Chapter
Apr 26, 2012
Modeling Anisotropic, Debonding, and Viscous Behaviors of Natural Soft Clays
Publication: Soil Behavior and Geo-Micromechanics
Abstract
A new viscoplastic model is developed extended from overstress theory of Perzyna. A scaling function based on the experimental results of constant strain-rate oedometer tests is adopted, which allows viscoplastic strain-rate occurring wherever the stress state is inside or outside of the reference surface. The inherent and induced anisotropy is incorporated using the formulations of yield surface and its rotation of S-CLAY1. The bonds are progressively destroyed by plastic straining by incorporating the concept of an intrinsic yield surface. No additional test is needed for determining all model parameters compared to the Modified Cam Clay model, and the parameters determination is straightforward. The experimental verification is carried out with reference to the constant strain-rate and creep tests on two natural clays.
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© 2010 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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Research Fellow, Research Institute in Civil and Mechanical Engineering, Ecole Centrale de Nantes, 44300 France.E-mail: [email protected]
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