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This paper deals with the plastic behaviour of partially saturated soils by modifying an existing model for fully saturated soils. The saturated soil model, formulated in the framework of generalized plasticity, considers volumetric as well as deviatoric strain hardening and takes account of the memory of past stress history and possible limit states. The generalization of the existing model to simulate the experimentally observed behaviour of partially saturated soils has been obtained by introducing Bishop's stress and suction as independent stress parameters and by modifying the hardening parameter and the yield condition to take into account the role of suction.

Le comportement plastique des sols pardellement saturés a été étudié en modifant un modèle initialement développé pour les sole saturés. Le modèle des sols saturés, con¸u dans un cadre de plasdcité généralisée, étudle l'écrouissage des déformations volumétriques et déviatoriques et dent compte de la mémoire du matériau concernant l'historique des contraintes et des éats limites auquels il aurait pu avoir étésoumis. La généralisation de cc modèle aux sole pardellement saturés testés se fait par introduction de la contrainte de Bishop et de la succion, en tant que paramètres de contrainte indépendants, et par modification des parametres d'écrouissage et des conditions aux limites, permettant ainsi de prendre en compte le rôle de la succion.

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