CN-119878161-B - Full-space-time combined prevention and control method for risk of repeated mining water burst of deep close coal seam group

CN119878161BCN 119878161 BCN119878161 BCN 119878161BCN-119878161-B

Abstract

The invention provides a full space-time combined prevention and control method for the risk of repeated mining and water burst of deep close coal seam groups. The method comprises the steps of optimizing a working face roadway arrangement scheme through physical simulation and numerical simulation before stoping, forming a cutting hole and inclined double-internal staggered arrangement mode, arranging a bottom plate roadway, increasing the thickness of a water-resisting layer through regional treatment before stoping to reduce water burst coefficients, monitoring time, space and intensity information of microseismic events in a region during stoping, determining microseismic monitoring and early warning grades, observing ore pressure values and hydrological information during stoping, focusing on changes of the ore pressure values and hydrological information, and simultaneously combining the microseismic monitoring and early warning grades and a deep event dense region, and carrying out push-mining speed control and fixed-point dynamic hydrophobic depressurization to reduce the working face water burst coefficients. The invention is controlled by the combination of the three methods of mine pressure, water pressure and microseism monitoring and early warning, and can reduce the risk of water burst and ensure the safe stoping of the working face through the full time period before stoping and during stoping.

Inventors

ZHAO LISONG
LIU YAN
LU GANG
WU BIN
LIU RUI
GUO XUETING
ZHAO GUANGMIAO
YANG BO
ZHOU JINYAN
GAO GANG
YANG HONGZENG
LI YUBAO
LIU BAOMIN
ZHAO DONG
YANG CE

Assignees

河北煤炭科学研究院有限公司

Dates

Publication Date: 20260505
Application Date: 20241230

Claims (9)

1. The full-space-time combined prevention and control method for the risk of repeated mining water burst of deep close-range coal seam groups is characterized by comprising the following steps of: Optimizing a working face roadway arrangement scheme by physical simulation and numerical simulation before stoping of a layered working face under a close-range coal seam group, forming a cutting hole and an inclined double-internal staggered arrangement mode of an upper roadway and a lower roadway relative to an upper layered working face, and arranging a bottom plate roadway; The thickness of the water-resisting layer is increased by regional treatment before stoping of the lower layered working surface so as to reduce the water burst coefficient; time, space and intensity information of microseismic events in a monitoring area in stoping, and determining microseismic monitoring early warning grades; observing the ore pressure value and hydrologic information in stoping, focusing on the changes of the ore pressure value and the hydrologic information, and simultaneously carrying out pushing speed control and fixed-point dynamic hydrophobic depressurization by combining the microseismic monitoring early warning level and a deep event dense region so as to reduce the water burst coefficient of a working face; the determining the microseismic monitoring and early warning level comprises the following steps: If the daily amplitude of the base plate event is higher than a first preset threshold value and lower than a second preset threshold value, or a microseismic event occurs in the main relatively water-rich thin limestone, the early warning level is four; If the daily amplitude of the bottom plate event is higher than a second preset threshold value within 7 days, or the main water-rich thin layer limestone event or the Ore ash event occurs within 2 days within 7 days, the early warning level is three-level; If the daily amplitude of the bottom plate event is higher than a third preset threshold value within 7 days, or a main water-rich thin layer limestone event is mainly generated within 5 days within 7 days, or an Ore ash event is generated within 3 days within 7 days, or the bottom plate microseismic event near a mining line is gathered in a vertically penetrating way, the early warning level is two-level, wherein the third preset threshold value is higher than the second preset threshold value, and the second preset threshold value is higher than the first preset threshold value; If the second-level early warning is continuously carried out for 3 days and the Ordovician event is continuously carried out for 3 days, the early warning grade is first-level; the method combines the microseismic monitoring early warning level and the deep event dense area to control the push-mining speed and realize fixed-point dynamic hydrophobic depressurization, and further comprises the following steps: Judging the pressure intensity based on the frequency change rate of the microseismic event and the energy index, and taking a prevention and control measure corresponding to the pressure intensity, wherein the prevention and control measure comprises supporting measure adjustment, speed control and water pressure control.
2. The deep close-range coal seam group repeated mining water burst risk full-space-time joint prevention and control method according to claim 1, wherein the working face roadway arrangement scheme is optimized by physical simulation before stoping, and the method comprises the following steps: Making a physical simulation model according to a similar scale by referring to the scale of the working surface, and selecting components constituting the physical simulation model according to actual geological data of a mine; based on the physical simulation model, the top plate is pressurized linearly by combining the stoping advancing time length and the combined mechanical property of the coal and rock mass of the top plate, the bottom plate is pressurized by a spring to simulate the pressure of the bearing water of the bottom plate, and a group of comparison schemes are compared, wherein the comparison schemes are used for comparing the alignment of the cutting holes and the internal errors of the cutting holes, and the alignment conditions of the cutting holes are consistent.
3. The deep close-range coal seam group repeated mining water burst risk full-space-time combined prevention and control method according to claim 1, wherein the working face roadway arrangement scheme is optimized by numerical simulation before stoping, and the method comprises the following steps: Establishing a cover rock movement rule model in the coal seam stoping process based on fluid-solid coupling simulation based on monitoring the drilling histogram of the working face, surrounding rock and coal seam physical and mechanical parameters; And selecting three influencing factors of cut hole arrangement, inclination arrangement and stoping speed by adopting an orthogonal test design method, aligning cut holes, cutting holes with wrong inclination, highlighting inclination and correcting inclination, taking slow stoping, medium-speed stoping and quick stoping as simulation factors and levels, and carrying out combination comparison on the simulation factors and levels based on the overburden rock movement rule model.
4. The deep close-range coal seam group repeated mining water burst risk full-space-time combined prevention and control method according to claim 1, wherein the increasing of the thickness of the water-resisting layer by regional treatment before stoping to reduce the water burst coefficient comprises the following steps: the thickness of a water-resisting layer is increased through regional treatment before stoping, the water bursting coefficient of a normal section is controlled to be 0.06MPa/m, and the water bursting coefficient of a weak region is controlled to be 0.04MPa/m through water drainage.
5. The deep close-range coal seam group repeated mining water burst risk all-space-time joint prevention and control method according to claim 1, wherein the fixed-point dynamic hydrophobic depressurization comprises: when the working surface is pressed or the water quantity change is larger than a preset water quantity change threshold value, the drainage time of the hydrophobic drilling hole is controlled through a valve; according to the stoping condition, carrying out dynamic drainage in a geological structure passing region, a microseismic deep incident dense region and a primary fracture zone, wherein the water burst coefficient of a normal region is 0.06MPa/m, and the water burst coefficient of a geological weak region is 0.04MPa/m; Based on the change of the water level after the drainage and depressurization and the change of the water inflow of the mine, the drainage and depressurization effect is evaluated.
6. The deep close-range coal seam group repeated mining water burst risk all-space-time joint prevention and control method according to claim 1, wherein the performing the push mining speed control comprises: the pushing speed of the deep event dense area is controlled to be 1.2-2 times of the normal pushing speed.
7. The utility model provides a deep close coal seam group repeated mining water burst risk all-space-time joint prevention and control device which characterized in that includes: The optimization module is used for optimizing a working face roadway arrangement scheme by physical simulation and numerical simulation before stoping of the lower layered working face, forming a inclined double-internal-staggered arrangement mode of a cut and an upper roadway and a lower roadway, and carrying out floor roadway arrangement; the treatment module is used for increasing the thickness of the water-resisting layer through regional treatment before stoping so as to reduce the water burst coefficient; the monitoring module is used for detecting time, space and intensity information of the microseismic events in the area in stoping and determining the microseismic monitoring early warning level; the thinning and lowering module is used for observing the ore pressure value and hydrologic information in stoping, focusing on the changes of the ore pressure value and the hydrologic information, and simultaneously combining the microseismic monitoring early warning level and a deep event dense area to control the stoping speed and realize fixed-point dynamic hydrophobic depressurization so as to reduce the water burst coefficient of a working face; the monitoring module is specifically used for: If the daily amplitude of the base plate event is higher than a first preset threshold value and lower than a second preset threshold value, or a microseismic event occurs in the main relatively water-rich thin limestone, the early warning level is four; If the daily amplitude of the bottom plate event is higher than a second preset threshold value within 7 days, or the main water-rich thin layer limestone event or the Ore ash event occurs within 2 days within 7 days, the early warning level is three-level; If the daily amplitude of the bottom plate event is higher than a third preset threshold value within 7 days, or a main water-rich thin layer limestone event is mainly generated within 5 days within 7 days, or an Ore ash event is generated within 3 days within 7 days, or the bottom plate microseismic event near a mining line is gathered in a vertically penetrating way, the early warning level is two-level, wherein the third preset threshold value is higher than the second preset threshold value, and the second preset threshold value is higher than the first preset threshold value; If the second-level early warning is continuously carried out for 3 days and the Ordovician event is continuously carried out for 3 days, the early warning grade is first-level; the thinning module is further used for: Judging the pressure intensity based on the frequency change rate of the microseismic event and the energy index, and taking a prevention and control measure corresponding to the pressure intensity, wherein the prevention and control measure comprises supporting measure adjustment, speed control and water pressure control.
8. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of the preceding claims 1 to 6 when the computer program is executed.
9. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method according to any of the preceding claims 1 to 6.

Description

Full-space-time combined prevention and control method for risk of repeated mining water burst of deep close coal seam group Technical Field The invention relates to the field of coal seam technology and coal mine water hazard prevention and control, in particular to a full space-time combined prevention and control method for repeated mining water burst risks of deep close coal seam groups. Background Coal is an important basic energy source in China, but the occurrence conditions of coal resources are different, and different forms of safety problems are faced in stoping. The extremely close coal seam is characterized in that the coal seam spacing is close, the influence is obvious when the adjacent coal seam is mined, the surrounding rock of a roadway is seriously deformed under the influence of repeated mining, the intensity of mine pressure appearance is increased, the threat degree of water damage of a bottom plate under the condition of repeated mining is greatly increased, the difficulty of preventing and controlling water is increased, abnormal fluctuation of water burst of a mine is extremely easy to cause in the mining process, and the production safety of the mine is seriously threatened. At present, in the aspect of close-range coal seam mining water hazard prevention and control, dynamic control cannot be realized mainly by strengthening hydrologic observation, object drilling and exploration of abnormal areas and the like, and the means is single, so that the effect of reducing the water burst risk is to be improved. Disclosure of Invention The embodiment of the invention provides a full-space-time combined prevention and control method for the risk of repeated mining and water bursting of a deep close coal seam group, which aims to solve the problem of reducing the risk of stoping and water bursting of an extremely close coal seam. In a first aspect, an embodiment of the present invention provides a deep close coal seam group repeated mining and water inrush risk all-space-time joint prevention and control method, including: Optimizing a working face roadway arrangement scheme through physical simulation and numerical simulation before stoping to form a cutting hole and inclined double-internal-staggered arrangement mode, and carrying out floor roadway arrangement; the thickness of the water-resisting layer is increased through regional treatment before stoping so as to reduce the water burst coefficient; time, space and intensity information of microseismic events in a monitoring area in stoping, and determining microseismic monitoring early warning grades; and observing the ore pressure value and hydrologic information in stoping, paying attention to the change of the ore pressure value and hydrologic information, and simultaneously carrying out push-mining speed control and fixed-point dynamic drainage depressurization by combining a microseismic monitoring early warning level and a deep event dense area so as to reduce the water burst coefficient of a working surface. In one possible implementation, optimizing a face roadway layout scheme by physical simulation prior to stoping includes: making a physical simulation model according to a similar scale by referring to the scale of the working surface, and selecting components constituting the physical simulation model according to actual geological data of the mine; Based on a physical simulation model, the top plate is pressurized linearly by combining the stoping advancing time length and the combined mechanical property of the coal and rock mass of the top plate, the bottom plate adopts spring pressurization to simulate the pressure of the bearing water of the bottom plate, and a group of comparison schemes are compared, wherein the comparison schemes are used for comparing the alignment of the cutting holes and the internal error of the cutting holes, and the alignment conditions of the cutting holes are consistent. In one possible implementation, optimizing the face roadway layout scheme by numerical simulation prior to stoping includes: Establishing a cover rock movement rule model in the coal seam stoping process based on fluid-solid coupling simulation based on monitoring the drilling histogram of the working face, surrounding rock and coal seam physical and mechanical parameters; By adopting an orthogonal test design method, three influencing factors of cut hole arrangement, inclination arrangement and stoping speed are selected, cut holes are aligned, cut holes are staggered in the way, inclination is aligned, inclination is prominent, inclination is staggered in the way, slow stoping, medium-speed stoping and quick stoping are used as simulation factors and levels, and combination comparison is carried out on the simulation factors and levels based on a overburden rock movement rule model. In one possible implementation, the reducing the face water pressure by zone remediation prior to recovery to increase the water barrier thic