Abstract: Through comparative study of two different geo-models of Liangshuijing landslide, it concluded that Liangshuijing landslide is in fact a paleo-falling and sliding rock accumulation without forming a whole and continuous “sliding belt”, and the landslide is divided into two parts named as the main sliding part at middle-below and the towed part at the up in terms of the landslide structure and the accumulation sequences. Also, the deformation mechanism has been researched, coming out the conclusion that the landslide initial deformation is due to the coupling process of reservoir water softening, uplifting and the river bank slumping; while in the condition of the reservoir operation, the main influencing factor of the landslide stability is rain fall, especially storm and long-time rainfall. It is also concluded from stability study that from May 2009 the landslide has entered the state of creeping by a slow process of stress releasing. Furthermore, from the prediction analysis of stability and failure mode, there comes the results that in the condition of reservoir operation, by coupling of strong and long-time precipitation and reservoir triggered bank slumping, the surface part of the main sliding body will be sliding firstly(sliding model 1), and the sliding of the whole landslide is also possible (sliding model 2).

Key words: Three Gorges Reservoir area, the Liangshuijing landslide, geomechanical model, deformation mechanism, stability prediction