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Article Dans Une Revue Géotechnique Letters Année : 2020

Effect of anisotropy on the thermal volume changes of the Callovo–Oxfordian claystone

Philipp Braun
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Pierre Delage
Siavash Ghabezloo
Jean Sulem

Résumé

An accurate monitoring of axial and radial thermal strains of a specimen of the Callovo-Oxfordian claystone, heated under constant confining stress condition close to that prevailing in the Bure Underground Research Laboratory at 490 m depth, evidenced a particular behaviour feature. The effect of the transverse isotropy of the claystone on thermal strains was confirmed, but it was also shown that the thermo-elasto-plastic overall volumetric response was mainly due to the axial response, in which some influence of the adsorbed water is suspected. Conversely, the reversible radial response observed along a temperature cycle could be modelled through a simple homogenisation method that confirmed that it was governed by the thermo-elastic expansion/contraction response of the constitutive minerals. Hence, the simultaneous occurrence of elastic thermal radial strains and elasto-plastic thermal axial strains was evidenced.
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Dates et versions

hal-02428970 , version 1 (06-01-2020)

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Citer

Philipp Braun, Pierre Delage, Siavash Ghabezloo, Jean Sulem, Nathalie Conil. Effect of anisotropy on the thermal volume changes of the Callovo–Oxfordian claystone. Géotechnique Letters, 2020, 10 (1), pp.1-4. ⟨10.1680/jgele.19.00045⟩. ⟨hal-02428970⟩
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