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Impact du creusement des ouvrages souterrains à faible profondeur en milieu urbain

Abstract : Tunnels construction is increasingly favored as a sustainable transportation and infrastructure development system. 200km are going to be excavated only in France in the next ten years in dense urban areas.During tunnel excavation, ground movements must be controlled and well predicted to avoid any damage on existing buildings. The tunnel face moves typically instantly toward the excavation. The tunnel wall convergence is added to theface extrusion. These movements may spread to the surface of shallow tunnels leading to significant disturbances or accidental damage (differential settlement, cave-in occurrence, buildings collapse, etc.).Different parameters influence the quality of tunnels simulation and induced displacements prediction. The quality of those predictions closely depends on the choice of soil constitutive model. In this context, some widely used soil models in engineering practice not only fail to reproduce some characteristics of soil behavior on the constitutive level but also lead to shallower settlement.This PhD thesis proposes an enhanced critical state model incorporating deviatoric and volumetric hardening mechanisms adapted for tunneling simulations. This model satisfactorily reproduces the nonlinear soil response to laboratory tests and enables a more conservative tunneling design.The impact of other modeling choices is studied through 2D and 3D tunneling simulations in different configurations with the proposed soil model. Furthermore, comparison with measurements obtained from a tunnel section of the Grand Paris Project highlight the performance of the proposed model in simulating tunneling induced displacement.
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Submitted on : Thursday, February 27, 2020 - 3:49:28 PM
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  • HAL Id : tel-02493147, version 1

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Sara Rachdi. Impact du creusement des ouvrages souterrains à faible profondeur en milieu urbain. Science des sols. Université Paris sciences et lettres, 2019. Français. ⟨NNT : 2019PSLEM054⟩. ⟨tel-02493147⟩

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