IWBDG 2017: Bifurcation and Degradation of Geomaterials with Engineering Applications pp 11-17 | Cite as
Water Saturation Induced Strength Degradation of Callovo-Oxfordian Claystone
Abstract
It is necessary to investigate the effect of initial water content on the strength behaviors of the Callovo-Oxfordian (COx) argillite since the construction activities of underground radioactive waste repositories can induce a desaturation and a resaturation process of the hosted rock. The present work is devoted to an experimental characterization of the water induced strength degradation the COx argillite under constant strain rate loadings. Argillite samples of initial relative humidity (RH) of 98% are firstly tested at confining pressure of 4 MPa, 8 MPa and 12.4 MPa to derive a strength criterion. Then another group of tests on argillite samples with different saturation realized by relative humidity (dry, 76 and 85%) are carried out to quantify the water content induced strength degradation in claystone. It is found that both the peak and residual stress and the failure strain are correlated with the humidity level of the claystone. The results give the implications that the desaturation and re-saturation of argillite will exert influences on its surroundings in the underground repositories. Special attention should be paid to minimize the swelling effect of clay minerals and oxidation of pyrite inclusions in the argillite with water presence.
Keywords
Argillite Damage Failure Water degradation Radioactive waste disposalReferences
- 1.Andra (2012) Recherche et développement à l’Andra pour les projets de stockage. Andra, ParisGoogle Scholar
- 2.Yang, D., Chanchole, S., Valli, P., Chen, L.: Study of the anisotropic properties of argillite under moisture and mechanical loads. Rock Mech. Rock Eng. 46(2), 247–257 (2013)CrossRefGoogle Scholar
- 3.Zhang, F., Xie, S.Y., Hu, D.W., Shao, J.F., Gatmiri, B.: Effect of water content and structural anisotropy on mechanical property of claystone. Appl. Clay Sci. 69, 79–86 (2012)CrossRefGoogle Scholar
- 4.Bemer, E., Longuemare, P., Vincké, O.: Poroelastic parameters of Meuse/Haute Marne argillites: effect of loading and saturation states. Appl. Clay Sci. 26(1–4), 359–366 (2004)CrossRefGoogle Scholar
- 5.Hu, D.W., Zhang, F., Shao, J.F., Gatmiri, B.: Influences of mineralogy and water content on the mechanical properties of argillite. Rock Mech. Rock Eng. 47(1), 157–166 (2013)CrossRefGoogle Scholar
- 6.Zhang, F., Hu, D.W., Xie, S.Y., Shao, J.F.: Influences of temperature and water content on mechanical property of argillite. Eur J Environ Civ En 18(2), 173–189 (2013)CrossRefGoogle Scholar
- 7.Bornert, M., Valès, F., Gharbi, H., Nguyen Minh, D.: Multiscale full-field strain measurements for micromechanical investigations of the hydromechanical behaviour of clayey rocks. Strain 46(1), 33–46 (2010)CrossRefGoogle Scholar
- 8.Robinet, J.-C.: Minéralogie, porosité et diffusion des solutés dans l’argilite du Callovo-Oxfordien de Bure (Meuse, Haute-Marne, France) de l’échelle centimétrique à micrométrique. Université de Poitiers, Poitiers (2008)Google Scholar
- 9.Liu, Z.B., Shao, J.F.: Moisture effects on damage and failure of Bure claystone under compression. Geotechnique Letters 6(3), 182–186 (2016)CrossRefGoogle Scholar
- 10.Andra (2005) Dossier 2005: CDROM Argile—plaquettes, synthèse, tomes, référentiels et glossaireGoogle Scholar
- 11.Liu, Z., Xie, S., Shao, J., Conil, N.: Effects of deviatoric stress and structural anisotropy on compressive creep behavior of a clayey rock. Appl. Clay Sci. 114, 491–496 (2015)CrossRefGoogle Scholar
- 12.Liu, Z., Shao, J., Xie, S., Secq, J.: Gas permeability evolution of clayey rocks in process of compressive creep test. Mater. Lett. 139, 422–425 (2015)CrossRefGoogle Scholar