北京西部山区典型危岩体危险性评价研究

Study on Risk Assessment of Typical Unstable Rock Blocks in a Mountain Area in the West of Beijing

以北京西部山区典型危岩体为例,通过现场调查、赤平投影整体稳定性评价、典型单体稳定性计算和运动轨迹数值模拟等方法,进行综合研究。结果表明:危岩带在自然工况下处于稳定-基本稳定状态,暴雨和地震工况下欠稳定;危岩体一旦发生崩塌,会以滚动、跳跃、撞击的形式威胁到坡脚处人员及设施安全。针对研究区危岩体在暴雨及地震工况下所处的稳定状态、失稳方式及危害对象的特点,提出治理建议。

Taking the typical unstable rock block in the mountainous area of western Beijing as an example,it is comprehensively studied by means of field investigation,overall stability evaluation of stereographic projection,stability calculation of typical unit and numerical simulation of motion trajectory.The results show that the unstable rock zone is in a stable-basically stable state under natural working conditions and unstable under rainstorm and earthquake conditions.Once the unstable rock block collapses,it will threaten the safety of personnel and facilities at the foot of the slope in the form of rolling,jumping and impact.According to the stable state,instability mode and hazard object characteristics of unstable rock block in the study area under rainstorm and earthquake conditions,some control suggestions are put forward.