基于正射影像的危岩体特征获取、稳定性计算和运动学模拟

Feature Acquisition,Stability Calculation and Kinematics Simulation of Perilous Rock Based on Orthophoto

采用地面调查、航测解译的方法获取了七星谷危岩带的几何特征,通过钻孔取样、室内试验获取了物理力学参数,通过运动学模拟评估了落石的威胁范围。模拟结果发现,落石高发区安全系数为0.975,暴雨工况下属于不稳定状态,其滚落距离超100 m,将会对桥梁形成冲击,最大弹跳高度约18 m,桥梁附近弹跳高度约2 m,冲击动能集中在623~1145 kJ,建议填补危岩岩腔,设置被动防护网以确保工程安全建设、运营。

The geometric characteristics of the Qixing Valley perilous rock zone were obtained by ground investigation and aerial survey interpretation.Physical and mechanical parameters were obtained through borehole sampling and laboratory tests,and threat range of rockfall was evaluated through kinematics simulation.It is found that the safety factor of the high-incidence area of rockfall is 0.975,and it is in an unstable state under heavy rain conditions.The rolling distance exceeds 100m,which will cause an impact on the bridge.The maximum bounce height is about 18m,and the bounce height near the bridge is about 2 m.The impact kinetic energyis concentrated at 623~1145 k J,it is recommended to fill the perilous rock cavity and set up passive protection nets to ensure the safe construction and operation of the expressway.