ABSTRACT
An extended subloading surface model on the base of jumped kinematic hardening rule concept was proposed. In the concept, centers of similarity of subloading surfaces to the normal yield surfaces may jump to the reversed stress points whenever reverses of loadings occur. The model was introduced to the generalized elastoplastic model for unsaturated geo-materials proposed by the author. Oedometer and triaxial compression tests for an unsaturated rockfill were tried to be simulated using the elastoplastic model. The elastoplastic model could simulate the hystereses of loading and unloading, and different stress-strain curves with different suction values. However more experimental simulations are necessary to verify the model, especially in the shear process.
