Abstract:

Based on UH model for overconsolidated (OC) clays and the concept of asymptotic state, an asymptotic state constitutive model for saturated sand is developed to be an asymptotic state constitutive model for overconsolidated clays to describe the overconsolidated and asymptotic state behaviors of clays. The proposed model can be applied conveniently to three-dimensional stress states by using transformed stress method. Compared with Cam-clay model, the proposed model is simple, and it only requires one additional soil parameter which is the slope of the Hvorslev envelope. The model can model many characteristics of clays well, including strain hardening and softening, critical state, stress dilatancy, path dependency, and asymptotic state behaviour.

Key words: asymptotic state, overconsolidated clays, constitutive model, three-dimension