Dielectric relaxation behavior of Callovo-Oxfordian clay rock: A hydraulic-mechanical-electromagnetic coupling approach

Wagner, Norman, Bore, Thierry, Robinet, Jean-Charles, Coelho, Daniel, Taillade, Frederic and Delepine-Lesoille, Sylvie (2013) Dielectric relaxation behavior of Callovo-Oxfordian clay rock: A hydraulic-mechanical-electromagnetic coupling approach. Journal of Geophysical Research, 118 9: 4729-4744. doi:10.1002/jgrb.50343


Author Wagner, Norman
Bore, Thierry
Robinet, Jean-Charles
Coelho, Daniel
Taillade, Frederic
Delepine-Lesoille, Sylvie
Title Dielectric relaxation behavior of Callovo-Oxfordian clay rock: A hydraulic-mechanical-electromagnetic coupling approach
Journal name Journal of Geophysical Research   Check publisher's open access policy
ISSN 0148-0227
2156-2202
Publication date 2013-01-01
Year available 2013
Sub-type Article (original research)
DOI 10.1002/jgrb.50343
Open Access Status DOI
Volume 118
Issue 9
Start page 4729
End page 4744
Total pages 16
Place of publication Hoboken, NJ United States
Publisher Wiley-Blackwell Publishing
Language eng
Abstract 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. Key Points Dielectric relaxation behavior of porous mediaRadio and microwave remote sensing techniquesHydraulic-mechanical-electromagnetic coupling
Keyword Clay rock
Dielectric relaxation spectroscopy
High frequency electromagnetic techniques
Hydraulic mechanical electromagnetic coupling
Water retention characteristics
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Civil Engineering Publications
 
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Created: Fri, 21 Aug 2015, 07:30:29 EST by Jeannette Watson on behalf of School of Civil Engineering