Hydromechanical couplings in the clay matrix of argilite: some methodological aspects of the atomistic-to-continuum upscaling posterReport as inadecuate




Hydromechanical couplings in the clay matrix of argilite: some methodological aspects of the atomistic-to-continuum upscaling poster - Download this document for free, or read online. Document in PDF available to download.

1 NAVIER UMR 8205 - Laboratoire Navier

Abstract : Clays are ubiquitous in civil engineering applications, from deep geological disposal of radioactive waste to petroleum engineering, all of which require a good knowledge of their mechanical properties. Swelling clays are highly sensitive to the relative humidity: increases of water content can induce significant volume increases, as well as variations of the elastic stiffness. A faithful description of the behavior of clayey materials must therefore account for the hydromechanical couplings within clays. Hydromechanical couplings within the clay matrix of argilite were investigated numerically following a multi-scale approach. At the smallest scale, the clay layers of Na-montmorillonite are characterized through Monte Carlo molecular simulations. The constitutive law of the particle a stack of clay layers is then derived through rheological models. Finally, the clay matrix is represented as a polycrystal made of clay particles and homogenized by means of numerical non-linear continuum mechanics methods. Throughout our investigations, it was realized that the atomistic-to-continuum scale transition raised non-trivial theoretical questions. In this poster, we propose to show how the output of molecular simulations can be rigorously fed into a continuum mechanics simulation. Although the issues raised in this poster are illustrated on the upscaling of Na-montmorillonite, they are of a methodological nature and have a much wider range of applications.





Author: Sébastien Brisard - Matthieu Vandamme - Benoît Carrier - Linlin Wang -

Source: https://hal.archives-ouvertes.fr/



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