Article (Scientific journals)
Modelling of short-term interactions between concrete support and the excavated damage zone around galleries drilled in Callovo-Oxfordian claystone
Argilaga, Albert; Collin, Frédéric; Lacarrière, Laurie et al.
2019In International Journal of Civil Engineering
Peer reviewed
 

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Abstract :
[en] Production of energy from nuclear power plants generates high-level radioactive nuclear waste, harmful during dozens of thousand years. Deep geological disposal of nuclear waste represents the most reliable solutions for its safe isolation. Confinement of radioactive wastes relies on the multi-barrier concept in which isolation is provided by a series of engineered (canister, backfill) and natural (host rock) barriers. Few underground research laboratories have been built all over the world to test and validate storage solutions. The underground drilling process of disposal drifts may generate cracks, fractures/strain localisation in shear bands within the rock surrounding the gallery especially in argillaceous rocks. These degradations affect the hydro-mechanical properties of the material, such as permeability, e.g. creating a preferential flow path for radionuclide migration. Hydraulic conductivity increase within this zone must remain limited to preserve the natural barrier. In addition galleries are currently reinforced by different types of concrete supports such as shotcrete and/or prefab elements. Their purpose is twofold: avoiding partial collapse of the tunnel during drilling operations and limiting convergence of the surrounding rock. Properties of both concrete and rock mass are time dependent, due to shotcrete hydration and hydromechanical couplings within the host rock. By the use of a hydro-mechanical coupled Finite Element Code with a Second Gradient regularization, this paper aims at investigating and predicting support and rock interactions (convergence, stress field). The effect of shotcrete hydration evolution, spraying time and use of compressible wedges is studied in order to determine their relative influence.
Disciplines :
Civil engineering
Author, co-author :
Argilaga, Albert ;  Université de Liège - ULiège > Département ArGEnCo > Géomécanique et géologie de l'ingénieur
Collin, Frédéric  ;  Université de Liège - ULiège > Département ArGEnCo > Géotechnique
Lacarrière, Laurie
Charlier, Robert ;  Université de Liège - ULiège > Département ArGEnCo > Géomécanique et géologie de l'ingénieur
Armand, Gilles;  Agence Nationale pour la Gestion des Déchets Radioactifs - ANDRA
Cerfontaine, Benjamin ;  University of Dundee
Language :
English
Title :
Modelling of short-term interactions between concrete support and the excavated damage zone around galleries drilled in Callovo-Oxfordian claystone
Publication date :
2019
Journal title :
International Journal of Civil Engineering
ISSN :
1735-0522
eISSN :
2383-3874
Publisher :
Springer
Peer reviewed :
Peer reviewed
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