Articles | Volume 8, issue 2
https://doi.org/10.5194/se-8-291-2017
https://doi.org/10.5194/se-8-291-2017
Research article
 | 
09 Mar 2017
Research article |  | 09 Mar 2017

Deformation in cemented mudrock (Callovo–Oxfordian Clay) by microcracking, granular flow and phyllosilicate plasticity: insights from triaxial deformation, broad ion beam polishing and scanning electron microscopy

Guillaume Desbois, Nadine Höhne, Janos L. Urai, Pierre Bésuelle, and Gioacchino Viggiani

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Cited articles

Andò, E., Hall, S. A., Viggiani, G., Desrues, J., and Besuelle, P.: Grain-scale experimental investigation of localised deformation in sand: a discrete particle tracking approach, Acta Geotechnica, 7, 1–13, 2012.
ANDRA: Evaluation of the feasibility of a geological repository in an argillaceous formation, Meuse/Haute Marne site, Dossier 2005, Argiles, Report Series, ANDRA, 2005.
Bauer-Plaindoux, C., Tessier, D., and Ghoreychi, M.: Propriétés mécaniques des roches argileuses carbonateés: importance de la relation calcite-argile, C. R. Acad. Sci. Paris, Sciences de la Terre et des planètes, Earth Planet. Sci., 326, 231–237, 1998.
Bésuelle, P. and Hall, S. A.: Characterization of the Strain Localization in a Porous Rock in Plane Strain Condition Using a New True-Triaxial Apparatus, Advances in bifurcation and degradation in geomaterials, Springer Series in geomechanics and geoengineering, 11, 345–352, 2011.
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Short summary
This work integrates measurements of the mechanical and transport properties with microstructures to understand deformation mechanisms in cemented mudrock. Cataclastic mechanisms are dominant down to nanometre scale. At low strain the fabric contains recognizable open fractures, while at high strain the reworked clay gouge shows resealing of initial fracture porosity. In the future, it will provide a microphysical basis for constitutive models to improve their extrapolation for long timescales.