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Modélisation numérique du comportement différé des cavités souterraines

Abstract : The subject of this present work is the numerical modelling of time-dependent behaviour of deep tunnel and waste disposal cavities, which are excavated in creeping rocks. After a wide bibliographic review, this research is composed of three main other parts. First of all, from a theoretical point of view, the Lemaitre's viscoplastic model was implemented in the FLAC 2D finite-difference code. Particular attention was paid to the stability of the numerical solution for such an explicit mode of resolution. Related to the circular tunnel in a plane strain configuration, the time-dependent analytical expression was also developed for this law. Secondly, an experimental study was carried out using relaxation tests and constant strain rate tests, which were performed on claystone samples from the East side (France). The aim is the identification of creep mechanical parameters for Lemaitre's model, in order to predict long-term behaviour. Besides, microscopic analysis of thin rock sections was also made so as to understand micromechanisms of time-dependent deformation. Then, the reconnaissance gallery from the Mont Terri site (Switzerland) was studied. We succeed in fitting Lemaitre model parameters on in situ convergence measurements. Thus, the method resulting from this case study was applied to determine long-term behaviour of deep waste disposal cavities, with the start of the E-REP experiment in Bure laboratory (East of France), in collaboration with ANDRA.
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https://tel.archives-ouvertes.fr/tel-00001546
Contributor : Eric Boidy <>
Submitted on : Thursday, August 8, 2002 - 3:33:07 PM
Last modification on : Thursday, November 19, 2020 - 3:54:37 PM
Long-term archiving on: : Friday, April 2, 2010 - 7:58:05 PM

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  • HAL Id : tel-00001546, version 1

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Eric Boidy. Modélisation numérique du comportement différé des cavités souterraines. Sciences de l'ingénieur [physics]. Université Joseph-Fourier - Grenoble I, 2002. Français. ⟨tel-00001546⟩

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