Large mining depth thick coal seam strip mining method and device
By determining the subsidence coefficient and mining deformation value in the strip mining of deep coal seams, and selecting appropriate mining and coal pillar widths, the problem of low design efficiency was solved, and a safe and efficient mining scheme design was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-16
- Publication Date
- 2026-04-03
AI Technical Summary
Existing technologies have low design efficiency in strip mining of deep coal seams, requiring extensive data review and full-range prediction of mining deformation, resulting in a large workload and low design efficiency.
By determining the subsidence coefficient of the coal seam to be mined under different dip mining widths, calculating the mining deformation value, selecting the dip mining width where the mining deformation is less than or equal to 60% of the allowable deformation of the structure as the target mining width, and calculating the coal pillar safety factor and coal resource area recovery rate, a suitable coal pillar retention width is selected.
It improves the design efficiency of strip mining, ensures the protection of structures, enhances the safety and resource recovery rate of mining, and reduces the complexity of scheme design.
Smart Images
Figure CN121781928A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of coal mining technology, and in particular to a method and apparatus for large-scale deep coal seam strip mining. Background Technology
[0002] For deep coal seams with a mining depth greater than 800m or even exceeding 1000m, the increased overlying strata thickness leads to increased mine pressure and coal pillar compression, thus raising the requirements for coal pillar stability. Strip mining has unique rules for reducing subsidence, and these factors need to be fully considered in the design of the scheme. The design scheme should be determined comprehensively based on the protection requirements of surface structures and the coal seam occurrence conditions, including specific mining parameters such as the mining width and the width of the coal pillar.
[0003] However, existing strip design technology often requires consulting a large amount of data when comprehensively determining the design scheme based on various factors such as the overburden structure of deep coal seams, the protection requirements of surface buildings, and the occurrence conditions of coal seams. On this basis, it is necessary to predict the mining deformation of all alternative design schemes, which results in a large workload and low design efficiency. Summary of the Invention
[0004] This invention provides a method and apparatus for deep coal seam strip mining, which solves the technical problem of low efficiency in the prior art of deep coal seam strip mining.
[0005] This invention provides a method for strip mining of deep coal seams, comprising the following steps: Determine the subsidence coefficient of the coal seam to be mined under different dip mining widths; Based on the subsidence coefficient, the mining deformation value of a single working face corresponding to the different dip mining widths is determined; The target mining width of the strip pillar in the coal seam to be mined is the inclined mining width corresponding to the condition that the mining deformation value is less than or equal to 60% of the allowable deformation of the structure. Based on the target mining width, calculate the coal pillar safety factor and coal resource area recovery rate corresponding to different coal pillar retention widths; The target width of the strip coal pillar in the coal seam to be mined is defined as the coal pillar width corresponding to a coal pillar safety factor greater than 1.5 and a coal resource area recovery rate greater than or equal to 40% and less than or equal to 60%.
[0006] According to the present invention, a method for strip mining of deep coal seams includes determining the subsidence coefficient of the coal seam to be mined under different dip mining widths, comprising: Determine the length of the mining operation; Calculate the mining tendency coefficient based on the stated mining tendency width; Calculate the strike mining intensity coefficient based on the stated strike mining length; The subsidence coefficient is determined based on the tendency mining degree coefficient and the strike mining degree coefficient.
[0007] According to a method for strip mining of deep coal seams provided by the present invention, the step of determining the subsidence coefficient based on the dip mining degree coefficient and the strike mining degree coefficient includes: Based on the coal seam thickness and dip angle of the coal seam to be mined, the normal mining thickness of the coal seam to be mined is determined; The subsidence coefficient is determined based on the dip mining degree coefficient, the strike mining degree coefficient, and the normal mining thickness.
[0008] According to a method for strip mining of deep coal seams provided by the present invention, the determination of the dip mining width includes: The bedrock thickness of the coal seam to be mined is determined based on the overburden structure of the coal seam to be mined and the mining depth of the working face. Multiple inclined mining widths are determined from 1 / 3 to 1 / 4 of the bedrock thickness of the coal seam to be mined.
[0009] According to the present invention, a method for strip mining of deep coal seams, wherein determining the mining deformation value of a single working face corresponding to different dip mining widths based on the subsidence coefficient includes: Determine the mining sufficiency corresponding to the different mining widths; Based on the subsidence coefficient and the mining sufficiency, the probability integral is performed on all mining points on the single working face to obtain the mining deformation value.
[0010] According to the present invention, a method for strip mining of deep coal seams is provided, wherein the calculation of the coal pillar safety factor and coal resource area recovery rate corresponding to different coal pillar widths based on the target mining width includes: Calculate the actual load on the coal pillar based on the target mining width and the coal pillar retention width; Calculate the maximum load on the coal pillar based on the mining depth of the working face; The ratio of the maximum load on the coal pillar to the actual load on the coal pillar is used as the safety factor of the coal pillar. The coal resource area recovery rate is calculated based on the target mining width and the coal pillar retention width.
[0011] The present invention also provides a strip mining device for deep coal seams, comprising the following modules: The first determining module is used to determine the subsidence coefficient of the coal seam to be mined under different dip mining widths; The second determining module is used to determine the mining deformation value of a single working face corresponding to the different inclined mining widths based on the subsidence coefficient. The first selection module is used to take the inclined mining width corresponding to the condition that the mining deformation value is less than or equal to 60% of the allowable deformation of the structure as the target mining width of the strip coal pillar in the coal seam to be mined. The calculation module is used to calculate the coal pillar safety factor and coal resource area recovery rate corresponding to different coal pillar leaving widths based on the target mining width; The second selection module is used to determine the target width of the strip coal pillar in the coal seam to be mined, based on the coal pillar safety factor being greater than 1.5 and the coal resource area recovery rate being greater than or equal to 40% and less than or equal to 60%.
[0012] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor executes the computer program to implement the strip mining method for deep coal seams as described above.
[0013] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the strip mining method for deep coal seams as described above.
[0014] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the strip mining method for deep coal seams as described above.
[0015] The present invention provides a method and apparatus for strip mining of deep coal seams. By determining the subsidence coefficient corresponding to different dip mining widths of the coal seam to be mined, the surface subsidence law after mining is quantified, providing basic parameters for predicting deformation caused by mining and ensuring that the design is based on actual geological conditions. Based on the subsidence coefficient, the mining-induced deformation value of a single working face corresponding to the different dip mining widths is determined. The dip mining width corresponding to a strip width where the mining-induced deformation value is less than or equal to 60% of the allowable deformation of the structure is used as the target mining width for the strip coal pillar in the coal seam to be mined. This strictly limits the deformation value within a safe threshold, ensuring that the mining width will not cause excessive damage to the structure and improving protection. Effects: Based on the target mining width, the safety factor and coal resource area recovery rate corresponding to different coal pillar widths are calculated respectively, and the feasibility and economy of the coal pillar width are evaluated, thereby improving the safety and efficiency of mining; the coal pillar width corresponding to the coal pillar safety factor being greater than 1.5 and the coal resource area recovery rate being greater than or equal to 40% and less than or equal to 60% is taken as the target width of the strip coal pillar in the coal seam to be mined. Taking into account the requirements of safety and resource recovery, the optimal mining width is quickly determined, reducing the complexity of the scheme design. On the basis of achieving building protection and efficient resource recovery, the mining scheme can be quickly determined, improving the efficiency of strip mining. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0017] Figure 1 This is a schematic flowchart of the deep coal seam strip mining method provided by the present invention.
[0018] Figure 2 This is a schematic diagram of the structure of the strip mining device for deep coal seams provided by the present invention.
[0019] Figure 3 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.
[0021] In existing technologies, the following should be considered when designing strip mining for large-scale, deep coal seams: 1. Analysis of the building's resistance to mining deformation. A survey of the protected building is conducted to understand its structure. Based on pre-set requirements, the building's protection level is determined, and its resistance to mining deformation is analyzed.
[0022] 2. Coal Seam Burial Depth Analysis. The burial depth of the coal seam is a major factor affecting the full exploitation of the working face. A greater mining depth results in a larger working face width for full exploitation. For working faces of the same width, a greater mining depth has a relatively smaller impact on surface deformation due to the constraints of full exploitation, while a smaller depth has a relatively larger impact on surface deformation.
[0023] 3. Analysis of coal seam occurrence and other factors. The thickness of the coal seam is also a major factor affecting ground deformation. The magnitude of deformation is directly proportional to the thickness of the coal seam; the greater the thickness, the greater the impact of deformation. This is detrimental to the protection of surface structures.
[0024] 4. Overburden Structure Analysis. Overburden lithology is also a major factor affecting surface deformation. Harder lithology has a relatively smaller impact on surface deformation, while softer lithology has a relatively larger impact. Large topsoil layers increase the area affected by mining and can absorb some of the mining deformation, thus reducing the maximum deformation value under the same conditions.
[0025] 5. Geological Structure. Geological structures, especially faults, have a significant impact on surface movement and deformation. Mining at the working face may activate faults, thereby exacerbating surface movement and deformation. In strip mining, to facilitate the layout of the working face, faults should be placed within the strip coal pillar, and the width of the strip coal pillar should be appropriately increased to ensure the long-term stability of the strip coal pillar and achieve the subsidence reduction effect of strip mining.
[0026] By analyzing various factors such as the burial depth of deep coal seams, the thickness of the coal seam being mined, the overlying rock structure and lithology, and geological structure, and combining the measured rock movement parameters of a single working face in the mine with the protection requirements for surface structures, a comprehensive determination of the strip mining scheme for deep coal seams can be made, as well as the determination of the reasonable mining width and the width of the coal pillar.
[0027] However, the design of mining parameters such as mining width and coal pillar width in existing technologies is often complicated and cumbersome, resulting in slow mining progress and low mining efficiency. To address this, the present invention provides a method and apparatus for strip mining of deep coal seams, which can be used to design mining parameters under deep coal seam conditions in a simple and quick manner, thereby improving strip mining efficiency.
[0028] The following is combined Figures 1 to 3 The present invention describes a method and apparatus for deep coal seam strip mining.
[0029] Figure 1 This is a schematic flowchart of the deep coal seam strip mining method provided by the present invention, as shown below. Figure 1 As shown, the method includes the following steps: Step 101: Determine the subsidence coefficient of the coal seam to be mined under different dip mining widths; Furthermore, the determination of the inclined mining width includes: The bedrock thickness of the coal seam to be mined is determined based on the overburden structure of the coal seam to be mined and the mining depth of the working face. Multiple inclined mining widths are determined from 1 / 3 to 1 / 4 of the bedrock thickness of the coal seam to be mined.
[0030] Specifically, by comprehensively analyzing the overburden structure information of the coal seam to be mined from geological exploration data, the location of the bedrock roof and floor is accurately identified, and the specific value of the bedrock thickness is calculated using their elevation differences. Simultaneously, the overall data rationality is verified in conjunction with the mining depth of the working face, thereby improving the accuracy of the calculations.
[0031] Understandably, the width of strip mining should ensure the formation of a stable "pressure arch" structure in the overlying strata, thereby transferring most of the load to the coal pillars on both sides and reducing deformation in the middle of the goaf. Based on the experience of strip mining, controlling the mining width between 1 / 3 and 1 / 4 of the bedrock thickness is conducive to the formation of the "pressure arch" structure, ensuring a certain scale of mining while effectively controlling strata movement. For example, within 1 / 3 to 1 / 4 of the bedrock thickness, multiple dip mining widths of 3, 4, or 5 can be selected.
[0032] In one embodiment, if the bedrock thickness is approximately 700 m, then one-third to one-quarter of the bedrock thickness is approximately 233 m to 175 m. Within this range, 200 m, 180 m, and 160 m can be selected as the dip width for mining.
[0033] By linking the inclined mining width with the bedrock thickness, the embodiments of the present invention provide a clear geological and engineering basis for the initial selection range, avoid blind selection, and thus improve mining efficiency.
[0034] Furthermore, the subsidence coefficient of the coal seam to be mined is determined for different dip mining widths, including: Determine the length of the mining operation; Calculate the mining tendency coefficient based on the stated mining tendency width; Calculate the strike mining intensity coefficient based on the stated strike mining length; The subsidence coefficient is determined based on the tendency mining degree coefficient and the strike mining degree coefficient.
[0035] Further, determining the subsidence coefficient based on the tendency mining degree coefficient and the directional mining degree coefficient includes: Based on the coal seam thickness and dip angle of the coal seam to be mined, the normal mining thickness of the coal seam to be mined is determined; The subsidence coefficient is determined based on the dip mining degree coefficient, the strike mining degree coefficient, and the normal mining thickness.
[0036] Specifically, the actual surface subsidence is not solely determined by the coal seam thickness, but is also closely related to the ratio of the working face's mining dimensions to its mining depth in both the dip and strike directions. The strike mining length can be directly set based on the coal seam structure. When the working face size is small (insufficient mining), the subsidence of the overlying strata is constrained by the support of the surrounding coal and rock mass, resulting in insufficient surface subsidence. By calculating the mining degree coefficients for both the dip and strike directions separately, a more realistic subsidence coefficient can be calculated.
[0037] The formula for calculating the propensity to take action coefficient is as follows: The formula for calculating the mining intensity coefficient is as follows: In the formula, These are the dip width and strike length, respectively. This represents the average mining depth. This is a coefficient, typically set to 0.8.
[0038] The normal thickness of the coal seam to be mined is ,in, This indicates the thickness of the coal seam to be mined. This indicates the dip angle of the coal seam to be mined.
[0039] Calculate the subsidence coefficient based on the dip-mining degree coefficient and the strike-mining degree coefficient. The calculation expression is as follows: In the formula, These are the tendency mining degree coefficient and the strike mining degree coefficient, respectively. If the calculated... or If the value is greater than 1, then the value is 1. This includes the maximum surface subsidence value. These are the parameters that were actually measured.
[0040] The embodiments of the present invention introduce dip mining degree coefficient and strike mining degree coefficient, which makes the determination of subsidence coefficient more accurate. It is especially suitable for strip mining, a typical case of insufficient mining, and avoids the problem of overestimation of predicted values caused by directly using sufficient mining parameters. It provides accurate parameters for subsequent calculation of mining deformation values of the working face and improves the accuracy of surface movement deformation calculation.
[0041] Step 102: Based on the subsidence coefficient under the fully mined conditions, determine the mining deformation value of a single working face corresponding to the different dip mining widths; further, determining the mining deformation value of a single working face corresponding to the different dip mining widths based on the subsidence coefficient includes: Determine the mining sufficiency corresponding to the different mining widths; Based on the subsidence coefficient and the mining sufficiency, the probability integral is performed on all mining points on the single working face to obtain the mining deformation value.
[0042] Specifically, mining sufficiency is an indicator that measures whether the impact of mining on the surface of a working face has reached a state of full mining activity. It can be characterized by the dip mining degree coefficient and the strike mining degree coefficient.
[0043] For example, when the length and width of the working face increase to a certain extent (such as being greater than or equal to a certain preset threshold), the subsidence value of the ground reaches the maximum value under the geological mining conditions. At this point, if the size of the working face is further increased (such as the inclined mining width), the subsidence value will no longer increase. At this point, the mining activity coefficient n=1, which means that the mining sufficiency corresponding to the current inclined mining width is fully mined.
[0044] For example, when the working face is small, the surface subsidence will be supported and constrained by the unmined coal and rock mass around the goaf, resulting in the maximum surface subsidence being less than the maximum value when fully mined. In this case, the mining degree coefficient n < 1, which means that the mining degree corresponding to the current tendency mining width is not fully mined.
[0045] Probability integrals treat the mining unit (i.e., the mining point) as an influence source, and its influence on the surface points has a certain probability distribution relationship with the distance. By integrating over the entire mining area, the surface deformation caused by mining can be predicted.
[0046] In probabilistic integral calculations, the subsidence coefficient and mining adequacy of a single working face are input into the probabilistic integral method prediction software. Through the software's internal probabilistic integral method model, numerical integration is performed over the entire working face area. This allows for probabilistic integration of all mining points on a single working face, yielding the mining-induced deformation value. The probabilistic integral method prediction software can be any of the following: mining subsidence prediction software, mining surface deformation prediction system, MineMetriX subsidence prediction software, or Gem4D underground analysis expert system.
[0047] This invention improves the scientific rigor and accuracy of calculating the mining deformation values of a single working face corresponding to different mining widths by combining the probability integral method with the theory of incomplete mining.
[0048] Step 103: The target mining width of the strip pillar in the coal seam to be mined is the inclined mining width corresponding to the condition that the mining deformation value is less than or equal to 60% of the allowable deformation of the structure. Specifically, firstly, based on the structure and pre-set requirements of the building, the corresponding protection level of the building is determined, and the building's resistance to mining deformation is analyzed. Then, the mining deformation value corresponding to different inclined mining widths is calculated. If the mining deformation value is less than or equal to 60% of the building's allowable deformation, it is determined that the current inclined mining width meets the requirements (i.e., it can meet the pre-set requirements for building protection). The inclined mining width at this time is used as the target mining width.
[0049] For example, in one embodiment, the protected building is a historically valuable masonry complex with a fragile structure, whose permissible horizontal deformation is determined to be [ε] = 2.0 mm / m. The mining depth is H = 850 m, and the coal seam thickness is m = 4.5 m. The fully mined subsidence coefficient q = 0.70 has been determined.
[0050] Based on the bedrock thickness, four initial mining widths were selected: b1=180m, b2=200m, b3=220m, and b4=240m.
[0051] The allowable deformation of the building is calculated to be 60%: 0.6 × [ε] = 0.6 × 2.0 mm / m = 1.2 mm / m, which serves as the critical criterion for selecting the first target mining width.
[0052] Expected mining deformation values for each dip width: Using the probability integral method, and inputting the mining sufficiency parameters corresponding to each width, the maximum horizontal deformation value caused by mining a single working face is expected to be as follows: The mining deformation value corresponding to a mining width b1=180m is ε1=1.0mm / m; The mining deformation value corresponding to a mining width b2 = 200m is ε2 = 1.3mm / m; The mining deformation value corresponding to a mining width b3 = 220m is ε3 = 1.7mm / m; The mining deformation value corresponding to a mining width b4=240m is ε4=2.2mm / m.
[0053] The mining deformation values corresponding to the mining widths of each dip direction are compared with the critical standard (1.2 mm / m): ε1(1.0mm / m)≤1.2mm / m, which meets the requirements; ε2 (1.3 mm / m) > 1.2 mm / m, which does not meet the requirements; ε3 (1.7 mm / m) > 1.2 mm / m, which does not meet the requirements; ε4(2.2mm / m)>1.2mm / m, which does not meet the requirements.
[0054] Only a mining width of b1=180m satisfies the condition that the mining deformation value is less than or equal to 60% of the allowable deformation of the structure. Therefore, 180m is determined as the target mining width, and this will be used in the subsequent calculation of the coal pillar safety factor and recovery rate.
[0055] Because the protected objects are of a high level and have a small allowable deformation value, the screening criteria are extremely strict (1.2mm / m). Therefore, most of the wider options (200m and above) are directly excluded, which allows for the rapid determination of a suitable mining width and reduces the complexity of the screening.
[0056] In addition, since strip mining usually involves the successive mining of multiple working faces, the mining impact of each working face will have a cumulative effect. Therefore, the embodiment of the present invention adopts the standard that the deformation value of a single working face does not exceed 60% of the total allowable value, which reserves sufficient safety space (about 40% margin) for the mining impact of subsequent working faces, ensuring that the total deformation value does not exceed the building's bearing limit after the entire mining area is completed, thereby improving the reliability and safety of mining operations.
[0057] Step 104: Based on the target mining width, calculate the coal pillar safety factor and coal resource area recovery rate corresponding to different coal pillar retention widths; Furthermore, based on the target mining width, the calculation of the coal pillar safety factor and coal resource area recovery rate corresponding to different coal pillar widths includes: Calculate the actual load on the coal pillar based on the target mining width and the coal pillar retention width; Calculate the maximum load on the coal pillar based on the mining depth of the working face; The ratio of the maximum load on the coal pillar to the actual load on the coal pillar is used as the safety factor of the coal pillar. The coal resource area recovery rate is calculated based on the target mining width and the coal pillar retention width.
[0058] Specifically, in strip mining, to ensure the subsidence reduction effect, the strip coal pillar supporting the overlying strata needs to have long-term stability. This invention employs Wilson's two-zone constraint theory, dividing the strip coal pillar into a yield zone and a core zone, with the core zone providing the main bearing capacity. The safety factor is defined as the ratio of the ultimate bearing capacity of the core zone (i.e., the maximum load on the coal pillar) to the actual load borne (i.e., the actual load on the coal pillar).
[0059] Given a target mining width, multiple corresponding coal pillar widths can be preset based on the total width of the coal pillar.
[0060] Considering the bearing capacity of gangue in the goaf, calculate the actual load borne by the coal pillar. for: In the formula, a is the width of the coal pillar (in meters); b is the first target mining width (in meters); and γ is the average density of the overburden (in kg / m³). 3 H represents the working face mining depth in meters; when b > 0.6H, b = 0.6H is taken.
[0061] There are yield zones with a width of 0.00492mH on both sides of the coal pillar (m is the mining thickness of the coal seam, and H is the mining depth). The core zone is located within the yield zone, and the bearing capacity of the core zone is 4γH.
[0062] Maximum load of coal pillar for: The stability of a strip coal pillar is determined using the coal pillar safety factor, which is calculated using the following expression: The formula for calculating the coal resource area recovery rate is b / (a+b).
[0063] This invention provides a standard method for quantitatively assessing coal pillar stability, transforming "coal pillar safety" from a qualitative concept into a calculable indicator, facilitating engineering judgment. Simultaneously, it clarifies the calculation method for resource recovery rate, directly quantifying the economic benefits corresponding to mining plans. This enables rapid determination of appropriate mining widths, reduces screening complexity, increases the speed of screening mining widths, facilitates rapid development of mining plans, and improves mining efficiency.
[0064] Step 105: The coal pillar width corresponding to the condition that the safety factor of the coal pillar is greater than 1.5 and the coal resource area recovery rate is greater than or equal to 40% and less than or equal to 60% is taken as the target width of the strip coal pillar in the coal seam to be mined.
[0065] Specifically, when the safety factor of the coal pillar is greater than 1.5 and the coal resource area recovery rate is greater than or equal to 40% and less than or equal to 60%, the corresponding coal pillar width can simultaneously meet the requirements of mining operation safety and economic benefits.
[0066] Based on the above calculation expression for coal resource area recovery rate, in some embodiments, under the condition that the safety factor of the coal pillar is greater than 1.5, the coal resource area recovery rate can be further optimized by adjusting the width of the coal pillar, thereby improving economic benefits.
[0067] This invention, through its embodiments, selects a target mining width from the inclined mining width to meet the requirements of structure protection; improves the safety of mining operations by calculating the coal pillar safety factor; and quantifies economic benefits by calculating the coal resource area recovery rate. Through multi-stage, multi-index step-by-step selection, it comprehensively solves the three core, contradictory issues in strip mining: structure protection, coal pillar safety, and resource recovery rate. This allows for the simple and rapid determination of the target mining width and target retention width under conditions of large-scale mining of deep coal seams, applicable to strip mining of coal pillars in the coal seam to be mined.
[0068] Based on the above embodiments, the deep coal seam strip mining method provided by the present invention quantifies the surface subsidence law after mining by determining the subsidence coefficient corresponding to different dip mining widths of the coal seam to be mined, providing basic parameters for predicting deformation caused by mining and ensuring that the design is based on actual geological conditions; based on the subsidence coefficient, the mining deformation value of a single working face corresponding to the different dip mining widths is determined; the dip mining width corresponding to the strip width where the mining deformation value is less than or equal to 60% of the allowable deformation of the structure is taken as the target mining width of the strip coal pillar in the coal seam to be mined, thereby strictly limiting the deformation value within a safe threshold to ensure that the mining width will not cause excessive damage to the structure and improve the protection effect. Based on the target mining width, the safety factor of the coal pillar and the coal resource area recovery rate corresponding to different coal pillar widths are calculated respectively to evaluate the feasibility and economy of the mining width, thereby improving the safety and efficiency of mining. The coal pillar width corresponding to the coal pillar safety factor being greater than 1.5 and the coal resource area recovery rate being greater than or equal to 40% and less than or equal to 60% is taken as the target width of the strip coal pillar in the coal seam to be mined. By setting a threshold for screening and comprehensively considering safety and resource recovery requirements, the optimal mining width can be quickly determined, reducing the complexity of the scheme design. On the basis of achieving building protection and efficient resource recovery, the mining scheme can be quickly determined, improving the efficiency of strip mining.
[0069] The following describes the strip mining apparatus for deep coal seams provided by the present invention. The strip mining apparatus for deep coal seams described below can be referred to in correspondence with the strip mining method for deep coal seams described above.
[0070] Figure 2 This is a schematic diagram of the structure of the deep coal seam strip mining device provided by the present invention, as shown below. Figure 2 As shown. An embodiment of the present invention provides a strip mining device for deep coal seams, comprising a first determining module 201, a second determining module 202, a first selecting module 203, a calculation module 204, and a second selecting module 205, wherein: The first determining module 201 is used to determine the subsidence coefficient corresponding to different dip mining widths of the coal seam to be mined; the second determining module 202 is used to determine the mining deformation value of a single working face corresponding to the different dip mining widths based on the subsidence coefficient; the first selecting module 203 is used to take the dip mining width corresponding to the mining deformation value being less than or equal to 60% of the allowable deformation of the structure as the target mining width of the strip coal pillar in the coal seam to be mined; the calculation module 204 is used to calculate the coal pillar safety factor and coal resource area recovery rate corresponding to different coal pillar retention widths based on the target mining width; the second selecting module 205 is used to take the coal pillar retention width corresponding to the coal pillar safety factor being greater than 1.5 and the coal resource area recovery rate being greater than or equal to 40% and less than or equal to 60% as the target retention width of the strip coal pillar in the coal seam to be mined.
[0071] The strip mining device for deep coal seams provided by this invention quantifies the surface subsidence pattern after mining by determining the subsidence coefficient corresponding to different dip mining widths of the coal seam to be mined, providing basic parameters for predicting deformation caused by mining and ensuring that the design is based on actual geological conditions. Based on the subsidence coefficient, the mining-induced deformation value of a single working face corresponding to the different dip mining widths is determined. The dip mining width corresponding to a mining-induced deformation value less than or equal to 60% of the allowable deformation of the structure is used as the target mining width for the strip coal pillar in the coal seam to be mined. This strictly limits the deformation value within a safe threshold, ensuring that the mining width does not cause excessive damage to the structure and improving the protection effect. Based on the target mining width, the safety factor and coal resource area recovery rate corresponding to different coal pillar widths are calculated respectively to evaluate the feasibility and economy of the coal pillar width, thereby improving the safety and efficiency of mining. The coal pillar width corresponding to the coal pillar safety factor being greater than 1.5 and the coal resource area recovery rate being greater than or equal to 40% and less than or equal to 60% is taken as the target width of the strip coal pillar in the coal seam to be mined. Taking into account the requirements of safety and resource recovery, the optimal mining width is quickly determined, reducing the complexity of the scheme design. On the basis of achieving building protection and efficient resource recovery, the mining scheme can be quickly determined, improving the efficiency of strip mining.
[0072] Figure 3 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 3As shown, the electronic device may include: a processor 310, a communication interface 320, a memory 330, and a communication bus 340, wherein the processor 310, the communication interface 320, and the memory 330 communicate with each other via the communication bus 340. The processor 310 can call logical instructions in the memory 330 to execute a method for deep coal seam strip mining, which includes: Determine the subsidence coefficient of the coal seam to be mined under different dip mining widths; Based on the subsidence coefficient, the mining deformation value of a single working face corresponding to the different dip mining widths is determined; The target mining width of the strip pillar in the coal seam to be mined is the inclined mining width corresponding to the condition that the mining deformation value is less than or equal to 60% of the allowable deformation of the structure. Based on the target mining width, calculate the coal pillar safety factor and coal resource area recovery rate corresponding to different coal pillar retention widths; The target width of the strip coal pillar in the coal seam to be mined is defined as the coal pillar width corresponding to a coal pillar safety factor greater than 1.5 and a coal resource area recovery rate greater than or equal to 40% and less than or equal to 60%.
[0073] Furthermore, the logical instructions in the aforementioned memory 330 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.
[0074] On the other hand, the present invention also provides a computer program product, the computer program product comprising a computer program that can be stored on a non-transitory computer-readable storage medium, wherein when the computer program is executed by a processor, the computer is able to execute the deep coal seam strip mining method provided by the above methods, the method comprising: Determine the subsidence coefficient of the coal seam to be mined under different dip mining widths; Based on the subsidence coefficient, the mining deformation value of a single working face corresponding to the different dip mining widths is determined; The target mining width of the strip pillar in the coal seam to be mined is the inclined mining width corresponding to the condition that the mining deformation value is less than or equal to 60% of the allowable deformation of the structure. Based on the target mining width, calculate the coal pillar safety factor and coal resource area recovery rate corresponding to different coal pillar retention widths; The target width of the strip coal pillar in the coal seam to be mined is defined as the coal pillar width corresponding to a coal pillar safety factor greater than 1.5 and a coal resource area recovery rate greater than or equal to 40% and less than or equal to 60%.
[0075] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the deep coal seam strip mining method provided by the methods described above, the method comprising: Determine the subsidence coefficient of the coal seam to be mined under different dip mining widths; Based on the subsidence coefficient, the mining deformation value of a single working face corresponding to the different dip mining widths is determined; The target mining width of the strip pillar in the coal seam to be mined is the inclined mining width corresponding to the condition that the mining deformation value is less than or equal to 60% of the allowable deformation of the structure. Based on the target mining width, calculate the coal pillar safety factor and coal resource area recovery rate corresponding to different coal pillar retention widths; The target width of the strip coal pillar in the coal seam to be mined is defined as the coal pillar width corresponding to a coal pillar safety factor greater than 1.5 and a coal resource area recovery rate greater than or equal to 40% and less than or equal to 60%.
[0076] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.
[0077] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.
[0078] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.
[0079] In this application's embodiments, "determine B based on A" means that factor A must be considered when determining B. It is not limited to "B can be determined based solely on A," but should also include: "determine B based on A and C," "determine B based on A, C, and E," "determine C based on A, and further determine B based on C," etc. Additionally, it can include using A as a condition for determining B, for example, "when A meets the first condition, determine B using the first method"; another example, "when A meets the second condition, determine B," etc.; another example, "when A meets the third condition, determine B based on the first parameter," etc. Of course, it can also be a condition where A is a factor in determining B, for example, "when A meets the first condition, determine C using the first method, and further determine B based on C," etc.
[0080] It should also be noted that the terms "target," "first," and "second" in this invention are used to distinguish similar objects, not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same class, without limiting the number of objects; for example, the first object can be one or more.
[0081] In this invention, the term "multiple" refers to two or more, and other quantifiers are similar.
[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A method for strip mining of deep coal seams, characterized in that, include: Determine the subsidence coefficient of the coal seam to be mined under different dip mining widths; Based on the subsidence coefficient, the mining deformation value of a single working face corresponding to the different dip mining widths is determined; The target mining width of the strip pillar in the coal seam to be mined is the inclined mining width corresponding to the condition that the mining deformation value is less than or equal to 60% of the allowable deformation of the structure. Based on the target mining width, calculate the coal pillar safety factor and coal resource area recovery rate corresponding to different coal pillar retention widths; The target width of the strip coal pillar in the coal seam to be mined is defined as the coal pillar width corresponding to a coal pillar safety factor greater than 1.5 and a coal resource area recovery rate greater than or equal to 40% and less than or equal to 60%.
2. The method for strip mining of deep coal seams according to claim 1, characterized in that, Determining the subsidence coefficient of the coal seam to be mined under different dip mining widths includes: Determine the length of the mining operation; Calculate the mining tendency coefficient based on the stated mining tendency width; Calculate the strike mining intensity coefficient based on the stated strike mining length; The subsidence coefficient is determined based on the tendency mining degree coefficient and the strike mining degree coefficient.
3. The method for strip mining of deep coal seams according to claim 2, characterized in that, The determination of the subsidence coefficient based on the tendency mining degree coefficient and the strike mining degree coefficient includes: Based on the coal seam thickness and dip angle of the coal seam to be mined, the normal mining thickness of the coal seam to be mined is determined; The subsidence coefficient is determined based on the dip mining degree coefficient, the strike mining degree coefficient, and the normal mining thickness.
4. The method for strip mining of deep coal seams according to claim 1, characterized in that, The determination of the inclined mining width includes: The bedrock thickness of the coal seam to be mined is determined based on the overburden structure of the coal seam to be mined and the mining depth of the working face. Multiple inclined mining widths are determined from 1 / 3 to 1 / 4 of the bedrock thickness of the coal seam to be mined.
5. The method for strip mining of deep coal seams according to claim 4, characterized in that, The determination of the mining deformation value of a single working face corresponding to different dip mining widths based on the subsidence coefficient includes: Determine the mining sufficiency corresponding to the different mining widths; Based on the subsidence coefficient and the mining sufficiency, the probability integral is performed on all mining points on the single working face to obtain the mining deformation value.
6. The method for strip mining of deep coal seams according to claim 5, characterized in that, The calculation of the coal pillar safety factor and coal resource area recovery rate corresponding to different coal pillar widths based on the target mining width includes: Calculate the actual load on the coal pillar based on the target mining width and the coal pillar retention width; Calculate the maximum load on the coal pillar based on the mining depth of the working face; The ratio of the maximum load on the coal pillar to the actual load on the coal pillar is used as the safety factor of the coal pillar. The coal resource area recovery rate is calculated based on the target mining width and the coal pillar retention width.
7. A strip mining device for large-scale deep coal seam mining, characterized in that, include: The first determining module is used to determine the subsidence coefficient of the coal seam to be mined under different dip mining widths; The second determining module is used to determine the mining deformation value of a single working face corresponding to the different inclined mining widths based on the subsidence coefficient. The first selection module is used to take the inclined mining width corresponding to the condition that the mining deformation value is less than or equal to 60% of the allowable deformation of the structure as the target mining width of the strip coal pillar in the coal seam to be mined. The calculation module is used to calculate the coal pillar safety factor and coal resource area recovery rate corresponding to different coal pillar leaving widths based on the target mining width; The second selection module is used to determine the target width of the strip coal pillar in the coal seam to be mined, based on the coal pillar safety factor being greater than 1.5 and the coal resource area recovery rate being greater than or equal to 40% and less than or equal to 60%.
8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that, When the processor executes the computer program, it implements the strip mining method for deep coal seams as described in any one of claims 1 to 6.
9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the strip mining method for deep coal seams as described in any one of claims 1 to 6.
10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the strip mining method for deep coal seams as described in any one of claims 1 to 6.