关键词: 散体滑坡, 降雨, 蠕变, 强度衰减, 饱和度

Abstract: It is universally acknowledged that soil strength degradation and creep under water-Absorption are main factors of startup of landslide.Taking Feng Jiaba landslide in Wushan as an example,owing to the physical and intensive parameters of loose soil with different saturation got from laboratory tests,the trend of stability evolvement of loose landslide under rainfall is got by using Finite Element Method to simulate through the software ANSYS.The results indicate that the point with maximum displacement is in the rear of landslide,and the value increases nonlinearly when the saturation of the soil arises.Plastic area occurs in the rear of landslide,and it enlarges continuously when the saturation arises.The stability of the landslide decreases when saturation arises,and it reaches minimum limit equilibrium state when the soil is complete saturation.As Feng Jiaba slope is at the state between instability and stability,it may develop into disaster with the permeability of prolonged continuous rainstorms and the water-dipping of Three Gorges Project's Ⅲ-phase.

Key words: loose soil landslide, rainfall, creep, strength degradation, saturation