宽沟煤矿坚硬厚层顶板下冲击地压危险时期的微震特征及解危措施

针对某矿坚硬厚层顶板条件下采煤工作面发生的冲击地压灾害，分析了灾害发生的原因并提出了防治原则。采用数值模拟和物探方法确定了工作面在3面采空条件下的冲击地压危险时期和危险区域。冲击地压危险时期的微震监测结果表明：围岩破坏高度比非危险时期显著增大，围岩震动呈现出高能量和低频次的特征，工作面推进度宜控制在3.2 m/d以内。在冲击地压危险时期采取了工作面架间切顶爆破的措施，经电磁辐射和微震监测检验，有效降低了工作面前方煤体应力，取得了较好的解危效果，保证了工作面在冲击地压危险时期的安全。

Micro-seismic characteristic and danger-relief method in rock-burst danger period of mining face under hard and thick roof of Kuangou Mine

The cause of a rock burst in a mining face under hard and thick roof was analyzed and rock burst prevention principle was put forward on the basis of this.Rock burst danger period and danger area of the mining face surrounded by 3 gobs was obtained by numerical simulation and geophysical prospecting method.Micro seismic monitoring data show that breaking height of surrounding rock in rock burst danger period is higher than that in non danger period，rock seismic take on a characteristic of high energy and low frequency，and mining speed should be controlled below 3.2 m/d.Roof broken blasting between powered supports in mining face was adopted to reduce rock burst danger degree.Electromagnetic radiation and micro seismic monitoring show that blasting effect is perfect and coal stress ahead of mining face is reduced effectively.Mining safety in rock burst danger period is ensured.