Stability Evaluation of Huangtupo Riverside Slump I Landslide Based on Soil-Water Interaction

The impoundment of Three Gorges Reservoir in China has adversely influenced the stability of the landslide by periodic water level fluctuation, which has been a worldwide issue. The hydrologic action has induced changes in the seep-age field and deterioration in sliding zone soil. Taking the Huangtupo landslide as a case, this study experientially investigates the strength weakening laws of the sliding zone soil, and a numerical simulation by Geostudio is also performed to evaluate the landslide stability. It shows that: (1) the deterioration in sliding zone soil caused by soil–water interaction can be characterized with an exponential function model. (2) the seepage field, displacement, and stability are closely related to the scheduling of reservoir water level. In the rapid decline period, the factor of safety is also the lowest, and the displacement increases significantly. (3) combined with the weakening model of shear strength, the landslide behaves as a step-like deformation and has the potential to move longer distances in the long-term hydrologic changes.