Creeping Displacement Behavior of Clayey Soils in A New Creep Test Apparatus

摘要

Clayey soils from a slip surface of 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. In this study, a creep test apparatus was developed to understand the creeping displacement behavior of typical clayey soils. The newly developed creep test apparatus is capable of measuring the displacement with respect to time under the application of a constant creep stress. The ideal creep curve for a soil material is verified in the test procedure and is found to perfect matching with obtaining results. The test results on four typical clayey soils show that the creep failure begins only when the applied shear stress (i.e., creep stress) is above the residual strength and that there is no creeping effect on or below the residual strength. This paper focuses mainly on residual-state creeping displacement behavior of typical clayey soils. Residual-state creep failure prediction curves are also proposed, which may be used to predict the failure time of a creeping landslides in the future.