A plastic model based on the bounding surface formulation for cyclic behavior of soil

Cyclic behavior of saturated soil under cyclic loading, such as earthquake, is one significant cause of the strain accumulation which can lead to the foundation destruction. This paper presents the relationship between hardening rules in the multi-surface plasticity and hardening function in the bounding surface plasticity, because both of them need to calculate the plastic modulus at every current stress state, applying the newly developed hardening rule into the hardening function to calculate the variable plastic modulus, this new idea adds the adversity of plasticity model, and a new bounding surface is established. The simulation result of undrained triaxial test verified the reliability of the new bounding surface model. (paper)