Effect of a partial saturation on the hydromechanical response of a clay rock
Abstract
The behaviour of claystones and shales ispresently investigated in details in link with their potential use as host rock for radioactive waste disposal at great depth. Claystones are very sensitive to changes in water content, with an increase of their mechanical properties with desaturation under increased suction. Claystones have standard water retention properties but some effect of hydric damage is observed after a drying-wetting cycle that results in enhanced swelling. The microstructure of the Callovo-Oxfordian claystone tested here is characterized by a clay matrix (50% clay fraction) made up of clay platelets that can be assimilated to bricks. The pore size distribution is well organized around a mean diameter of 32nm that provides an idea of the mean thickness of the platelets. A stress release at constant water content results in a swelling and desaturation due to an internal transfer from free inter-platelets water to linked intra-platelets water.References
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Wan, M., P. Delage, A. M. Tang & J. Talandier (2013) Water retention properties of the Callovo-Oxfordian claystone. International Journal of Rock Mechanics and Mining Sciences 64: 96-104.
Yven, B., S. Sammartino, Y. Géroud, F. Homand & F. Villiéras (2007) Mineralogy, texture and porosity of Callovo-Oxfordian claystones of the Meuse/Haute-Marne region (eastern Paris Basin). Mémoires de la Société géologique de France 178 : 73-90.
De La Vaissière, R. & J. Talandier (2012) Gas injection tests in the Meuse/Haute Marne underground research laboratory. Proc. Transfert Conf., Ecole Centrale de Lille, 360–368.
Delage, P., H. Menaceur, A.M. Tang & J. Talandier (2014) Suction effects in deep Callovo-Oxfordian claystone. Géotechnique Letters 4 : 267-271.
Menaceur, H. (2014) Comportement thermo-hydro-mécanique et microstructure de l'argilite du Callovo-Oxfordien. Thèse de doctorat, Ecole des ponts ParisTech, Université Paris-Est.
Pham, Q. T., F. Vales, L. Malinsky, D. Nguyen Minh & H. Gharbi (2007) Effects of desaturation–resaturation on mudstone. Physics and Chemistry of the Earth, Parts A/B/C, 32(8-14): 646-655.
Wan, M., P. Delage, A. M. Tang & J. Talandier (2013) Water retention properties of the Callovo-Oxfordian claystone. International Journal of Rock Mechanics and Mining Sciences 64: 96-104.
Yven, B., S. Sammartino, Y. Géroud, F. Homand & F. Villiéras (2007) Mineralogy, texture and porosity of Callovo-Oxfordian claystones of the Meuse/Haute-Marne region (eastern Paris Basin). Mémoires de la Société géologique de France 178 : 73-90.
Published
2016-03-24
How to Cite
DELAGE, Pierre et al.
Effect of a partial saturation on the hydromechanical response of a clay rock.
Journal of Applied Engineering Science & Technology, [S.l.], v. 2, n. 1, p. 9-13, mar. 2016.
ISSN 2571-9815.
Available at: <http://univ-biskra.dz/revues/index.php/jaest/article/view/1507>. Date accessed: 27 dec. 2024.
Issue
Section
Section C: Geotechnical and Civil Engineering
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