TWO SURFACE MODEL FOR SOILS WITH INDUCED ANISOTROPY

In order to evaluate the stress-strain behaviour of anisotropically consolidated and over-consolidated soils in a limited stress region, an elasto-plastic constitutive model, taking account of anisotropy effects induced by the initial consolidation, were developed based on the bounding suface plasticity. The model proposed consists of a set of bounding surface, loading surface, plastic potential and hardening modulus. The model contains nin experimental parameters which are easily determined from a few conventional triaxial tests. It was shown that the model was able to reasonably represents the stress-dilatancy properties of over-consolidated sand.