Dielectric relaxation behavior of Callovo-Oxfordian clay rock; a hydraulic-mechanical-electromagnetic coupling approach

Titre Dielectric relaxation behavior of Callovo-Oxfordian clay rock; a hydraulic-mechanical-electromagnetic coupling approach
Titre court Dielectric relaxation behavior of Callovo-Oxfordian clay rock; a hydraulic-mechanical-electromagnetic coupling approach
Type de document article
Auteur(s) Wagner, N.
Bore, T.
Robinet, J.-C.
Coehlo, D.
Taillade, F.
Delepine-Lesoille, S.
Date 2013
Titre de la publication Journal of Geophysical Research: Solid Earth
Volume vol. 118
9
N° de page(s) 4729-4744
Résumé Water content is a key parameter to monitor in nuclear waste repositories such as the planed underground repository in Bure, France, in the Callovo-Oxfordian (COx) clay formation. High-frequency electromagnetic (HF-EM) measurement techniques, i.e., time or frequency domain reflectometry, offer useful tools for quantitative estimation of water content in porous media. However, despite the efficiency of HF-EM methods, the relationship between water content and dielectric material properties needs to be characterized. Moreover, the high amount of swelling clay in the COx clay leads to dielectric relaxation effects which induce strong dispersion coupled with high absorption of EM waves. Against this background, the dielectric relaxation behavior of the clay rock was studied at frequencies from 1 MHz to 10 GHz with network analyzer technique in combination with coaxial transmission line cells. For this purpose, undisturbed and disturbed clay rock samples were conditioned to achieve a water saturation range from 0.16 to nearly saturation. The relaxation behavior was quantified based on a generalized fractional relaxation model under consideration of an apparent direct current conductivity assuming three relaxation processes: a high-frequency water process and two interface processes which are related to interactions between the aqueous pore solution and mineral particles (adsorbed/hydrated water relaxation, counter ion relaxation and Maxwell-Wagner effects). The frequency-dependent HF-EM properties were further modeled based on a novel hydraulic-mechanical-electromagnetic coupling approach developed for soils. The results show the potential of HF-EM techniques for quantitative monitoring of the hydraulic state in underground repositories in clay formations.
ISSN 2169-9313
DOI 10.1002/jgrb.50343
Langue Anglais
Collection Notre bibliothèque
Wagner, N. et al., 2013. Dielectric relaxation behavior of Callovo-Oxfordian clay rock; a hydraulic-mechanical-electromagnetic coupling approach. Journal of Geophysical Research: Solid Earth. vol. 118 n° 9. p. 4729-4744. ISSN : 2169-9313.

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