近距离高应力强突煤层群工作面区域瓦斯联合高效治理技术研究与应用

近距离高应力强突煤层群主要受地应力主导的复合动力灾害影响,另加上层理紊乱、煤质极其松软的软分层,极大增加了深部强突煤层诱导煤与瓦斯突出的风险。现如水力冲孔、机械造穴等常规的增透技术,存在着影响范围小、衰减速度快、工作量繁重等缺陷,这导致瓦斯治理工程量大、瓦斯治理成本高且整体瓦斯治理效果较差,严重制约着矿井的生产接替。为解决深部强突煤层群瓦斯治理难题,该文以平衡或消除地应力为切入点,在平煤股份一矿回采区域引入高压注水增透技术。通过工程实践发现,高压注水增透后有效影响半径为26 m以上;平均单孔抽采纯量提高了12.6倍。该工程实践可为近距离高应力强突煤层群瓦斯高效治理技术提供参考。

The close-range high-stress and strong-outburst coal seam group is mainly affected by a compound dynamic disaster dominated by ground stress.In addition,the soft strata with disordered bedding and extremely soft coal quality greatly increase the risk of coal and gas outburst induced by deep strong-outburst coal seam.Conventional enhanced penetration technologies such as hydraulic punching and mechanical hole making have defects such as small influence range,fast attenuation speed,and heavy workload.This leads to a large amount of gas control projects,high gas control costs,and poor overall gas control effect,which seriously restricts the production replacement of mines.In order to solve the problem of gas control in deep strong outburst coal seam groups,this paper takes balancing or eliminating ground stress as the starting point and introduces high-pressure water injection and permeability enhancement technology in the mining area of Pingmei No.1 Mine.Through engineering practice,it is found that the effective impact radius after high-pressure water injection is more than 26m;the average pure volume of single hole extraction is increased by 12.6 times.This project practice can provide reference for efficient gas control technology in close range high-stress and strong outburst coal seam groups.