Abstract
Two mathematical models developed previously by Lade for the stress, strain, and strength behaviour of soils are combined in this paper. The first model, which has only an open ended conical yield surface, is modified by adding a cap yield surface. With this addition, the predictions for soil behavior in laboratory experiments are improved along the stress paths remaining within the current conical yield surface. The capabilities of the present version of the model are evaluated by comparing the calculated and measured response of soil in proportional loading, isotropic compression, and reloading in a triaxial stress path. The differences between the two versions of the work hardening model with and without a cap are illustrated.
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