卡拉水电站大坝坝肩左岸为高陡的反倾向层状岩质高边坡，谷坡高度接近1000m，边坡的稳定性直接关系到坝址的选取和工程造价。本文利用有限元强度折减法和刚体极限平衡法，对左岸坝肩边坡在天然状态下和开挖成型条件下多种工况的坡体稳定性进行了研究，并利用有限单元法对边坡可能的施工方案进行了敏感性分析，得出如下结论：1）边坡天然状态下和开挖加固条件下开挖范围内坡体安全系数均大于1.0，但在暴雨工况下其坡顶开挖范围外的部分坡体安全系数为0.95，存在局部失稳的可能性；2）拟采取的开挖加固方案能有效的减小开挖坡体范围内屈服区，但是对坡顶开挖范围外的坡体无太大影响。本文的研究成果为实际工程提供了参考。

The abutment of Kala Hydropower project, which is located at the middle of Yalongjiang River in Sichuan Province of China, is made of a high rock slope and the slope stability in the period of construction and operation is one of the key technical issues concerned by the designers. The slope stability is directly related to the dam location and project cost. The Finite Element Method (FEM) and Limit Equilibrium Theory (LET) were adopted to analyze the stability of the left bank slope before excavation and during its construction period under several loading conditions and the sensitivity analysis of the different construction schemes, which will be carried out, was conducted. Some conclusions are drawn as follows: Firstly, the safety factor of the slope in the natural state and the reinforcement-excavation state are beyond 1.0,,but, the top part of slope exceeding the excavating range is 0.95 and it may be instable; Secondly, the planned excavation scheme can sufficiently restrain the yield zones of the slope excavated, however, it barely inflected the top slope unexcavated. The result of this paper provides a reference for the actual project.