P. Braun, P. Delage, S. Ghabezloo, J. Sulem, N. Conil
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Effect of anisotropy on the thermal volume changes of the Callovo–Oxfordian claystone
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.
期刊介绍:
Géotechnique Letters provides a vehicle for the rapid international dissemination of the latest and most innovative geotechnical research and practice. As an online journal, it is aimed at publishing short papers, intending to foster the quick exchange of the latest advances and most current ideas without the delays imposed by printed journals, whilst still maintaining rigorous peer reviewing standards.