【摘要】 为提高深孔爆破措施对防治华丰煤矿冲击地压的有效性,采用微地震监测技术连续监测其1410工作面围岩破裂情况。根据采场附近岩层"破裂-应力"对应关系,得到工作面前方、侧向及垂直方向上的支承压力峰值区,由此确定深孔爆破卸压的具体参数。结果表明:卸压孔深40 m(倾向投影为4倍采高)时,爆破对煤岩的整体性破坏明显,煤岩体中积聚的弹性能得到释放。监测期间共释放能量9.47 MJ,高应力区向煤岩深部转移,采场附近形成一定的卸载区域,减弱或消除了煤岩体的冲击危险性。更多还原

【Abstract】 For the sake of improving validity of rock burst prevention in Huafeng coal mine by deep-hole blasting,microseismic events of 1410 coal mining face with strong burst trend were monitored.According to corresponding relation between fracture and stress near the stope,areas with peak abutment pressures in front,lateral and vertical directions of face were obtained.Therefore,parameters of deep-hole blasting were determined.The results show that when the hole depth was 40 m which was 4 times of mining height in inclination projection,coal and rock integrity can be destroyed significantly through blasting,that the elastic energy accumulated can be released,that release of 9.47 MJ was observed during the monitoring periode,and that an unloaded region formed near stope after high-stress areas moved deeper.更多还原