LABORATORY STUDY ON CREEP BEHAVIOR AND CONSTITUTIVE MODEL OF SOFT SOIL IN DEZHOU

The consolidation undrained triaxial shear creep tests are performed on Dezhou soft soil under different confining pressures with TSS10 rheometer. The relationships of axial strain and creep stain rate with stress and time are obtained. The effect of soft soil property on its creep behavior is analyzed. The extended Maxwell model is established. The results show that nonlinear creep characteristic is obviously described by creep deformation of Dezhou soft soil. The creep deformation in the range of high deviatoric stress is greater than that in the range of low deviatoric stress. Fractional creep element theory is introduced. The fractional extended Maxwell model is advised. The extended Maxwell model parameters of Dezhou soft soil are solved, which can predict creep deformation of Dezhou soft soil well.