Dilation saturation coupling

MODELLING OF THE DILATANCY - SATURATION COUPLING DURING EXCAVATION AND CONSOLIDATION OF AN UNDERGROUND STRUCTURE... 

Biot and Darcy theory shortcomings have been largely overcome by development of a coupled diffusion-dynamic formalism (de la Cruz et al. 1993, Spanos 2001, Spanos et al. 2(X)3). Porosity is treated as an explicit thermodynamic variable, so that dnumerical model development. Nevertheless, if they are solved subject to the assumption of the incompressibility of a liquid saturant, the existence of a slow wave is predicted. It is called the porosity dilation (PD) wave it is not a strain wav, it is a coupled liquid-solid displacement wave, and it has some interesting properties. 

In this article, two improved elastoplastic models taking into account dilatancy and softening, and coupled with the non-saturated approach of Bishop s effective stresses have been successfully tested. The influence of dilatancy on saturation degree and on the short-term stability of a tunnel is shown. The consequences of damage (plastic... 

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