掘进工作面前方应力与瓦斯压力测定试验

Measurement Test on Rock Stress and Gas Pressure Ahead of Driving Face

为了掌握采掘活动对掘进工作面前方应力与瓦斯压力的影响范围及其影响程度,提出了从抽采巷向下施工钻孔安设应力传感器和压力传感器的措施,对谢一矿5122(5)机巷掘进工作面前方超前应力和瓦斯压力变化规律进行试验研究。结果表明:掘进工作面采掘活动对其前方应力与瓦斯压力的影响范围约在35~40 m左右;应力变化的峰值发生在掘进迎头的前方2~6 m处,在工作面推过40 m以后逐渐恢复到煤岩原始应力状态;瓦斯压力变化的峰值发生在工作面推过后方1.5~8 m处,在工作面推过后约15~25 m开始逐步回升并稳定在某一范围。从监测数据的分析结果来看,在应力和瓦斯压力监测上取得了良好的效果。

In order to get the influence scope and degree of mining activity on ground stress and gas pressure, we propose the measures of installing stress and pressure sensors in drainage roadway to study the change laws of advancing rock stress and gas pressure at 5122（5） driving face in Xieyi Coal Mine. The results show that the affected range of mining activity on rock stress and gas pressure ahead of driving face is about 35 m to 40 m; peak value of rock stress change occurs in the front of the tunneling of 2 m to 6 m and it is close to its original stress level after advancing about 40 m. The maximum change of gas pressure occurrs at about 1.5 m to 8 m after advancing the rear of working face, and is gradually recovered and stable in a certain range after the working face advances about 15 m to 25 m. From the perspective of the analysis of monitoring data, the monitoring on stress and gas pressure achieves good effect.