Incorporation of meta-stable structure into hypoplasticity

An existing approach to constitutive modelling of structured soils is in this paper applied to hypoplastic models. The proposed approach is based on the modification of the state boundary surface in such a way that the models predict different stress-dilatancy behaviour of structured and reference materials. The concept is applied to hypoplastic models for both clays and for granular materials. Good predictive capabilities of the modified model for clays are demonstrated, model for granular materials requires further modifications in order to take into account different small- to medium- strain behaviour of structured and reference materials.