A method, equipment, medium and product for in-situ restoration of aquifers in mining-affected areas

Abstract

The present invention discloses an in-situ restoration method, equipment, medium and product for aquifers in mining-affected areas, and relates to the field of mining subsidence. The method comprises: modeling based on the acquired geological and hydrological data containing the occurrence information of the overburden aquifer, and obtaining numerical simulation results under different working face parameter combination conditions; establishing a boundary function expression of the water-conducting fracture zone caused by mining on the coal pillar side according to the geological and hydrological data and the numerical simulation results; determining the intersection position of the water-conducting fracture zone and the aquifer according to the boundary function expression of the water-conducting fracture zone caused by mining on the coal pillar side; generating a grouting instruction for the plugging position according to the intersection position; determining the time for reconstruction of the aquiclude and the filling area of ​​the grouting filling zone; generating a grouting instruction for the aquiclude according to the filling area of ​​the grouting filling zone; and generating a destruction instruction for the plugging position after the reconstruction of the aquiclude is completed. The present invention can prevent additional subsidence and the loss of mine water resources, thereby protecting the aquifer and the surface ecological environment.

Description

Technical Field

[0001] The invention relates to the field of mining subsidence, and in particular to an in-situ recovery method, equipment, medium and product for aquifer in a mining-affected zone. Background Art

[0002] With the progress of the times and the development of industry, the ecological environment construction of mining areas has become a focus of attention. Long-term mining activities have led to many mining areas facing problems such as resource depletion and environmental degradation, which have seriously affected economic and social development. Especially in the process of coal mining, the goaf formed will cause the overburden to lose support, causing surface subsidence, leading to changes in the underground rock structure and topography, and then affecting the surface ecological environment and the safety of buildings (structures).

[0003] Aquifers themselves are crucial to the ecological and environmental protection of mining areas. First of all, aquifers are an important part of the mining area ecosystem, maintaining the stability of vegetation growth, animal habitats and underground biodiversity. Effective protection of aquifers can avoid groundwater level decline and water pollution, ensure the sustainable use of water resources, and reduce the risk of surface subsidence and other geological disasters. In addition, well-protected aquifers help maintain the integrity and ecological balance of the ecosystem around the mining area and promote the sustainable development of human settlements. Therefore, formulating reasonable protection and restoration measures for aquifers in mining-affected areas is particularly important and is the key to ensuring the long-term health of the mining area's ecological environment and sustainable development of resources.

[0004] At present, there are two main methods for the protection and utilization of mine water resources in China. One is the water-saving coal mining technology for in-situ protection of aquifers, that is, to maintain the natural state of the aquifer as much as possible during the mining process, and to reduce the height of the water-conducting fracture zone through technical means such as face filling mining, strip mining, limited thickness mining and overburden separation grouting mining to ensure the integrity and stability of the aquifer. However, these technologies are often costly and have high technical costs, so the promotion of technology is limited.

[0005] The other is the coal-water co-mining technology that focuses on "groundwater utilization". This technology is to store groundwater resources that have been affected by mining activities in a situ manner, that is, to reuse groundwater resources that have been affected by mining by building underground water reservoirs in coal mines, recharging groundwater in different layers, and utilizing water storage in subsidence areas. Although these methods can effectively recycle and utilize water resources in theory, their actual application is greatly limited due to the high requirements for safety and environmental protection. Summary of the invention

[0006] The purpose of the present invention is to provide a method, equipment, medium and product for in-situ restoration of aquifers in mining-affected areas, which can prevent additional subsidence and loss of mine water resources, thereby protecting the aquifers and the surface ecological environment.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] In a first aspect, the present invention provides an in-situ recovery method for an aquifer in a mining-affected area, the in-situ recovery method for an aquifer in a mining-affected area comprising:

[0009] Modeling is performed based on the acquired geological and hydrological data including the storage information of the overburden aquifer to obtain numerical simulation results under different working face parameter combinations; the geological and hydrological data include: the thickness and layer height of the aquifer above the goaf, the location and size of the goaf, the overburden lithology, the water volume of the aquifer and the lateral water pressure; the working face parameters include mining width, post-mining and mining depth.

[0010] Based on the geological and hydrological data and the numerical simulation results, a boundary function expression of the mining-induced water-conducting fracture zone on the side of the coal pillar is established.

[0011] According to the boundary function expression of the water-conducting fracture zone caused by mining on the coal pillar side, the intersection position of the water-conducting fracture zone and the aquifer is determined; the intersection position is the blocking position of the aquifer.

[0012] A blocking position grouting instruction is generated according to the intersection position; the blocking position grouting instruction is used to implement grouting at the blocking position.

[0013] Determine the timing of reconstruction of the waterproof layer and the filling area of ​​the grouting filling zone; the filling area includes: curtain grouting holes and internal grouting holes; the curtain grouting holes are arranged on both sides of the filling area; the internal grouting holes are arranged in the middle of the filling area.

[0014] According to the filling area of ​​the grouting filling zone, a waterproof layer grouting instruction is generated; the waterproof layer grouting instruction is used to implement grouting on the waterproof layer.

[0015] When the reconstruction of the aquiclude is completed, a blocking position destruction instruction is generated; the blocking position destruction instruction is used to destroy the blocking position, so that water from the aquifers on both sides flows into the aquifer above the working surface, restoring the original underground overburden layer structure and water resource ecological water level.

[0016] Optionally, the boundary function expression of the water-conducting fracture zone caused by mining on the side of the coal pillar is:

[0017]

[0018] Among them, x is the horizontal distance from the target point on one side of the goaf to the coordinate origin, y is the vertical distance from the target point on one side of the goaf to the coordinate origin, z is the distance from the target point on one side of the goaf to the coordinate origin, Y is the height of the water-conducting fracture zone vertically upward from the target point, f is the Proctor hardness coefficient of the rock formation, M is the mining thickness, H is the mining depth, and D is the mining width.

[0019] Optionally, according to the boundary function expression of the water-conducting fissure zone on the coal pillar side, determine the intersection position of the water-conducting fissure zone and the aquifer, specifically including:

[0020] When h < h3, there is no intersection position.

[0021] When h3 < h < h2 + h3, according to the boundary function expression of the water-conducting fissure zone on the coal pillar side, determine the intersection position of the water-conducting fissure zone and the bedrock aquifer.

[0022] When h2 + h3 < h < h1 + h2 + h3, according to the boundary function expression of the water-conducting fissure zone on the coal pillar side, determine the intersection position of the water-conducting fissure zone and the unconsolidated aquifer.

[0023] Where h is the height of the water-conducting fissure zone, h1 is the height from the ground surface to the unconsolidated aquifer, h2 is the height from the unconsolidated aquifer to the bedrock aquifer, and h3 is the height from the bedrock aquifer to the goaf.

[0024] Optionally, according to the intersection position, generate a grouting instruction for the plugging position, specifically including:

[0025] According to the intersection position, determine the plugging area; the plugging area is a cuboid; the height of the plugging area is the height of the aquifer, the length of the plugging area is calculated from the area on the water pressure side of the plugging layer and the force generated by the water on the plugging area, and the width of the plugging area is calculated from the total bearing capacity, compressive strength and safety factor of the plugging area material.

[0026] According to the plugging area, determine the grouting holes in the plugging area; the grouting holes in the plugging area are used for grouting.

[0027] Generate a grouting instruction for the plugging position according to the grouting holes in the plugging area.

[0028] Optionally, determine the timing of reconstituting the water-resisting layer, specifically including:

[0029] Calculate the surface subsidence value.

[0030] Judge whether the surface subsidence value exceeds a preset threshold to obtain a judgment result; the preset threshold is a value determined according to the maximum surface subsidence value.

[0031] If the judgment result is no, return to the step of calculating the surface subsidence value.

[0032] If the judgment result is yes, determine the timing of reconstituting the water-resisting layer.

[0033] Optionally, the calculation formula for the maximum surface subsidence value is:

[0034] W max = qMcosβ;

[0035] Among them, W max is the maximum surface subsidence value, q is the subsidence coefficient, M is the mining thickness, and β is the coal seam inclination.

[0036] Optionally, generating a waterproof layer grouting instruction according to the filling area of ​​the grouting filling belt specifically includes:

[0037] Determine the width of the grouting filling zone and the spacing between the grouting filling zones; the width of the grouting filling zone is calculated by the mining thickness and mining depth; the spacing between the grouting filling zones is calculated by the mining depth.

[0038] The curtain grouting holes and the internal grouting holes are determined according to the width and spacing of the grouting filling belt.

[0039] According to the curtain grouting holes and the internal grouting holes, a waterproof layer grouting instruction is generated.

[0040] In a second aspect, the present invention provides a computer device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement any of the above-described methods for in-situ recovery of aquifers in a mining-affected zone.

[0041] In a third aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the above-described methods for in-situ recovery of aquifers in a mining-affected zone.

[0042] In a fourth aspect, the present invention provides a computer program product, comprising a computer program, which, when executed by a processor, implements any of the above-mentioned methods for in-situ recovery of aquifers in a mining-affected zone.

[0043] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0044] The present invention provides an in-situ restoration method, equipment, medium and product for aquifers in a mining-affected zone. The method comprises the following steps: modeling is performed based on the acquired geological and hydrological data including the occurrence information of the overburden aquifer, and numerical simulation results are obtained under different working face parameter combination conditions. The boundary function expression of the water-conducting fracture zone of the coal pillar side is constructed according to the geological and hydrological data and the numerical simulation results. The intersection position of the water-conducting fracture zone and the aquifer is determined. According to the intersection position, grouting is performed at the plugging position to construct a plugging area, and the independent structure of the aquifer is recreated. By destroying the plugging area at the plugging position, the water from the aquifers on both sides flows into the aquifer above the working face, and the original underground overburden stratification structure and the water resource ecological water level are restored, thereby preventing additional subsidence and water resource loss, and achieving the purpose of effectively protecting the aquifer and the surface ecological environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 A schematic flow chart of an in-situ recovery method for an aquifer in a mining-affected zone provided in accordance with an embodiment of the present invention.

[0047] Figure 2 A schematic diagram of three types of spatial overlapping relationships between the water-conducting fracture zone of the working face and the aquifer provided in one embodiment of the present invention.

[0048] Figure 3 A schematic diagram of constructing blocking areas on both sides of an aquifer provided in one embodiment of the present invention.

[0049] Figure 4 A schematic diagram of the distribution of grouting holes and the grouting sequence of a grouting filling zone along the direction of a coal seam according to a strip grouting method provided in one embodiment of the present invention.

[0050] Figure 5 A schematic diagram of the structure of a computer device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0053] In an exemplary embodiment, Figure 1 As shown, a method for in-situ recovery of aquifers in mining-affected areas is provided. In an embodiment of the present invention, the method comprises the following steps S1 to S7. Among them:

[0054] S1: Modeling is performed based on the acquired geological and hydrological data including the storage information of the overburden aquifer to obtain numerical simulation results under different working face parameter combinations; the geological and hydrological data include: the thickness and layer height of the aquifer above the goaf, the location and size of the goaf, the overburden lithology, the water volume of the aquifer and the lateral water pressure; the working face parameters include mining width, post-mining and mining depth.

[0055] S2: Based on the geological and hydrological data and the numerical simulation results, a boundary function expression of the water-conducting fracture zone on the side of the coal pillar is established.

[0056] S3: Determine the intersection position of the water-conducting fracture zone and the aquifer according to the boundary function expression of the water-conducting fracture zone caused by mining on the coal pillar side; the intersection position is the plugging position of the aquifer.

[0057] S4: generating a blocking position grouting instruction according to the intersection position; the blocking position grouting instruction is used to implement grouting at the blocking position.

[0058] S5: Determine the timing of reconstruction of the waterproof layer and the filling area of ​​the grouting filling zone; the filling area includes: curtain grouting holes and internal grouting holes; the curtain grouting holes are arranged on both sides of the filling area; the internal grouting holes are arranged in the middle of the filling area.

[0059] S6: Generate a waterproof layer grouting instruction according to the filling area of ​​the grouting filling zone; the waterproof layer grouting instruction is used to implement grouting on the waterproof layer.

[0060] S7: After the reconstruction of the aquiclude is completed, a blocking position destruction instruction is generated; the blocking position destruction instruction is used to destroy the blocking position, so that water from the aquifers on both sides flows into the aquifer above the working surface, thereby restoring the original underground overburden stratification structure and water resource ecological water level.

[0061] Implement the above-mentioned steps S1 to S7, determine the shape of the water-conducting fracture zone and the intersection position with the aquifer by constructing a boundary function expression of the water-conducting fracture zone caused by mining on the coal pillar side, perform grouting filling at the intersection position, construct a sealing area, and reconstruct the independent structure of the aquifer. After the reconstruction of the aquifer is completed, destroy the sealing area to allow water from the aquifers on both sides to flow into the aquifer above the working face, restore the original underground overburden stratification structure and water resource ecological water level, thereby preventing additional subsidence and water resource loss, and achieving the purpose of effectively protecting the aquifer and the surface ecological environment.

[0062] As an alternative implementation, in step S1, through means such as borehole exploration and on-site investigation, the hydrogeological data containing the occurrence information of overlying aquifers (generally bedrock aquifers and unconsolidated aquifers) is measured and collected. The hydrogeological data includes: the geological conditions of the mining area and relevant parameters of the aquifers, specifically including: the thickness and horizon height of the aquifer above the goaf, the location and size of the goaf, the lithology of the overlying rock, the water volume of the aquifer, and the lateral water pressure, etc.

[0063] Based on the hydrogeological data of the mining area, a model is established, and numerical simulation experiments are carried out under different parameter combinations such as the mining width, mining thickness, and mining depth of the working face, and the numerical simulation results under different working face parameter combinations are obtained.

[0064] As an alternative implementation, in step S2, the influencing factors affecting the height of the water-conducting fissure zone mainly include the mining width, mining thickness, mining depth of the working face, and the Proctor hardness coefficient of the upper rock layer, etc. According to the empirical formula for judging the height of the water-conducting fissure zone given in the mining subsidence theory and the morphological data of the measured water-conducting fissure zone for reference, numerical simulations are carried out on each influencing factor of the water-conducting fissure zone and the water-conducting fissure zone, and the obtained results are compared with the measured data, and a boundary function expression of the water-conducting fissure zone on the coal pillar side under mining is fitted. Taking the bottom side of one side of the goaf as the coordinate origin, this expression can be expressed as:

[0065]

[0066] Where x is the horizontal distance from the target point on one side of the goaf to the coordinate origin, y is the vertical distance from the target point on one side of the goaf to the coordinate origin, z is the distance from the target point on one side of the goaf to the coordinate origin, Y is the height of the water-conducting fissure zone vertically upward at the target point position. When the value of x on one side is x > 0, the value of x on the other side is x < 0, f is the Proctor hardness coefficient of the rock layer, and the rock layer is divided into three categories: soft, medium-hard, and hard. When f < 4, it is a soft rock layer; when 4 ≤ f < 8, it is a medium-hard rock layer; when f > 8, it is a hard rock layer, M is the mining thickness, H is the mining depth, and D is the mining width. The parameters in the polynomial are determined by inverting numerical simulation or on-site measured data.

[0067] As Figure 2 shown, in step S3, it specifically includes:

[0068] S31: When h < h3, there is no intersection position.

[0069] S32: When h3 < h < h2 + h3, according to the boundary function expression of the water-conducting fissure zone on the coal pillar side under mining, determine the intersection position of the water-conducting fissure zone and the bedrock aquifer.

[0070] S33: When h2 + h3 < h < h1 + h2 + h3, according to the expression of the boundary function of the water-conducting fissure zone on the coal pillar side, determine the intersection position of the water-conducting fissure zone and the unconsolidated aquifer.

[0071] Among them, h is the height of the water-conducting fissure zone, h1 is the height from the ground surface to the unconsolidated aquifer, h2 is the height from the unconsolidated aquifer to the bedrock aquifer, and h3 is the height from the bedrock aquifer to the goaf.

[0072] It should be noted that when h < h3, the water-conducting fissure zone has little influence on the aquifer, and there is no need to construct an independent structure between the aquifers; when h3 < h < h2 + h3, the water-conducting fissure zone has already affected the bedrock aquifer, but has not yet affected the unconsolidated aquifer. According to the height of the bedrock aquifer and using the expression of the boundary function of the water-conducting fissure zone on the coal pillar side, determine the intersection position of the water-conducting fissure zone and the bedrock aquifer; when h2 + h3 < h < h1 + h2 + h3, the water-conducting fissure zone has already affected both the rock and soil aquifers. Correspondingly, use the same method to determine the intersection position of the water-conducting fissure zone and the unconsolidated aquifer.

[0073] When h > h3, it will affect the aquifer. In order to prevent the water in the aquifers on both sides from flowing into the working face and affecting production, grouting is carried out at the intersection position of the water-conducting fissure zone and the aquifer.

[0074] In another exemplary embodiment of the present invention, in step S4, it specifically includes:

[0075] S41: According to the intersection position, determine the plugging area; the plugging area is a cuboid; the height of the plugging area is the height of the aquifer, the length of the plugging area is calculated from the area of the side of the plugging layer subjected to water pressure and the force generated by the water on the plugging area, and the width of the plugging area is calculated from the total bearing capacity, compressive strength and safety factor of the plugging area material. Among them, the width and length of the plugging area are determined in the following manner.

[0076] The size of the plugging area is related to the water column pressure on one side of the plugging area. The water column pressure generated by the underground aquifer is usually called pore water pressure. The geological layer above the aquifer will generate additional vertical pressure on the aquifer, and the lateral pressure on the plugging area is relatively small. Therefore, only the pore water pressure needs to be considered. The pore water pressure of the aquifer can be measured through stratified groundwater observation wells and stratified piezometers. The force F generated by the water on the plugging layer can be calculated from the water pressure and the area of the plugging layer. The area of the plugging layer and the force generated by the water on the plugging area can be calculated by the following formula:

[0077] S = L × H 含 (3);

[0078] Among them, S is the area of the side of the plugging layer subjected to water pressure (m2 ), L is the length of the plugging layer (m), H 含 is the thickness of the aquifer (m).

[0079] F = P × S (4);

[0080] Among them, F is the pressure exerted by water on the plugging layer (N), and P is the measured pore water pressure (Pa).

[0081] The material selected for the blocking area is usually concrete, and the compressive strength of concrete is usually 20MPa, that is, it can withstand a force of 20,000,000N per square meter. Usually, a safety factor SF needs to be set, and SF is usually 2. Combined with the width of the concrete, the actual total bearing capacity of the concrete is:

[0082]

[0083] Where, σ is the total bearing capacity of concrete (N), F 混 is the compressive strength of concrete, d is the width of the concrete sealing area, and SF is the safety factor.

[0084] In summary, it is sufficient to ensure that the pressure exerted by water on the blocking area is less than the total bearing capacity of the concrete used to construct the blocking area. In actual design, because the actual situation of the blocking area is more complicated and is affected by multiple factors such as safety factor and actual bearing capacity of concrete, the precise width usually needs to be determined by combining the above multiple factors.

[0085] S42: Determine grouting holes in the plugging area according to the plugging area; the grouting holes in the plugging area are used for grouting.

[0086] like Figure 3 As shown, the scope of the plugging area is determined, and a hole is drilled in the middle of the plugging area. When only one aquifer is affected, a hole can be drilled and grouting can be performed just above the center; when both rock and soil aquifers are affected, a straight line is connected between the centers of the two plugging areas, extending to point B on the ground surface, and a straight line is connected from point C, the center of the lowest plugging area, vertically upward to point A on the ground surface, and the line connecting points AB, with the angle between AC and BC being α. Formula (6) is used to obtain the position of point B, which is the grouting hole in the plugging area.

[0087] l AB = l AC tanα (6);

[0088] Among them, l AC is the straight-line distance from the center of the blocking area to the ground surface when two aquifers are affected; l AB is the distance from point A to the surface borehole location when two aquifers are affected.

[0089] S43: Generate a grouting instruction for the plugging position according to the grouting holes in the plugging area.

[0090] At point B, drill holes from the ground along the inclination direction to the sealing area and inject grouting, first injecting into the bedrock aquifer and then injecting into the loose layer aquifer.

[0091] Next, the working face is mined, and after the aquifer in the blocking area is drained, the water-blocking layer is reconstructed by using a strip grouting filling method. In step S5, the following steps are specifically included:

[0092] S51: Calculate the ground subsidence value.

[0093] S52: Determine whether the surface subsidence value exceeds a preset threshold value, and obtain a determination result; the preset threshold value is a value determined according to the maximum surface subsidence value.

[0094] S53: If the judgment result is no, return to the step of calculating the ground subsidence value.

[0095] S54: If the judgment result is yes, then determine the timing of rebuilding the waterproof layer.

[0096] In this embodiment, after the mining work and drainage are completed, when the ground subsidence reaches 90% of the maximum subsidence value, the overburden movement enters the recession period, and the aquiclude begins to be reconstructed. The maximum subsidence value of this area can be calculated by the following formula:

[0097] W max =qMcosβ (7);

[0098] Among them, W max is the maximum surface subsidence value, q is the subsidence coefficient, which can be obtained by inverse calculation of the adjacent working face, M is the mining thickness, and β is the coal seam inclination.

[0099] In another exemplary embodiment of the present invention, in step S6, specifically including:

[0100] S61: Determine the width of the grouting filling zone and the spacing between the grouting filling zones; the width of the grouting filling zone is calculated by the mining thickness and the mining depth; the spacing between the grouting filling zones is calculated by the mining depth.

[0101] The method of reconstructing the aquiclude is the strip grouting method. Within the treatment range, multiple grouting filling belts are arranged at intervals along the direction of the coal seam or along the inclination of the coal seam. Curtain grouting holes and internal grouting holes are arranged in the filling area of ​​the filling belt. The grouting filling belt is strip-shaped. According to the mining conditions of the mining area, the width a and spacing b of the grouting filling belt are determined, and the formula is as follows:

[0102] a=0.028k a ·M1·H (8);

[0103] Among them, k a is the correction coefficient, M1 is the average mining thickness of the filling area, H is the mining depth, k a The value of k is determined according to the average thickness M1 of the filling area: when M1≤1.3, then k a The value of is 4; when 1.3<M1≤3.5, then k a The value of is 3; when 3.5<M1≤8.0, then k a The value of is 2; when M>8.0, k a The value of M1 is 1; the unit of M1 is meter.

[0104]

[0105] S62: Determine the curtain grouting holes and the internal grouting holes according to the width and spacing of the grouting filling belt

[0106] As an optional implementation, Figure 4 As shown, the curtain grouting holes are arranged on both sides of the filling area, the aperture of the curtain grouting holes is 110mm, the grouting diffusion radius is 5-10m, the hole spacing along the belt is 10-20m, and the distance from the boundary of the filling area is 5-10m. The internal grouting holes are arranged in the middle of the filling area, the aperture of the internal grouting holes is 110mm, the grouting diffusion radius is 15-20m, the hole spacing between two adjacent internal grouting holes is 30-40m, and the distance from the grouting belt of the curtain grouting holes is 20-25m.

[0107] S63: Generate waterproof layer grouting instructions according to the curtain grouting holes and the internal grouting holes.

[0108] According to the grouting instruction of the aquiclude, the grouting equipment performs grouting into the grouting filling zone of the aquiclude through the curtain grouting holes and the internal grouting holes, and the filling body formed by the grouting and the rock and soil of the aquiclude form a structural support together.

[0109] In another exemplary embodiment of the present invention, in step S7, specifically including:

[0110] Through the holes drilled in the previous grouting to create the plugging area, relevant instruments are used to destroy the created plugging area, allowing the water from the aquifers on both sides to flow into the aquifer above the working face, restoring the original underground overburden stratification structure and water resource ecological level, and protecting the surface ecological environment of the working area.

[0111] Compared with the prior art, the present invention proposes a new boundary function expression of the water-conducting fracture zone in the side mining of the coal pillar; and the present invention minimizes the transformation of the stratum while ensuring a good water-isolating effect, which is more conducive to the protection of the surface ecological living environment.

[0112] The present invention also provides an application scenario, which applies the above-mentioned in-situ recovery method for aquifers in mining-affected areas. Specifically: The in-situ recovery method for aquifers in mining-affected areas provided in this embodiment can be applied in mining scenarios. The mining scenario includes a geological and hydrological data acquisition link, a plugging area construction link, and an aquiclude reconstruction link. Based on the acquired geological and hydrological data, a boundary function expression of the water-conducting fracture zone caused by mining on the coal pillar side can be established. The morphology of the water-conducting fracture zone and the intersection position with the aquifer are determined by the boundary function expression of the water-conducting fracture zone caused by mining on the coal pillar side. Grouting and filling are performed at the intersection position to construct a plugging area and reconstruct the independent structure of the aquiclude, thereby preventing additional subsidence and water resource loss, and achieving the purpose of effectively protecting the aquifer and the surface ecological environment.

[0113] In an exemplary embodiment, a computer device is provided. The computer device may be a server or a terminal. The internal structure diagram thereof may be as follows: Figure 5 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store geological and hydrological data containing the storage information of the overburden aquifer. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for in-situ recovery of aquifers in a mining-affected area is implemented.

[0114] Those skilled in the art will understand that Figure 5 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present invention, and does not constitute a limitation on the computer device to which the solution of the present invention is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0115] In an exemplary embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the above-mentioned method embodiments are implemented when the processor executes the computer program.

[0116] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, and when the computer program is executed by a processor, the above-mentioned method embodiments are implemented.

[0117] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the above-mentioned method embodiments are implemented.

[0118] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in the present invention are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0119] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided by the present invention can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0120] The database involved in each embodiment provided by the present invention may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided by the present invention may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0121] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0122] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for in-situ restoration of aquifers in mining-affected areas, characterized in that: The in-situ restoration method for the aquifer in the mining-influenced area includes: Based on the obtained geological and hydrogeological data containing the occurrence information of the overlying aquifer, a model is established to obtain the numerical simulation results under different combinations of working face parameters; the geological and hydrogeological data includes: the thickness and horizon height of the aquifer above the goaf, the position and size of the goaf, the lithology of the overlying rock, the water volume and lateral water pressure of the aquifer; the working face parameters include the mining width, the post-mining situation, and the mining depth. According to the geological and hydrogeological data and the numerical simulation results, a boundary function expression of the water-conducting fracture zone on the coal pillar side during mining is established. According to the boundary function expression of the water-conducting fracture zone on the coal pillar side during mining, the intersection position of the water-conducting fracture zone and the aquifer is determined; the intersection position is the plugging position of the aquifer. According to the intersection position, a grouting instruction for the plugging position is generated; the grouting instruction for the plugging position is used to perform grouting on the plugging position. Determine the timing of the reconstitution of the aquitard and the filling area of the grouting filling zone; the filling area includes: curtain grouting holes and internal grouting holes; the curtain grouting holes are arranged on both sides of the filling area; the internal grouting holes are arranged in the middle position of the filling area. According to the filling area of the grouting filling zone, a grouting instruction for the aquitard is generated; the grouting instruction for the aquitard is used to perform grouting on the aquitard. When the reconstitution of the aquitard is completed, a destruction instruction for the plugging position is generated; the destruction instruction for the plugging position is used to destroy the plugging position, so that the water in the aquifers on both sides flows into the aquifer above the working face, restoring the original underground overlying rock stratified structure and the ecological water level of the water resources. The boundary function expression of the water-conducting fracture zone on the coal pillar side during mining is: Where x is the horizontal distance from a target point on one side of the goaf to the coordinate origin, y is the vertical distance from the target point on one side of the goaf to the coordinate origin, z is the distance from the target point on one side of the goaf to the coordinate origin, Y is the height of the water-conducting fracture zone vertically upward at the target point position, f is the Proctor hardness coefficient of the rock stratum, M is the mining thickness, H is the mining depth, and D is the mining width. According to the boundary function expression of the water-conducting fracture zone on the coal pillar side during mining, determining the intersection position of the water-conducting fracture zone and the aquifer specifically includes: When h < h3, there is no intersection position. When h3 < h < h2 + h3, according to the boundary function expression of the water-conducting fracture zone on the coal pillar side during mining, determine the intersection position of the water-conducting fracture zone and the bedrock aquifer. When h2 + h3 < h < h1 + h2 + h3, according to the boundary function expression of the water-conducting fracture zone on the coal pillar side during mining, determine the intersection position of the water-conducting fracture zone and the unconsolidated aquifer. Where h is the height of the water-conducting fracture zone, h1 is the height from the ground surface to the unconsolidated aquifer, h2 is the height from the unconsolidated aquifer to the bedrock aquifer, and h3 is the height from the bedrock aquifer to the goaf. Determining the timing of the reconstitution of the aquitard specifically includes: Calculating the surface subsidence value. Judging whether the surface subsidence value exceeds a preset threshold to obtain a judgment result; the preset threshold is a value determined according to the maximum surface subsidence value. If the judgment result is no, return to the step of calculating the surface subsidence value. If the judgment result is yes, determine the timing of the reconstitution of the aquitard. The calculation formula for the maximum surface subsidence value is: IN max =qMcosβ; Among them, W max is the maximum surface subsidence value, q is the subsidence coefficient, M is the mining thickness, and β is the coal seam inclination.

2. The in-situ recovery method for aquifers in mining-affected areas according to claim 1, characterized in that: According to the intersection position, a plugging position grouting instruction is generated, specifically including: According to the intersection position, the blocking area is determined; the blocking area is a rectangular parallelepiped; the height of the blocking area is the height of the aquifer, the length of the blocking area is calculated by the area of ​​the side of the blocking layer under water pressure and the force generated by water on the blocking area, and the width of the blocking area is calculated by the total bearing capacity, compressive strength and safety factor of the blocking area material; According to the blocking area, a grouting hole in the blocking area is determined; the grouting hole in the blocking area is used for grouting; According to the grouting holes in the plugging area, a grouting instruction for the plugging position is generated.

3. The in-situ recovery method for aquifers in mining-affected areas according to claim 1, characterized in that: According to the filling area of ​​the grouting filling belt, a waterproof layer grouting instruction is generated, specifically including: Determine the width of the grouting filling zone and the spacing of the grouting filling zones; the width of the grouting filling zone is calculated by the mining thickness and the mining depth; the spacing of the grouting filling zones is calculated by the mining depth; Determine the curtain grouting holes and the internal grouting holes according to the width and spacing of the grouting filling belt; According to the curtain grouting holes and the internal grouting holes, a waterproof layer grouting instruction is generated.

4. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the in-situ recovery method for aquifers in a mining-affected zone according to any one of claims 1 to 3.

5. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the in-situ recovery method of an aquifer in a mining-affected zone described in any one of claims 1 to 3 is implemented.

6. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the in-situ recovery method of an aquifer in a mining-affected zone described in any one of claims 1 to 3 is implemented.

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