论文部分内容阅读
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。
In order to improve the effectiveness of deep hole blasting measures in preventing and controlling Huapock coal mine rockburst, the microseismic monitoring technique was used to continuously monitor the surrounding rock failure of its 1410 working face. According to the corresponding relation of rock mass “rupture stress ” near the stope, the support pressure peak area in front of the working face, in the lateral direction and in the vertical direction is obtained, and the specific parameters of pressure relief in deep borehole blasting are determined. The results show that when the pressure relief hole is 40 m deep and the projectile projection is 4 times of mining height, the integrity damage of coal and rock blasting is obvious, and the elastic energy accumulated in coal and rock mass can be released. During the monitoring period, a total of 9.47 MJ of energy was released. High stress areas were transferred to the deep part of coal and rock and a certain unloading area was formed near the stope to reduce or eliminate the impact risk of coal and rock mass.