(1. College of Hydraulic and Environmental Engineering，Three Gorges University，Yichang，Hubei 443002，China； 2. School of Water Resources and Hydropower，Wuhan University，Wuhan，Hubei 430072，China)
Abstract：Excavation disturbance is an important factor for engineering slopes stability，and it runs through the whole process of slope excavation. The excavation disturbance and influential factors are researched combined with the material-yard slope of left bank of Guandi hydropower station in Yalong River. Based on the analyses of slope instability mode and mechanical parameters of the rock mass，the nonlinear finite element analysis for typical slope segment including excavation process is carried out，and the excavation disturbance characters and the influential effects of slope are also obtained. The excavation disturbance includes the stress，displacement，equivalent plastic strain，etc.，and the influential effects are the parameters of the joint crack and the rocks fault，anchoring method，etc.. And then，the suggestions for reinforcement scheme of slope stability during construction period and long-term operation are proposed. The results show that the construction schemes of excavation by steps and reinforcement by steps are effective for slope stability. Anchorage supports can not only restrain deformation effectively，but also can control strength loss. Bases on the achievements，some suggestions of excavation and reinforcement scheme are presented for practical engineering. As an important case of hydropower project，the results can also be used in the treatment of excavation slope in railway construction，highway construction and open-pit slope.
