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Modelling the influence of stress-strain history on the initial shear stiffness of an unsaturated compacted silt


Modelling the influence of stress-strain history on the initial shear stiffness of an unsaturated compacted silt



Canadian Geotechnical Journal = Revue Canadienne de Geotechnique 44(4): 463-472



DOI: 10.1139/t06-130

This is the follow-up paper to Vassallo et al. (2007), which discussed the experimentally observed small-strain behaviour of an unsaturated compacted silt. The influence that suction and, more in general, mean net stress--suction history has on the initial shear stiffness was analysed and ascribed to the accumulation of irreversible volumetric strains. In this study, a model able to predict the observed behaviour is proposed, based on classical unsaturated soil volumetric hardening elastoplastic formulations. Starting from the interpretation of the results relative to simple stress paths, such as preliminary equalization and loading-unloading compression, the results of "complex" stress paths, such as those including drying-wetting cycles, have subsequently been modelled by introducing some additional parameters.

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Accession: 014109546

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