Influence of Permeability Behavior on the Seepage Field and Stability of Reservoir Landslide

The changes of underwater level have great impacts on the seepage field and the stability of reservoir landslide. The permeability coefficient is the principal factor that impacts on the changes of underwater. Based on the landslide in Three Gorges Reservoir area, the computing model was established to analyze the change law of seepage field and stability with the change of permeability coefficient. The results show that when the permeability coefficient is relatively large, with gradual increase of the degree of submersed slip mass, its stability decrease gently and then sharply. When the permeability coefficient is moderate, its stability keep constant and then decrease slightly. When the permeability coefficient is small, its stability increase dramatically and then gently.