Abstract: Drained triaxial compression creep tests of sliding zone soils of Xietan landslide in the Three Gorges area have been carried out. Based on these tests, given is Singh-Mitchell’s creep model, in which exponential function is adopted for shear stress-strain behavior and a power function for strain-time behavior. A modified Singh-Mitchell’s shear stress-strain-time behavior is presented too, in which strain-time power behavior has been simulated by subsection. Through using the different power values , which correspond to the three phases of creep, that is , damply phase, steady phase and invariable phase respectively; the capability of simulation the creep characters of the sliding zone clay can be greatly improved. So for the clay which has less creep characters, modified Singh-Mitchell’s creep model is more reasonable than Singh-Mitchell’s creep model.

Key words: sliding zone soils, drained triaxial creep test, Singh-Mitchell’s creep function, shear stress-stain-time behavior, modified Singh-Mitchell’s creep function