Measurement of thermally-induced pore-water pressure increase and gas migration in the Opalinus Clay at Mont Terri

Kull, H.; Jockwer, Norbert; Zhang, Chunliang; Wileveau, Y.; Pepa, S.

doi:10.1016/j.pce.2006.04.036

Cited by 14 publications

(2 citation statements)

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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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Section: Introductionmentioning

confidence: 99%

A Laboratory Investigation on Thermal Properties of the Opalinus Claystone

et al. 2011

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“…As a result of this compaction, the strength of the clay and the pre-consolidation pressure in the clay increased irreversibly. From heater test results in Opalinus clay, it was concluded that neither the heating nor the subsequent cooling caused thermally induced cracks in the clay (Kull et al, 2007;Zhang et al, 2007).…”

Section: Fig 1 Temperature At the Expansion-contraction-threshold Amentioning

confidence: 99%

Evaluation of temperature-induced effects on safety-relevant properties of clay host rocks with regard to HLW/SF disposal

Jobmann

Meleshyn

2015

Mineral. mag.

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DBE TECHNOLOGY, BGR and GRS are developing a methodology to demonstrate the safety of a repository for high-level waste and spent fuel (HLW/SF) in clays according to the requirements of the German regulating body. In particular, these requirements prescribe that the barrier effect of host rocks must not be compromised by a thermal impact resulting from HLW/SF emplacement. To substantiate and quantify this requirement, we carried out a literature survey of research on thermally-induced changes on clay properties. Effects thus compiled can be divided into thermo-hydro-mechanical and chemical-biologicalmineralogical effects and were analysed with regard to their relevance to the integrity of clay host rocks. This analysis identified one effect of major influence within each group: thermal expansion and compaction as well as results of microbial activities. Importantly, it further revealed that a moderate temperature increase above 100°C cannot be expected to compromise the integrity of the geological barrier according to the current knowledge state. Evidence is presented in this paper that temperature increases up to 150°C can actually contribute to an improved performance of a radioactive waste repository by increasing the consolidation of the clay and sterilizing the repository's near-field to depress the deteriorative microbial effects. A quantitative temperature criterion for thermal impact of HLW/SF on clay host rocks is accordingly proposed.

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Creep Effects on the Thermo-Hydro-Mechanical Responses of Callovo-Oxfordian Claystone

Souley

Alonso

et al. 2021

Lecture Notes in Civil Engineering

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Measurement of thermally-induced pore-water pressure increase and gas migration in the Opalinus Clay at Mont Terri

Cited by 14 publications

References 1 publication

A Laboratory Investigation on Thermal Properties of the Opalinus Claystone

A Laboratory Investigation on Thermal Properties of the Opalinus Claystone

Evaluation of temperature-induced effects on safety-relevant properties of clay host rocks with regard to HLW/SF disposal

Creep Effects on the Thermo-Hydro-Mechanical Responses of Callovo-Oxfordian Claystone

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