关键词: 库岸滑坡稳定; 赋存环境; 库水位涨落; 极限平衡; 稳定性分析; 干海子滑坡体; 溪洛渡水电站;

Abstract: The occurrence environment directly determines stability of a landslide. The fluctuation of the reservoir water level, heavy rain and earthquake are the key factors affecting the stability of a landslide. The Ganhaizi landslide is located in the reservoir area of the Xiluodu Hydropower Station. The stability of the landslide during the reservoir water dispatching process is the key to ensuring the healthy operation of the Xiluodu Hydropower Project. Based on the on-site deformation monitoring data of the Ganhaizi landslide, using the two-dimensional limit equilibrium analysis method, the stability analysis of the landslide body during the construction, impoundment and operation periods of the hydropower station were carried out, and the impact of the occurrence environment on the stability of the Ganhaizi landslide was evaluated and the possible failure mode, scale and critical condition were determined. Studies have shown that the safety factor of the landslide front edge is significantly lower than the overall landslide and the central landslide. As the reservoir water level rises during the water storage period, the safety factor of the landslide decreases, resulting in an increase in the risk of front edge bank collapse; in one operation cycle, the most unstable condition of the landslide is a time when the reservoir water level drops and the rainstorm is encountered; when there is an earthquake, the possibility of landslide instability at the front edge further increases. The research results have certain reference significance for the evaluation and prediction of the deformation failure mechanism and stability of landslides.

Key words: bankside slope; occurrence environment; reservoir water level fluctuation; limit equilibrium; stability analysis; Ganhaizi landslide; Xiluodu Reservoir;