Abstract: During excavation, the slope at left bank intake of Puxiqiao hydropower station collapsed and destabilized many times, and the upper slope at left dam abutment was cracking, which not only endangerd the construction safety of the dam, but also restricted the construction of diversion tunnel and flood discharge tunnel. Combined with the geological conditions and construction process, this paper analyzes the cause reasons of the collapse, calculates the stability of the intake slope and upper slope by using 2D limit-equilibrium method, determines the support measures for the slope based on the calculation results, and gives out the guiding advices on the treatment scheme of the sliding rock mass. The reinforcement construction was successful. At present, Puxiqiao hydropower station is impounded, and the slope is stable.

Key words: Puxiqiao hydropower station, intake, slope stability analysis, sliding rock mass

摘要： 普西桥水电站左岸进水口边坡在开挖过程中多次坍塌失稳，并牵引上部左坝肩边坡出现裂缝，不仅危及大坝施工安全，且制约了引水隧洞和泄洪冲沙洞施工。结合地形地质条件、施工过程对坍塌原因进行分析，采用二维刚体极限平衡法，对进水口边坡及以上左坝肩边坡稳定性进行计算，基于计算结果确定边坡深层支护措施，并对滑塌体综合治理施工方案给出指导性意见，加固施工顺利完成。目前普西桥水电站已下闸蓄水，进水口边坡状态稳定。

关键词: 普西桥水电站, 进水口, 边坡稳定性分析, 滑塌体