STRESS-STRAIN MODEL FOR CLAYS WITH ANISOTROPIC VOID RATIO DISTRIBUTION

The porosity of soils is considered to be a directional measure and it s distribution is characterized by a functional form. This form has be en used to extend the critical state soil mechanics framework to inclu de the effects of structure in soils. A new internal plastic energy di ssipation formulation has been proposed to account for fabric arrangem ent. New expressions for the yield locus, and the plastic stress-strai n response of structural soils have been derived. The applicability of the concepts to model the plastic stress-strain behaviour of a number of soils is illustrated. The advantage of the new model is very well identified in modelling the stress-strain behaviour of K-0 consolidate d and natural clays. (C) 1998 John Wiley & Sons, Ltd.