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Développements théorique et numérique d'un modèle multiphasique pour le calcul des ouvrages renforcés par inclusions

Abstract : The numerical simulation of the behaviour as well as the stability analysis of geotechni cal structures reinforced by linear "rigid" or "flexible" inclusions, where shear and flexural behaviour is to be accounted for or not, remains a difficult task, due to the strong heterogeneity of the reinforced soil, combined with the relatively high number of inclusions, and their slenderness. An alternative approach, based on the so-called "multiphase" model, makes it possible to overcome such numerical difficulties and thus devise engineering design methods. The present work is concerned with the theoretical and numerical developments of such an approach, taking into account not only the shear and flexural effects of inclusions, but also the different types of interaction between the latter and the surrounding soil. The first part is devoted to the construction of the yield design approaches and to the elastoplastic implementation of the multiphase model of the structures reinforced by "flexible" inclusions, which is then applied to the stability analysis of reinforced earth structures. In the second part, the yield design approach and finite element code are then extended in order to account for the shear and flexural effects of inclusions. The most complete version of the multiphase model is applied to simulate the behaviour of a foundation reinforced by "rigid" inclusions, subjected to an earthquake-induced lateral loading. Finally, starting from the idea to optimize the reinforcement scheme of the structure treated in the second part, by inclining the inclusions, a "three-phase" model is formulated and developed. This model is aimed at describing the macroscopic behaviour of soils reinforced by two families of inclusions having different orientations.
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  • HAL Id : tel-00467893, version 1

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Quang Thai Son. Développements théorique et numérique d'un modèle multiphasique pour le calcul des ouvrages renforcés par inclusions. Matériaux. Ecole Nationale des Ponts et Chaussées, 2009. Français. ⟨tel-00467893⟩

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