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Shear‐Rate‐Dependent Behavior of Clayey Bimaterial Interfaces at Landslide Stress Levels

The behavior of reactivated and first‐failure landslides after large displacements is controlled by the available shear resistance in a shear zone and/or along slip surfaces, such as a soil‐bedrock interface. Among the factors influencing the resistance parameter, the dependence on the shear rate can trigger catastrophic evolution (rate‐weakening) or exert a slow‐down feedback (rate‐strengthening) upon stress perturbation. We present ring‐shear test results, performed under various normal stresses and shear rates, on clayey soils from a landslide shear zone, on its parent lithology and other lithologies, and on clay‐rock interface samples. We find that depending on the materials in contact, the normal stress, and the stress history, the shear‐rate‐dependent behaviors differ. We discuss possible models and underlying mechanisms for the time‐dependent behavior of landslides in clay soils.