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Modélisation numérique du comportement thermomécanique de réseaux de galeries souterraines pour le stockage des déchets radioactifs : Approche par homogénéisation

Abstract : Deep geological disposal is one of the privileged options for the storage of High Level radioactive waste. A good knowledge of the behavior and properties of the potential geological formations as well as theirs evolution in time under the effect of the stress change induced by a possible installation of storage is required.
The geological formation host will be subjected to mechanical and thermal solicitations due respectively to the excavation of the disposal tunnels and the release of heat of the canisters of radioactive waste. These thermomechanical solicitations will generate a stress relief in the host layer and disposal tunnels deformations as well as the extension of the damaged zones (EDZ) could cause local and global instabilities.
This work aims to develop calculation methods to optimize numerical modeling of the thermoelastic behavior of the disposal at a large scale and to evaluate thermomechanical disturbance induced by storage on the geological formation host. Accordingly, after a presentation of the state of knowledge on the thermomechanical aspects of the rocks related to deep storage, of numerical modelings 2D and 3D of the thermoelastic behavior of individual disposal tunnel and a network of tunnels were carried out by a discrete approach. However, this classical approach is penalizing to study the global behavior of disposal storage. To mitigate that, an approach of numerical modeling, based on homogenization of periodic structures, was proposed. Formulations as numerical procedures were worked out to calculate the effective thermoelastic behavior of an equivalent heterogeneous structure. The model, obtained by this method, was validated with existing methods of homogenization such as the self-consistent model, as well as the Hashin-Shtrikman bounds. The comparison between the effective thermoelastic behavior and current thermoelastic behavior of reference showed a good coherence of the results. For an application to deep geological storage, the effective thermoelastic properties of a network of circular tunnels could be given in 2D for various dimensions of the distance between galleries.
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https://tel.archives-ouvertes.fr/tel-00010925
Contributor : Pierre Zokimila <>
Submitted on : Tuesday, November 8, 2005 - 6:19:08 PM
Last modification on : Thursday, November 19, 2020 - 3:54:38 PM
Long-term archiving on: : Friday, November 25, 2016 - 9:55:51 AM

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  • HAL Id : tel-00010925, version 1

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Pierre Zokimila. Modélisation numérique du comportement thermomécanique de réseaux de galeries souterraines pour le stockage des déchets radioactifs : Approche par homogénéisation. Sciences de l'ingénieur [physics]. Université Joseph-Fourier - Grenoble I, 2005. Français. ⟨tel-00010925⟩

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