Modification of critical state models by Mohr-Coulomb criterion

In order to combine the Mohr-Coulomb criterion and the critical state models for soils, a transformed stress tensor based on the Mohr-Coulomb criterion is proposed. The new stress tensor is determined by a transformation that makes the Mohr-Coulomb criterion become a cone having an axis as the space diagonal in transformed principal stress space, and is applied to the Cam-clay and Sekiguchi-Ohta models, which are two typical isotropic and anisotropic hardening critical state models for soils, for improving modelling capability of describing soil behaviour in general stresses. The revised models give more accurately predicted results than the original ones.