Approche par une méthode d’homogénéisation du comportement des ouvrages en sols renforcés par colonnes ou tranchées

Abstract : This work takes place in the context of soil reinforcement techniques, aimed at improving the mechanical performances of poor quality grounds. Among these techniques, the use of soft inclusions taking the form of columns or cross trenches has known important developments. Even if the aspects relative to their construction process are presently well mastered, the design methods of such reinforced soil structures still remain to be greatly improved. The present work advocates the use of the homogenization method for assessing the global behavior of reinforced soil structures, both in the context of linear elasticity (stiffness properties) and in the framework of yield design (strength properties). Taking into account the geometrical periodicity of the various reinforcement configurations, we thus determine the behavior of the reinforced soils first locally and then at the global scale. To assess the strength capacities of reinforced soil structures, the static and kinematic approaches of the yield design theory are performed analytically or numerically depending on the kind of reinforcing material which is used. Adopting innovative numerical formulations dedicated to this theory, we can notably evaluate the macroscopic strength domains of column as well as cross trench reinforced soils which can then be introduced in the yield design of reinforced soil structures. Two illustrative applications of this procedure are performed relating to the bearing capacity problem of a reinforced soil shallow foundation on the one hand, the stability analysis of an embankment on the other hand
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Maxime Gueguin. Approche par une méthode d’homogénéisation du comportement des ouvrages en sols renforcés par colonnes ou tranchées. Matériaux. Université Paris-Est, 2014. Français. ⟨NNT : 2014PEST1062⟩. ⟨tel-01057009v2⟩

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