Fault waterproof coal pillar design method

Abstract

The invention relates to a fault waterproof coal pillar design method. The method comprises the steps that geomechanical parameters of a coal seam are obtained; and analyzing various hydrogeological conditions influencing waterproof coal pillar design, and calculating waterproof coal pillar design parameters under different hydrogeological conditions by using a preset program according to the geomechanical parameters of the coal seam. According to the method, the waterproof coal pillar design parameters under different hydrogeological conditions are calculated by using the preset program, so that the calculation efficiency and accuracy are improved, and the possibility of human errors is reduced. By comprehensively considering the specific hydrogeological conditions of the coal seam area, the design parameters of the waterproof coal pillar can be calculated more accurately, and potential safety hazards caused by inaccurate estimation can be reduced. By means of the accurate waterproof coal pillar design, water in a water-bearing layer or a water guiding fault can be effectively prevented from rushing into the coal mine working face, the risk of safety accidents such as mine water inrush is greatly reduced, and the safety of coal mine production is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of waterproof coal pillar installation, and in particular to a design method for a fault waterproof coal pillar. Background Art

[0002] During coal mining, faults destroy the continuity and integrity of coal strata and easily communicate the hydraulic connection between aquifers and coal seams, which can easily cause coal mine water disasters. Therefore, it is very necessary to carry out exploration and prevention of water-conducting faults during coal mining.

[0003] In order to prevent the occurrence of water inrush accidents in coal mines, when encountering water-bearing or water-conducting faults during the mining process, it is often required to analyze and study the actual situation and reserve certain water-proof coal (rock) pillars according to safety needs. In the prior art, the design of water-proof coal (rock) pillars for water-bearing or water-conducting faults is mostly carried out with reference to relevant empirical formulas or evaluation experience. In the past, when estimating them, they were mostly calculated manually; due to the large statistical workload, cumbersome calculations, slow calculations, and easy errors, it is not conducive to coal mine safety and the protection of coal resources. Summary of the invention

[0004] In view of this, it is necessary to provide a fault waterproof coal pillar design method to solve the above-mentioned defects of the prior art.

[0005] In order to solve the above problems, in a first aspect, an embodiment of the present invention provides a fault waterproof coal pillar design method, comprising:

[0006] Obtain geomechanical parameters of coal seams;

[0007] The various hydrogeological conditions that affect the design of waterproof coal pillars are analyzed, and according to the geomechanical parameters of the coal seam, the design parameters of waterproof coal pillars under different hydrogeological conditions are calculated using a preset program.

[0008] Preferably, the geomechanical parameters of the coal seam include at least: the maximum height of the water-conducting fracture zone, the fault dip, the rock formation collapse angle, and the hydrostatic pressure borne by the waterproof coal pillar.

[0009] Preferably, the analysis of various hydrogeological conditions affecting the design of waterproof coal pillars includes:

[0010] The influence of the structural position relationship of coal seams, aquifers, faults and water-conducting fracture zones on the design of waterproof coal pillars is analyzed, and various hydrogeological conditions affecting the design of waterproof coal pillars are obtained.

[0011] Preferably, the various hydrogeological conditions affecting the design of waterproof coal pillars include:

[0012] The top of the aquifer is higher than the maximum height of the water-conducting fracture zone; where an aquifer is a rock formation that can store and transmit groundwater, and a water-conducting fracture zone is a belt-like area in the rock where groundwater flows due to faults, joints or other fissures;

[0013] The coal seams are located above aquifers;

[0014] The maximum height of the water-conducting fracture zone is higher than the aquifer in the hanging wall of the fault.

[0015] Preferably, the calculation of the design parameters of the waterproof coal pillar under different hydrogeological conditions includes:

[0016] When the top surface of the aquifer is higher than the upper limit of the highest water-conducting fracture zone, the calculation formula for the width of the waterproof coal pillar is:

[0017] L=L1+L2+L3=Hacscθ+HLcotθ+HLcotδ

[0018] Where, L is the width of the waterproof coal pillar, L1, L2, L3 are the widths of each segment of the waterproof coal pillar; HL is the maximum height of the water-conducting fracture zone; θ is the fault inclination; δ is the rock formation collapse angle; Ha is the height of the safety coal pillar;

[0019] Where Ha = (p / Ts) + 10

[0020] Where p is the hydrostatic pressure borne by the waterproof coal pillar; Ts is the critical water inrush coefficient.

[0021] Preferably, the calculation of the design parameters of the waterproof coal pillar under different hydrogeological conditions also includes:

[0022] When the coal seam is located above the aquifer and the fault conducts water, the calculation formula for the width of the waterproof coal pillar is:

[0023] L=Ha / sinθ≥20m

[0024] When the coal seam is located above the aquifer and the fault conducts water, the establishment of the waterproof coal pillar should consider whether the impermeable layer at the bottom of the coal seam can withstand the pressure of the lower aquifer and the pressure of the fault in the direction along the coal seam;

[0025] When the coal seam is located above the aquifer and the fault does not conduct water, ensure that the minimum distance from the intersection of the aquifer top and the fault plane to the coal seam floor is greater than the height of the safety coal pillar and not less than 20m.

[0026] Preferably, the calculation of the design parameters of the waterproof coal pillar under different hydrogeological conditions also includes:

[0027] When the upper limit of the highest water-conducting fracture zone is higher than the aquifer on the upper wall of the fault, the calculation formula for the width of the waterproof coal pillar is:

[0028] L=L1+L2+L3=Ha(sinδ-cosδcotθ)+(Hacosδ+M)(cotθ+cotδ)≥20m.

[0029] Where M is the height of the aquifer surface in the upper wall of the fault above the bottom of the coal seam in the lower wall.

[0030] Preferably, the method further comprises:

[0031] Calculate the thickness of the safety aquiclude according to the geomechanical parameters of the coal seam; wherein the thickness of the safety aquiclude refers to the thickness of the complete rock layer that separates the water from the bottom plate of the coal seam to the top surface of the aquifer;

[0032] The calculation formula for the thickness of the safety waterproof layer is:

[0033]

[0034] In the formula, t is the thickness of the safety waterproof layer; S is the width of the tunnel floor; γ is the average weight of the floor waterproof layer; Kp is the average tensile strength of the floor waterproof layer; p is the hydrostatic pressure borne by the waterproof coal pillar.

[0035] In a second aspect, the present invention further provides an electronic device, including a memory and a processor, wherein:

[0036] The memory is used to store programs;

[0037] The processor is coupled to the memory and is used to execute the program stored in the memory to implement the steps in the fault waterproof coal pillar design method as described in the embodiment of the first aspect of the present invention.

[0038] In a third aspect, the present invention further provides a computer-readable storage medium for storing computer-readable programs or instructions, which, when executed by a processor, can implement the steps in the fault waterproof coal pillar design method as described in the embodiment of the first aspect of the present invention.

[0039] Compared with the prior art, the fault waterproof coal pillar design method provided by the present invention has the following beneficial effects:

[0040] 1) The present invention can more accurately calculate the design parameters of the waterproof coal pillar by comprehensively considering the specific hydrogeological conditions of the coal seam area, which helps to reduce the safety hazards caused by inaccurate estimates.

[0041] 2) The present invention utilizes a preset program to calculate the design parameters of the waterproof coal pillar under different hydrogeological conditions, thereby improving the calculation efficiency and accuracy and reducing the possibility of human error.

[0042] 3) The present invention can effectively prevent water in the aquifer or water-conducting fault from gushing into the coal mine working face through precise waterproof coal pillar design, greatly reducing the risk of safety accidents such as mine water inrush and ensuring the safety of coal mine production. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A flow chart of the fault waterproof coal pillar design method provided by the present invention;

[0044] Figure 2 is a diagram for setting up a waterproof coal pillar when the top surface of the aquifer is higher than the upper limit of the highest water-conducting fracture zone;

[0045] Figure 3 is a diagram of the layout of the waterproof coal pillar when the coal seam is located above the aquifer and the fault conducts water;

[0046] FIG4 is a diagram of the arrangement of a waterproof coal pillar when the coal seam is located above the aquifer and the fault does not conduct water;

[0047] Figure 5 This is a structural block diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0048] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0049] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0050] In order to prevent the occurrence of water inrush accidents in coal mines, when encountering water-bearing or water-conducting faults during the mining process, it is often required to analyze and study the actual situation and reserve certain water-proof coal (rock) pillars according to safety needs. In the prior art, the design of water-proof coal (rock) pillars for water-bearing or water-conducting faults is mostly carried out with reference to relevant empirical formulas or evaluation experience. In the past, when estimating them, they were mostly calculated manually; due to the large statistical workload, cumbersome calculations, slow calculations, and easy errors, it is not conducive to coal mine safety and the protection of coal resources.

[0051] In view of this, the present invention provides a fault waterproof coal pillar design method, which can more accurately calculate the design parameters of the waterproof coal pillar by comprehensively considering the specific hydrogeological conditions of the coal seam area, and help reduce the safety hazards caused by inaccurate estimation. The following will be explained and introduced through multiple embodiments.

[0052] Figure 1 The flow chart of the fault waterproof coal pillar design method provided by the present invention. Figure 1 As shown, the fault waterproof coal pillar design method includes steps S1 to S2, wherein:

[0053] Step S1, obtaining geomechanical parameters of the coal seam.

[0054] Specifically, this embodiment analyzes the impact of conductive and water-bearing faults on coal strata during coal mining, and collects geomechanical parameters of the coal strata.

[0055] Among them, the analysis of the influence of conducting and water-bearing faults on coal-rock strata is as follows: that is, when faults exist in the top and bottom plates of the mining working face, the depth of the water-conducting fracture zone of the rock mass in the fault fracture zone can be increased. Faults exist in coal-rock strata, destroying the integrity of the strata. Faults divide the coal-rock strata into blocks of different sizes, greatly reducing the compressive strength of the rock mass. The degree of rock damage near faults with different fault distances is different, but the compressive strength is reduced more. Faults destroy the integrity of coal seams, and sometimes cause direct contact between coal seams and aquifers near the fault zone. When the excavation working face exposes the water in the fault aquifer, it will enter the tunnel and cause water inrush accidents. The water conductivity of faults is mainly related to the formation mechanism of faults. Normal faults are tensile faults, formed by tension, with loose fracture zones on the fracture surface and large porosity, which is easy to conduct water. Water inrush accidents are more likely to occur when normal faults are exposed during mining. Reverse faults are compressive faults, mostly formed by compression pressure. The fractured zone of the fault surface is usually dense, with low porosity, and is not easy to conduct water. Generally, the possibility of water inrush accidents is small. However, if it is affected by later tectonic movements and changes, there is a great possibility of mine water inrush disasters. In addition, the water conductivity of the fault is also related to the fault dip angle and the properties of the rocks on the upper and lower plates of the fault. The smaller the dip angle of the fault, the worse its water conductivity. If the upper and lower plates of the fault are both hard sandstone bodies, the water conductivity is strong; if the upper and lower plates of the fault are both weak mudstone bodies, the fault fractured zone is easy to be filled and the water conductivity is weak.

[0056] The geomechanical parameters of coal seams include at least: the maximum height of the water-conducting fracture zone, the fault dip, the rock collapse angle, and the hydrostatic pressure borne by the waterproof coal pillar. The water-conducting fracture zone refers to the belt-shaped area in the rock where groundwater flows due to faults, joints or other cracks.

[0057] Step S2, analyzing various hydrogeological conditions that affect the design of waterproof coal pillars, and calculating the design parameters of waterproof coal pillars under different hydrogeological conditions using a preset program according to the geomechanical parameters of the coal seam.

[0058] Among them, the design parameters of the waterproof coal pillar may include the width L of the waterproof coal pillar and the thickness t of the safety waterproof layer.

[0059] Specifically, under normal circumstances, if different waterproof coal pillar design schemes are not considered under different hydrogeological conditions, the width L of the waterproof coal pillar can be calculated according to the following empirical formula:

[0060]

[0061] In the formula, L is the width of the waterproof coal pillar; K is the safety factor, generally 2 to 5; N is the thickness of the coal seam or the mining height; p is the hydrostatic pressure borne by the waterproof coal pillar, in MPa; Kp is the tensile strength of the coal, in MPa.

[0062] In this embodiment, the various hydrogeological conditions that affect the design of the waterproof coal pillar are analyzed, and the influence of the structural position relationship of the coal seam, aquifer, fault and water-conducting fracture zone on the design of the waterproof coal pillar is analyzed. The various hydrogeological conditions that affect the design of the waterproof coal pillar include the following three hydrogeological conditions:

[0063] First, the top of the aquifer is higher than the maximum height of the water-conducting fracture zone; an aquifer refers to a rock formation that can store and transmit groundwater.

[0064] Second, the coal seams are located above aquifers;

[0065] Third, the maximum height of the water-conducting fracture zone is higher than the aquifer on the upper wall of the fault.

[0066] In the embodiment of the present invention, it is described how to design a reasonable waterproof coal pillar under different geological and hydrogeological conditions to ensure the safety of coal mining and prevent water inrush accidents. In the embodiment of the present invention, C++ language programming is used to calculate the design parameters of the waterproof coal pillar, and the calculation is fast and accurate, and the operation is simple and easy.

[0067] Figure 2 is a diagram of the waterproof coal pillar when the top surface of the aquifer is higher than the upper limit of the highest water-conducting fracture zone. Referring to Figure 2(a) and Figure 2(b), at this time, the coal seam is in contact with the strong aquifer or water-conducting fault and is partially covered.

[0068] In step S2, the calculation of design parameters of waterproof coal pillars under different hydrogeological conditions includes:

[0069] Step S21, when the top surface of the aquifer is higher than the upper limit of the highest water-conducting fracture zone, the calculation formula for the width of the waterproof coal pillar is:

[0070] L=L1+L2+L3=Hacscθ+HLcotθ+HLcotδ (2)

[0071] In the formula, L is the width of the waterproof coal pillar, L1, L2, and L3 are the widths of each segment of the waterproof coal pillar respectively; HL is the maximum height of the water-conducting fracture zone; θ is the fault inclination; δ is the rock collapse angle; Ha is the height of the safe coal pillar; the Ha value should be determined based on the actual observation data of the mine, that is, by summarizing the geological and hydrogeological data of water inrush and safe mining in this mining area during mining near the fault, and calculating the ratio of the water pressure (p) to the thickness of the waterproof coal pillar (N).

[0072] The Ha value can also be calculated according to the following formula:

[0073] Ha= (p / Ts)+10 (3)

[0074] Where p is the hydrostatic pressure borne by the waterproof coal pillar; Ts is the critical water inrush coefficient.

[0075] If the mining area does not have an actual water inrush coefficient, reference can be made to data from other mining areas. However, when selecting, a series of factors should be considered, including the lithology of the aquiclude, physical and mechanical properties, tunnel span or working face empty roof distance, coal mining method, and roof control method.

[0076] Step S22, when the coal seam is located above the aquifer and the fault conducts water, the installation of the waterproof coal pillar should consider pressure in two directions: one is whether the impermeable layer at the bottom of the coal seam can withstand the pressure of the lower aquifer, and the other is the pressure of the fault in the direction along the coal seam.

[0077] When considering the bottom pressure, the minimum distance (vertical distance) between the coal seam floor and the fault plane should be greater than the calculated value of the height of the safety coal pillar (Ha) and should not be less than 20m. Figure 3 is a diagram of the waterproof coal pillar when the coal seam is located above the aquifer and the fault conducts water.

[0078] When the coal seam is located above the aquifer and the fault conducts water, the calculation formula for the width of the waterproof coal pillar is:

[0079] L= Ha / sinθ≥20m (4)

[0080] Figure 4 is a diagram for setting a waterproof coal pillar when the coal seam is located above the aquifer and the fault does not conduct water. In this embodiment, when the coal seam is located above the aquifer and the fault does not conduct water, the minimum distance between the intersection of the top surface of the aquifer and the fault surface to the bottom plate of the coal seam is ensured to be greater than the height of the safety coal pillar and not less than 20m.

[0081] Step S23, when the upper limit of the highest water-conducting fracture zone is higher than the aquifer on the upper wall of the fault, the calculation formula for the width of the waterproof coal pillar is:

[0082] L=L1+L2+L3=Ha(sinδ-cosδcotθ)+(Hacosδ+M)(cotθ+cotδ)≥20m (5)

[0083] Where M is the height of the aquifer surface above the coal seam floor of the lower plate. In geology, a fault is a structure in the earth's crust where rocks or rock layers undergo relative displacement along the fracture surface. For an inclined fault, the rock blocks above the fault plane are called the hanging plate. When the rock layers of the upper plate of the fault contain groundwater, this part of the rock layers is called the aquifer of the upper plate of the fault. In coal geology, the coal seam floor refers to the rock layer directly beneath the coal seam. In fault structures, the coal seam floor below the fault plane is called the coal seam floor of the lower plate.

[0084] In this embodiment, the fault waterproof coal pillar design method also includes:

[0085] The thickness of the safety aquiclude is calculated based on the geomechanical parameters of the coal seam, wherein the thickness of the safety aquiclude refers to the thickness of the complete rock layer that separates the water from the bottom of the coal seam to the top of the aquifer.

[0086] The calculation formula for the thickness of the safety waterproof layer is:

[0087]

[0088] In the formula, t is the thickness of the safety waterproof layer; S is the width of the tunnel floor; γ is the average weight of the floor waterproof layer; Kp is the average tensile strength of the floor waterproof layer; p is the hydrostatic pressure borne by the waterproof coal pillar.

[0089] Compared with the prior art, the fault waterproof coal pillar design method provided by the present invention has the following beneficial effects:

[0090] 1) The present invention utilizes a preset program to calculate the design parameters of the waterproof coal pillar under different hydrogeological conditions, thereby improving the calculation efficiency and accuracy and reducing the possibility of human error.

[0091] 2) The present invention can more accurately calculate the design parameters of the waterproof coal pillar by comprehensively considering the specific hydrogeological conditions of the coal seam area, which helps to reduce the safety hazards caused by inaccurate estimates.

[0092] 3) The present invention can effectively prevent water in the aquifer or water-conducting fault from gushing into the coal mine working face through precise waterproof coal pillar design, greatly reducing the risk of safety accidents such as mine water inrush and ensuring the safety of coal mine production.

[0093] In a preferred embodiment of the present invention, the present invention uses C++ language to compile a calculation program, and uses a preset program to calculate the design parameters of the waterproof coal pillar under different hydrogeological conditions.

[0094] Specifically, the computing environment includes:

[0095] ①Operating system: Windows XP, Windows 7 or newer operating systems.

[0096] ②Hardware system: capable of running the above system software.

[0097] The present invention uses C++ language to pre-compile five subroutines, including:

[0098] The first subroutine: the calculation procedure of the width of the waterproof coal pillar in formula (1);

[0099] The second subprogram: the calculation procedure of the width of the waterproof coal pillar when the top surface of the aquifer is higher than the upper limit of the highest water-conducting fracture zone in formula (2) (3);

[0100] The third subroutine: the calculation procedure of the width of the waterproof coal pillar when the coal seam is located above the aquifer in formula (4);

[0101] The fourth subroutine: the calculation procedure of the width of the waterproof coal pillar when the maximum height of the water-conducting fracture zone in formula (5) is higher than the aquifer on the hanging wall of the fault;

[0102] The fifth subroutine: the calculation procedure of the thickness of the safety waterproof layer in formula (6).

[0103] Figure 5 The structural block diagram of the electronic device provided by the present invention is as follows: Figure 5 As shown, the present invention also provides an electronic device, and the electronic device 500 can be a computing device such as a mobile terminal, a desktop computer, a notebook, a palm computer, and a server. The electronic device 500 includes a processor 501 and a memory 502, wherein the memory 502 stores a fault waterproof coal pillar design program 505.

[0104] In some embodiments, the memory 502 may be an internal storage unit of a computer device, such as a hard disk or memory of the computer device. In other embodiments, the memory 502 may also be an external storage device of a computer device, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the computer device. Furthermore, the memory 502 may also include both an internal storage unit of a computer device and an external storage device. The memory 502 is used to store application software and various types of data installed on the computer device, such as program codes for installing the computer device. The memory 502 may also be used to temporarily store data that has been output or is to be output. In one embodiment, when the fault waterproof coal pillar design program 505 is executed by the processor 501, the following steps are implemented:

[0105] Obtain geomechanical parameters of coal seams;

[0106] The various hydrogeological conditions that affect the design of waterproof coal pillars are analyzed, and according to the geomechanical parameters of the coal seam, the design parameters of waterproof coal pillars under different hydrogeological conditions are calculated using a preset program.

[0107] In some embodiments, the processor 501 may be a central processing unit (CPU), a microprocessor or other data processing chip, used to run program codes or process data stored in the memory 502, such as executing a fault waterproof coal pillar design program.

[0108] This embodiment also provides a computer-readable storage medium, on which a fault waterproof coal pillar design program is stored. When the fault waterproof coal pillar design program is executed by a processor, the following steps are implemented:

[0109] Obtain geomechanical parameters of coal seams;

[0110] The various hydrogeological conditions that affect the design of waterproof coal pillars are analyzed, and according to the geomechanical parameters of the coal seam, the design parameters of waterproof coal pillars under different hydrogeological conditions are calculated using a preset program.

[0111] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fault waterproof coal pillar design method, characterized in that: include: Obtain geomechanical parameters of coal seams; The various hydrogeological conditions that affect the design of waterproof coal pillars are analyzed, and according to the geomechanical parameters of the coal seam, the design parameters of waterproof coal pillars under different hydrogeological conditions are calculated using a preset program.

2. The fault waterproof coal pillar design method according to claim 1 is characterized in that: The geomechanical parameters of the coal seam include at least: the maximum height of the water-conducting fracture zone, the fault inclination, the rock formation collapse angle and the hydrostatic pressure borne by the waterproof coal pillar.

3. The fault waterproof coal pillar design method according to claim 2 is characterized in that: The analysis includes various hydrogeological conditions that affect the design of waterproof coal pillars, including: The influence of the structural position relationship of coal seams, aquifers, faults and water-conducting fracture zones on the design of waterproof coal pillars is analyzed, and various hydrogeological conditions affecting the design of waterproof coal pillars are obtained.

4. The fault waterproof coal pillar design method according to claim 3 is characterized in that: The various hydrogeological conditions that affect the design of waterproof coal pillars include: The top of the aquifer is higher than the maximum height of the water-conducting fracture zone; where an aquifer is a rock formation that can store and transmit groundwater, and a water-conducting fracture zone is a belt-like area in the rock where groundwater flows due to faults, joints or other fissures; The coal seams are located above aquifers; The maximum height of the water-conducting fracture zone is higher than the aquifer in the hanging wall of the fault.

5. The fault waterproof coal pillar design method according to claim 4 is characterized in that: The calculation of waterproof coal pillar design parameters under different hydrogeological conditions includes: When the top surface of the aquifer is higher than the upper limit of the highest water-conducting fracture zone, the calculation formula for the width of the waterproof coal pillar is: L=L1+L2+L3=Hacscθ+HLcotθ+HLcotδ Where, L is the width of the waterproof coal pillar, L1, L2, L3 are the widths of each segment of the waterproof coal pillar; HL is the maximum height of the water-conducting fracture zone; θ is the fault inclination; δ is the rock formation collapse angle; Ha is the height of the safety coal pillar; Where Ha = (p / Ts) + 10 Where p is the hydrostatic pressure borne by the waterproof coal pillar; Ts is the critical water inrush coefficient.

6. The fault waterproof coal pillar design method according to claim 4 is characterized in that: The calculation of the design parameters of the waterproof coal pillar under different hydrogeological conditions also includes: When the coal seam is located above the aquifer and the fault conducts water, the calculation formula for the width of the waterproof coal pillar is: L=Ha / sinθ≥20m When the coal seam is located above the aquifer and the fault conducts water, the establishment of the waterproof coal pillar should consider whether the impermeable layer at the bottom of the coal seam can withstand the pressure of the lower aquifer and the pressure of the fault in the direction along the coal seam; When the coal seam is located above the aquifer and the fault does not conduct water, ensure that the minimum distance from the intersection of the aquifer top and the fault plane to the coal seam floor is greater than the height of the safety coal pillar and not less than 20m.

7. The fault waterproof coal pillar design method according to claim 4 is characterized in that: The calculation of the design parameters of the waterproof coal pillar under different hydrogeological conditions also includes: When the upper limit of the highest water-conducting fracture zone is higher than the aquifer on the upper wall of the fault, the calculation formula for the width of the waterproof coal pillar is: L=L1+L2+L3=Ha(sinδ-cosδcotθ)+(Hacosδ+M)(cotθ+cotδ)≥20m. Where M is the height of the aquifer surface in the upper wall of the fault above the bottom of the coal seam in the lower wall.

8. The fault waterproof coal pillar design method according to claim 1, characterized in that: The method further comprises: Calculate the thickness of the safety aquiclude according to the geomechanical parameters of the coal seam; wherein the thickness of the safety aquiclude refers to the thickness of the complete rock layer that separates the water from the bottom plate of the coal seam to the top surface of the aquifer; The calculation formula for the thickness of the safety waterproof layer is: In the formula, t is the thickness of the safety waterproof layer; S is the width of the tunnel floor; γ is the average weight of the floor waterproof layer; Kp is the average tensile strength of the floor waterproof layer; p is the hydrostatic pressure borne by the waterproof coal pillar.

9. An electronic device, It is characterized in that comprising a memory and a processor, wherein: The memory is used to store programs; The processor is coupled to the memory and is used to execute the program stored in the memory to implement the steps in the fault waterproof coal pillar design method described in any one of claims 1 to 8 above.

10. A computer-readable storage medium, characterized in that: Used to store computer-readable programs or instructions, which, when executed by a processor, can implement the steps in the fault waterproof coal pillar design method described in any one of claims 1 to 8 above.

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