Stability and Seismic Behavior of Landslide with Deep Overburden Layer in Kala Hydropower Station, China

Landslide induced by earthquakes is one of serious seismic secondary disasters. For some large-scale landslide as discussed in the study, both rigid limit equilibrium method and dynamic finite element method are applied to comparatively analyze the stability against sliding under typical working conditions, and to reveal dynamic response characteristics. Results show that rainfall and earthquake have significant influences on the stability of landslide mass, and the safety factors under rainfall and seismic conditions do not satisfy relevant specifications. The similar results are obtained by dynamic finite element method, but the safety factors are larger than that of rigid limit equilibrium method. The landslide belongs to thrust load caused landslide, featuring upper tension damage and lower shear damage. Some measures, such as cutting slope and reducing load, shear tunnel, anchor tunnel, are recommended to reinforce the landslide mass.