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Abstract: Natural clays exhibit a significant degree of anisotropy in their fabric, which initially is
derived from the shape of the clay platelets, deposition process and one-dimensional consolidation.
Various authors have proposed anisotropic elastoplastic models involving an inclined yield surface
to reproduce anisotropic behavior of plastic nature. This paper presents a novel constitutive model
for soft structured clays that includes anisotropic behavior both of elastic and plastic nature.
The new model incorporates stress-dependent cross-anisotropic elastic behavior within the yield
surface using three independent elastic parameters because natural clays exhibit cross-anisotropic
(or transversely isotropic) behavior after deposition and consolidation. Thus, the model only
incorporates an additional variable with a clear physical meaning, namely the ratio between
horizontal and vertical stiffnesses, which can be analytically obtained from conventional laboratory
tests. The model does not consider evolution of elastic anisotropy, but laboratory results show that
large strains are necessary to cause noticeable changes in elastic anisotropic behavior. The model is
able to capture initial non-vertical effective stress paths for undrained triaxial tests and to predict
deviatoric strains during isotropic loading or unloading.
Fuente: Materials 2017, 10, 584
Editorial: MDPI AG
Año de publicación: 2017
Nº de páginas: 16
Tipo de publicación: Artículo de Revista
Proyecto español: BIA2015-67479-R
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JORGE CASTRO GONZALEZ