ABSTRACT
An elastoplastic constitutive model for clay and sand is proposed, which can describe not only the typical behaviors of normally and over consolidated soils under general stress conditions, but also the behaviors of structured soils that can be found in natural deposited ground. In order to describe the behaviors of structured soils, the superloading surface concept originally proposed by Asaoka et al. (1998) is introduced. In the present model, the structured state of soil is simply defined as the difference of void ratio between the structured and the completely remolded soil under the same stress conditions. The proposed model is verified by oedometer tests on manmade structured soils. Moreover, the characteristics of the proposed model are investigated theoretically for drained and undrained triaxial tests.
