自然崩落法拉底爆破对底部结构稳定性影响分析

在自然崩落法开采过程中,集中拉底爆破作业产生的震动影响底部结构岩体稳定性。利用微震监测系统监测并鉴别出爆破和微震事件,对爆破前后的监测到微震事件精确定位。通过分析爆破前后底部结构岩体的微震活动,圈定出爆破震动范围和底部结构围岩薄弱区域。结果表明,爆破后底部结构附近微震事件数量明显增加,距离爆破中心120m范围内均为地压风险区域。

Analysis of the influence of undercutting blasting on the stability of bottom structure in natural caving

In the process of natural caving mining, the vibration caused by the concentrated bottom-drawing blasting affects the stability of rock mass at the bottom structure. The blasting and microseismic events can be monitored and identified by the microseismic monitoring system, and the microseismic events detected before and after blasting can be accurately located. By analyzing the microseismic activity of rock mass of the bottom structure before and after blasting, the influence range of blasting shock wave and the weak area of surrounding rock of the bottom structure are delineated. The results show that the number of microseismic events near the bottom structure increases obviously after blasting, and the area within 120m from the blasting center is the risk area of ground pressure.