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An anisotropic elastoplastic model for soft clays

Wheeler, Simon J. and Naatanen, Anu and Karstunen, Minna and Lojander, Matti (2003) An anisotropic elastoplastic model for soft clays. Canadian Geotechnical Journal, 40 (2). pp. 403-418. ISSN 0008-3674

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Abstract

An anisotropic elastoplastic model for soft clays is presented. Experimental data from multistage drained triaxial stress path tests on Otaniemi clay from Finland provide support for the proposed shape of the yield curve and for the proposed relationship describing the change of yield curve inclination with plastic straining. Procedures are proposed for determining the initial inclination of the yield curve and the values of the two additional soil constants within the model. Comparisons of model simulations with experimental data demonstrate significant improvements in the performance of the new model over the Modified Cam Clay model. The remaining discrepancies are mainly attributable to the important role of destructuration in the sensitive Otaniemi clay.