EXAMINATION OF MODELS FOR TIME DEPENDENT BEHAVIOR OF SOILS

Abstract eng:
Various constitutive relations have been proposed to represent time-dependent deformation behavior of soils. They can be divided into (1) Empirical models (2) Rheological models and (3) General stress-strain time models. In this paper special emphasis is placed on elasto-viscoplastic models that combine inviscid elastic and time dependent plastic behavior. Elasto-viscoplastic models belong to the category General stress-strain-time models and they can mainly be divided into (1) Models based on the concept of overstress and (2) Models based on the concept of non-stationary flow surface theory. A short presentation of the theories is given. Furthermore, the structure of the theories is described and compared. Finally, it is concluded that existing models in principle are able to model clay, whereas time effects for sand cannot be described by means of existing models.

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