Evaluating the stability of Outang landslide in the Three Gorges Reservoir area considering the mechanical behavior with large deformation of the slip zone

The large deformation mechanical properties of slip zone soil play an important role in the stability evolution landslide. traditional landslide evaluation method can only be used to calculate a single factor, which cannot dynamically evaluate as it evolves. from Outang Three Gorges Reservoir area are investigated by indoor repeated direct shear test. Based on damage theory, behavior with displacement is analyzed, and model describing relationship between stress accordance mechanism established. Then, evaluated skillfully combining residual thrust method. results show that has obvious softening constant strength under condition deformation. clear physical meaning reflect soil, consistent test results. factor gradually decreases tends moves. evolving strain water level reduction effective anti-sliding section influence reservoir water. It suggested active measures should taken time prevention control landslide, construction drainage engineering paid attention for large-scale bank landslides.