Limit working face length determination method and equipment

Abstract

The invention discloses a limit working face length determination method and equipment, and the method comprises the steps: calculating a mining coefficient, and judging a mining state according to the mining coefficient; when the mining state is the full mining state and the super-full mining state, the maximum surface subsidence is obtained, and the basin diameter is calculated according to the maximum surface subsidence; and the actual working face length is obtained, and the limit working face length is calculated according to the actual working face length and the basin diameter. Due to the fact that high yield and high efficiency are not facilitated in the insufficient state, the diameter of the basin is calculated in the sufficient and super-sufficient mining states, the size boundary of uniform settlement and continuous deformation of the mining earth surface can be calculated, the earth surface ecological restoration cost is reduced, and the source loss reduction effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mines, and in particular to a method for determining the length of an extreme working face, an electronic device, a storage medium and a computer program product. BACKGROUND

[0002] Green mining is the basic color of high-quality coal mining, and source damage is the most basic link. The optimization of actual working face length is the most active operation. How to control the actual working face length and optimize the surface subsidence form and irreversible damage ratio is particularly important. The actual working face length directly measures whether the surface can reach the full mining degree in the strike or tendency, while the extreme working face length is the state where the surface subsidence just reaches the extreme value and no longer increases with the length. The optimization of the actual working face length is based on the comparison with the extreme working face length.

[0003] The existing technology mainly uses the following methods to determine the length of the extreme working face:

[0004] Empirical method: determine the length of the extreme working face according to past experience. This method may have different limitations due to regional differences and changes in geological conditions.

[0005] Calculation method: determine the length of the extreme working face through mathematical models and calculation formulas. This method needs to be calculated based on specific parameters and conditions, such as working face mining parameters, buried depth, loose layer thickness, etc., and the calculation result is not accurate.

[0006] Experimental method: determine the size of the extreme working face through experimental testing. This method requires experimental equipment and site, and needs enough time and resources for testing and analysis.

[0007] Simulation method: simulate the operation of the working face through computer simulation software and determine the size of the extreme working face. This method requires the use of professional simulation software and requires sufficient layer parameters and computer programming and simulation analysis capabilities.

[0008] Therefore, the existing technology lacks an effective and low-cost method for determining the length of the extreme working face. SUMMARY

[0009] Therefore, it is necessary to provide a method for determining the length of the extreme working face, an electronic device, a storage medium and a computer program product to solve the technical problems of the lack of existing technology for determining the length of the extreme working face and high monitoring cost.

[0010] The present application provides a method for determining the length of an extreme working face, comprising:

[0011] Calculate the mining coefficient, and determine the mining state according to the mining coefficient;

[0012] obtaining a maximum surface subsidence when the mining state is a full and super full mining state, and calculating a basin diameter according to the maximum surface subsidence;

[0013] obtaining an actual working face length, and calculating a limit working face length according to the actual working face length and the basin diameter.

[0014] Further, the mining state is determined according to the mining coefficient, and the method comprises:

[0015] obtaining a buried depth, and calculating a mining coefficient threshold value based on the buried depth;

[0016] If the mining coefficient is greater than or equal to the mining coefficient threshold value, the mining state is a full and super full mining state, otherwise, the mining state is determined as an insufficient mining state.

[0017] Further, the mining coefficient threshold value is calculated based on the buried depth, and the method comprises:

[0018] If the buried depth is greater than or equal to a preset buried depth threshold value, an initial limit working face length is calculated as L' = A + H / π, wherein L' is the initial limit working face length, H is the buried depth, and A is a first constant;

[0019] If the buried depth is less than the preset buried depth threshold value, the initial limit working face length is calculated as L' = (B-H / C)*H, wherein B is a second constant, and C is a third constant;

[0020] The mining coefficient threshold value is calculated as a mining coefficient corresponding to the initial limit working face length.

[0021] Further, the basin diameter is calculated according to the maximum surface subsidence, and the method comprises:

[0022] The basin boundary subsidence is calculated according to the maximum surface subsidence and a basin boundary coefficient;

[0023] The basin diameter is calculated according to the basin boundary subsidence.

[0024] Further, the basin diameter is calculated according to the basin boundary subsidence, and the method comprises:

[0025] Two boundary positions of the basin boundary where the basin boundary subsidence is located are determined;

[0026] The distance between the two boundary positions is obtained as the basin diameter.

[0027] Further, the basin boundary subsidence is calculated according to the maximum surface subsidence and a basin boundary coefficient, and the method comprises:

[0028] The basin boundary subsidence is calculated as w=k*W, wherein w is the basin boundary subsidence, k is the basin boundary coefficient, and W is the maximum surface subsidence.

[0029] Further, the limit working face length is calculated according to the actual working face length and the basin diameter, and the limit working face length calculation comprises:

[0030] The limit working face length is calculated as L=D-R, wherein L is the limit working face length, D is the actual working face length, and R is the basin diameter.

[0031] Further, the limit working face length is calculated according to the actual working face length and the basin diameter, and the limit working face length calculation comprises:

[0032] The impairment rate is calculated according to the actual working face length and the limit working face length as wherein D is the actual working face length, and L is the limit working face length.

[0033] The present application provides an electronic device, comprising:

[0034] at least one processor; and,

[0035] a memory in communication with the at least one processor; wherein,

[0036] The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the limit working face length determination method as described above.

[0037] The present application provides a storage medium storing computer instructions for performing all steps of the limit working face length determination method as described above when the computer executes the computer instructions.

[0038] The present application provides a computer program product comprising computer programs / instructions for implementing the limit working face length determination method as described above when executed by a processor.

[0039] The present application calculates the mining coefficient, judges the mining state according to the mining coefficient, and then calculates the basin diameter according to the maximum surface subsidence when the mining state is sufficient and super sufficient mining state, and calculates the limit working face length according to the actual working face length and the basin diameter. The present application can calculate the uniform subsidence and continuous deformation size boundary of the mining surface, obtain the accurate limit working face length, and reduce the overall calculation cost due to the low monitoring cost of the maximum surface subsidence. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1This is a flowchart illustrating a method for determining the length of a limiting working surface according to an embodiment of the present invention.

[0041] Figure 2 This is a flowchart illustrating a method for determining the length of a limiting working surface according to another embodiment of the present invention.

[0042] Figure 3 This is a cross-sectional view of a working surface in one example of the present invention;

[0043] Figure 4 This is a schematic diagram of the limiting working face length mining coefficient as an example of the present invention.

[0044] Figure 5 This is a schematic diagram illustrating the optimization of the working surface length as an example of the present invention;

[0045] Figure 6 This is a schematic diagram of the hardware structure of an electronic device according to the present invention. Detailed Implementation

[0046] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0047] like Figure 1 The diagram shown is a flowchart of a method for determining the length of a limiting working surface according to an embodiment of the present invention, including:

[0048] Step S101: Calculate the mining activation coefficient and determine the mining status based on the mining activation coefficient;

[0049] Step S102: When the mining state is fully or over-fully mined, obtain the maximum surface subsidence and calculate the basin diameter based on the maximum surface subsidence;

[0050] Step S103: Obtain the actual working face length, and calculate the limit working face length based on the actual working face length and the basin diameter.

[0051] Specifically, this invention can be applied to electronic devices with processing capabilities, such as host computers.

[0052] For mining-induced surface subsidence, the mining factor is a coefficient that measures whether the surface can be sufficiently mined along its strike and dip. The mining factor is linearly related to the actual working face length and can be adjusted by changing the working face length. A longer working face results in a larger mining factor, more complete surface subsidence, a larger subsidence basin area, a higher proportion of uniform subsidence, and a lower proportion of irreversible damage. Conversely, a shorter working face results in a smaller mining factor, a weaker impact on surface subsidence, and less impact on surface damage. Simply put, both longer and shorter working faces are beneficial for reducing surface damage. Therefore, defining the limiting working face length and adopting an optimized path for loss reduction that deviates from this limit is crucial. Optimized path loss reduction involves using an optimization strategy that deviates from the limiting working face length, either optimizing towards a length greater than or less than the limiting working face length.

[0053] First, execute step S101 to calculate the mining activation coefficient and determine the mining status based on the mining activation coefficient.

[0054] Specifically, the existing method for calculating the mining-induced coefficient can be used to determine the mining-induced coefficient. For example, the mining-induced coefficient can be calculated as: actual working face length / burial depth.

[0055] Then, step S102 is executed: when the mining state is fully or over-fully mined, the maximum surface subsidence is obtained, and the basin diameter is calculated based on the maximum surface subsidence.

[0056] Mining conditions include: weak mining impact state, mining impact state, and fully and over-fully mined states. In the fully and over-fully mined states, the basin diameter is calculated based on the maximum surface subsidence. The basin in this context refers to a surface subsidence basin.

[0057] Finally, step S103 is executed to obtain the actual working face length, and the limit working face length is calculated based on the actual working face length and the basin diameter.

[0058] The ultimate working face length represents the state where surface subsidence reaches its extreme and no longer increases with length. In the case of insufficient mining, surface subsidence exhibits a V-shaped distribution; the shorter the working face, the smaller the peak value of V, making shortening the working face length the optimal path to reduce damage. In the fully or excessively mined state, the surface subsidence transforms from a V-shape to a U-shape, increasing the working face length while maintaining the same peak subsidence, although the basin width increases, indicating an optimal state for damage reduction. Therefore, when the ultimate working face length is reached, discontinuous surface deformation and irreversible damage reach their extreme values, exhibiting a V-shaped distribution. Increasing or shortening the actual working face length both fall under the optimal damage reduction state. Thus, the ultimate working face length remains constant, a fixed value. After determining the ultimate working face length, the actual working face length can be compared with the ultimate working face length, and the actual working face length can be adjusted based on the ultimate working face length to obtain the optimal actual working face length.

[0059] This invention calculates the mining-induced coefficient and determines the mining state based on it. Then, in both fully and over-fully mined states, it calculates the basin diameter based on the maximum surface subsidence and the ultimate working face length based on the actual working face length and the basin diameter. This invention calculates the basin diameter in both fully and over-fully mined states, enabling the calculation of uniform surface subsidence and continuous deformation boundary dimensions, thus obtaining an accurate ultimate working face length. Furthermore, the monitoring cost of maximum surface subsidence is low, thereby reducing the overall computational cost.

[0060] like Figure 2 The diagram shown is a flowchart of a method for determining the length of a limiting working surface according to another embodiment of the present invention, including:

[0061] Step S201: Calculate the mining coefficient.

[0062] Step S202: Obtain the burial depth and calculate the mining coefficient threshold based on the burial depth.

[0063] In one embodiment, calculating the mining coefficient threshold based on burial depth includes:

[0064] If the burial depth is greater than or equal to the preset burial depth threshold, the initial limit working face length is calculated as L' = A + H / π, where L' is the initial limit working face length, H is the burial depth, and A is the first constant.

[0065] If the burial depth is less than the preset burial depth threshold, the initial limit working face length is calculated as L' = BH / C, where B is the second constant and C is the third constant.

[0066] The threshold for the mining factor is the mining factor corresponding to the initial limit working face length.

[0067] Step S203: If the mining coefficient is greater than or equal to the mining coefficient threshold, the mining state is a fully or over-fully mined state; otherwise, it is judged as an under-mined state.

[0068] Step S204: When the mining state is fully mined or over-fully mined, obtain the maximum surface subsidence.

[0069] Step S205: Calculate the basin boundary settlement based on the maximum surface subsidence and the basin boundary coefficient.

[0070] In one embodiment, basin boundary settlement is calculated based on the maximum surface subsidence and the basin boundary coefficient, including:

[0071] The basin boundary settlement is calculated as: w = k × W, where w is the basin boundary settlement, k is the basin boundary coefficient, and W is the maximum surface subsidence.

[0072] Step S206: Determine the two boundary positions of the basin boundary subsidence in the basin boundary, and obtain the distance between the two boundary positions as the basin diameter.

[0073] Step S207, calculate the limit working face length as: L = DR, where L is the limit working face length, D is the actual working face length, and R is the basin diameter.

[0074] Step S208: Calculate the loss reduction rate based on the actual working face length and the limiting working face length. Where D is the actual working face length and L is the limit working face length.

[0075] Specifically, for clarity, the following parameters are mainly used: the limit working face length L, the actual working face length D, the burial depth H, the maximum surface subsidence W, the surface settlement w, the subsidence coefficient λ, the mining coefficient n, the basin boundary coefficient k, and the basin diameter R.

[0076] First, execute step S201 to calculate the mining coefficient.

[0077] The mining-induced coefficient is calculated using existing mining-induced coefficient calculation methods.

[0078] Then, step S202 is executed to obtain the burial depth, and based on the burial depth, the mining coefficient threshold is calculated.

[0079] In one embodiment, calculating the mining coefficient threshold based on burial depth includes:

[0080] If the burial depth is greater than or equal to the preset burial depth threshold, the initial limit working face length is calculated as L' = A + H / π, where L' is the initial limit working face length, H is the burial depth, and A is the first constant.

[0081] If the burial depth is less than the preset burial depth threshold, the initial limit working face length is calculated as L'=(BH / C)*H, where B is the second constant and C is the third constant;

[0082] The threshold for the mining factor is the mining factor corresponding to the initial limit working face length.

[0083] Specifically, the length L of the ultimate working face is directly related to the burial depth H. A rough ultimate working face length can be calculated first as the initial ultimate working face length to initially determine the mining status.

[0084] When the burial depth is greater than or equal to the preset burial depth threshold, the length of the limit working face and the burial depth are basically linearly increasing. The simplified formula is L'=A+H / π, where L' is the initial limit working face length, H is the burial depth, and A is the first constant.

[0085] Preferably, A is 90, and the formula simplifies to L' = 90 + H / π.

[0086] When the shallow to medium burial depth is less than the preset burial depth threshold, the length of the limiting working face and the burial depth H have a linear decreasing relationship, and the formula is L'=(BH / C)*H, where B is the second constant and C is the third constant.

[0087] Preferably, B is 1.3 and C is 500, and the formula is simplified to L'=(1.3-H / 500)*H.

[0088] The preferred preset burial depth threshold is 500 meters.

[0089] Then, the mining coefficient threshold is calculated as the mining coefficient corresponding to the initial limit working face length. The mining coefficient n corresponding to the limit working face length L no longer changes with the mining size. The mining coefficient corresponding to the initial limit working face length can be called the limit working face mining coefficient. When the burial depth is less than the preset burial depth threshold, the limit working face mining coefficient can be simplified to n' = BH / C, where n' is the limit working face mining coefficient.

[0090] The mining coefficient corresponding to the initial limit working face length is the initial limit working face length / burial depth.

[0091] like Figure 4 The figure shows the relationship between burial depth and the corresponding limit working face mining coefficient when the burial depth is less than 500m. Figure 4 The horizontal axis represents the burial depth, and the vertical axis represents the mining coefficient of the ultimate working face. Figure 4 This includes multiple measured mining coefficients 41 for the ultimate working face, and a fitted straight line 42 fitted based on the discrete points 41, with the fitted line being γ = 1.3 - H / 500. Here, γ is the mining coefficient for the ultimate working face, i.e., the mining coefficient corresponding to the initial length of the ultimate working face.

[0092] Then, step S203 is executed. If the mining coefficient is greater than or equal to the mining coefficient threshold, the mining state is either fully or over-fully mined; otherwise, it is judged as under-mined.

[0093] Specifically, the mining status is divided into insufficient mining status, sufficient mining status, and over-sufficient mining status.

[0094] If the mining coefficient calculated in step S201 is greater than or equal to the mining coefficient threshold, the mining status is either fully or over-fully mined. Otherwise, if the mining coefficient calculated in step S201 is less than the mining coefficient threshold, it is judged to be under-mined.

[0095] When the mining state is not fully mined, the initial limit working face length is directly output as the limit working face length.

[0096] For areas that are not fully exploited, it is recommended that the actual working face be optimized to be as short as possible.

[0097] When the mining status is fully or over-fully mined, step S204 is executed to obtain the maximum surface subsidence when the mining status is fully or over-fully mined.

[0098] After obtaining the maximum surface subsidence in step S204, step S205 is executed to calculate the basin boundary subsidence based on the maximum surface subsidence and the basin boundary coefficient.

[0099] Specifically, for fully and over-fully exploited conditions, it is appropriate to define a basin boundary coefficient k, with a value not less than 0.8. Then, based on the maximum surface subsidence and the basin boundary coefficient, the basin boundary settlement is calculated. A larger value for the basin boundary coefficient k indicates a smaller basin diameter and radius; a suitable value for the basin boundary coefficient is 0.8–0.95.

[0100] In one embodiment, basin boundary settlement is calculated based on the maximum surface subsidence and the basin boundary coefficient, including:

[0101] The basin boundary settlement is calculated as: w = k × W, where w is the basin boundary settlement, k is the basin boundary coefficient, and W is the maximum surface subsidence.

[0102] Specifically, the surface subsidence resembles a basin, with non-uniform subsidence on the actual sides, making it impossible to linearly define the boundary location. Therefore, a certain subsidence contour line is used to delineate the boundary range. Thus, the basin boundary subsidence w = k × W is calculated, and the basin radius r or diameter R is calculated based on this.

[0103] Then, step S206 is executed to calculate the basin diameter based on the basin boundary subsidence.

[0104] In one embodiment, calculating the basin diameter based on the basin boundary subsidence includes:

[0105] Determine the locations of the two boundaries of the basin boundary subsidence within the basin boundary.

[0106] Obtain the distance between the two boundary locations as the basin diameter.

[0107] Specifically, the locations of the two boundaries of the basin boundary subsidence are first determined within the basin boundary. For example... Figure 3 The diagram shows a cross-sectional view of a working face. The maximum surface subsidence W is 5.04m, therefore the basin boundary subsidence can be calculated to be 4.28m. Within the basin boundary 31, two boundary locations 311 and 312 at -4.28m are identified. The distance between these two boundary locations is then taken as the basin diameter. Figure 3 As shown, the distance between the two boundary positions 311 and 312 is obtained as the basin diameter R.

[0108] Then, step S207 is executed to calculate the limit working face length as: L = DR, where L is the limit working face length, D is the actual working face length, and R is the basin diameter.

[0109] Specifically, such as Figure 3 As shown, after determining the basin diameter R, L = DR is calculated, where L is the sum of lengths K1 and K2. K1 is the distance from the left boundary position 311 to the left end 321 of the working face 32, and K2 is the distance from the right boundary position 312 to the right end 322 of the working face 32. The two ends of the working face 32 are coal seams 33. The ultimate working face length is a fixed value; when the actual working face length changes, the basin boundary will also change, thus altering the basin diameter.

[0110] When the mining is in a fully or super-fully mined state, it is recommended to optimize the mining by increasing the length of the working face in order to achieve high production and efficiency. This would increase the range of uniform surface subsidence and continuous deformation caused by mining, reduce the cost of surface ecological restoration, and improve the source loss reduction effect.

[0111] Finally, step S208 is executed to calculate the reduction rate based on the actual working face length and the limit working face length. Where D is the actual working face length and L is the limit working face length.

[0112] Specifically, the loss reduction rate is calculated based on the actual working face length and the limiting working face length. The loss reduction rate is the ratio of uniform settlement to the actual working face length D, i.e. It is evident that the greater the difference between the actual working surface length D and the limit working surface length L, the better the loss reduction effect. After obtaining the loss reduction rate, if the loss reduction rate is lower than the preset loss reduction rate threshold, the actual working surface length is adjusted to reach the loss reduction rate threshold, and the actual working surface length that reaches the loss reduction rate threshold is taken as the optimal working surface length.

[0113] When the dip angle α of the coal seam is large, the actual working face length is replaced by D×cosα.

[0114] This embodiment determines the mining state by comparing the mining activity coefficient with a mining activity coefficient threshold. Under both fully and over-fully mined conditions, the ultimate working face length is calculated based on the basin diameter. According to numerous actual monitoring results, the calculation method in this embodiment is more convenient and realistic. Simultaneously, this embodiment calculates the loss reduction rate based on the actual working face length and the ultimate working face length, thereby obtaining the optimized actual working face length through the loss reduction rate. The loss reduction rate quantifies the loss reduction state of the working face length, providing a quantitative indicator for source loss reduction optimization capabilities or green mining evaluation.

[0115] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0116] As an example of this invention, taking the 12401 working face of Shangwan Coal Mine as an example, the working face has a mining height of 8.6m, a strike advance length of 5286m, a dip length D of 299.2m, a dip angle α of 1-5°, and a burial depth H of 210m. The dip length D is the actual working face length.

[0117] Since the burial depth H is 200m, based on the conventional calculation of H / 100 according to the measuring point interval distance, with a measuring point spacing of 20m, 38 monitoring points are arranged along the working face strike, and 43 monitoring points are arranged along the working face dip. Based on the mining dimensions, the strike mining activity coefficient can be preliminarily determined to be 5286m / 210m≈25, and the dip mining activity coefficient is 299.2m / 210m=1.43. Both size coefficients are greater than the empirical values ​​of 1.2~1.4, indicating that the mining state is either fully or over-fully mined.

[0118] like Figure 3 As shown, due to the small dip angle of the working face, the measured maximum subsidence point is located 150m from the center of working face 32, with a maximum subsidence value W of 5.04m and a subsidence coefficient λ of 0.59. The basin boundary coefficient k is chosen to be no less than 0.8, with a suitable value of 0.8 to 0.95. In this case, k is chosen to be 0.85 as the basin boundary coefficient, and the basin boundary settlement w = k × W = 0.85 × 5.04m = 4.28m. Within the basin boundary 31, two boundary positions 311 and 312 at -4.28m are identified. The distance between these two boundary positions 311 and 312 is then measured as the basin diameter R. In this example, the measured basin diameter R = 101.2m.

[0119] The length of K1 can be measured to be 100m, and the length of K2 to be 98m. K1 is the distance from the left boundary position 311 to the left end 321 of the working face 32, and K2 is the distance from the right boundary position 312 to the right end 322 of the working face 32. The two ends of the working face 32 are coal seams 33. Then, the ultimate working face length L is calculated as (K1 + K2) = 100m + 98m = 198m.

[0120] Alternatively, the ultimate working face length L can be calculated directly based on the actual working face length D and the basin diameter R: L = DR.

[0121] Because the inclination angle is relatively small (1-5°), the actual working face length remains unchanged.

[0122] According to the reduction rate, we know It can be seen that the working face length is under certain loss at this time, with a loss rate of about 34%, and its optimized loss coefficient curve is shown in Figure 51. Figure 5 As shown, loss reduction can be optimized by further increasing the working face length or shortening the working face to below 198m. From the results, shortening the working face length has a more obvious optimization effect, but it is not conducive to high production and high efficiency. Therefore, after comprehensive analysis of the optimization path, we can choose to increase the working face length so that the loss reduction rate reaches the preset loss reduction rate threshold.

[0123] like Figure 6 The diagram shown is a hardware structure schematic of an electronic device according to the present invention, comprising:

[0124] At least one processor 601; and,

[0125] A memory 602 is communicatively connected to at least one of the processors 601; wherein,

[0126] The memory 602 stores instructions that can be executed by at least one of the processors to enable the at least one of the processors to perform the aforementioned method for determining the limit working surface length.

[0127] Figure 6 Take the 601 processor as an example.

[0128] The electronic device may also include an input device 603 and a display device 604.

[0129] The processor 601, memory 602, input device 603 and display device 604 can be connected by a bus or other means. The figure shows an example of connection by a bus.

[0130] The memory 602, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as the program instructions / modules corresponding to the method for determining the limit working surface length in the embodiments of this application, for example, Figure 1 , Figure 2 The method flow is shown. The processor 601 executes various functional applications and data processing by running non-volatile software programs, instructions, and modules stored in the memory 602, thereby realizing the method for determining the limit working surface length in the above embodiments.

[0131] Memory 602 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application program required for at least one function; the data storage area may store data created based on the use of the extreme working surface length determination method, etc. Furthermore, memory 602 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, memory 602 may optionally include memory remotely located relative to processor 601, and these remote memories may be connected via a network to the apparatus performing the extreme working surface length determination method. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0132] The input device 603 can receive user clicks and generate signal inputs related to user settings and function control for the method of determining the limit working surface length. The display device 604 may include a display screen or other display device.

[0133] When one or more modules are stored in the memory 602, and are run by one or more processors 601, the method for determining the limit working surface length in any of the above method embodiments is executed.

[0134] This invention calculates the mining-induced coefficient and determines the mining state based on it. Then, in both fully and over-fully mined states, it calculates the basin diameter based on the maximum surface subsidence and the ultimate working face length based on the actual working face length and the basin diameter. This invention calculates the basin diameter in both fully and over-fully mined states, enabling the calculation of uniform surface subsidence and continuous deformation boundary dimensions, thus obtaining an accurate ultimate working face length. Furthermore, the monitoring cost of maximum surface subsidence is low, thereby reducing the overall computational cost.

[0135] One embodiment of the present invention provides a storage medium that stores computer instructions, which, when executed by a computer, are used to perform all the steps of the method for determining the length of the limiting working surface as described above.

[0136] In the context of this disclosure, a storage medium can be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or device. The storage medium can be a machine-readable signal medium or a machine-readable storage medium. Optionally, the storage medium can be a non-transitory computer-readable storage medium, such as a ROM, random access memory (RAM), compact disc ROM (CD-ROM), magnetic tape, floppy disk, and optical data storage device.

[0137] One embodiment of the present invention provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the method for determining the limit working surface length as described above.

[0138] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A method for determining the length of a limiting working surface, characterized in that, include: Calculate the mining activation coefficient and determine the mining status based on the mining activation coefficient; When the mining state is fully or over-fully mined, the maximum surface subsidence is obtained, and the basin diameter is calculated based on the maximum surface subsidence. Obtain the actual working face length, and calculate the limit working face length based on the actual working face length and the basin diameter.

2. The method for determining the length of the limiting working surface according to claim 1, characterized in that, The method of determining the mining status based on the mining activity coefficient includes: Obtain the burial depth, and calculate the mining coefficient threshold based on the burial depth; If the mining coefficient is greater than or equal to the mining coefficient threshold, the mining status is either fully or over-fully mined; otherwise, it is judged as under-mined.

3. The method for determining the length of the limiting working surface according to claim 2, characterized in that, The calculation of the mining coefficient threshold based on burial depth includes: If the burial depth is greater than or equal to the preset burial depth threshold, the initial limit working face length is calculated as L' = A + H / π, where L' is the initial limit working face length, H is the burial depth, and A is the first constant. If the burial depth is less than the preset burial depth threshold, the initial limit working face length is calculated as L'=(BH / C)*H, where B is the second constant and C is the third constant; The threshold for the mining factor is the mining factor corresponding to the initial limit working face length.

4. The method for determining the length of the limiting working surface according to claim 1, characterized in that, The calculation of the basin diameter based on the maximum surface subsidence includes: Calculate the basin boundary settlement based on the maximum surface subsidence and the basin boundary coefficient; Determine the two boundary locations of the basin boundary subsidence within the basin boundary, and obtain the distance between the two boundary locations as the basin diameter.

5. The method for determining the length of the limiting working surface according to claim 3, characterized in that, The calculation of basin boundary subsidence based on the maximum surface subsidence and basin boundary coefficient includes: The basin boundary settlement is calculated as: w = k × W, where w is the basin boundary settlement, k is the basin boundary coefficient, and W is the maximum surface subsidence.

6. The method for determining the length of the limiting working surface according to claim 1, characterized in that, The calculation of the limiting working face length based on the actual working face length and the basin diameter includes: The limit working face length is calculated as: L = DR, where L is the limit working face length, D is the actual working face length, and R is the basin diameter.

7. The method for determining the length of the limiting working face according to claim 1, characterized in that, Also includes: The loss reduction rate is calculated based on the actual working face length and the limiting working face length. Where D is the actual working face length and L is the limit working face length.

8. An electronic device, characterized in that, include: At least one processor; as well as, A memory communicatively connected to at least one of the processors; wherein, The memory stores instructions executable by at least one of the processors, which enable the at least one processor to perform the method for determining the limit working surface length as described in any one of claims 1 to 7.

9. A storage medium, characterized in that, The storage medium stores computer instructions, which, when executed by the computer, are used to perform all the steps of the method for determining the limit working face length as described in any one of claims 1 to 7.

10. A computer program product comprising a computer program / instructions, characterized in that, When the computer program / instruction is executed by the processor, it implements the method for determining the limit working surface length as described in any one of claims 1 to 7.

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