ensuring the safety of surface facilities, the required size of the protective coal pillar can be significantly reduced, a large amount of original overburdened resources can be released, and the coal resource recovery rate can be improved.

[0005] According to one aspect of this application, a method for controlling the movement range of overburden in coal seam mining is provided, comprising: The surface target area to be protected and its corresponding underground coal seam mining area are determined, and the coal seam burial depth, overburden strength, and surface movement angle corresponding to the overburden movement caused by coal seam mining are obtained for the underground coal seam mining area. The overburden cutting method is selected based on the overburden strength, wherein the overburden cutting method includes vertical cutting and oblique cutting. When the overburden strength falls within the soft rock range, the overburden cutting method is determined to be vertical cutting. When the overburden strength falls within the hard rock range, the overburden cutting method is determined to be oblique cutting. Based on the overburden cutting method, the overburden cutting parameters are obtained, and the size of the protective coal pillar after the overburden cutting is calculated according to the coal seam burial depth, the surface movement angle and the overburden cutting parameters. Based on the dimensions of the protective coal pillar, overburden cutting operations are performed to control the range of overburden movement.

[0006] According to another aspect of this application, a coal seam mining overburden movement range control system is provided, comprising: The data acquisition module is used to determine the surface target area to be protected and its corresponding underground coal seam mining area, and to acquire the coal seam burial depth, overburden strength and surface movement angle corresponding to the overburden movement caused by coal seam mining in the underground coal seam mining area. The cutting method determination module is used to select the overburden cutting method based on the overburden strength. The overburden cutting method includes a vertical cutting method and an oblique cutting method. When the overburden strength falls within the soft rock range, the overburden cutting method is determined to be a vertical cutting method. When the overburden strength falls within the hard rock range, the overburden cutting method is determined to be an oblique cutting method. The size calculation module is used to obtain the overburden cutting parameters based on the overburden cutting method, and to calculate the size of the protective coal pillar after the overburden cutting is implemented according to the coal seam burial depth, the surface movement angle and the overburden cutting parameters. The construction module is used to perform overburden cutting construction according to the size of the protective coal pillar, so as to control the range of overburden movement.

[0007] According to another aspect of this application, a storage medium is provided that stores a computer program thereon, which, when executed by a processor, implements the above-described method for controlling the movement range of overburden in coal seam mining.

[0008] According to another aspect of this application, a computer device is provided, including a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, wherein the processor executes the program to implement the above-described method for controlling the movement range of overburden in coal seam mining.

[0009] By employing the above technical solutions, this application provides a method and system for controlling the movement range of overburden in coal seam mining, a storage medium, and computer equipment. Based on the differences in overburden strength, it selectively chooses vertical or oblique overburden cutting methods. Through active construction, it forms a weakened isolation zone in the overburden, blocking the transmission path of rock movement caused by mining to the surface protection area. Thus, while ensuring the safety of surface facilities, it can significantly reduce the size of the protective coal pillars required, free up a large amount of existing overburden resources, and improve the coal resource recovery rate.

[0010] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0011] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 A flowchart illustrating a method for controlling the movement range of overburden in coal seam mining, as provided in an embodiment of this application, is shown. Figure 2 This illustration shows a schematic diagram of the surface movement range in coal seam mining under a conventional method, as provided in an embodiment of this application. Figure 3 This illustration shows a schematic diagram of the protective coal pillar dimensions when the overburden cutting method is a vertical cutting method, as provided in an embodiment of this application. Figure 4 This illustration shows a schematic diagram of the protective coal pillar dimensions when the overburden cutting method is an oblique cutting method, as provided in an embodiment of this application. Figure 5 This illustration shows a comparison diagram of oblique and vertical cutting of coal seam overburden provided in an embodiment of this application; Figure 6 This paper shows a schematic diagram of the structure of a coal seam mining overburden movement range control system provided in an embodiment of this application; Figure 7 A schematic diagram of the device structure of a computer device provided in an embodiment of this application is shown. Detailed Implementation

[0012] The present application will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present application can be combined with each other.

[0013] This embodiment provides a method for controlling the movement range of overburden in coal seam mining, such as... Figure 1 As shown, the method includes: Step 101: Determine the surface target area to be protected and its corresponding underground coal seam mining area, and obtain the coal seam burial depth, overburden strength, and surface movement angle corresponding to the overburden movement caused by coal seam mining in the underground coal seam mining area.

[0014] Step 102: Select the overburden cutting method based on the overburden strength. The overburden cutting method includes vertical cutting and oblique cutting. When the overburden strength falls within the soft rock range, the overburden cutting method is determined to be vertical cutting. When the overburden strength falls within the hard rock range, the overburden cutting method is determined to be oblique cutting.

[0015] Step 103: Based on the overburden cutting method, obtain the overburden cutting parameters, and calculate the size of the protective coal pillar after the overburden cutting is implemented according to the coal seam burial depth, the surface movement angle, and the overburden cutting parameters.

[0016] Step 104: Perform overburden cutting construction according to the size of the protective coal pillar to control the range of overburden movement.

[0017] This application provides a method for controlling the range of overburden movement in coal seam mining. First, the target surface area to be protected, such as a group of buildings or transportation routes, is determined, and the corresponding coal seam mining area below it is delineated. Next, three key parameters can be obtained: coal seam burial depth (i.e., the vertical distance from the surface to the coal seam), overburden strength (referring to the overall hardness and firmness of the rock strata above the coal seam up to the surface), and surface movement angle (specifically an empirical parameter used to describe the acute angle between the boundary of surface subsidence caused by mining and the horizontal line when it extends from the edge of the goaf to the surface, defining the natural diffusion trend of the influence range of surface movement).

[0018] Furthermore, based on the obtained overburden strength, differentiated overburden cutting methods are selected. Overburden cutting refers to the creation of weakened isolation zones within the overburden through artificial engineering techniques. When the overburden is soft rock, its self-stabilizing ability is poor, making vertical cutting, which directly disturbs the rock mass and is simple to execute, suitable. When the overburden is hard rock, its overall strength is high, and the rock mass's own bearing capacity can be utilized; therefore, oblique cutting, which significantly reduces engineering work, is adopted, achieving the cutting objective through an inclined weakened zone. Here, the range of soft rock and hard rock can be determined according to actual needs.

[0019] Once the overburden cutting method is selected, specific overburden cutting parameters (such as the cutting depth for vertical cutting, or the cutting depth and inclination angle for oblique cutting) can be obtained, and core calculations can be performed accordingly. Specifically, the coal seam depth, surface movement angle, and overburden cutting parameters can be substituted into a preset calculation formula to accurately calculate the size of the protective coal pillar required after active cutting. In this way, a new starting point can be created within the rock strata through active cutting, thereby significantly reducing the traditional protective coal pillar range defined by extrapolating from the surface to the coal seam based solely on the natural diffusion angle (surface movement angle).

[0020] Finally, based on the calculated and reduced dimensions of the protective coal pillar, the on-site overburden cutting operation is guided. That is, underground, along the boundary of the new coal pillar closer to the mining area, the cutting operation is carried out according to predetermined methods and parameters (such as drilling, blasting, or fracturing), thereby physically constructing an isolation barrier and actively limiting the movement and deformation of the overburden caused by mining within a preset range, thus controlling the range of overburden movement and ensuring the safety of the target area on the surface.

[0021] By applying the technical solution of this embodiment, vertical or oblique overburden cutting methods are selected according to the differences in overburden strength. Through active construction, a weakened isolation zone is formed in the overburden, blocking the transmission path of rock strata movement caused by mining to the surface protection area. This significantly reduces the size of the protective coal pillars required while ensuring the safety of surface facilities, freeing up a large amount of existing overburden resources and improving the coal resource recovery rate.

[0022] In this embodiment of the application, optionally, when the overburden cutting method is a vertical cutting method, the overburden cutting parameters include a first cutting depth; the step of calculating the size of the protective coal pillar after overburden cutting based on the coal seam burial depth, the surface movement angle, and the overburden cutting parameters includes: The size of the protective coal pillar is calculated based on the following formula: ; Wherein, d1 is the size of the protective coal pillar, H is the burial depth of the coal seam, and h1 is the first cutting depth. The surface movement angle; When the overburden cutting method is an oblique cutting method, the overburden cutting parameters include a second cutting depth and a cutting inclination angle; the calculation of the protective coal pillar size after overburden cutting based on the coal seam burial depth, the surface movement angle, and the overburden cutting parameters includes: The size of the protective coal pillar is calculated based on the following formula: ; Wherein, d2 is the size of the protective coal pillar, and h2 is the second cutting depth. The cutting angle is [value].

[0023] In this embodiment, such as Figure 2 The diagram shows the surface movement range of coal seams under traditional mining methods. Here, H represents the coal seam depth, and D represents the calculated size of the protective coal pillar. It represents the angle of movement of the Earth's surface.

[0024] like Figure 3 The diagram shows the dimensions of the protective coal pillar when the overburden cutting method is vertical. In this case, the greater the depth of the vertical cut, the smaller the protective coal pillar size; consequently, the workload and cost of overburden cutting increase. (Compared to normal protective coal pillar dimensions...) Compared to the vertical cutting method, the reduction in protective coal pillars is... .

[0025] like Figure 4The diagram shows the dimensions of a protective coal pillar when the overburden cutting method is an oblique cutting method. When the overburden strength is high, a high-strength overburden cantilever structure can be used, and an oblique cutting method can be selected, which can significantly reduce the cutting depth, workload, and cost. Furthermore, the higher the overburden strength, the smaller the cutting angle can be, thus allowing for a further reduction in the protective coal pillar size while maintaining the same cutting workload. (Compared to the normal protective coal pillar size...) Compared to the oblique cutting method, the size of the protective coal pillar is reduced by [amount missing]. .

[0026] like Figure 5 As shown, a schematic diagram comparing oblique and vertical cutting of coal seam overburden is presented.

[0027] It should be noted that the above-mentioned overburden cutting parameters can be determined manually based on experience or derived from theoretical calculations, and no limitation is made here.

[0028] In this embodiment of the application, optionally, after step 103, the method further includes: determining the overburden cutting input corresponding to the implementation of overburden cutting, and the profit from recovering more coal resources, and calculating the difference between the profit and the overburden cutting input; if the difference meets the preset cutting implementation conditions, then the step of performing overburden cutting construction according to the size of the protective coal pillar is executed.

[0029] In this embodiment, after calculating the size of the protective coal pillar, it is possible to further verify whether the implementation of this scheme is necessary. Specifically, the verification involves two aspects: first, the investment in overburden cutting, which refers to all engineering costs required to construct the overburden weakening isolation zone, including the direct costs of drilling, charging, blasting, or fracturing operations; second, the profit from the recovery of additional coal resources, which comes from the market value of the additional coal resources that can be mined after reducing the size of the protective coal pillar through active cutting technology. Subtracting the calculated profit from the overburden cutting investment yields the estimated net economic benefit, which is the basis for judging the economic feasibility of the project.

[0030] Subsequently, the calculated difference is compared with the preset cutting implementation conditions. Here, the preset cutting implementation conditions can be an economic threshold, such as requiring the estimated net economic benefit to be greater than zero (i.e., the profit to exceed the overburden cutting investment), or it can be meeting a certain minimum return on investment standard. Only when the difference calculated in the previous step meets the preset cutting implementation conditions can the actual overburden cutting construction stage proceed.

[0031] This application's embodiments construct a closed-loop logic of "technical calculation - economic assessment - decision execution," realizing the improvement from qualitative experience judgment to quantitative decision-making. This optimizes the coal resource recovery rate and significantly improves the reliability of coal seam mining while ensuring the safety of the target area on the surface.

[0032] In this embodiment of the application, optionally, when the overburden cutting method is a vertical cutting method, the overburden cutting input is calculated based on the following formula: ; Wherein, Q1 is the input for overburden cutting, C1 is the unit cutting cost of vertical cutting, and F1 is the strike length or designed cutting width of the underground coal seam mining area. The profit from recovering additional coal resources is calculated based on the following formula: ; Where P1 is the profit and E is the unit price of coal.

[0033] In this embodiment, .

[0034] In this embodiment of the application, optionally, when the overburden cutting method is an oblique cutting method, the overburden cutting input is calculated based on the following formula: ; Wherein, Q2 is the input for overburden cutting, C2 is the unit cutting cost of the oblique cutting method, and F2 is the strike length or designed cutting width of the underground coal seam mining area; The profit from recovering additional coal resources is calculated based on the following formula: ; Where P2 is the profit and E is the unit price of coal.

[0035] In this embodiment, .

[0036] Optionally, in this embodiment of the application, step 103, "obtaining overburden cutting parameters based on the overburden cutting method," includes: Based on the overburden cutting method, the overburden cutting index is determined; the current value and feasible value range of the overburden cutting index, as well as the iteration optimization step size, are initialized; according to the current value of the overburden cutting index in the current iteration round, the overburden cutting input for the current value and the profit generated by the additional coal resources recovered due to the reduction in coal pillar size are calculated respectively; based on the objective function, the difference between the profit and the overburden cutting input is calculated; if the difference is greater than zero and is the largest among the iterated schemes, and through numerical simulation verification, the predicted movement deformation value of the surface target area under the current value of the overburden cutting index is less than the preset safety threshold, then the current value of the overburden cutting index is determined to be the optimal overburden cutting parameter, and output; otherwise, the current value of the overburden cutting index is updated according to the iteration optimization step size, and the process returns to the step of calculating the overburden cutting input for the current value and the profit generated by the additional coal resources recovered due to the reduction in coal pillar size based on the current value of the overburden cutting index in the current iteration round, until the iteration termination condition is met.

[0037] In this embodiment, the overburden cutting parameters can be obtained through theoretical calculations. First, the overburden cutting indices to be optimized are defined. For vertical cutting, the overburden cutting index is the cutting depth, which determines the vertical height of the weakened isolation zone; for oblique cutting, the overburden cutting index includes not only the cutting depth but also the cutting angle, which defines the tilt direction of the weakened zone. Determining these overburden cutting indices transforms the engineering problem into a mathematical single-parameter or multi-parameter optimization problem.

[0038] Next, a search starting point and boundary are set for these overburden cutting indicators. Specifically, a reasonable initial value can be assigned to each overburden cutting indicator as the current value. At the same time, the feasible value range of each overburden cutting indicator is defined (for example, the cutting depth cannot exceed the coal seam burial depth), and the iterative optimization step size is set, that is, the amount of change in the parameter value each time.

[0039] In each specific iterative calculation, a precise simulation can be performed based on the current values ​​of various overburden cutting indicators for the current round. First, based on these current values, combined with factors such as coal seam depth and surface movement angle, the corresponding, reduced protective coal pillar size is calculated. Then, based on this protective coal pillar size, the required overburden cutting investment and the profit resulting from extracting more coal due to fewer coal pillars are calculated. Here, the calculation of the protective coal pillar size, overburden cutting investment, and profit can be based on the aforementioned formulas. The calculation methods differ between vertical and oblique cutting methods.

[0040] After obtaining the input and profit from overburden cutting, the overall merits of the current overburden cutting parameters can be quantitatively evaluated using an objective function. In a specific embodiment, the objective function can be the difference between the profit and the overburden cutting input, i.e., the net profit. If this net profit is greater than zero and is the largest among all tried overburden cutting parameters; and if, after independent numerical simulation verification, the predicted deformation of the target area on the surface is found to be lower than a preset safety threshold, then the current value of the overburden cutting index (i.e., the current overburden cutting parameters) is considered the optimal overburden cutting parameters and is output. Here, to ensure safety, the current overburden cutting parameters are verified through independent numerical simulation. This is a technique that uses computer models to simulate the movement and deformation of rock strata under given overburden cutting parameters to confirm whether the predicted deformation of the target area on the surface is lower than the preset safety threshold.

[0041] If the current value of the overburden shedding index fails to simultaneously meet the above two conditions, the current value of the overburden shedding index can be automatically updated according to the iterative optimization step size. Then, the calculation steps for overburden shedding input and profit are returned to begin a new round of evaluation. This cycle will continue until an optimal solution that satisfies all conditions is found, or the preset iteration termination condition is reached (such as reaching the maximum number of calculations or the solution being sufficiently stable), at which point it will automatically end.

[0042] Optionally, in this embodiment of the application, step 104 includes: From the boundary of the protective coal pillar near the underground coal seam mining area, multiple vertical or inclined boreholes are drilled along the coal seam strike at preset intervals. The final depth of each borehole is not less than the cutting depth in the overburden cutting parameters. When the overburden cutting method is oblique cutting, the inclination angle of the borehole matches the cutting inclination angle. Through the boreholes, pre-splitting blasting or high-pressure hydraulic fracturing is used to weaken the overburden, forming a continuous or quasi-continuous rock mass weakening zone for overburden cutting. During the cutting construction and subsequent coal seam mining, monitoring points are set up in the target area on the surface, and surface movement and deformation data are measured using monitoring equipment corresponding to the monitoring points. Based on the surface movement and deformation data and a preset safety threshold, overburden movement range control feedback data is generated.

[0043] In this embodiment, the construction starting point can first be selected at the boundary of the goaf near the underground coal seam mining area, based on the calculated and reduced protective coal pillar. A series of boreholes are then arranged at predetermined intervals along the coal seam strike (i.e., the direction of the coal seam's underground extension). These boreholes can be vertical (in the case of vertical cutting) or inclined (in the case of oblique cutting); their final depth must at least reach the cutting depth in the overburden cutting parameters to ensure the weakened zone is sufficiently high vertically. When using the oblique cutting method, the borehole's inclination angle needs to precisely match the cutting dip angle in the overburden cutting parameters, thereby ensuring that the spatial morphology of the underground weakened zone completely matches the theoretical model, laying the foundation for subsequent precise weakening.

[0044] After drilling is completed, active rock mass modification techniques are implemented through these boreholes. There are two core techniques: one is pre-splitting blasting, which involves placing and detonating explosives in the borehole to create and expand fractures in the rock using the explosive energy; the other is high-pressure hydraulic fracturing, which involves injecting high-pressure fluid into the borehole to open and extend natural or newly formed fractures in the rock strata using fluid pressure. Regardless of the technique used, the fundamental purpose is to systematically weaken the overburden in the target section, significantly reducing its overall strength and continuity. This artificially creates a continuous or quasi-continuous rock mass weakening zone within the rock strata, effectively blocking or absorbing rock movement and stress transmission from the goaf, thus achieving the functional goal of overburden shearing.

[0045] To ensure construction effectiveness and long-term safety, surface movement and deformation can be dynamically monitored during overburden cutting or subsequent coal seam mining. Specifically, monitoring points can be deployed in the target surface area requiring protection from the start of cutting until the subsequent coal seam is mined. Monitoring equipment such as total stations, GNSS receivers, or surveying robots can be installed to continuously and accurately measure surface movement and deformation data. This real-time deformation data can be compared and analyzed against preset safety thresholds allowed by the project. Based on this comparison, overburden movement range control feedback data can be generated. This data can be used to determine whether the cutting operation has achieved the expected results, provide early warnings of potential risks, and, when necessary, provide a basis for adjusting subsequent mining plans.

[0046] This application's embodiments ensure that the geometry of the weakened zone meets theoretical requirements through precise spatial positioning and drilling control; achieve controllable modification of rock mass properties through mature active weakening technology; and finally, place the construction effect within a dynamic verification and controllable range through a real-time monitoring and feedback mechanism throughout the entire cycle. This application's embodiments can greatly improve the reliability and safety of overburden cutting.

[0047] Furthermore, as Figure 1In its specific implementation, this application provides a control system for the movement range of overburden in coal seam mining, such as... Figure 6 As shown, the system includes: The data acquisition module is used to determine the surface target area to be protected and its corresponding underground coal seam mining area, and to acquire the coal seam burial depth, overburden strength and surface movement angle corresponding to the overburden movement caused by coal seam mining in the underground coal seam mining area. The cutting method determination module is used to select the overburden cutting method based on the overburden strength. The overburden cutting method includes a vertical cutting method and an oblique cutting method. When the overburden strength falls within the soft rock range, the overburden cutting method is determined to be a vertical cutting method. When the overburden strength falls within the hard rock range, the overburden cutting method is determined to be an oblique cutting method. The size calculation module is used to obtain the overburden cutting parameters based on the overburden cutting method, and to calculate the size of the protective coal pillar after the overburden cutting is implemented according to the coal seam burial depth, the surface movement angle and the overburden cutting parameters. The construction module is used to perform overburden cutting construction according to the size of the protective coal pillar, so as to control the range of overburden movement.

[0048] Optionally, when the overburden cutting method is vertical cutting, the overburden cutting parameters include a first cutting depth; the size calculation module is used for: The size of the protective coal pillar is calculated based on the following formula: ; Wherein, d1 is the size of the protective coal pillar, H is the burial depth of the coal seam, and h1 is the first cutting depth. The surface movement angle; When the overburden cutting method is oblique cutting, the overburden cutting parameters include the second cutting depth and the cutting inclination angle; the size calculation module is used for: The size of the protective coal pillar is calculated based on the following formula: ; Wherein, d2 is the size of the protective coal pillar, and h2 is the second cutting depth. The cutting angle is [value].

[0049] Optionally, the system further includes a verification module; the verification module is used for: After calculating the size of the protective coal pillar after the implementation of overburden cutting, the overburden cutting input corresponding to the implementation of overburden cutting, as well as the profit of recovering more coal resources, are determined, and the difference between the profit and the overburden cutting input is calculated. If the difference meets the preset cutting implementation conditions, then the step of performing overburden cutting construction according to the size of the protective coal pillar is executed.

[0050] Optionally, when the overburden cutting method is a vertical cutting method, the overburden cutting input is calculated based on the following formula: ; Wherein, Q1 is the input for overburden cutting, C1 is the unit cutting cost of vertical cutting, and F1 is the strike length or designed cutting width of the underground coal seam mining area. The profit from recovering additional coal resources is calculated based on the following formula: ; Where P1 is the profit and E is the unit price of coal.

[0051] Optionally, when the overburden cutting method is an oblique cutting method, the overburden cutting input is calculated based on the following formula: ; Wherein, Q2 is the input for overburden cutting, C2 is the unit cutting cost of the oblique cutting method, and F2 is the strike length or designed cutting width of the underground coal seam mining area; The profit from recovering additional coal resources is calculated based on the following formula: ; Where P2 is the profit and E is the unit price of coal.

[0052] Optionally, the size calculation module is further configured to: Based on the aforementioned overburden cutting method, the overburden cutting index is determined; Initialize the current value and feasible value range of the overburden shedding index, as well as the iterative optimization step size; Based on the current value of the overburden cutting index in the current iteration, calculate the overburden cutting input for the current value, as well as the profit generated by the additional coal resources recovered due to the reduction in coal pillar size. Based on the objective function, calculate the difference between the profit and the input of the overburden cutting; If the difference is greater than zero and is the largest among the iterative schemes, and numerical simulation verifies that the predicted movement deformation value of the surface target area is less than the preset safety threshold under the current value of the overburden cutting index, then the current value of the overburden cutting index is determined to be the optimal overburden cutting parameter and output; otherwise, the current value of the overburden cutting index is updated according to the iteration optimization step size, and the process returns to the step of calculating the overburden cutting input and the profit generated by the additional coal resources recovered due to the reduction in coal pillar size based on the current value of the overburden cutting index under the current iteration round, until the iteration termination condition is met.

[0053] Optionally, the construction module is used for: From the side boundary of the protective coal pillar near the underground coal seam mining area, multiple vertical or inclined boreholes are drilled along the coal seam strike at preset intervals. The final depth of the borehole is not less than the cutting depth in the overburden cutting parameters. When the overburden cutting method is oblique cutting, the inclination angle of the borehole matches the cutting inclination angle. Through the borehole, the overburden is weakened by pre-splitting blasting or high-pressure hydraulic fracturing to form a continuous or quasi-continuous rock mass weakening zone for overburden cutting. During the cutting operation and subsequent coal seam mining, monitoring points are set up in the target area on the surface, and surface movement and deformation data are measured by the monitoring equipment corresponding to the monitoring points. Based on the surface movement and deformation data and the preset safety threshold, overburden movement range control feedback data is generated.

[0054] It should be noted that other corresponding descriptions of the functional units involved in the coal seam mining overburden movement range control system provided in this application embodiment can be found in the following references. Figures 1 to 5 The corresponding descriptions in the method will not be repeated here.

[0055] This application also provides a computer device, which may specifically be a personal computer, a server, a network device, etc. Figure 7 As shown, the computer device includes a bus, a processor, memory, and a communication interface, and may also include an input / output interface and a display device. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The database stores location information. The network interface allows communication with external terminals via a network connection. When the computer program is executed by the processor, it implements the steps in the various method embodiments.

[0056] Those skilled in the art will understand that Figure 7 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0057] In one embodiment, a computer-readable storage medium is provided, which may be non-volatile or volatile, having stored thereon a computer program that, when executed by a processor, implements the steps in the above method embodiments.

[0058] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in the above method embodiments.

[0059] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0060] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0061] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for controlling the movement range of overburden in coal seam mining, characterized in that, include: The surface target area to be protected and its corresponding underground coal seam mining area are determined, and the coal seam burial depth, overburden strength, and surface movement angle corresponding to the overburden movement caused by coal seam mining are obtained for the underground coal seam mining area. The overburden cutting method is selected based on the overburden strength, wherein the overburden cutting method includes vertical cutting and oblique cutting. When the overburden strength falls within the soft rock range, the overburden cutting method is determined to be vertical cutting. When the overburden strength falls within the hard rock range, the overburden cutting method is determined to be oblique cutting. Based on the overburden cutting method, the overburden cutting parameters are obtained, and the size of the protective coal pillar after the overburden cutting is calculated according to the coal seam burial depth, the surface movement angle and the overburden cutting parameters. Based on the dimensions of the protective coal pillar, overburden cutting operations are performed to control the range of overburden movement; When the overburden cutting method is vertical cutting, the overburden cutting parameters include a first cutting depth; calculating the protective coal pillar size after overburden cutting based on the coal seam depth, the surface movement angle, and the overburden cutting parameters includes: The size of the protective coal pillar is calculated based on the following formula: ； Wherein, d1 is the size of the protective coal pillar, H is the burial depth of the coal seam, and h1 is the first cutting depth. The surface movement angle; When the overburden cutting method is an oblique cutting method, the overburden cutting parameters include a second cutting depth and a cutting inclination angle; the calculation of the protective coal pillar size after overburden cutting based on the coal seam burial depth, the surface movement angle, and the overburden cutting parameters includes: The size of the protective coal pillar is calculated based on the following formula: ； Wherein, d2 is the size of the protective coal pillar, and h2 is the second cutting depth. The cutting angle; After calculating the size of the protective coal pillar after overburden cutting, the method further includes: Determine the overburden cutting input corresponding to the implementation of overburden cutting, as well as the profit from recovering more coal resources, and calculate the difference between the profit and the overburden cutting input; If the difference meets the preset cutting implementation conditions, then the step of performing overburden cutting construction according to the size of the protective coal pillar is executed; The process of obtaining overburden cutting parameters based on the overburden cutting method includes: Based on the aforementioned overburden cutting method, the overburden cutting index is determined; Initialize the current value and feasible value range of the overburden shedding index, as well as the iterative optimization step size; Based on the current value of the overburden cutting index in the current iteration, calculate the overburden cutting input for the current value, as well as the profit generated by the additional coal resources recovered due to the reduction in coal pillar size. Based on the objective function, calculate the difference between the profit and the input of the overburden cutting; If the difference is greater than zero and is the largest among the iterative schemes, and numerical simulation verifies that the predicted movement deformation value of the surface target area is less than the preset safety threshold under the current value of the overburden cutting index, then the current value of the overburden cutting index is determined to be the optimal overburden cutting parameter and output; otherwise, the current value of the overburden cutting index is updated according to the iteration optimization step size, and the process returns to the step of calculating the overburden cutting input and the profit generated by the additional coal resources recovered due to the reduction in coal pillar size based on the current value of the overburden cutting index under the current iteration round, until the iteration termination condition is met.

2. The method according to claim 1, characterized in that, When the overburden cutting method is vertical cutting, the overburden cutting input is calculated based on the following formula: ； Wherein, Q1 is the input for overburden cutting, C1 is the unit cutting cost of vertical cutting, and F1 is the strike length or designed cutting width of the underground coal seam mining area. The profit from recovering additional coal resources is calculated based on the following formula: ； Where P1 is the profit and E is the unit price of coal.

3. The method according to claim 1, characterized in that, When the overburden cutting method is an oblique cutting method, the overburden cutting input is calculated based on the following formula: ； Wherein, Q2 is the input for overburden cutting, C2 is the unit cutting cost of the oblique cutting method, and F2 is the strike length or designed cutting width of the underground coal seam mining area; The profit from recovering additional coal resources is calculated based on the following formula: ； Where P2 is the profit and E is the unit price of coal.

4. The method according to claim 1, characterized in that, The process of cutting off the overburden according to the size of the protective coal pillar includes: From the side boundary of the protective coal pillar near the underground coal seam mining area, multiple vertical or inclined boreholes are drilled along the coal seam strike at preset intervals. The final depth of the borehole is not less than the cutting depth in the overburden cutting parameters. When the overburden cutting method is oblique cutting, the inclination angle of the borehole matches the cutting inclination angle. Through the borehole, the overburden is weakened by pre-splitting blasting or high-pressure hydraulic fracturing to form a continuous or quasi-continuous rock mass weakening zone for overburden cutting. During the cutting operation and subsequent coal seam mining, monitoring points are set up in the target area on the surface, and surface movement and deformation data are measured by the monitoring equipment corresponding to the monitoring points. Based on the surface movement and deformation data and the preset safety threshold, overburden movement range control feedback data is generated.

5. A control system for the movement range of overburden in coal seam mining, characterized in that, include: The data acquisition module is used to determine the surface target area to be protected and its corresponding underground coal seam mining area, and to acquire the coal seam burial depth, overburden strength and surface movement angle corresponding to the overburden movement caused by coal seam mining in the underground coal seam mining area. The cutting method determination module is used to select the overburden cutting method based on the overburden strength. The overburden cutting method includes a vertical cutting method and an oblique cutting method. When the overburden strength falls within the soft rock range, the overburden cutting method is determined to be a vertical cutting method. When the overburden strength falls within the hard rock range, the overburden cutting method is determined to be an oblique cutting method. The size calculation module is used to obtain the overburden cutting parameters based on the overburden cutting method, and to calculate the size of the protective coal pillar after the overburden cutting is implemented according to the coal seam burial depth, the surface movement angle and the overburden cutting parameters. The construction module is used to perform overburden cutting construction according to the size of the protective coal pillar, so as to control the range of overburden movement; When the overburden cutting method is vertical cutting, the overburden cutting parameters include a first cutting depth; the size calculation module is used for: The size of the protective coal pillar is calculated based on the following formula: ； Wherein, d1 is the size of the protective coal pillar, H is the burial depth of the coal seam, and h1 is the first cutting depth. The surface movement angle; When the overburden cutting method is oblique cutting, the overburden cutting parameters include the second cutting depth and the cutting inclination angle; the size calculation module is used for: The size of the protective coal pillar is calculated based on the following formula: ； Wherein, d2 is the size of the protective coal pillar, and h2 is the second cutting depth. The cutting angle; The system further includes a verification module; the verification module is used for: After calculating the size of the protective coal pillar after the implementation of overburden cutting, the overburden cutting input corresponding to the implementation of overburden cutting, as well as the profit of recovering more coal resources, are determined, and the difference between the profit and the overburden cutting input is calculated. If the difference meets the preset cutting implementation conditions, then the step of performing overburden cutting construction according to the size of the protective coal pillar is executed; The size calculation module is also used for: Based on the aforementioned overburden cutting method, the overburden cutting index is determined; Initialize the current value and feasible value range of the overburden shedding index, as well as the iterative optimization step size; Based on the current value of the overburden cutting index in the current iteration, calculate the overburden cutting input for the current value, as well as the profit generated by the additional coal resources recovered due to the reduction in coal pillar size. Based on the objective function, calculate the difference between the profit and the input of the overburden cutting; If the difference is greater than zero and is the largest among the iterative schemes, and numerical simulation verifies that the predicted movement deformation value of the surface target area is less than the preset safety threshold under the current value of the overburden cutting index, then the current value of the overburden cutting index is determined to be the optimal overburden cutting parameter and output; otherwise, the current value of the overburden cutting index is updated according to the iteration optimization step size, and the process returns to the step of calculating the overburden cutting input and the profit generated by the additional coal resources recovered due to the reduction in coal pillar size based on the current value of the overburden cutting index under the current iteration round, until the iteration termination condition is met.

6. A storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method of any one of claims 1 to 4.

7. A computer device, comprising a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method of any one of claims 1 to 4.

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