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Characterizing the mechanical behaviour of the Tournemire argillite

By
Xueqing Su
Xueqing Su
Canadian Nuclear Safety Commission, Ottawa, Ontario K1P 5S9, Canada
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Son Nguyen
Son Nguyen
Canadian Nuclear Safety Commission, Ottawa, Ontario K1P 5S9, Canada
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Ehsan Haghighat
Ehsan Haghighat
McMaster University, Hamilton, Ontario L8S 4L8, Canada
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Stanislaw Pietruszczak
Stanislaw Pietruszczak
McMaster University, Hamilton, Ontario L8S 4L8, Canada
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Denis Labrie
Denis Labrie
CanmetMINING, Natural Resources Canada, Ottawa, Ontario K1A 1M1, Canada
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Jean-Dominique Barnichon
Jean-Dominique Barnichon
Institut de Radioprotection et de Sûreté Nucléaire, 92260 Fontenay-aux-Roses, France
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Hadj Abdi
Hadj Abdi
University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
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Published:
January 01, 2017

Abstract

A laboratory programme of uniaxial, triaxial, cyclic and Brazilian tests was conducted to investigate the anisotropic mechanical behaviour of the Tournemire argillite, with different axial loading orientations with respect to the bedding planes (i.e. loading orientation angle, θ=0°, 30°, 45°, 60° and 90°). The experimental results show that both strength and deformation of the argillite are direction-dependent. Failure occurs in a brittle manner with a sudden collapse of the material strength. The failure mode exhibits localization along distinct failure planes and also depends on the loading orientation. This paper summarizes the experimental results and describes constitutive relationships that were developed in order to simulate the stress–strain behaviour of the Tournemire argillite. A microstructure tensor approach is adopted in order to take into account the anisotropic behaviour of the argillite. The identification procedure for material function and parameters is outlined, and the model is applied to simulate the set of triaxial tests performed at different levels of confining pressure and orientation of the bedding planes. It is demonstrated that the model adequately reproduces the anisotropy, the pre-peak stress–strain response and the onset of material collapse in those tests.

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Geological Society, London, Special Publications

Radioactive Waste Confinement: Clays in Natural and Engineered Barriers

S. Norris
S. Norris
Radioactive Waste Management, UK
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J. Bruno
J. Bruno
Amphos 21, Spain
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M. van Geet
M. van Geet
ONDRAF/NIRAS, Belgium
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E. Verhoef
E. Verhoef
COVRA, The Netherlands
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Geological Society of London
Volume
443
ISBN electronic:
9781786203267
Publication date:
January 01, 2017

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