CN-115600399-B - Coal face water inflow prediction method, system, electronic equipment and medium

CN115600399BCN 115600399 BCN115600399 BCN 115600399BCN-115600399-B

Abstract

The invention relates to a coal face water inflow prediction method, a system, electronic equipment and a medium, in particular to the technical fields of mine hydrogeology and mining engineering. The method comprises the steps of determining a water level difference between an aquifer and an adjacent aquifer and a mining simulation model of the coal mining area according to a drilling histogram of the coal mining area, performing coal seam mining simulation according to the mining simulation model to obtain the fracture height of the aquifer and the horizontal distance between a crack and a cutting hole of a water pumping experiment, obtaining the drilling position and a rock sample of the water pumping experiment according to the fracture height and the horizontal distance, performing confining pressure operation on the rock sample by adopting a triaxial servo instrument to obtain the vertical permeation speed, obtaining the constant flow of the water pumping experiment according to the vertical permeation speed, performing the incomplete well water pumping experiment according to the drilling position, the constant flow and the water level difference to obtain the stable water level descending depth, and obtaining the water inflow according to the stable water level descending depth. The invention ensures that the prediction result of the water inflow of the coal mining area is more accurate and reduces the cost.

Inventors

JIANG ZEQUAN
FAN LIMIN
GUO LIANGLIANG
LI TAO
GAO YING

Assignees

陕西省一八五煤田地质有限公司
中国矿业大学
六盘水师范学院

Dates

Publication Date: 20260512
Application Date: 20221012

Claims (4)

1. The coal face water inflow prediction method is characterized by comprising the following steps of: Determining a water level difference between an aquifer and an adjacent aquifer of a target area and a mining simulation model of the coal mining area according to a drilling histogram of the coal mining area, wherein the target area is an area to be subjected to a water pumping experiment in the coal mining area; Performing coal seam mining simulation according to the mining simulation model to obtain the fracture height of the water-bearing layer of the water pumping experiment and the horizontal distance between the fracture distance and the cut hole; Obtaining drilling positions and rock samples of the pumping experiment according to the fracture height of the water-bearing stratum of the pumping experiment and the horizontal distance between the fracture and the cutting hole; the method comprises the steps of carrying out confining pressure increasing operation on the rock sample by adopting a triaxial servo instrument under preset osmotic water pressure to obtain the vertical permeation speed of the rock sample with the confining pressure discharged after the peak, and specifically comprises the following steps: Acquiring the average volume weight of the overlying rock soil body of the rock sample and the thickness of the overlying rock soil body of the rock sample; Calculating a confining pressure value according to the average volume weight of the overlying rock soil body of the rock sample and the thickness of the overlying rock soil body of the rock sample; Performing confining pressure adding operation on the rock sample by adopting a triaxial servo instrument under the preset osmotic water pressure according to the confining pressure value to obtain the vertical permeation speed of the rock sample with the confining pressure discharged after the peak; obtaining constant flow of a pumping experiment according to the vertical permeation speed of the rock sample with the peak post-relief confining pressure, wherein the constant flow comprises the following specific steps: According to the formula Calculating the constant flow rate of the pumping experiment, wherein, The constant flow rate of the pumping experiment is shown, Represents the diameter of the filter tube in the water pumping experiment, The vertical penetration rate of the rock sample representing the post-peak relief pressure; carrying out incomplete well pumping experiments on the target area according to the drilling position of the pumping experiment, the constant flow of the pumping experiment and the water level difference between the water-bearing layer of the target area and the adjacent water-bearing layer to obtain the stable water-bearing layer descending depth; Obtaining the permeability coefficient of the aquifer according to the stabilized aquifer depth, specifically according to the formula The permeability coefficient K of the aquifer is calculated, wherein, For the constant flow rate of the water pumping experiment, In order to reduce the depth of the stabilized aquifer, For the water pumping experiment, the thickness of the aquifer, To influence radius , In order to draw water and test the radius of the hole, The height of the filter tube; And obtaining the water inflow of the coal face of the coal mining area by adopting a large well method according to the permeability coefficient of the aquifer.
2. A coal face water inflow prediction system, comprising: The system comprises a determining module, a mining simulation model and a water pumping module, wherein the determining module is used for determining the water level difference between an aquifer and an adjacent aquifer of a target area and the mining simulation model of the coal mining area according to a drilling histogram of the coal mining area; The parameter calculation module is used for carrying out coal seam mining simulation according to the mining simulation model to obtain the fracture height of the water-pumping experiment aquifer and the horizontal distance between the fracture distance and the cut hole; The drilling position and rock sample determining module is used for obtaining the drilling position and the rock sample of the pumping experiment according to the fracture height of the aquifer of the pumping experiment and the horizontal distance between the fracture and the cutting hole; the vertical permeation speed determining module is used for carrying out confining pressure adding operation on the rock sample by adopting a triaxial servo instrument under the preset permeation water pressure to obtain the vertical permeation speed of the rock sample with the confining pressure discharged after the peak, and specifically comprises the following steps: The acquisition unit is used for acquiring the average volume weight of the overlying rock soil body of the rock sample and the thickness of the overlying rock soil body of the rock sample; the confining pressure value calculating unit is used for calculating a confining pressure value according to the average volume weight of the overlying rock soil body of the rock sample and the thickness of the overlying rock soil body of the rock sample; The vertical permeation speed calculation unit is used for carrying out confining pressure adding operation on the rock sample by adopting a triaxial servo instrument under the preset permeation water pressure according to the confining pressure value to obtain the vertical permeation speed of the rock sample with the confining pressure discharged after the peak; The constant flow rate calculation module is used for obtaining the constant flow rate of the pumping experiment according to the vertical permeation speed of the rock sample with the peak-to-peak relief confining pressure, and specifically comprises a constant flow rate calculation unit used for obtaining the constant flow rate of the pumping experiment according to a formula Calculating the constant flow rate of the pumping experiment, wherein, The constant flow rate of the pumping experiment is shown, Represents the diameter of the filter tube in the water pumping experiment, The vertical penetration rate of the rock sample representing the post-peak relief pressure; The aquifer lowering depth determining module is used for carrying out incomplete well pumping experiments on the target area according to the drilling position of the pumping experiment, the constant flow of the pumping experiment and the water level difference between the aquifer of the target area and the adjacent aquifer to obtain the stable aquifer lowering depth; the aquifer permeability coefficient calculation module is used for obtaining the aquifer permeability coefficient according to the stabilized aquifer depth, specifically according to the formula The permeability coefficient K of the aquifer is calculated, wherein, For the constant flow rate of the water pumping experiment, In order to reduce the depth of the stabilized aquifer, For the water pumping experiment, the thickness of the aquifer, To influence radius , In order to draw water and test the radius of the hole, The height of the filter tube; And the water inflow prediction module is used for obtaining the water inflow of the coal face of the coal mining area by adopting a large well method according to the permeability coefficient of the aquifer.
3. An electronic device, comprising: a memory for storing a computer program, and a processor that runs the computer program to cause the electronic device to perform the coal face water inflow prediction method of claim 1.
4. A computer-readable storage medium, characterized in that it stores a computer program which, when executed by a processor, implements the coal face water inflow prediction method according to claim 1.

Description

Coal face water inflow prediction method, system, electronic equipment and medium Technical Field The invention relates to the technical field of mine hydrogeology and mining engineering, in particular to a coal face water inflow prediction method, a system, electronic equipment and a medium. Background The water pumping experiment is a main experiment for determining the permeability coefficient of an important parameter of an aquifer, is used for predicting the water inflow of a coal face in a coal mining area, and is very important for exploitation of coal resources threatened by water damage. The existing water pumping experiments of the aquifer in the coal mining area and the water pumping experiments of the non-coal mining area have no big gap, which causes the following problems: (1) The existing aquifer water pumping experiment is not representative, and the aquifer is heterogeneous in the vertical direction, so that the choice of the landing depth of the existing water pumping experiment is relatively random, the water filling rule distribution of coal mining is not combined, and the obtained permeability coefficient has large prediction error on the water inflow of the coal mining area. (2) The coal exploitation enables the water-bearing layer to be filled with water in a short time, but the traditional water pumping experiment has longer time span, a large amount of overflow supply is easy to generate, and the obtained permeability coefficient is not applicable to the prediction of water inflow. (3) The traditional water pumping experiment needs three different landing depths, and has long time and higher cost. Disclosure of Invention The invention aims to provide a coal face water inflow prediction method, a system, electronic equipment and a medium, which can enable a prediction result of water inflow of a coal mining area to be more accurate and reduce cost. In order to achieve the above object, the present invention provides the following solutions: a coal face water inflow prediction method comprises the following steps: Determining a water level difference between an aquifer and an adjacent aquifer of a target area and a mining simulation model of the coal mining area according to a drilling histogram of the coal mining area, wherein the target area is an area to be subjected to a water pumping experiment in the coal mining area; Performing coal seam mining simulation according to the mining simulation model to obtain the fracture height of the water-bearing layer of the water pumping experiment and the horizontal distance between the fracture distance and the cut hole; Obtaining drilling positions and rock samples of the pumping experiment according to the fracture height of the water-bearing stratum of the pumping experiment and the horizontal distance between the fracture and the cutting hole; Performing confining pressure increasing operation on the rock sample by adopting a triaxial servo under preset osmotic water pressure to obtain the vertical permeation speed of the rock sample with the confining pressure discharged after the peak; Obtaining constant flow of a pumping experiment according to the vertical permeation speed of the rock sample with the peak back pressure relief; Carrying out a non-complete well pumping experiment on the target area according to the drilling position of the pumping experiment, the constant flow of the pumping experiment and the water level difference between the water-bearing layer and the adjacent water-bearing layer of the target area to obtain the stabilized water-bearing layer descending depth; obtaining the permeability coefficient of the aquifer according to the stabilized aquifer; And obtaining the water inflow of the coal face of the coal mining area by adopting a large well method according to the permeability coefficient of the aquifer. Optionally, the performing the confining pressure adding operation on the rock sample by using a triaxial servo under the preset osmotic water pressure to obtain the vertical permeation speed of the rock sample with the confining pressure removed after the peak specifically includes: Acquiring the average volume weight of the overlying rock soil body of the rock sample and the thickness of the overlying rock soil body of the rock sample; Calculating a confining pressure value according to the average volume weight of the overlying rock soil body of the rock sample and the thickness of the overlying rock soil body of the rock sample; And carrying out confining pressure adding operation on the rock sample by adopting a triaxial servo instrument under the preset osmotic water pressure according to the confining pressure value, so as to obtain the vertical permeation speed of the rock sample with the confining pressure discharged after the peak. Optionally, the constant flow rate of the pumping experiment is obtained according to the vertical permeation speed of the rock sample with the peak-to-peak relief confinin