Predicting the behaviour of coal wash and steel slag mixtures under triaxial conditions

The effective reuse and recycling of granular waste materials, namely coal wash (CW) and Basic Oxygen Steel slag (BOS), is economically beneficial and environmentally sustainable. Nevertheless, due to the heterogeneity of these granular waste materials, their ultimate adoption as structural fills must be supported by constitutive relationships capable of accurately describing the stress-strain behaviour under representative field loading conditions. In this paper, a critical-state-surface generalised-plasticity model is presented and its predictive capability using a single set of soil parameters is demonstrated for drained triaxial compression tests.