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Micro-scale experimental investigation of the swelling anisotropy of the Callovo-Oxfordian argillaceous rock

Published online by Cambridge University Press:  09 July 2018

L. L. Wang ,
M. Bornert ,
S. Chanchole ,
D. S. Yang ,
E. Héripre ,
A. Tanguy  and
D. Caldemaison
L. L. Wang*
Affiliation:
Laboratoire de Mécanique des Solides (UMR 7649), École Polytechnique, 91128 Palaiseau Cedex, France
M. Bornert
Affiliation:
Laboratoire Navier (UMR 8205), CNRS, ENPC, IFSTTAR, Université Paris-Est, 77455 Marne-la-Vallée Cedex, France
S. Chanchole
Affiliation:
Laboratoire de Mécanique des Solides (UMR 7649), École Polytechnique, 91128 Palaiseau Cedex, France
D. S. Yang
Affiliation:
State Laboratory of Geomechanics and Geotechnical Engineering, IRSM, Chinese Academy of Science, 430071 Wuhan, China
E. Héripre
Affiliation:
Laboratoire de Mécanique des Solides (UMR 7649), École Polytechnique, 91128 Palaiseau Cedex, France
A. Tanguy
Affiliation:
Laboratoire de Mécanique des Solides (UMR 7649), École Polytechnique, 91128 Palaiseau Cedex, France
D. Caldemaison
Affiliation:
Laboratoire de Mécanique des Solides (UMR 7649), École Polytechnique, 91128 Palaiseau Cedex, France
*
*E-mail: [email protected]
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Abstract

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An experimental study of the swelling anisotropy of the Callovo-Oxfordian argillaceous rock under hydration is presented. The investigation, which combines environmental scanning electron microscopy (ESEM) and digital image correlation techniques, has been carried out at the micrometric scale of the composite microstructure of the rock. Specimens were hydrated in the ESEM over a wide range of relative humidity and observations conducted on two planes: plane 1 parallel to the bedding plane, and plane 2 perpendicular to it. The observations reveal that the local swelling (which can be quantified at a local gauge length of about 5 μm) is strongly anisotropic in both planes. The global swelling, measured over areas of about 500 μm in width, is also clearly anisotropic in plane 2 (with major swelling direction normal to the bedding plane), but not in plane 1. The global isotropy in plane 1 arises from the uniform distribution of the orientation of anisotropic local strains, while the anisotropic swelling in plane 2 is due to a preferred local orientation.

Keywords

argillaceous rocksradioactive waste repositoryanisotropic swellingenvironmental scanning electron microscopydigital image correlationlocal strain fieldgeomechanics
Type
Research Article
Information
Clay Minerals , Volume 48 , Issue 2 , May 2013 , pp. 391 - 402
Creative Commons
Creative Common License - CCCreative Common License - BY
Copyright © The Mineralogical Society of Great Britain and Ireland 2013 This is an Open Access article, distributed under the terms of the Creative Commons Attribution license. (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2013

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