Abstract: With the side-slope of Jinping hydropower station as a example, the theory of fluid-solid coupling is introduced into slope stability analysis. The variation and regularity of hydrodynamic pressure and safety factor of side slope in the presence of different depths of rainfall infiltration are analyzed by using numerical analysis software SLIDE. A method of stability assessment for slopes undergone rainfall infiltration and drainage consolidation is put forward. Results show that with the atomised rainfall infiltration, the hydrodynamic pressure shows a trend of increasing and the safety coefficient shows a trend of decreasing. After 3 days of rainfall infiltration, the lower part of the slope has reached a state of saturation. Continuous atomised rain has little influence on the groundwater level in the lower part of the slope, and a stable water flow is formed, so that the safety coefficient does not change too much. Moreover, the slope stability cannot be assessed comprehensively by using fixed soil parameters, because the variability and correlation of soil shear strength parameters c and φ are important factors of slope reliability index.

Key words: slope at Jinping hydropower station, rainfall infiltration, fluid-solid theory, finite element analysis, landslide analysis