![]() ![]() The high water sensitivity and low permeability of fine grained soil play an important role in the re-deformation of deposits slope. The first slip deformation is greatly affected by the buoyancy weight-reducing effect, and the permeability of soil and variation in the water level are the factors controlling slope deformation initiation. The results indicate that the deformation of the large-scale composite deposits is a staged sliding mode during the impoundment process. Combined with numerical simulation, the failure mechanism of the composite deposits during reservoir water level variations was studied. Taking large-scale composite deposits located on the Lancang River in Southwest China as a study case, the origin of the deposits was analyzed based on the field investigation and a multi-material model was established in the physical model test. ![]() Reservoir landslides greatly threaten the safety of reservoir area. The failure of slope caused by variations in water levels on both banks of reservoirs is common. ![]()
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