Abstract
For applying the Extended SMP criterion to elastoplastic models for cohesive-frictional materials, a transformed stress based on the criterion is proposed, which is determined by making the criterion become a cone having the axis as the space diagonal in the transformed principal stress space. Furthermore, an elastoplastic model for geomaterials is presented, which takes the following three characteristics of goematerials into consideration. The first is strength and deformation characteristics in 3D stress; the second is dilatancy characteristics; the third is confining-pressure dependency of strength and deformation. The model is capable of predicting the stress: strain relations of cohesive-frictional materials and granular materials in 3D stress and a wide range of the confining pressure.
