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Etude des effets différés dans les tunnels profonds

Abstract : The study of the equilibrium of the lined tunnel is of big interest. From a mechanical point of view, it is a problem of complex interaction between two structures which have very different behaviour: the rock mass with the cavity on the one hand and the lining on the other hand. The time dependent effects which appear in a rock mass are principally due to two phenomena which can be coupled: - viscosity of the solid part ; - diffusion of the interstitial fluid through the rock mass. We first present a bibliographical survey with the different stages of the study, design and realisation of a deep tunnel project. In the second part of this dissertation, we study the influence of loading history (the speed of the tunnel advancing and the instant of lining placement) on the equilibrium of a lined tunnel driven in a monophasic viscoplastic rock mass. A simplified method of dimensioning tunnels excavated in such media is developed. We also study the hydro-mechanical coupled effects on deep tunnels driven in isotherm saturated porous media having a poro-elastic or poro-elasto-plastic behaviour. An unidimensional analytical study reveals the influence of the mechanical loading history and the hydraulic boundary conditions at the tunnel wall. Numerical simulations of the tunnel front progress, at a given rate, are carried out for an axisymmetric 2D geometry. With the generalisation of the fictitious stress, the analytical study allows to localise the equilibrium point in the (wall convergence - stress applied on the wall) plane. These results allow to make tunnel dimensioning computations with strain plane in biphasic media with more rigor.
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Submitted on : Tuesday, October 5, 2010 - 6:32:16 PM
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  • HAL Id : tel-00523617, version 1



Ismaïl Benamar. Etude des effets différés dans les tunnels profonds. Géologie appliquée. Ecole Nationale des Ponts et Chaussées, 1996. Français. ⟨tel-00523617⟩



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