爆破振动在充填体中的传播规律研究

利用阿舍勒铜矿现有微震监测系统,在试验采场矿体和侧帮充填体内分别布置微震传感器,进行现场爆破振动测试,通过对实测数据收集并结合动载荷振动传播规律,计算得出爆破振动波在矿体中和充填体中的衰减指数分别为1.361和3.179,进而得到阿舍勒铜矿当前矿体、围岩条件下的振动波传播方程。根据爆轰压理论,分析和论证了采场爆破振动对两侧充填体稳定性的影响,最后计算得出了二步骤采场爆破孔网参数中的极限孔边距为1.5 m。

Propagation Law of Blasting Vibration in Backfill

An on-site blasting vibration test was performed by using an existing microseismic monitoring system in Ashele Copper Mine, with microseismic sensors arranged in the ore body of the tested stope and on the side wall of backfill. Based on the practically measured data in combination with the propagation law of dynamic load vibration, attenuation exponents of blasting vibration wave in the orebody and backfill were calculated to be 1.361 and 3.179 respectively. Then, the vibration wave propagation equation under the existing orebody and surrounding rock conditions in Ashele Copper Mine was obtained. According to the detonation pressure theory, the influence of blasting vibration on the stability of backfill on both sides of stope was analyzed and verified. Finally, the limited borehole spacing for the blasting network in a two-step stope blasting operation was calculated to be 1.5 m.