ABSTRACT
In this chapter, the formulations of elastoplastic models for soils using the stress invariants (p and q) used in ordinary soil models are presented. As a three-dimensional (3D) extension of the well known one-dimensional (1D) consolidation behavior of normally consolidated clay (linear relation between e and lnσ), the original and modified Cam clay models are explained. The validity of these models in general 3D stress conditions is also discussed based on the experimental results.
