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Modelling of short-term interactions between concrete support and the excavated damage zone around galleries drilled in Callovo–Oxfordian claystone

Modelling of short-term interactions between concrete support and the excavated damage zone around galleries drilled in Callovo–Oxfordian claystone
Modelling of short-term interactions between concrete support and the excavated damage zone around galleries drilled in Callovo–Oxfordian claystone
Production of energy from nuclear power plants generates high-level radioactive nuclear waste, harmful during dozens of 1000 years. Deep geological disposal of nuclear waste represents a 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 drilling 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 hydro-mechanical 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 and stress field). The effect of shotcrete hydration evolution, spraying time, and use of compressible wedges is studied to determine their relative influence.
COX, FEM modelling, Nuclear waste, Numerical modelling, Sprayed concrete
1735-0522
1-18
Argilaga, Albert
a0c3a7db-48f1-4a17-998e-45a7e8733fae
Collin, Frèdèric
6d45bd42-48f2-4ca9-9ff6-c5805072e92c
Lacarrière, Laurie
531640e5-6552-45bf-a15e-dc0999d1a85a
Charlier, Robert
3bba8221-b05d-431a-8a41-40f1b5dcc7e8
Armand, Gilles
0e1aefc5-1107-4b6a-8139-67a2045e2a13
Cerfontaine, Benjamin
0730daf4-9d6b-4f2d-a848-a3fc54505a02
Argilaga, Albert
a0c3a7db-48f1-4a17-998e-45a7e8733fae
Collin, Frèdèric
6d45bd42-48f2-4ca9-9ff6-c5805072e92c
Lacarrière, Laurie
531640e5-6552-45bf-a15e-dc0999d1a85a
Charlier, Robert
3bba8221-b05d-431a-8a41-40f1b5dcc7e8
Armand, Gilles
0e1aefc5-1107-4b6a-8139-67a2045e2a13
Cerfontaine, Benjamin
0730daf4-9d6b-4f2d-a848-a3fc54505a02

Argilaga, Albert, Collin, Frèdèric, Lacarrière, Laurie, Charlier, Robert, Armand, Gilles and Cerfontaine, Benjamin (2019) Modelling of short-term interactions between concrete support and the excavated damage zone around galleries drilled in Callovo–Oxfordian claystone. International Journal of Civil Engineering, 17 (1), 1-18. (doi:10.1007/s40999-018-0317-9).

Record type: Article

Abstract

Production of energy from nuclear power plants generates high-level radioactive nuclear waste, harmful during dozens of 1000 years. Deep geological disposal of nuclear waste represents a 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 drilling 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 hydro-mechanical 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 and stress field). The effect of shotcrete hydration evolution, spraying time, and use of compressible wedges is studied to determine their relative influence.

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More information

Accepted/In Press date: 2 May 2018
e-pub ahead of print date: 15 May 2018
Published date: 30 January 2019
Keywords: COX, FEM modelling, Nuclear waste, Numerical modelling, Sprayed concrete

Identifiers

Local EPrints ID: 444199
URI: http://eprints.soton.ac.uk/id/eprint/444199
ISSN: 1735-0522
PURE UUID: c48fb876-aad8-4329-b8c5-ada541420bbb
ORCID for Benjamin Cerfontaine: ORCID iD orcid.org/0000-0002-4833-9412

Catalogue record

Date deposited: 01 Oct 2020 16:34
Last modified: 18 Feb 2021 17:42

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Contributors

Author: Albert Argilaga
Author: Frèdèric Collin
Author: Laurie Lacarrière
Author: Robert Charlier
Author: Gilles Armand

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