Abstract
This paper reviews existing models of the “incremental elasticity” type for the stress/strain properties of granular materials. It is shown that, although failure of the material can be predicted, due to the nature of the stress/strain law assumed these models cannot predict the shear dilatance effect. A new model is proposed which relates shear and normal strain increments to shear and normal stress increments, including cross-coupling between shear and normal quantities. This model requires the derivation of 4 independent parameters to relate the 2 pairs of variables and test methods are presented by which these parameters can be measured. It is shown that the model predicts well the behaviour of 5 different agricultural grains over a range of stress paths in the triaxial cell.
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