Comportement des tunnels en terrain poussant

Abstract : Squeezing behavior is characterized by large time-dependent and often anisotropic deformation during and well after excavation of tunnel and may lead to tremendous operational difficulties. The present thesis aims to deal with tunneling in squeezing ground with a special emphasis on the anisotropic behavior combining analytical and numerical approach. Following an overview on the squeezing behavior, the attention moves on the interpretation of the data monitored during the excavation of Saint-Martin-La-Porte within the Lyon-Turin railway project. The closed-formed solutions for tunnel excavated in anisotropic ground are then developed considering the complexity of tunnel cross-section, the interaction between two tunnels, the interaction ground/support and also the large strain calculation. Finally, an anisotropic creep model which includes weak planes of specific orientation embedded in a viscoplastic medium is proposed and implemented in FLac3D in order to back analyze the convergence data of Saint-Martin-La-Porte access gallery. The numerical model is also applied to the analysis of the behavior of the yield-control support systems taking account the effect of anisotropy of rock mass
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Huy Tran Manh. Comportement des tunnels en terrain poussant. Autre. Université Paris-Est, 2014. Français. ⟨NNT : 2014PEST1100⟩. ⟨tel-01135356⟩

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