An insight into the thermodynamics-based elasto-plastic coupling of clays: role of voids and fabric anisotropy
An insight into the thermodynamics-based elasto-plastic coupling of clays: role of voids and fabric anisotropy
This paper analyses the implications of two forms of isotropic and anisotropic thermodynamic-based elasto-plastic coupling on the constitutive response of clays. To this purpose, the single surface thermodynamic-based constitutive model for clays SANICLAY-T is adopted. Its hierarchical structure allows to introduce increasing complexity depending on the specific application, while the proper manipulation of potential functions leads to new forms of elasto-plastic coupling, driven by scalar and tensorial entities, characterised by a mutual influence between the elastic and plastic behaviour. The thermodynamic approach allows some relevant features of the phenomenon to be highlighted in more detail as compared to what conventionally derived from the elasto-plasticity theory, with particular reference to the effects of coupling on the yield domain in the Cauchy stress space and the resulting non-associated flow rule. Numerical simulations of laboratory tests illustrate the predictive capability of the model while ad hoc numerical simulations highlight the evolving and transient character of the anisotropic elasto-plastic coupling and its implications on the critical state.
F. Rollo; Angelo Amorosi
10th European Conference on Numerical Methods in Geotechnical Engineering (NUMGE2023)
1. Constitutive modelling for saturated and unsaturated soils
https://doi.org/10.53243/NUMGE2023-338
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