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SANISAND-FN: An evolving fabric-based sand model accounting for stress principal axes rotation |
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| Authors: | Alexandros L Petalas Yannis F Dafalias Achilleas G Papadimitriou |
| Institution: | 1. Department of Civil and Enviromental Engineering, University of California, Davis, California;2. Department of Civil and Enviromental Engineering, University of California, Davis, California
School of Applied Mathematical and Physical Sciences, Department of Mechanics, I. Vardoulakis Laboratory of Geomaterials, National Technical University of Athens, Zografou, Greece;3. School of Civil Engineering, Department of Geotechnical Engineering, National Technical University of Athens, Zografou, Greece |
| Abstract: | SANISAND is the name of a family of bounding surface plasticity constitutive models for sand within the framework of critical state theory, which have been able to realistically simulate the sand behavior under conventional monotonic and cyclic loading paths. In order to incorporate the important role of evolving fabric anisotropy, one such model was modified within the framework of the new anisotropic critical state theory and named SANISAND-F model. Yet the response under continuous stress principal axes rotation requires further modification to account for the effect of ensuing noncoaxiality on the dilatancy and plastic modulus. This modification is simpler than what is often proposed in the literature, since it does not incorporate an additional plastic loading mechanism and/or multiple dilatancy and plastic modulus expressions. The new model named SANISAND-FN is presented herein and is validated against published data for loading that includes drained stress principal axes rotation on Toyoura sand. |
| Keywords: | anisotropic critical state theory anisotropy bounding surface plasticity constitutive model fabric noncoaxiality |