Based on the isotropic elastoplastic damage and Prevost model theory

a new dynamic elastoplastic damage model for saturated soft clay under undrained cyclic loading is presented. The new model combines isotropic hardening

kinematic hardening and isotropic damage. Then the damage evolution equation is established according to the accumulative plastic deviatoric strain to describe the destruction of the soft clay under cyclic loading. Finally

the validity of this model is confirmed by simulating cyclic triaxial test. It is shown that the new model can preferably depict the deformation

pore pressure variation and modulus damage of the saturated soft clay subjected to the cyclic loading.