微震监测技术在煤矿底板突水预警中的应用

Application of microseismic monitoring technology in water inrush warning of coal mine floor

为采用微震监测技术预警煤矿底板突水,以董家河煤矿22517工作面开采过程为背景,采用微震监测技术构建了适应现场水文地质条件的微震监测系统,对董家河煤矿22517工作面底板进行了监测。监测结果表明:董家河煤矿22517工作面底板的总体趋势趋于稳定,底板微震事件主要分布于3个区域,分别为构造影响微震区、采动影响微震区和滞后微震区;底板微震事件绝大部分集中在12 m以内的范围,但存在2个异常区,且异常区Ⅰ已形成底板导水通道,底板出水点可能位于工作面前50 m至后30 m的区域。通过对微震监测结果结合地质钻孔柱状综合分析确定底板破坏深度为11.22 m,理论计算与钻孔声波测试结果与微震监测结果分别相差0.32 m与0.42 m。

In order to use the microseismic monitoring technology to warn the coal mine floor water inrush,based on the mining process of No.22517 working face in Dongjiahe Coal Mine,a microseismic monitoring system adapted to on-site hydrogeological conditions was constructed using microseismic monitoring technology,and the floor of No.22517 working face was monitored.The monitoring results show that the overall trend of No.22517 working face floor tends to be stable,and the microseismic events of the floor are mainly distributed in three areas,namely,the structure affecting microseismic area,the mining affecting microseismic area and the lag microseismic area; most of the microseismic events are concentrated within the range of 12 m,but there are two abnormal areas,and the area Ⅰ has formed floor water channel,and the floor water outlet may be located in the area from 50 m in front of the working face to 30 m in the rear. Through the microseismic monitoring results combined with geological borehole columnar comprehensive analysis to determine the floor damage depth is11.22 m,the theoretical calculation and the results of the borehole acoustic wave test are 0.32 m and 0.42 m respectively compared with the microseismic monitoring results.