TRIAXIAL COMPRESSION TESTS FOR EFFECTS OF VISCOUS PROPERTY ON RESIDUAL STRENGTH OF FINE SAND

Triaxial compression tests with constant-strain-rate are performed on samples retrieved from a slope with slow movement experience. The viscous properties of the fine sand under air-dried condition are observed. The results include: (1)The rate effect, showing by the increase in strength with strain rate, is quantified by rate sensitivity coefficient. (2)The research focuses on the viscous properties at residual state, which shown by partially decay of stress jump induced by a sudden change of strain rate with the increase in displacement. The decay is quantified by using the rate sensitivity coefficient. (3)The effect of viscous property on the residual strength is shown by the rate effect and relaxation.