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Plastic anisotropy of soft reconstituted clays

Karstunen, M. and Koskinen, M. and , University of Strathclyde and , City of Helsinki and , EC HPRN-CT-1999-00049 (Funder) and , EC MRTN-CT-2004-512120 (Funder) and , Academy of Finland (Grants 53936 and 78569) (Funder) and , Finnish Road Administration (Funder) (2008) Plastic anisotropy of soft reconstituted clays. Canadian Geotechnical Journal, 45 (3). pp. 314-328. ISSN 0008-3674

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Abstract

The aim of the paper is to extend the experimental validation of the S-CLAY1 model, which is a recently proposed elastoplastic constitutive model that accounts for initial and plastic strain-induced anisotropy. Drained stress path controlled tests were performed on reconstituted samples of four Finnish clays to study the effects of anisotropy in the absence of the complexities of structure present in natural undisturbed clays. Each test involved several loading, unloading, and reloading stages with different values of stress ratio and, hence, induced noticeable changes in the fabric anisotropy. Comparisons between test results and model predictions with the S-CLAY1 model and the modified Cam clay model demonstrate that despite its simplicity, the S-CLAY1 model can provide excellent predictions of the behaviour of unstructured soil.