Non-associated plasticity for soils

A brief overview is given of a non-associated plasticity theory developed for soils based on the concept of a characteristic stress state of vanishing incremental dilation, and a calibration procedure using only test data from a standard triaxial test. The capability of the model is illustrated by calibration examples and predictions made for standard triaxial tests at different confining stress levels and constant volume tests on sand. The model is found to predict stress-strain behaviour and development of volumetric strain well