Residual-state creep behavior of typical clayey soils

Few researchers have studied the creeping displacement behavior of clayey soils using a triaxial compression cell and oedometer; however, in most cases, they have concentrated on the pre-peak state of shear. Clayey soil from a landslide is assumed to have already reached the residual-state, necessitating a study on residual strength to understand the creeping displacement behavior of clayey soils from landslides. In this work, an existing torsional ring shear apparatus was modified to understand the creeping displacement behaviors of typical clayey soil. The newly developed creep test apparatus is capable of measuring the displacement with respect to time under the application of a constant creep stress. This paper focuses mainly on residual-state creep behaviors of typical clayey soils. Residual-state creep failure prediction curves are also proposed, which may be used to predict failure time and displacement of creeping landslides in the future.