A coal mining face water inflow prediction method, system, electronic device and medium

Abstract

The present application relates to a kind of coal face water inflow prediction method, system, electronic equipment and medium, specifically related to the field of mine hydrogeology and mining engineering.The method includes determining the water level difference of aquifer and adjacent aquifer and the mining simulation model of mining area according to the drilling column chart of mining area;According to the mining simulation model, the fracture height and the horizontal distance of the fracture distance of pumping test aquifer are obtained by coal seam mining simulation;According to the fracture height and horizontal distance, the drilling position and rock sample of pumping test are obtained;The vertical permeation speed is obtained by using triaxial servo instrument to operate the rock sample with surrounding pressure;According to the vertical permeation speed, the constant flow of pumping test is obtained;According to the drilling position, constant flow and water level difference, the drawdown of stable aquifer is obtained by non-complete well pumping test;According to the drawdown of stable aquifer, the water inflow is obtained.The present application makes the prediction result of water inflow of mining area more accurate, and reduces cost.

Description

Technical Field

[0001] This invention relates to the field of mine hydrogeology and mining engineering technology, and in particular to a method, system, electronic equipment and medium for predicting water inflow in coal mining faces. Background Technology

[0002] Pumping tests are the primary experiments for determining the permeability coefficient, a crucial parameter of aquifers. In coal mining areas, they are widely used to predict water inflow at the coal face, which is vital for coal mining operations threatened by water hazards. However, existing pumping tests in coal mining areas are not significantly different from those in non-coal mining areas, leading to the following problems:

[0003] (1) Existing aquifer pumping experiments are not representative. Aquifers are heterogeneous in the vertical direction. Therefore, the selection of drawdown depth in existing pumping experiments is relatively arbitrary. The sampling points are not combined with the water filling pattern of coal mining. The resulting permeability coefficient has a large error in predicting the water inflow in the coal mining area.

[0004] (2) Coal mining causes the aquifer to fill with water in a short time, but the traditional pumping test has a long time span and is prone to a large amount of overflow replenishment. At this time, the permeability coefficient obtained is not applicable to the prediction of water inflow.

[0005] (3) Traditional pumping experiments require three different drop depths, which takes a long time and is more expensive. Summary of the Invention

[0006] The purpose of this invention is to provide a method, system, electronic device and medium for predicting water inflow in coal mining faces, which can make the prediction results of water inflow in coal mining areas more accurate and reduce costs.

[0007] To achieve the above objectives, the present invention provides the following solution:

[0008] A method for predicting water inflow in a coal mining face includes:

[0009] The water level difference between the target aquifer and adjacent aquifers in the target area and the mining simulation model of the coal mining area are determined based on the borehole columnar section of the coal mining area; the target area is the area in the coal mining area where the pumping experiment is to be conducted.

[0010] Based on the mining simulation model, the fracture height of the aquifer and the horizontal distance from the fracture to the opening were obtained in the coal seam mining simulation of the pumping experiment.

[0011] The drilling location and rock sample for the pumping experiment were obtained based on the fracture height of the aquifer in the pumping experiment and the horizontal distance between the fracture and the opening.

[0012] Under a preset infiltration water pressure, a triaxial servo instrument is used to perform a confining pressure operation on the rock sample to obtain the vertical infiltration velocity of the rock sample after the confining pressure is released after the peak.

[0013] The constant flow rate of the pumping experiment was obtained based on the vertical permeability of the rock sample after the peak unloading confining pressure.

[0014] Based on the borehole location of the pumping experiment, the constant flow rate of the pumping experiment, and the water level difference between the aquifer in the target area and the adjacent aquifer, a non-complete well pumping experiment was conducted in the target area to obtain the stabilized aquifer drawdown.

[0015] The aquifer permeability coefficient is obtained based on the drawdown of the stabilized aquifer.

[0016] The water inflow at the coal face of the mining area is obtained using the large well method based on the aquifer permeability coefficient.

[0017] Optionally, the step of using a triaxial servo instrument to apply confining pressure to the rock sample under a preset permeation water pressure, and obtaining the vertical permeation velocity of the rock sample after unloading the confining pressure following the peak, specifically includes:

[0018] The average unit weight of the overlying soil and rock mass and the thickness of the overlying soil and rock mass were obtained from the rock sample.

[0019] The confining pressure value is calculated based on the average unit weight of the overlying soil and rock mass of the rock sample and the thickness of the overlying soil and rock mass of the rock sample.

[0020] Based on the confining pressure value, a triaxial servo instrument is used to apply confining pressure to the rock sample under a preset infiltration water pressure to obtain the vertical infiltration velocity of the rock sample after the confining pressure is released following the peak.

[0021] Optionally, obtaining the constant flow rate for the pumping experiment based on the vertical seepage velocity of the rock sample after the peak unloading confining pressure specifically includes:

[0022] According to the formula Calculate the constant flow rate of the pumping experiment, where Q represents the constant flow rate of the pumping experiment, x represents the diameter of the filter tube in the pumping experiment, and v represents the vertical infiltration velocity of the rock sample after the peak is relieved of confining pressure.

[0023] A coal mining face water inflow prediction system includes:

[0024] The determination module is used to determine the water level difference between the aquifer and adjacent aquifers in the target area and the mining simulation model of the coal mining area based on the borehole columnar section of the coal mining area; the target area is the area in the coal mining area where the pumping experiment is to be conducted.

[0025] The parameter calculation module is used to simulate coal seam mining based on the mining simulation model to obtain the fracture height and horizontal distance of the fracture from the aquifer in the pumping experiment.

[0026] The borehole location and rock sample determination module is used to determine the borehole location and rock sample of the pumping experiment based on the fracture height of the aquifer in the pumping experiment and the horizontal distance of the fracture from the opening.

[0027] The vertical infiltration velocity determination module is used to perform a confining pressure operation on the rock sample using a triaxial servo instrument under a preset infiltration water pressure, and to obtain the vertical infiltration velocity of the rock sample after the confining pressure is released after the peak.

[0028] A constant flow rate calculation module is used to obtain the constant flow rate of the pumping experiment based on the vertical permeability of the rock sample after the peak unloading confining pressure.

[0029] The aquifer drawdown determination module is used to obtain the stable aquifer drawdown by conducting a non-complete well pumping experiment in the target area based on the borehole location of the pumping experiment, the constant flow rate of the pumping experiment, and the water level difference between the aquifer in the target area and the adjacent aquifer.

[0030] The aquifer permeability coefficient calculation module is used to obtain the aquifer permeability coefficient based on the stabilized aquifer drawdown.

[0031] The water inflow prediction module is used to obtain the water inflow of the coal mining face in the coal mining area using the large well method based on the permeability coefficient of the aquifer.

[0032] Optionally, the vertical infiltration rate determination module specifically includes:

[0033] The acquisition unit is used to acquire the average unit weight of the overlying rock and soil of the rock sample and the thickness of the overlying rock and soil of the rock sample;

[0034] The confining pressure calculation unit is used to calculate the confining pressure value based on the average unit weight of the overlying rock and soil of the rock sample and the thickness of the overlying rock and soil of the rock sample.

[0035] The vertical permeability calculation unit is used to apply confining pressure to the rock sample under a preset permeable water pressure using a triaxial servo instrument, based on the confining pressure value, to obtain the vertical permeability of the rock sample after the confining pressure is released following the peak.

[0036] Optionally, the constant flow calculation module specifically includes:

[0037] The constant flow calculation unit is used to calculate the flow rate according to the formula. Calculate the constant flow rate of the pumping experiment, where Q represents the constant flow rate of the pumping experiment, x represents the diameter of the filter tube in the pumping experiment, and v represents the vertical infiltration velocity of the rock sample after the peak is relieved of confining pressure.

[0038] An electronic device, comprising:

[0039] A memory and a processor, the memory for storing a computer program, the processor for running the computer program to cause the electronic device to perform the coal face water inflow prediction method as described above.

[0040] A computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for predicting water inflow at a coal mining face.

[0041] According to specific embodiments provided by the present invention, the following technical effects are disclosed: The present invention obtains the fracture height and horizontal distance from the fracture to the opening of the aquifer in a pumping experiment based on a mining simulation model; the borehole location and rock sample for the pumping experiment are obtained based on the fracture height and horizontal distance from the fracture to the opening of the aquifer in the pumping experiment; a triaxial servo instrument is used to apply confining pressure to the rock sample under a preset seepage pressure to obtain the vertical seepage velocity of the rock sample after the pressure is released following the peak; the constant flow rate of the pumping experiment is obtained based on the vertical seepage velocity of the rock sample after the pressure is released following the peak; and the constant flow rate of the pumping experiment is obtained based on the borehole location and the constant flow rate of the pumping experiment. The water level difference between the target aquifer and adjacent aquifers in the target area is used to conduct incomplete well pumping experiments to obtain the stabilized aquifer drawdown. The aquifer permeability coefficient is obtained based on the stabilized aquifer drawdown. The water inflow of the coal mining face is obtained using the large well method based on the aquifer permeability coefficient. The location of the pumping test borehole is determined based on the fracture height and the horizontal distance of the fracture from the opening hole in the aquifer. The constant flow rate is determined based on the vertical seepage velocity of the rock sample after the peak pressure is released. The use of incomplete well pumping experiments based on the water level difference between the target aquifer and adjacent aquifers makes the prediction of the water inflow in the coal mining area more accurate and reduces costs. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 A flowchart of a method for predicting water inflow in a coal mining face, provided in an embodiment of the present invention;

[0044] Figure 2 The flowchart illustrates the actual processing of the coal mining face water inflow prediction method provided in this embodiment of the invention. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] This invention provides a method for predicting water inflow in coal mining faces, such as... Figure 1 As shown, it includes:

[0048] Step 101: Determine the water level difference between the target aquifer and adjacent aquifers, as well as the mining simulation model of the coal mining area, based on the borehole columnar section of the coal mining area; the target area is the area within the coal mining area where the pumping experiment will be conducted.

[0049] Step 102: Based on the mining simulation model, perform coal seam mining simulation to obtain the fracture height of the aquifer and the horizontal distance of the fracture from the opening in the pumping experiment.

[0050] Step 103: Obtain the borehole location and rock sample for the pumping experiment based on the fracture height of the aquifer in the pumping experiment and the horizontal distance between the fracture and the opening.

[0051] Step 104: Under a preset permeation water pressure, a triaxial servo instrument is used to perform a confining pressure operation on the rock sample to obtain the vertical permeation velocity of the rock sample after the confining pressure is released following the peak.

[0052] Step 105: Obtain the constant flow rate for the pumping experiment based on the vertical permeability of the rock sample after the peak unloading confining pressure.

[0053] Step 106: Based on the borehole location of the pumping experiment, the constant flow rate of the pumping experiment, and the water level difference between the aquifer in the target area and the adjacent aquifer, a non-complete well pumping experiment is conducted in the target area to obtain the stabilized aquifer drawdown.

[0054] Step 107: Obtain the aquifer permeability coefficient based on the drawdown of the stabilized aquifer.

[0055] Step 108: Obtain the water inflow of the coal mining face in the coal mining area using the large well method based on the aquifer permeability coefficient.

[0056] As an optional implementation, the step of using a triaxial servo instrument to apply confining pressure to the rock sample under a preset permeation water pressure, and obtaining the vertical permeation velocity of the rock sample after unloading the confining pressure following the peak, specifically includes:

[0057] The average unit weight of the overlying soil and rock mass and the thickness of the overlying soil and rock mass are obtained.

[0058] The confining pressure value is calculated based on the average unit weight of the overlying soil and rock mass of the rock sample and the thickness of the overlying soil and rock mass of the rock sample.

[0059] Based on the confining pressure value, a triaxial servo instrument is used to apply confining pressure to the rock sample under a preset infiltration water pressure to obtain the vertical infiltration velocity of the rock sample after the confining pressure is released following the peak.

[0060] As an optional implementation, obtaining the constant flow rate of the pumping experiment based on the vertical permeability of the rock sample after the peak unloading confining pressure specifically includes:

[0061] According to the formula Calculate the constant flow rate of the pumping experiment, where Q represents the constant flow rate of the pumping experiment, x represents the diameter of the filter tube in the pumping experiment, and v represents the vertical infiltration velocity of the rock sample after the peak is relieved of confining pressure.

[0062] In view of the above method, this invention provides a coal mining face water inflow prediction system, including:

[0063] The determination module is used to determine the water level difference between the aquifer and the adjacent aquifer in the target area and the mining simulation model of the coal mining area based on the borehole columnar section of the coal mining area; the target area is the area in the coal mining area where the pumping experiment is to be conducted.

[0064] The parameter calculation module is used to simulate coal seam mining based on the mining simulation model to obtain the fracture height and horizontal distance of the fracture from the aquifer in the pumping experiment.

[0065] The borehole location and rock sample determination module is used to determine the borehole location and rock sample of the pumping experiment based on the fracture height of the aquifer in the pumping experiment and the horizontal distance of the fracture from the opening.

[0066] The vertical infiltration velocity determination module is used to perform a confining pressure operation on the rock sample using a triaxial servo instrument under a preset infiltration water pressure, and obtain the vertical infiltration velocity of the rock sample after the confining pressure is released after the peak.

[0067] The constant flow calculation module is used to obtain the constant flow rate of the pumping experiment based on the vertical permeability of the rock sample after the peak unloading confining pressure.

[0068] The aquifer drawdown determination module is used to obtain the stable aquifer drawdown by conducting a non-complete well pumping experiment in the target area based on the borehole location of the pumping experiment, the constant flow rate of the pumping experiment, and the water level difference between the aquifer in the target area and the adjacent aquifers.

[0069] The aquifer permeability coefficient calculation module is used to obtain the aquifer permeability coefficient based on the stabilized aquifer drawdown.

[0070] The water inflow prediction module is used to obtain the water inflow of the coal mining face in the coal mining area using the large well method based on the permeability coefficient of the aquifer.

[0071] As an optional implementation, the vertical infiltration rate determination module specifically includes:

[0072] The acquisition unit is used to acquire the average unit weight of the overlying soil and rock mass of the rock sample and the thickness of the overlying soil and rock mass of the rock sample.

[0073] The confining pressure calculation unit is used to calculate the confining pressure value based on the average unit weight of the overlying soil and rock mass of the rock sample and the thickness of the overlying soil and rock mass of the rock sample.

[0074] The vertical permeability calculation unit is used to apply confining pressure to the rock sample under a preset permeable water pressure using a triaxial servo instrument, based on the confining pressure value, to obtain the vertical permeability of the rock sample after the confining pressure is released following the peak.

[0075] As an optional implementation, the constant flow calculation module specifically includes:

[0076] The constant flow calculation unit is used to calculate the flow rate according to the formula. Calculate the constant flow rate of the pumping experiment, where Q represents the constant flow rate of the pumping experiment, x represents the diameter of the filter tube in the pumping experiment, and v represents the vertical infiltration velocity of the rock sample after the peak is relieved of confining pressure.

[0077] This invention provides an electronic device, comprising:

[0078] A memory and a processor, the memory for storing a computer program, the processor for running the computer program to cause the electronic device to perform the coal face water inflow prediction method as described above.

[0079] This invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for predicting water inflow at a coal mining face.

[0080] This invention also provides a specific embodiment of the above-described method. In a certain mining area in China, during the previous mining of No. 2-2 coal, the mine was threatened by a weathered bedrock aquifer. Therefore, water inflow prediction was carried out at the coal face. However, the error in each prediction was as high as 23% to 42%, resulting in unnecessary waste of temporary underground water storage facilities and repeated overloading of the underground drainage system. To accurately predict the mine water inflow at the coal face, such as... Figure 2 As shown, the water inflow prediction method for coal mining faces provided by this invention is used for prediction:

[0081] Step 1: Determine the water level difference between the pumping aquifer and the adjacent aquifer.

[0082] The water level difference h between the aquifer and the adjacent aquifer in the pumping test is determined by using existing borehole columnar sections of the coal mining area (which can completely expose the aquifer and adjacent aquifers in the pumping test). In this embodiment, h = 2.1 meters.

[0083] Step 2: Numerical simulation to determine the scope of impact of mining.

[0084] Numerical models of the coal seam and the aquifer tested during pumping were established based on existing borehole columnar sections, forming a mining simulation model of the coal mining area (used for mining simulation). Based on the mining simulation model, numerical simulations of coal seam mining were performed to determine the fracture height *w* of the aquifer tested during pumping and the horizontal position where the fractures first developed in the aquifer, i.e., the horizontal distance *d* from the fracture to the cut. In this embodiment, *w* = 15.3 meters and *d* = 284 meters.

[0085] Step 3: Conduct a pumping test by drilling.

[0086] The pumping test borehole is selected within a horizontal distance d+0 to 10 meters from the opening borehole; in this embodiment, it is located at 290 meters, within the vertical projection range of the working face of the coal seam mining. The pumping test borehole exposes the pumping test aquifer and its adjacent aquifers, but uses different borehole diameters and is separated by casing. The pumping test borehole maintains a height w from the bottom plate upwards within the pumping test aquifer, using a filter pipe of diameter x tightly attached to the borehole wall. The remaining sections are sealed with cement slurry to prevent penetration before passing through the borehole; in this embodiment, x = 0.16 meters.

[0087] Step 4: Take rock samples from the aquifer for the pumping test.

[0088] Rock samples were obtained from the bottom of the aquifer in the vertical direction within a range w during the drilling of the pumping test borehole.

[0089] Step 5: Determine the vertical permeability rate of the rock sample after the peak is unloaded.

[0090] The rock samples obtained in step four were subjected to a rock triaxial servo instrument. Under the set permeation water pressure, confining pressure was applied to the rock samples. The confining pressure value P was calculated using the existing borehole columnar section and the unit weight of the rock and soil layers according to P = γ × m, where P is the confining pressure value, γ is the average unit weight of the overlying rock and soil of the rock sample, and m is the thickness of the overlying rock and soil of the rock sample. In this embodiment, P = 0.6 MPa. After the axial pressure was applied and the rock samples were damaged, the confining pressure was reduced by 5% to 40% (to 0.54 MPa in this embodiment). Finally, the triaxial servo instrument measured the vertical permeation velocity v of the rock samples after the peak was removed. In this embodiment, v = 388 m / d. The set permeation water pressure was calculated using the aquifer head height determined in step one.

[0091] Step 6: Calculate the constant flow rate for the pumping experiment.

[0092] The constant flow rate Q is calculated using the formula Q = (x / 2)² × π × v. In this embodiment, Q = 7.8 m³ / s. 3 / d, where x is the diameter of the filter tube in step three, π is pi, and v is the permeation rate of the rock sample after peak unloading measured in step five.

[0093] Step 7: Conduct a pumping test of the aquifer.

[0094] The pumping test was conducted at a constant flow rate of Q = 7.8 m. 3 Pumping is carried out at / d. During pumping, a section of the sealed aquifer is pumped using a non-complete well (the section of the non-complete well is determined according to w) to obtain the stabilized aquifer drawdown S. While pumping the experimental aquifer, pumping is also carried out on adjacent aquifers, and the difference between the water level difference between the two aquifers and h (2.1 meters in this embodiment) is kept within 10% of h (0.21 meters in this embodiment).

[0095] Step 8: Predict the coal mining water inflow using the results of the pumping test.

[0096] According to the formula Calculate the aquifer permeability coefficient K, where Q is the constant flow rate of the pumping experiment, S is the drawdown of the aquifer after stabilization, M is the aquifer thickness in the pumping experiment, and R is the radius of influence. r = x / 2, where r is the radius of the pumping test hole, L is the height of the filter pipe, and the permeability coefficient is used to predict the water inflow of the aquifer in coal seam mining using the established industry method (large well method). The S value is within 10% of the h value, taking into account the influence of overflow on the pumping test. M, L and r can all be directly measured.

[0097] The final predicted inflow was 183 m³. 3 / h, traditional pumping test methods predict a flow rate of 166m³ / h. 3 / h, actual inflow 198m³ 3 / h, it can be seen that the water inflow predicted by the coal mining face water inflow prediction method provided in the embodiments of the present invention is closer to the actual water inflow.

[0098] The main principles that distinguish the coal mining face water inflow prediction method provided in this embodiment of the invention from existing methods include three parts:

[0099] Part 1: Traditional pumping experiments have a long cycle, requiring three drawdowns, which inevitably causes overflow interference from other aquifers. However, the water inflow generated during coal mining is mainly completed instantaneously after the water-conducting fracture zone is connected, and the overflow flow is very small. This invention specifically adopts a single drawdown, that is, a constant flow rate Q, and simultaneously performs synchronous drawdown on adjacent aquifers to maintain the water level difference between them, reducing overflow. The permeability coefficient obtained at this time is more accurate for predicting the coal mining water inflow.

[0100] Part 2: In traditional pumping experiments, the constant flow rate Q is random, and the pumping test point is also random. Due to the heterogeneity of the aquifer, the permeability coefficient obtained from pumping experiments can vary significantly. The pumping test location selected in this invention is determined based on the failure characteristics of the overburden in coal mining. Furthermore, the constant flow rate is determined based on the seepage velocity under unloading conditions after the coal mining rock failure, which aligns with the changes in the stress field and fracture field of the coal mining overburden.

[0101] Part 3: Traditional pumping experiments use complete wells. In reality, the fracture zones caused by coal mining do not necessarily completely penetrate the aquifer. This invention uses incomplete wells, which are closer to reality. The layers in incomplete wells are directly related to the destruction patterns of coal mining overburden.

[0102] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0103] 1) Simple and easy to implement; 2) Relatively low cost; 3) More accurate for predicting water inflow in coal mining areas.

[0104] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple; relevant parts can be referred to the method section.

[0105] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for predicting water inflow in a coal mining face, characterized in that, include: The water level difference between the target aquifer and adjacent aquifers in the target area and the mining simulation model of the coal mining area are determined based on the borehole columnar section of the coal mining area; the target area is the area in the coal mining area where the pumping experiment is to be conducted. Based on the mining simulation model, the fracture height of the aquifer and the horizontal distance from the fracture to the opening were obtained in the coal seam mining simulation of the pumping experiment. The drilling location and rock sample for the pumping experiment were obtained based on the fracture height of the aquifer in the pumping experiment and the horizontal distance between the fracture and the opening. Under a preset permeation water pressure, a triaxial servo instrument is used to apply confining pressure to the rock sample, and the vertical permeation velocity of the rock sample after the confining pressure is released following the peak is obtained; specifically including: The average unit weight of the overlying soil and rock mass and the thickness of the overlying soil and rock mass were obtained from the rock sample. The confining pressure value is calculated based on the average unit weight of the overlying soil and rock mass of the rock sample and the thickness of the overlying soil and rock mass of the rock sample. Based on the confining pressure value, a triaxial servo instrument is used to apply confining pressure to the rock sample under a preset permeation water pressure to obtain the vertical permeation velocity of the rock sample after the confining pressure is released after the peak. The constant flow rate of the pumping experiment is obtained based on the vertical seepage velocity of the rock sample after the peak pressure is released, specifically including: According to the formula Calculate the constant flow rate for the pumping experiment, where, This indicates the constant flow rate in the pumping experiment. This indicates the diameter of the filter tube used in the pumping experiment. This indicates the vertical permeability of the rock sample after the peak is relieved of confining pressure; Based on the borehole location of the pumping experiment, the constant flow rate of the pumping experiment, and the water level difference between the aquifer in the target area and the adjacent aquifer, a non-complete well pumping experiment is conducted in the target area to obtain the stabilized aquifer drawdown; specifically, while pumping water from the aquifer, water is also pumped from the adjacent aquifer, and the difference between the water level difference between the two aquifers and h is controlled within 10% of h; h is the water level difference between the aquifer in the target area and the adjacent aquifer. The aquifer permeability coefficient is obtained based on the stabilized aquifer drawdown; specifically, according to the formula... Calculate the aquifer permeability coefficient K, where, For the constant flow rate of the pumping experiment, To draw down the aquifer after it has stabilized, The thickness of the aquifer in the pumping test. To influence radius , The radius of the pumping test hole, The height of the filter tube; The water inflow at the coal face of the mining area is obtained using the large well method based on the aquifer permeability coefficient.

2. A coal mining face water inflow prediction system, characterized in that, include: The determination module is used to determine the water level difference between the aquifer and adjacent aquifers in the target area and the mining simulation model of the coal mining area based on the borehole columnar section of the coal mining area; the target area is the area in the coal mining area where the pumping experiment is to be conducted. The parameter calculation module is used to simulate coal seam mining based on the mining simulation model to obtain the fracture height and horizontal distance of the fracture from the aquifer in the pumping experiment. The borehole location and rock sample determination module is used to determine the borehole location and rock sample of the pumping experiment based on the fracture height of the aquifer in the pumping experiment and the horizontal distance of the fracture from the opening. A vertical permeability determination module is used to apply confining pressure to the rock sample using a triaxial servo instrument under a preset permeation water pressure, and obtain the vertical permeability of the rock sample after the confining pressure is released following the peak; specifically, it includes: The acquisition unit is used to acquire the average unit weight of the overlying rock and soil of the rock sample and the thickness of the overlying rock and soil of the rock sample; The confining pressure calculation unit is used to calculate the confining pressure value based on the average unit weight of the overlying rock and soil of the rock sample and the thickness of the overlying rock and soil of the rock sample. The vertical infiltration velocity calculation unit is used to apply confining pressure to the rock sample under a preset infiltration water pressure using a triaxial servo instrument based on the confining pressure value, and to obtain the vertical infiltration velocity of the rock sample after the confining pressure is released after the peak. The constant flow rate calculation module is used to obtain the constant flow rate for the pumping experiment based on the vertical seepage velocity of the rock sample after the peak unloading confining pressure; the constant flow rate calculation module specifically includes: a constant flow rate calculation unit, used to calculate the constant flow rate according to the formula Calculate the constant flow rate for the pumping experiment, where, This indicates the constant flow rate in the pumping experiment. This indicates the diameter of the filter tube used in the pumping experiment. This indicates the vertical permeability of the rock sample after the peak is relieved of confining pressure; The aquifer drawdown determination module is used to obtain a stable aquifer drawdown by conducting a non-complete well pumping experiment in the target area based on the borehole location of the pumping experiment, the constant flow rate of the pumping experiment, and the water level difference between the aquifer in the target area and adjacent aquifers. Specifically, while pumping water from the aquifer, water is also pumped from adjacent aquifers, and the difference between the water level difference between the two aquifers and h is controlled within 10% of h; where h is the water level difference between the aquifer in the target area and adjacent aquifers. The aquifer permeability coefficient calculation module is used to obtain the aquifer permeability coefficient based on the stabilized aquifer drawdown; specifically, according to the formula... Calculate the aquifer permeability coefficient K, where, For the constant flow rate of the pumping experiment, To draw down the aquifer after it has stabilized, The thickness of the aquifer in the pumping test. To influence radius , The radius of the pumping test hole, The height of the filter tube; The water inflow prediction module is used to obtain the water inflow of the coal mining face in the coal mining area using the large well method based on the permeability coefficient of the aquifer.

3. An electronic device, characterized in that, include: A memory and a processor, the memory for storing a computer program, the processor for running the computer program to cause the electronic device to perform the method for predicting water inflow in a coal mining face according to claim 1.

4. A computer-readable storage medium, characterized in that, It stores a computer program that, when executed by a processor, implements the method for predicting water inflow at a coal mining face as described in claim 1.

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