Determination of the thermal conductivity of opalinus clay via simulations of experiments performed at the Mont Terri underground laboratory

Mügler, Claude; Filippi, Michal; Montarnal, Philippe; Martínez, Javier Martínez; Wileveau, Y.

doi:10.1016/j.jappgeo.2005.05.002

Cited by 20 publications

(8 citation statements)

References 7 publications

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“…Despite these similarities in the diagenesis, the petrofabrics and the geologic history of the two rocks are quite different and are expressed by differences in the effective properties. In particular, a more pronounced anisotropy of thermal conductivity is reported for Opalinus Clay , whereas the anisotropy coefficient (the ratio of maximal to minimal value) of the thermal conductivity of the Callovo‐Oxfordian argillite is small and generally inferior to 1.24 . Other data on the thermal properties of these rocks can be found in already published works from laboratory and in situ measurements .…”

Section: Effective Thermal Properties Of Two Partially Saturated Poromentioning

confidence: 90%

“…Published works on these rocks (see for example , among others) indicate complex structures at mesoscopic and microscopic level with a clay matrix surrounding pores and mineral inclusions, mainly quartz and calcite grains. For the Callovo‐Oxfordian argillite, for example, the volume fraction of these mineral inclusions varies from 30 % to 60 % as a function of the depth, whereas the total porosity can vary from 10 % to 18 % with the connected porosity being even lower.…”

Section: Effective Thermal Properties Of Two Partially Saturated Poromentioning

confidence: 97%

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Effective transfer properties of partially saturated geomaterials with interfaces using the immersed interface method

Hoxha

2013

Num Anal Meth Geomechanics

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International audienceThe present work aims at introducing an efficient numerical approach based on the immersed interface method to estimate the effective thermal conductivity and permeability of geomaterials as porous media with either perfect or debonded interfaces. The first part deals with the problem of the overall thermal properties of a medium containing perfectly bonded inclusions. The evolution of the homogenized properties with respect to the properties of individual constituents, the volume fraction, the spatial distribution, and the shape of inclusions is highlighted. The second part of the paper is devoted to the case of imperfectly bonded inclusions. An extension of the immersed interface method in this context makes it possible to study other aspects that have an influence on the effective properties such as the interfacial resistance and the size of inclusions. The application of the proposed numerical tool to some porous rocks in partially saturated condition shows good agreement with the available experimental results and demonstrates the performance and the flexibility of the developed procedur

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Section: Effective Thermal Properties Of Two Partially Saturated Poromentioning

confidence: 90%

Section: Effective Thermal Properties Of Two Partially Saturated Poromentioning

confidence: 97%

Effective transfer properties of partially saturated geomaterials with interfaces using the immersed interface method

Hoxha

2013

Num Anal Meth Geomechanics

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“…In London clay, the thermal conductivity in the direction perpendicular to the bedding plane was found equal to 0.83 W/(m·K) whereas that in the direction parallel to the bedding plane was equal to 1.19 W/(m·K) (Midttømme and Roaldset, 1999). The thermal conductivity of Opalinus Clay was investigated by Mügler et al (2006). They reported that the values obtained by in-situ back analysis are 0.55-1.07 W/(m·K) in the direction perpendicular to bedding and 1.84-1.90 W/(m·K) in the direction parallel to bedding, respectively.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic thermal conductivity of natural Boom Clay

Dao

Delage

Tang

et al. 2014

Applied Clay Science

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The thermal conductivity of host rocks is an important parameter in the design of deep geological disposal of heat-emitting radioactive waste. Due to bedding, heat transfer in sedimentary rocks is affected by their transversally isotropic structure. In this work, an experimental program is run to measure the thermal conductivities of Boom Clay along various orientations with respect to the bedding plane by using the needle thermal probe technique. Measurements were performed on specimens obtained from cores drilled from the HADES Underground Research Laboratory (URL) at Mol, Belgium, at a depth of 223 m. The thermal conductivity values obtained are in good agreement with those previously published, confirming the thermal anisotropy of Boom Clay. Moreover, the observed changes in thermal conductivity with respect to the distance to the gallery provide further evidence on the extent of the Excavation Damaged Zone around the gallery.

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“…Therefore, the coupling between thermal phenomena and the response of the claystone must be further investigated. In situ investigations have been performed on the thermal properties of the Opalinus claystone in the Mont-Terri Underground Research Laboratory, (Hohner and Bossart 1998;Mügler et al 2006;Jobmann and Polster 2007;Kull et al 2007;Gens et al 2007). Most of laboratory works on the thermal response of Opalinus claystone have been performed in unsaturated condition (Jobmann and Polster 2007;Zhang et al 2007).…”

Section: Introductionmentioning

confidence: 99%

A Laboratory Investigation on Thermal Properties of the Opalinus Claystone

et al. 2011

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Some aspects of the thermal behavior of the Opalinus claystone are investigated through laboratory tests conducted on a new hollow cylinder triaxial apparatus specially designed for studying the thermo-hydromechanical behavior of very low permeable materials. Two hollow cylinder samples are first resaturated under isotropic stress state equal to the mean effective in situ one in order to minimize swelling and induced damage during the resaturation phase. Two drained heating-cooling cycles are performed on the first sample of Opalinus claystone. During the first cycle, a thermo-elasto-plastic response similar to that of plastic clays with low overconsolidation ratio is obtained. The thermal hardening of the sample is demonstrated by the quasi-reversible behavior of the sample during the second heating-cooling cycle. An undrained heating test performed on the second sample of Opalinus claystone induces an excess pore pressure in this sample. This induced pore pressure is attributed to the higher thermal expansion coefficient of pore water compared to that of the solid phase. It is shown that the excess pore pressure generated in the sample by undrained heating cannot be modeled by considering the free water thermal expansion coefficient. The thermal expansion coefficient of the Opalinus claystone water is back-analyzed from the experimental results which show a higher value than free water.

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Determination of the thermal conductivity of opalinus clay via simulations of experiments performed at the Mont Terri underground laboratory

Cited by 20 publications

References 7 publications

Effective transfer properties of partially saturated geomaterials with interfaces using the immersed interface method

Effective transfer properties of partially saturated geomaterials with interfaces using the immersed interface method

Anisotropic thermal conductivity of natural Boom Clay

A Laboratory Investigation on Thermal Properties of the Opalinus Claystone

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