Abstract
The purpose of this paper is to describe an elastoplastic model for unsaturated soils. In the formulation of elastoplastic model for unsaturated soils, it is necessary to consider two suction effects. Authors have already proposed some models for unsaturated soils. Though these models are suitable to express unsaturated behavior for clayey soils, they are not to express that of sandy and silty soils. The models were here is modified to express unsaturated behavior of clayey, sandy and silty soils. The modification is accomplished by modeling state surfaces whose shapes depend on the type of soils. The model was formulated on the basis of cyclic plasticity. The verification of the model was done simulating triaxial compression tests for some soils. The simulation results showed good agreements to the experimental ones.
