Determination method for wide strip full column mining of nearly horizontal coal seam under constructed building

Abstract

The application provides a kind of to be built under the near horizontal coal seam suitable wide strip full column mining determination method, this method includes: establishing the plane coordinate system of mining area, and the boundary of mining area in plane coordinate system is carried out line integral calculation, obtains the surface static maximum horizontal tensile deformation value of mining area;Based on the surface dynamic and static horizontal tensile deformation ratio relationship and surface static maximum horizontal tensile deformation value, determine the surface dynamic maximum horizontal tensile deformation value of mining area;Based on surface dynamic maximum horizontal tensile deformation value and the surface maximum subsidence value of mining area, determine the near horizontal coal seam wide strip full column mining method suitable for the determination result of mining area.The application can accurately determine the applicability of near horizontal coal seam wide strip full column mining method according to the geological mining conditions of mining area, greatly improve the applicability of wide strip full column mining method to the coal resource mining under building (structure).

Description

Technical Field

[0001] This invention relates to the field of coal mining technology, and in particular to a method for determining whether wide-strip full-pillar mining is applicable to near-horizontal coal seams under buildings and structures. Background Technology

[0002] To address the issue of coal pressure beneath buildings and structures, existing technologies have proposed a wide-strip full-pillar mining method. This method fully utilizes the advantages of wide-strip mining, combined with the ability to adjust surface deformation values ​​based on extraction rate and mining width variations. It divides the coal pillar mining process for building protection into two stages: the wide-strip mining stage and the full-pillar mining stage. This reduces the management difficulty of simultaneously mining multiple working faces during full-pillar mining, significantly improves the coal pillar resource recovery rate, and minimizes the impact of the maximum deformation value caused by mining on the protected structure. This solves the problems of low resource recovery rate in wide-strip mining and poor feasibility of simultaneously mining multiple working faces in full-pillar mining.

[0003] However, currently, due to the wide and dispersed distribution of domestic coal resources, the geological and mining conditions in different mining areas are not entirely the same. There has been no good method to determine whether the wide-strip full-pillar mining method can be used to address the issue of coal under buildings in different mining areas and under different geological and mining conditions.

[0004] Therefore, how to accurately determine whether the wide strip full pillar mining method is suitable for the mining area based on the geological and mining conditions of the mining area has become a technical problem that the industry urgently needs to solve. Summary of the Invention

[0005] This invention provides a method for determining whether wide strip full pillar mining is applicable to near-horizontal coal seams under buildings and structures, so as to better determine whether the wide strip full pillar mining method is applicable to the mining area based on the geological and mining conditions of the mining area.

[0006] This invention provides a method for determining whether wide-strip full-pillar mining is applicable to near-horizontal coal seams under structures, including:

[0007] Establish a plane coordinate system for the mining area, and perform line integral calculation on the boundary of the mining area in the plane coordinate system to obtain the maximum static horizontal tensile deformation value of the surface of the mining area.

[0008] Based on the ratio of dynamic to static horizontal tensile deformation of the surface and the maximum static horizontal tensile deformation value of the surface, the maximum dynamic horizontal tensile deformation value of the surface in the mining area is determined.

[0009] Based on the maximum horizontal tensile deformation value of the surface dynamics and the maximum surface subsidence value of the mining area, the determination result of whether the wide strip full-pillar mining method is applicable to the mining area is obtained; the maximum surface subsidence value is determined based on the coal seam thickness and coal seam dip angle in the mining area.

[0010] According to a method for determining the suitability of wide-strip full-pillar mining for near-horizontal coal seams under structures provided by the present invention, line integral calculation is performed on the boundary of the mining area in the plane coordinate system to obtain the maximum static horizontal tensile deformation value of the surface of the mining area, including:

[0011] Based on the size of the mining area, determine the position coordinates corresponding to the maximum horizontal tensile deformation along the target coordinate axis in the planar coordinate system;

[0012] From the boundary of the mining area, determine the target boundary that is closest to the location coordinates;

[0013] The target boundary is calculated by line integral, and the position coordinates are substituted into the line integral calculation of the target boundary to obtain the maximum static horizontal tensile deformation value of the surface of the mining area.

[0014] According to the present invention, a method for determining the suitability of wide-strip full-pillar mining for near-horizontal coal seams under buildings and structures, the method for determining the maximum dynamic horizontal tensile deformation value of the mining area based on the ratio of dynamic to static horizontal tensile deformation of the surface and the maximum static horizontal tensile deformation value of the surface includes:

[0015] Substitute the working face mining speed, lithology-related time influence coefficient, and main influence radius of the mining area into the dynamic and static horizontal tensile deformation ratio relationship of the surface to determine the target ratio.

[0016] The maximum horizontal tensile deformation value of the surface in the mining area is obtained by multiplying the static maximum horizontal tensile deformation value of the surface with the target ratio.

[0017] According to a method for determining whether wide-strip full-pillar mining is suitable for near-horizontal coal seams under buildings and structures provided by the present invention, the method determines the suitability of the wide-strip full-pillar mining method for the mining area based on the maximum dynamic horizontal tensile deformation value of the surface and the maximum surface subsidence value of the mining area, including:

[0018] If the maximum horizontal tensile deformation value of the surface is less than the allowable deformation value of the surface buildings in the mining area, and the maximum subsidence value of the surface is less than the burial depth of the groundwater level under the mining area, then the near-horizontal coal seam wide strip full pillar mining method is determined to be applicable to the mining area.

[0019] or,

[0020] If the maximum horizontal tensile deformation value of the surface is not less than the allowable deformation value of the surface buildings in the mining area, or the maximum subsidence value of the surface is not less than the burial depth of the groundwater level, then the near-horizontal coal seam wide strip full-pillar mining method is determined to be unsuitable for the mining area.

[0021] According to the present invention, a method for determining the suitability of wide-strip full-pillar mining for near-horizontal coal seams under buildings and structures is provided. The maximum static horizontal tensile deformation value of the surface of the mining area is determined by the formula. The calculated value is ε. x1max The value of the static maximum horizontal tensile deformation of the ground surface is represented by b, which represents the horizontal displacement coefficient, and W. max The value represents the maximum subsidence of the ground surface, r represents the main influence radius, and l represents the size parameter of the mining area.

[0022] According to the present invention, a method for determining the suitability of wide-strip full-pillar mining for near-horizontal coal seams under buildings and structures is provided. The maximum dynamic horizontal tensile deformation value of the surface of the mining area is determined by the formula. The calculated value is ε. x2max The maximum horizontal tensile deformation value of the surface dynamic in the mining area is represented by v, the working face mining speed in the mining area is represented by c, the time influence coefficient related to lithology is represented by r, the main influence radius is represented by ξ1, the correction coefficient is represented by b, and the horizontal movement coefficient is represented by W. max The value represents the maximum subsidence of the ground surface, and l represents the size parameter of the mining area.

[0023] The present invention also provides a determination device for wide-strip full-pillar mining of near-horizontal coal seams under buildings and structures, comprising:

[0024] The calculation module is used to establish a planar coordinate system for the mining area and perform line integral calculations on the boundary of the mining area in the planar coordinate system to obtain the maximum static horizontal tensile deformation value of the surface of the mining area.

[0025] The processing module is used to determine the maximum dynamic horizontal tensile deformation value of the surface in the mining area based on the ratio of dynamic to static horizontal tensile deformation of the surface and the maximum static horizontal tensile deformation value of the surface.

[0026] The determination module is used to determine the applicability of the near-horizontal coal seam wide strip full-pillar mining method to the mining area based on the maximum horizontal tensile deformation value of the surface dynamic and the maximum subsidence value of the surface in the mining area; the maximum subsidence value of the surface is determined based on the coal seam thickness and the coal seam dip angle in the mining area.

[0027] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the determination method for wide strip full-pillar mining applicable to near-horizontal coal seams under any of the above-described structures.

[0028] 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 a method for determining whether a wide strip full-pillar mining method is applicable to near-horizontal coal seams under any of the above-described structures.

[0029] The present invention also provides a computer program product, including a computer program, which, when executed by a processor, implements a method for determining whether a wide strip full-pillar mining method is applicable to near-horizontal coal seams under any of the above-described structures.

[0030] The present invention provides a method for determining whether a wide strip full-pillar mining is suitable for near-horizontal coal seams under buildings and structures. By considering the influence of dynamic surface deformation and surface subsidence during the advancement of the mining face, a plane coordinate system of the mining area is established, and the boundary of the mining area in the plane coordinate system is calculated by line integral to obtain the maximum static horizontal tensile deformation value of the surface of the mining area. Based on the ratio of dynamic to static horizontal tensile deformation and the maximum static horizontal tensile deformation value of the surface, the maximum dynamic horizontal tensile deformation value of the surface of the mining area is calculated. Simultaneously, based on the coal seam thickness and dip angle in the mining area, the maximum surface subsidence value of the mining area is calculated. Using this maximum dynamic horizontal tensile deformation value and maximum surface subsidence value, the impact of near-horizontal wide-strip full-pillar mining on the deformation of surface structures in the mining area is determined. This allows for an accurate assessment of the applicability of the near-horizontal wide-strip full-pillar mining method based on the geological and mining conditions of the mining area, significantly improving its applicability to coal resource mining under structures. Attached Figure Description

[0031] 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.

[0032] Figure 1 This is a flowchart illustrating the method for determining whether a wide strip full-pillar mining method is applicable to near-horizontal coal seams under buildings and structures provided by the present invention.

[0033] Figure 2This is a schematic diagram of the plane coordinate system in the method for determining the applicability of wide strip full pillar mining to near-horizontal coal seams under buildings and structures provided by the present invention;

[0034] Figure 3 This is a schematic diagram of the determination device for wide-strip full-pillar mining of near-horizontal coal seams under buildings provided by the present invention.

[0035] Figure 4 This is a schematic diagram of the physical structure of the electronic device provided by the present invention. Detailed Implementation

[0036] 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.

[0037] In the description of the invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] The following is combined Figures 1-4 This invention describes a method for determining whether a near-horizontal coal seam beneath a building is suitable for wide-strip full-pillar mining.

[0039] Figure 1 This is a flowchart illustrating the method for determining the applicability of wide-strip full-pillar mining to near-horizontal coal seams under structures provided by the present invention. Figure 1 As shown, it includes steps 110, 120 and 130.

[0040] Step 110: Establish a plane coordinate system for the mining area, and perform line integral calculation on the boundary of the mining area in the plane coordinate system to obtain the maximum static horizontal tensile deformation value of the surface of the mining area.

[0041] It should be noted that the most common application of the near-horizontal wide-strip full-pillar mining method for coal seams is in the mining of coal resources in near-horizontal coal seams beneath buildings and structures, such as the mining of protective coal pillars for villages. Evaluation indicators for surface subsidence caused by coal mining include surface subsidence, horizontal movement, horizontal tensile and compressive deformation, tilt, and curvature. Taking the mining of protective coal pillars for villages as an example...

[0042] The most direct manifestation of surface subsidence is the relative rise of the groundwater level. When the subsidence approaches or exceeds the depth of the groundwater level in the area, it will cause excessive dampness or long-term water accumulation in village houses, reducing the strength of the load-bearing structure of the houses and thus affecting their safe habitation. Technically, dewatering measures such as pumping can be taken for houses in waterlogged areas. However, from the perspective of social impact and livability, once the subsidence is too large, approaching the depth of the groundwater level, it is no longer suitable to apply the near-horizontal wide-strip full-pillar mining method for coal seams. Therefore, surface subsidence is one of the key factors to consider in surface subsidence.

[0043] Surface tilt can cause eccentric loads on surface structures, generating additional overturning moments and stresses. For tall structures with small base areas, such as water towers, chimneys, power transmission towers, and wind turbines, surface tilt is a key subsidence factor due to their high center of gravity and must be carefully considered. However, for village houses and other buildings, tilts of level II or lower generally have no impact. Therefore, surface tilt is not a key surface subsidence factor for the applicability of near-horizontal wide-strip full-pillar mining in coal seams.

[0044] Ground surface curvature causes internal forces within buildings and structures. For houses, positive ground surface curvature can cause vertical cracks in areas such as window sills and lintels, and inverted V-shaped cracks in walls near window corners. Negative ground surface curvature can cause horizontal cracks and V-shaped cracks. However, ground surface curvature is generally small and is not considered a critical factor affecting the safe habitation of a building.

[0045] Based on industry experience, when subjected to the same level of ground deformation, horizontal tensile deformation is the most likely to damage a building. Cracks are most likely to occur in weak areas such as doors and windows, and the joints of brick masonry are also easily pulled apart.

[0046] In summary, the key surface subsidence factors affecting buildings and structures under the near-horizontal wide-strip full-pillar mining method include surface subsidence and horizontal deformation. Assuming no water accumulation in villages and other surface areas, horizontal deformation is crucial to the feasibility of using the near-horizontal wide-strip full-pillar mining method under these geological conditions.

[0047] Specifically, the maximum horizontal tensile deformation value of the surface static as described in the embodiments of the present invention refers to the maximum deformation value of the surface horizontal tensile deformation under static conditions that is finally formed along the working face after the mining operation is completed in the mining area.

[0048] In embodiments of the present invention, the mining area refers to the near-horizontal coal seam mining area below the structures. Furthermore, a planar coordinate system for the mining area can be established based on its dimensions.

[0049] Figure 2This is a schematic diagram of the plane coordinate system in the method for determining the applicability of wide-strip full-pillar mining to near-horizontal coal seams under structures provided by the present invention, as shown below. Figure 2 As shown, it can be assumed that the mining area using near-horizontal wide-strip full-pillar mining is a regular rectangle, with dimensions of length d and width l, including four boundary segments L1, L2, L3, and L4, and boundary points A, B, C, and D. A plane coordinate system for the mining area is established with boundary point A as the origin.

[0050] Furthermore, in an embodiment of the present invention, line integral calculation is performed on the boundary of the mining area in the planar coordinate system to obtain the maximum static horizontal tensile deformation value of the surface of the mining area.

[0051] Based on the above embodiments, as an optional embodiment, line integral calculation is performed on the boundary of the mining area in the planar coordinate system to obtain the maximum static horizontal tensile deformation value of the surface of the mining area, including:

[0052] Based on the size of the mining area, determine the position coordinates corresponding to the maximum horizontal tensile deformation along the target coordinate axis in the plane coordinate system;

[0053] From the boundary of the mining area, determine the target boundary that is closest to the location coordinates;

[0054] Line integrals are performed on the target boundary, and the position coordinates are substituted into the line integral calculation of the target boundary to obtain the maximum static horizontal tensile deformation value of the surface of the mining area.

[0055] Specifically, the target coordinate axis direction described in the embodiments of the present invention refers to the coordinate axis direction in the horizontal stretching direction. (Refer to...) Figure 2 As shown, the direction of the target coordinate axis is the X-axis direction.

[0056] The target boundary described in this embodiment of the invention refers to the boundary among all boundaries of the mining area that is closest to the location coordinates, where the location coordinates are the location coordinates corresponding to the maximum horizontal tensile deformation in the direction of the target coordinate axis in the planar coordinate system. (Refer to...) Figure 2 As shown, the target boundary can be the boundary line segment L1.

[0057] Furthermore, based on the size of the mining area, the position coordinates corresponding to the maximum horizontal tensile deformation along the target coordinate axis in the planar coordinate system are determined. Specifically, according to the mining subsidence law, when the size of the mining area is expressed as length d and width l, the position coordinates corresponding to the maximum horizontal tensile deformation in the X direction of the planar coordinate system are the coordinates of point O, which are (-0.4r, l / 2).

[0058] The horizontal tensile deformation value at point O is calculated using the formula for horizontal deformation in the X direction derived from line integrals. This formula can be expressed as:

[0059]

[0060] In the formula, (x0, y0) represents the coordinates of the deformation point, which are ground coordinates; x and y both represent the coordinate values ​​within the mining area, which are underground coordinates; r represents the main influence radius value, which can be expressed in m (meter); Umax represents the maximum horizontal movement value of the ground surface, which can be expressed in mm (millimeters).

[0061] According to the requirements of line integrals, the horizontal tensile deformation value in the X direction needs to be calculated by integrating the four boundary segments L1, L2, L3, and L4 respectively. (Continue referring to...) Figure 2 As shown, both boundary segments L2 and L4 are parallel to the X-axis. When integrating them, since the upper and lower limits of y are the same, the integration result is 0. Therefore, the boundary segments L2 and L4 can be ignored.

[0062] Assuming the working surface is long enough, boundary segment L3 will not affect the horizontal tensile deformation value at point O. Similarly, when the value of d is large enough, i.e., the value of x is large enough, the integral result will approach 0 infinitely. Therefore, to find the maximum horizontal tensile deformation value at point O, it is only necessary to perform integration calculation over the target boundary, i.e., boundary segment L1.

[0063] Optionally, the maximum static horizontal tensile deformation value of the surface in the mining area is determined by the formula... The calculated value is ε. x1max W represents the maximum static horizontal tensile deformation value of the Earth's surface, b represents the horizontal displacement coefficient, and W represents the horizontal displacement coefficient. max represents the maximum surface subsidence value, r represents the main influence radius, and l represents the size parameter of the mining area.

[0064] Specifically, as can be seen from the above, the coordinates of the deformation point O corresponding to the maximum static horizontal tensile deformation value on the ground surface are x0 = -0.4r and y0 = l / 2.

[0065] Substituting the coordinates of point O into the line integral calculation of the target boundary, since the integration order of the line integral is counterclockwise, x is 0, and the upper and lower limits of y are l→0, according to the above formula for the horizontal tensile deformation value in the X direction, we can obtain:

[0066]

[0067] Continuing the simplification calculation, we get:

[0068]

[0069] In the above formula By substitution and integration, and converting it to an error function, we can obtain:

[0070]

[0071] Due to 0.8πe -0.16π =1.520336, taking its approximate value of 1.52. And the maximum horizontal movement value U on the Earth's surface. max =b·W max Therefore, we can further obtain:

[0072]

[0073] The formula for the maximum static horizontal tensile deformation of the surface in the mining area can be expressed as:

[0074]

[0075] In addition, due to the error function When it reaches 2, the error function value When the near-horizontal coal seam wide strip full-pillar mining area reaches full mining activity, the maximum static horizontal tensile deformation value along the strike of the coal pillar working face during coal pillar recovery can be expressed as:

[0076]

[0077] The method of this invention determines the position coordinates corresponding to the maximum horizontal tensile deformation along the target coordinate axis in the planar coordinate system, performs line integral analysis on the target boundary of the mining area, and obtains the static maximum horizontal tensile deformation value of the surface of the mining area. This ensures the accuracy of the calculation results of the static maximum horizontal tensile deformation value of the surface and provides data support for the subsequent calculation of the dynamic maximum horizontal tensile deformation value of the surface.

[0078] Step 120: Based on the ratio of dynamic to static horizontal tensile deformation of the surface and the maximum static horizontal tensile deformation of the surface, determine the maximum dynamic horizontal tensile deformation of the surface in the mining area.

[0079] Specifically, the dynamic-static horizontal tensile deformation ratio of the surface described in the embodiments of the present invention refers to the relationship between the dynamic horizontal tensile deformation of the surface and the final static horizontal tensile deformation during the advancement of the mining face. It can be obtained by analyzing the dynamic surface movement and deformation results of the working face under different time influence coefficients and different advancement speeds.

[0080] The maximum horizontal tensile deformation value of the surface dynamics described in the embodiments of the present invention refers to the maximum deformation value of the surface dynamic horizontal tensile deformation during the advancement of the mining face.

[0081] Optionally, based on the ratio of dynamic to static horizontal tensile deformation of the surface and the maximum static horizontal tensile deformation value of the surface, the maximum dynamic horizontal tensile deformation value of the surface in the mining area is determined, including:

[0082] Substitute the working face mining speed, lithology-related time influence coefficient, and main influence radius of the mining area into the dynamic and static horizontal tensile deformation ratio relationship of the surface to determine the target ratio;

[0083] The maximum horizontal tensile deformation value of the surface in the mining area is obtained by multiplying the static maximum horizontal tensile deformation value of the surface by the target ratio.

[0084] Specifically, the target ratio described in the embodiments of the present invention refers to the ratio between the maximum dynamic horizontal tensile deformation value of the land surface and the maximum static horizontal tensile deformation value of the land surface.

[0085] Optionally, in embodiments of the present invention, the formula for expressing the ratio of dynamic to static horizontal tensile deformation of the earth's surface can be:

[0086]

[0087] In the formula, v represents the working face recovery rate of the mining area; c represents the time influence coefficient related to lithology, which can generally be taken as 20 to 70 / year; and r represents the main influence radius.

[0088] Therefore, by substituting the working face mining speed, the time influence coefficient related to lithology, and the main influence radius of the mining area into the relationship between the dynamic and static horizontal tensile deformation ratio of the surface, the target ratio can be obtained.

[0089] Furthermore, the maximum horizontal tensile deformation value of the surface in the mining area is obtained by multiplying the static maximum horizontal tensile deformation value of the surface with the target ratio.

[0090] Optionally, the formula for calculating the maximum dynamic horizontal tensile deformation value of the surface in the mining area can be expressed as:

[0091]

[0092] Where, ε x2max The maximum horizontal tensile deformation value of the surface dynamics in the mining area is represented by v, the working face mining speed in the mining area is represented by c, the time influence coefficient related to lithology is represented by r, the main influence radius is represented by ξ1, the correction coefficient is generally taken as 0.7 to 0.9, b is the horizontal movement coefficient, and W max This represents the maximum surface subsidence under the condition of full-pillar mining of a wide strip in a near-horizontal coal seam, where l represents the size parameter of the mining area.

[0093] The method of this invention obtains the dynamic and static horizontal tensile deformation ratio of the surface by utilizing the dynamic surface movement and deformation results of the mining face under different time influence coefficients and different advance speeds. This facilitates the effective calculation of the maximum dynamic horizontal tensile deformation value of the surface in the mining area, ensures the accuracy of the calculation results, and provides reliable data support for determining the applicability of the near-horizontal coal seam wide strip full pillar mining method.

[0094] Step 130: Based on the maximum horizontal tensile deformation value of the surface dynamic and the maximum surface subsidence value of the mining area, determine the applicable mining area for the near-horizontal coal seam wide strip full pillar mining method; the maximum surface subsidence value is determined based on the coal seam thickness and dip angle in the mining area.

[0095] Specifically, in the embodiments of the present invention, the maximum surface subsidence value refers to the maximum surface subsidence value under the condition of full-pillar mining of a near-horizontal coal seam in a wide strip, which can be determined based on the coal seam thickness and dip angle in the mining area. Specifically, according to the laws of surface subsidence, under fully mined conditions, the expression for the maximum surface subsidence value can be expressed as:

[0096] W max =qMcosα;

[0097] Under conditions of insufficient mining, the maximum surface subsidence can be expressed as:

[0098] W max =qMncosα;

[0099] In the formula, W max q represents the maximum surface subsidence under the condition of full-pillar mining of a wide strip of near-horizontal coal seam, M represents the coal seam thickness in the mining area, α represents the coal seam dip angle, and n represents the mining motion coefficient.

[0100] Furthermore, when employing the near-horizontal wide-strip full-pillar mining method, taking village protection pillar mining as an example, the surface movement and deformation during the wide-strip mining stage are relatively small, generally controlled within the deformation tolerance of buildings such as village houses. Therefore, the maximum horizontal tensile deformation experienced by the houses should be analyzed primarily during the full-pillar mining stage. Because full-pillar mining fully excavates the area where the protected object is located, the final static horizontal tensile deformation is distributed in the boundary area of ​​the village protection pillar, and the impact of static horizontal tensile deformation on the houses is relatively small.

[0101] The impact on village houses should mainly be considered in terms of the dynamic deformation of the coal pillar working face during its advancement. Therefore, it is crucial to determine the maximum value of this dynamic deformation, namely the maximum horizontal tensile deformation value of the surface. As long as the maximum horizontal tensile deformation value of the surface is lower than the predetermined allowable deformation value of village houses, and there is no water accumulation on the surface, it can be determined that the geological conditions of the mining area under near-horizontal coal seam conditions are suitable for the near-horizontal coal seam wide strip full pillar mining method.

[0102] Therefore, based on the maximum horizontal tensile deformation value of the surface dynamics and the maximum surface subsidence value of the mining area, the applicable mining area for the near-horizontal coal seam wide strip full pillar mining method can be effectively determined.

[0103] Based on the above embodiments, as an optional embodiment, the determination of the applicable mining area for the near-horizontal coal seam wide strip full-pillar mining method is based on the maximum dynamic horizontal tensile deformation value of the surface and the maximum surface subsidence value of the mining area, including:

[0104] When the maximum horizontal tensile deformation value of the surface is less than the allowable deformation value of the surface buildings in the mining area, and the maximum subsidence value of the surface is less than the burial depth of the groundwater level under the mining area, the near-horizontal coal seam wide strip full pillar mining method is determined to be applicable to the mining area.

[0105] Specifically, the allowable deformation value of surface buildings described in the embodiments of the present invention refers to the maximum deformation value that buildings (structures) in the mining area can withstand.

[0106] The burial depth of the groundwater level described in the embodiments of the present invention refers to the burial depth of the groundwater level under the mining area.

[0107] In an embodiment of the present invention, if the maximum dynamic horizontal tensile deformation value of the surface is less than the allowable deformation value of the surface buildings in the mining area, and the maximum surface subsidence value is less than the burial depth of the groundwater level below the mining area, it indicates that the maximum dynamic horizontal tensile deformation value of the surface is the deformation value that the surface buildings in the mining area can withstand, and there will be no water accumulation on the surface. Therefore, it can be determined that the near-horizontal coal seam wide strip full pillar mining method is applicable to the mining area.

[0108] Specifically, provided the mining depth meets the basic requirements, the criteria for determining whether to apply near-horizontal wide-strip full-pillar mining of coal seams to release coal under the structure can be expressed as follows:

[0109]

[0110] In the formula, H represents the burial depth of the groundwater level; ε x2max ε represents the maximum dynamic horizontal tensile deformation value of the ground surface; ε represents the allowable deformation value of surface buildings in the mining area.

[0111] Furthermore, the specific formula for determining whether to apply the wide-strip full-pillar mining method for near-horizontal coal seams to release coal under the structure can be expressed as follows:

[0112]

[0113] Based on this determination formula, it is possible to quickly determine whether the near-horizontal coal seam wide strip full pillar mining method is suitable for releasing coal pillar resources in different mining areas.

[0114] Optionally, if the maximum horizontal tensile deformation value of the surface is not less than the allowable deformation value of the surface buildings in the mining area, or the maximum subsidence value of the surface is not less than the burial depth of the groundwater level, then the method of full-pillar mining of wide strips of near-horizontal coal seams is not applicable to the mining area.

[0115] Specifically, in the embodiments of the present invention, if the maximum dynamic horizontal tensile deformation value of the surface is not less than the allowable deformation value of the surface buildings in the mining area, or the maximum subsidence value of the surface is not less than the burial depth of the groundwater level, it indicates that the maximum dynamic horizontal tensile deformation value of the surface will cause the surface buildings in the mining area to suffer excessive deformation or even damage, or the surface is prone to water accumulation. As long as any of the above conditions are met, it can be determined that the near-horizontal coal seam wide strip full pillar mining method is not applicable to the mining area at this time.

[0116] The method of this invention considers the impact of the maximum dynamic horizontal tensile deformation value of the surface and the maximum surface subsidence value of the mining area on surface structures. It determines whether the maximum dynamic horizontal tensile deformation value of the surface is likely to cause deformation of surface structures and whether water accumulation is likely to occur on the surface. This determines whether the near-horizontal coal seam wide strip full pillar mining method is applicable to the mining area. It can accurately determine the applicability of the near-horizontal coal seam wide strip full pillar mining method based on the geological and mining conditions of the mining area, thereby improving the accuracy of the applicability determination results of the near-horizontal coal seam wide strip full pillar mining method.

[0117] The method for determining whether a near-horizontal coal seam under a building or structure is suitable for wide-strip full-pillar mining, provided in this embodiment of the invention, establishes a plane coordinate system for the mining area by considering the influence of dynamic surface deformation and surface subsidence during the advancement of the mining face, and calculates the maximum static horizontal tensile deformation value of the mining area by performing line integral calculation on the boundary of the mining area in the plane coordinate system. Based on the ratio of dynamic to static horizontal tensile deformation and the maximum static horizontal tensile deformation value, the maximum dynamic horizontal tensile deformation value of the mining area is calculated. Simultaneously, based on the coal seam thickness and dip angle in the mining area, the maximum surface subsidence value of the mining area is calculated. Using this maximum dynamic horizontal tensile deformation value and maximum surface subsidence value, the impact of near-horizontal wide-strip full-pillar mining on the deformation of surface structures in the mining area is determined. This allows for an accurate assessment of the applicability of the near-horizontal wide-strip full-pillar mining method based on the geological and mining conditions of the mining area, significantly improving its applicability to coal resource mining under structures.

[0118] The following describes the determination device for wide-strip full-pillar mining of near-horizontal coal seams under buildings and structures provided by the present invention. The determination device for wide-strip full-pillar mining of near-horizontal coal seams under buildings and structures described below can be referred to in correspondence with the determination method for wide-strip full-pillar mining of near-horizontal coal seams under buildings and structures described above.

[0119] Figure 3 This is a schematic diagram of the determination device for wide-strip full-pillar mining of near-horizontal coal seams under buildings provided by the present invention, as shown in the figure. Figure 3 As shown, it includes:

[0120] The calculation module 310 is used to establish a plane coordinate system for the mining area and perform line integral calculation on the boundary of the mining area in the plane coordinate system to obtain the maximum static horizontal tensile deformation value of the surface of the mining area.

[0121] Processing module 320 is used to determine the maximum dynamic horizontal tensile deformation value of the surface in the mining area based on the ratio of dynamic and static horizontal tensile deformation of the surface and the maximum static horizontal tensile deformation value of the surface.

[0122] The determination module 330 is used to determine the applicable mining area for the near-horizontal coal seam wide strip full pillar mining method based on the maximum horizontal tensile deformation value of the surface dynamic and the maximum surface subsidence value of the mining area; the maximum surface subsidence value is determined based on the coal seam thickness and coal seam dip angle in the mining area.

[0123] The determination device for wide-strip full-pillar mining of near-horizontal coal seams under buildings and structures described in this embodiment can be used to execute the above-described determination method embodiment for wide-strip full-pillar mining of near-horizontal coal seams under buildings and structures. Its principle and technical effect are similar, and will not be repeated here.

[0124] The determination device for wide-strip full-pillar mining of near-horizontal coal seams under buildings provided in this embodiment of the invention establishes a plane coordinate system for the mining area by considering the influence of dynamic surface deformation and surface subsidence during the advancement of the mining face, and performs line integral calculation on the boundary of the mining area in the plane coordinate system to obtain the maximum static horizontal tensile deformation value of the surface of the mining area. Based on the ratio of dynamic and static horizontal tensile deformation of the surface and the maximum static horizontal tensile deformation value of the surface, the maximum dynamic horizontal tensile deformation value of the surface of the mining area is calculated. Simultaneously, based on the coal seam thickness and dip angle in the mining area, the maximum surface subsidence value of the mining area is calculated. Using this maximum dynamic horizontal tensile deformation value and maximum surface subsidence value, the impact of near-horizontal wide-strip full-pillar mining on the deformation of surface structures in the mining area is determined. This allows for an accurate assessment of the applicability of the near-horizontal wide-strip full-pillar mining method based on the geological and mining conditions of the mining area, significantly improving its applicability to coal resource mining under structures.

[0125] Figure 4 This is a schematic diagram of the physical structure of the electronic device provided by the present invention, such as... Figure 4 As shown, the electronic device may include: a processor 410, a communication interface 420, a memory 430, and a communication bus 440, wherein the processor 410, the communication interface 420, and the memory 430 communicate with each other through the communication bus 440. Processor 410 can call logic instructions in memory 430 to execute the determination method for the applicability of wide-strip full-pillar mining to near-horizontal coal seams under structures provided by the above methods. This method includes: establishing a planar coordinate system for the mining area and performing line integral calculations on the boundary of the mining area in the planar coordinate system to obtain the maximum static horizontal tensile deformation value of the surface of the mining area; determining the maximum dynamic horizontal tensile deformation value of the surface of the mining area based on the ratio of dynamic to static horizontal tensile deformation and the maximum static horizontal tensile deformation value; and determining the determination result that the wide-strip full-pillar mining method is applicable to the mining area based on the maximum dynamic horizontal tensile deformation value and the maximum surface subsidence value of the mining area; the maximum surface subsidence value is determined based on the coal seam thickness and dip angle in the mining area.

[0126] Furthermore, the logical instructions in the aforementioned memory 430 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.

[0127] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the determination method for the applicability of wide-strip full-pillar mining to near-horizontal coal seams under structures provided by the above methods. The method includes: establishing a planar coordinate system of the mining area and performing line integral calculation on the boundary of the mining area in the planar coordinate system to obtain the maximum static horizontal tensile deformation value of the surface of the mining area; determining the maximum dynamic horizontal tensile deformation value of the surface of the mining area based on the ratio of dynamic to static horizontal tensile deformation and the maximum static horizontal tensile deformation value; and determining the determination result of the applicability of the wide-strip full-pillar mining method to the mining area based on the maximum dynamic horizontal tensile deformation value and the maximum subsidence value of the surface of the mining area. The maximum subsidence value is determined based on the coal seam thickness and the coal seam dip angle in the mining area.

[0128] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon. When executed by a processor, the computer program implements a method for determining whether a wide-strip full-pillar mining method is applicable to near-horizontal coal seams under structures, as provided by the methods described above. This method includes: establishing a planar coordinate system for the mining area and performing line integral calculations on the boundary of the mining area in the planar coordinate system to obtain the maximum static horizontal tensile deformation value of the surface of the mining area; determining the maximum dynamic horizontal tensile deformation value of the surface of the mining area based on the ratio of static to dynamic horizontal tensile deformation and the maximum static horizontal tensile deformation value; and determining a determination result that the wide-strip full-pillar mining method is applicable to the mining area based on the maximum dynamic horizontal tensile deformation value and the maximum surface subsidence value of the mining area. The maximum surface subsidence value is determined based on the coal seam thickness and dip angle in the mining area.

[0129] 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.

[0130] 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.

[0131] 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 determining whether wide-strip full-pillar mining is suitable for near-horizontal coal seams under buildings or structures, characterized in that, include: A plane coordinate system for the mining area is established, and line integrals are performed on the boundary of the mining area within the plane coordinate system to obtain the maximum static horizontal tensile deformation value of the surface of the mining area. This maximum static horizontal tensile deformation value is obtained using the formula... The calculated result is that, This represents the maximum static horizontal tensile deformation value of the earth's surface. Indicates the horizontal shift coefficient. This represents the maximum subsidence value of the land surface. Indicates the radius of main influence. This indicates the size parameters of the mining area; Based on the ratio of static to dynamic horizontal tensile deformation of the surface and the maximum static horizontal tensile deformation value of the surface, the maximum dynamic horizontal tensile deformation value of the surface in the mining area is determined using the formula. The calculated result is that, This represents the maximum dynamic horizontal tensile deformation value of the surface in the mining area. This indicates the working face recovery rate in the mining area. This represents the time-related influence coefficient associated with lithology. Indicates the radius of main influence. This represents the correction factor. Indicates the horizontal shift coefficient. This represents the maximum subsidence value of the land surface. This indicates the size parameters of the mining area; Based on the maximum horizontal tensile deformation value of the surface dynamics and the maximum surface subsidence value of the mining area, the determination result of whether the near-horizontal coal seam wide strip full pillar mining method is applicable to the mining area is obtained; the maximum surface subsidence value is determined based on the coal seam thickness and coal seam dip angle in the mining area.

2. The method for determining whether wide-strip full-pillar mining is applicable to near-horizontal coal seams under buildings and structures, as described in claim 1, is characterized in that... The maximum static horizontal tensile deformation value of the surface of the mining area is obtained by performing line integral calculation on the boundary of the mining area in the plane coordinate system, including: Based on the size of the mining area, determine the position coordinates corresponding to the maximum horizontal tensile deformation along the target coordinate axis in the planar coordinate system; From the boundary of the mining area, determine the target boundary that is closest to the location coordinates; The target boundary is calculated by line integral, and the position coordinates are substituted into the line integral calculation of the target boundary to obtain the maximum static horizontal tensile deformation value of the surface of the mining area.

3. The method for determining whether wide-strip full-pillar mining is applicable to near-horizontal coal seams under buildings and structures, as described in claim 1, is characterized in that... The determination of the maximum dynamic horizontal tensile deformation value of the surface in the mining area based on the ratio of dynamic to static horizontal tensile deformation and the maximum static horizontal tensile deformation value includes: Substitute the working face mining speed, lithology-related time influence coefficient, and main influence radius of the mining area into the dynamic and static horizontal tensile deformation ratio relationship of the surface to determine the target ratio. The maximum horizontal tensile deformation value of the surface in the mining area is obtained by multiplying the static maximum horizontal tensile deformation value of the surface with the target ratio.

4. The method for determining whether wide-strip full-pillar mining is applicable to near-horizontal coal seams under buildings and structures, as described in claim 1, is characterized in that... Based on the maximum horizontal tensile deformation value of the surface and the maximum surface subsidence value of the mining area, the determination results for the applicability of the near-horizontal coal seam wide strip full-pillar mining method to the mining area are as follows: If the maximum horizontal tensile deformation value of the surface is less than the allowable deformation value of the surface buildings in the mining area, and the maximum subsidence value of the surface is less than the burial depth of the groundwater level under the mining area, then the near-horizontal coal seam wide strip full pillar mining method is determined to be applicable to the mining area. or, If the maximum horizontal tensile deformation value of the surface is not less than the allowable deformation value of the surface buildings in the mining area, or the maximum subsidence value of the surface is not less than the burial depth of the groundwater level, then the near-horizontal coal seam wide strip full-pillar mining method is determined to be unsuitable for the mining area.

5. A determination device for wide-strip full-pillar mining of near-horizontal coal seams under buildings and structures, characterized in that, include: The calculation module is used to establish a planar coordinate system for the mining area and perform line integral calculations on the boundary of the mining area in the planar coordinate system to obtain the maximum static horizontal tensile deformation value of the surface of the mining area. The maximum static horizontal tensile deformation value of the surface of the mining area is obtained through the formula... The calculated result is that, This represents the maximum static horizontal tensile deformation value of the earth's surface. Indicates the horizontal shift coefficient. This represents the maximum subsidence value of the land surface. Indicates the radius of main influence. This indicates the size parameters of the mining area; The processing module is used to determine the maximum dynamic horizontal tensile deformation value of the surface in the mining area based on the ratio of static to dynamic horizontal tensile deformation and the maximum static horizontal tensile deformation value of the surface. The maximum dynamic horizontal tensile deformation value of the surface in the mining area is determined by the formula... The calculated result is that, This represents the maximum dynamic horizontal tensile deformation value of the surface in the mining area. This indicates the working face recovery rate in the mining area. This represents the time-related influence coefficient associated with lithology. Indicates the radius of main influence. This represents the correction factor. Indicates the horizontal shift coefficient. This represents the maximum subsidence value of the land surface. This indicates the size parameters of the mining area; The determination module is used to determine the applicability of the near-horizontal coal seam wide strip full-pillar mining method to the mining area based on the maximum horizontal tensile deformation value of the surface dynamic and the maximum subsidence value of the surface in the mining area; the maximum subsidence value of the surface is determined based on the coal seam thickness and the coal seam dip angle in the mining area.

6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the determination method for wide-strip full-pillar mining applicable to near-horizontal coal seams under structures as described in any one of claims 1 to 4.

7. 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 determination method for wide strip full pillar mining applicable to near-horizontal coal seams under structures as described in any one of claims 1 to 4.

8. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the determination method for wide strip full pillar mining applicable to near-horizontal coal seams under structures as described in any one of claims 1 to 4.

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