Research on the Excavation, Unloading and Support Technology of the High Rock Slope in the Reservoir Area of Lianghekou Hydropower Station

高边坡具有高度大、边坡陡、失稳危害大等特点，加之水电站库区地质条件一般比较复杂，岩石高边坡的稳定性随着电站蓄水会发生一定程度的变化，甚至会产生滑坡、坍塌等地质灾害，严重影响电站蓄水进度和库区百姓的生命财产安全，因此从安全的角度出发，对高边坡开展稳定性研究，具有一定的现实价值和理论意义。本文以两河口水电站鲜水河库区扎拖特大桥左岸高边坡为研究对象，首先对扎拖左岸开展三维激光扫描，后根据边坡失稳特点对扎拖特大桥左岸开展爆破开挖卸载及支护施工。结果表明，对于不稳定的边坡，根据其潜在失稳区域和岩体特性，对其采取三维扫描技术分析、动态设计、分层开挖与实施安全监测相结合的方法可有效控制边坡变形。可供类似工程参考。High slopes are characterized by great height, steepness, and significant hazards in case of instability. Moreover, the geological conditions in the reservoir area of hydropower stations are generally complex. The stability of high rock slopes will change to a certain extent with the impoundment of the power station, and geological disasters such as landslides and collapses may even occur, which seriously affect the impoundment progress of the power station and the safety of the lives and properties of the people in the reservoir area. Therefore, from the perspective of safety, conducting research on the stability of high slopes has certain practical value and theoretical significance. This paper takes the high slope on the left bank of the Zhatuot Bridge in the Xianshui River reservoir area of the Lianghekou Hydropower Station as the research object. Firstly, 3D laser scanning is carried out on the left bank of Zhatuot. Then, according to the characteristics of slope instability, blasting excavation, unloading, and support construction are carried out on the left bank of the Zhatuot Bridge. The results show that for unstable slopes, according to their potential unstable areas and rock mass characteristics, the combination of 3D scanning technology analysis, dynamic design, layered excavation, and implementation of safety monitoring can effectively control slope deformation. This can provide a reference for similar projects.