榆横北区富水煤层巷道掘进防治水技术

Discussion on water prevention and control technology of roadway tunneling in water-rich coal seam in northern Yuheng Mining Area

为解决榆横北区富水煤层巷道掘进过程中的2号煤层水患问题,以巴拉素煤矿为例,结合以往采掘经验,首先进行岩巷内超前钻探工程(短钻+长钻)、水化学分析,而后提出针对于本区特殊的煤层水害巷道掘进的疏放水探查思路。结果表明:前期对2号煤层的钻探工程疏放水效果显著,各钻孔水量、水压衰减明显,说明2号煤层水体补给条件差,总体属于静态水赋存状态。经水质全分析测试发现:2号煤层水的水质类型基本为SO4-Na·(Ca)型水,p H值在7.63~8.04之间,总矿化度在5 820.88~6 202.99 mg/L之间,认为其水体径流、排泄条件有限,长期处于封闭状态,有利于疏放水工作的开展。由此,提出适用于本区2号煤层掘进巷道的疏放水探查思路,具体包括"双层漏斗式"、"超前掩护式"、"下煤引流式"及"双侧羽状式"等钻探技术方案。

In order to solve the problem of No. 2 coal seam water hazards during the roadway tunneling process of the water-rich coal seam in northern Yuheng Mining Area, taking Balasu Coal Mine as an example, and combining the previous mining experience, firstly, the advanced drilling engineering(short drill + long drill) and the hydrochemical analysis in the rock roadway are carried out, and then the drainage water exploration ideas for the tunneling of the special coal seam water hazards in this area is proposed. The results show that the water drainage effect of the drilling project of No.2 coal seam in the early stage is remarkable, and the water volume and water pressure attenuation of each drill hole are obvious, indicating that the water recharge condition of No.2 coal seam is poor, and the whole coal seam belongs to the state of static water occurrence. Through the full analysis test of coal seam water, it is found that the water quality type of No.2 coal seam is basically SO4-Na·(Ca) type water,with the pH value between 7.63-8.04 and a total salinity of 5 820.88 mg/L to 6 202.99 mg/L. It is believed that the water runoff and discharge conditions are limited and the water is in a closed state for a long time, which is conducive to the development of water drainage. Therefore, the ideas of drainage water exploration suitable for the roadway tunneling of No.2 coal seam in this area is proposed, including drilling technical schemes such as "double funnel mode", "advance screen mode", "lower coal drainage mode"and"bilateral feather mode".