微震活动对岩质开挖边坡影响研究

Influence of Microseismic Activity on Rock Cutting Slope

针对贵州省贵安新区清杨路某岩质开挖边坡,为揭示其在开挖过程中内部岩体微震活动的影响,以岩石破裂过程分析系统RFPA2D-SRM为研究手段,分析了静应力作用下的边坡失稳破坏机制;并采用IMS微震设备建立了爆破震动下的边坡微震监测系统。研究结果表明:静应力作用下边坡具有较高的稳定系数;爆破诱发了边坡内部岩体呈长条带分布的大量微震事件产生,最大位移为2.56×10-4m,出现在四级台阶岩体内部,RFPA模拟出的潜在滑移面与微震事件空间分布特征整体上具有良好的一致性。

Focusing on a rock cutting slope located at Qingyang road in Gui＇ an new area of Guizhou province, the failure mechanism of slope was analyzed under static stress with RFPA2D-SRM software, in order to reveal the influence of microseismic activity occurring in inner rock masses on slope during excavation. Then the slope microseismic monitoring system was established by IMS monitoring equipment to monitor the law of microseismic activity of slope under the blasting vibration. Results show that the slope has a relatively high stability coefficient under static stress. The blasting vibration induces the occurrence of a large number of microseismic events in strip distribution in the internal slope. The maximum displacement which appears at the inner rock body of four-step sidestep of slope is 2.56× 10 -4m. And the potential slip surface of slope simulated by RFPA has good agreement with the spatial distribution characteristics of microseismic events on the whole.