Super-subloading surface modified cam-clay model considering cohesion and its numerical implementation

The definitions of overconsolidation state parameter R and structural property state parameter R^z.ast; is further perfected firstly and a more popular derivation of this model is offered. Then the numerical implementation is completed based on the semi-implicit algorithm and the constitutive subroutine is compiled by using UMAT in ABAQUS for the improved model considering the cohesion. Finally, the complicated mechanical properties of the overconsolidated and undisturbed soil are simulated under different conditions and various loading types. The result implies that the model owns excellent simulation capabilities and the UMAT subroutine ensures sufficient accuracy and stability. Therefore, the key step to apply this constitutive model into engineering practice has been successfully accomplished.