The purpose of this paper is to introduce some mathematical techniques which prove to be valuable in the constitutive modelling of soils. All the developments are related to an approach to constitutive modelling called hyperplasticity, in which strong emphasis ...

Critical state models are highly successful in reproducing the behavior of soft clays as far as the major differences between elastic and plastic behavior are concerned. However, they are not able to model the non-linear behavior of soils at small strains. ...