ABSTRACT
Rainfall and the change of groundwater seepage caused by raise of reservoir water level are the main reasons of landslide deformation. Groundwater movement in landslide mass is a kind of unsaturated and unstable seepage flow, which should be analyzed by the theory of unsaturated unstable seepage. The variation of groundwater seepage due to the change of reservoir water level and rainfall are the essential reasons of slope deformation. Great changes of groundwater table will be happened under the condition of concentrated rainfall in flood season. The coefficient of saturated and unsaturated permeability of landslide mass is the necessary parameters for conducting saturated and unsaturated unstable seepage analysis. From the numerical simulation of the seepage field of Suping landslide area under the condition of fluctuation of Three Gorges Reservoir water level, it can be found that: the groundwater table varies with the changes of the reservoir water level.
