Abstract
Water infiltration is an important actor causing a bank slope failure, and the development of unsaturated soils mechanics has provided a new theoretical basis and corresponding analysis method for studying the effects on slope stability of reservoir water infiltration. The three-dimensional terrain and structure of slope are also the essential influencing factors in its stability analysis. In the paper, the pore water pressure fields are computed by simulation of unsaturated seepage to ascertain the stress and strain distributions of three-dimensional slope based on the constitutive model of unsaturated soils, then the contribution of matric suction to shear strength is considered and three-dimensional stability analysis methods of unsaturated soils slope are performed to evaluate the safety factor (Fs). Taking Xietan landslide in Three Gorges reservoir area as the example, the result shows that its deformation and stability are seriously affected by reservoir water level change, and variation rules of slope stability are consistent with the dispatch of reservoir water.
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