【摘要】 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。更多还原

【Abstract】 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.更多还原