北京西山安子沟某边坡崩塌稳定性评价及防治研究OA

Landslides represent the most prevalent geological disaster in the Beijing area,noted for their sudden occurrence and high concealment.This study employed unmanned aerial vehicle(UAV)oblique photogrammetry to construct high-precision 3D real-scene models,integrated with ground surveys,to identify four unstable rock masses(B1-B4).The instability modes of these unstable rock masses were analyzed using stereographic projection,and their stability was assessed via the rigid body limit equilibrium method.The kinematic behavior of the high-altitude unstable rock mass B1 was further investigated through RockFall software simulation.The results indicate that B1 and B2 are prone to toppling failure,while B3 and B4 are susceptible to falling failure,with a total estimated volume of approximately 1,410 m3.Under natural conditions,the rock masses are generally stable;however,their stability decreases significantly during rainstorms or seismic events.The movement of the B1 mass can be divided into three stages:initial rolling,falling collision,and final deposition.The simulation shows that falling rocks would bounce and roll before ultimately impacting threatened residential buildings.Based on the stability assessment,targeted and graded mitigation measures were proposed:for B1,"unstable rock removal+dual protective nets";for B2,"pumice removal+active protective nets";and active protective nets for B3 and B4.The research findings provide a scientific basis for landslide disaster prevention and control in Beijing's Western Mountains,effectively enhancing the disaster prevention capabilities of residential areas.