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Couplages hydromécaniques en milieu poreux non saturé avec changement de phase. Application au retrait de dessiccation

Abstract : The target of this research is to set up a unified and coherent working frame basing upon the rigorous principles of thermodynamics and making it possible to modell a large class of physical phenomena acting in unsaturated porous media, as well as the related interactions with the mechanical state of the structures. This class corresponds to reactive phenomena among which one finds the phase change (desiccation) for which the whole of its subsequent actions (creep but essentially shrinkage) is modelled and which will be treated as a specific application example. The first chapter recalls the bases of the adopted description of the porous medium as well as the global thermodynamical frame which underlays the whole modelling. Chapter II deals with the -mainly new- formulation and the identification of a non linear elastic constitutive law of the medium involved. Various reflexions elements related to the microscopic behaviours of the components and to experiments have orientated the modell towards some more limitative hypotheses making it possible to have a complete and explicit determination of a law for the macroscopic behaviour. Chapter IV and V are examples of application: chapter IV studies the problem of shrinkage and creep in a coupled linear elastic behaviour. Chapter V is limited to the case of shrinkage treated by a numerical application of the whole non linear elastic modell. The results obtained are in good agreement with the corresponding experiments.
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Thierry Lassabatère. Couplages hydromécaniques en milieu poreux non saturé avec changement de phase. Application au retrait de dessiccation. Mécanique [physics.med-ph]. Ecole Nationale des Ponts et Chaussées, 1994. Français. ⟨tel-00523300⟩

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