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The Thermal Volume Changes of the Callovo-Oxfordian Claystone

Abstract : There are very few data on the thermoplastic behaviour of claystones, while their knowledge is necessary in understanding long-term behaviour of high-level radioactive waste confining systems. In this paper, a number of thermomechanical parameters of the Callovo-Oxfordian claystone, the possible host rock of radioactive waste in France, are presented. These parameters were obtained from experiments performed on a hollow cylinder cell. The short drainage path of this device allows a good saturation in a reasonably short time; also, the good drainage conditions and reasonable homogeneity of pore pressure during the tests in such a low-permeability material. The saturation procedure was performed under in-site stresses prior to testing to reduce the swelling effect during hydration. The thermomechanical experimental programme conducted here evidenced a plastic contraction of the claystone during drained heating under in-situ stress conditions, like in normally consolidated soils. Previous loading induced a dilating-contracting response comparable to that of overconsolidated clays. Finally, whereas the elastic response appeared to be temperature independent, the plastic compressibility investigated through a drained isothermal isotropic compression test at 80 A degrees C increased compared to that at 25 A degrees C. These first results should be confirmed by further thermomechanical investigation on claystones.
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https://hal-enpc.archives-ouvertes.fr/hal-01003037
Contributeur : Florence Riviere <>
Soumis le : lundi 9 juin 2014 - 13:36:00
Dernière modification le : vendredi 17 juillet 2020 - 17:09:08

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Mehrdokht Mohajerani, Pierre Delage, Jean Sulem, Mohammad Monfared, Anh Minh Tang, et al.. The Thermal Volume Changes of the Callovo-Oxfordian Claystone. Rock Mechanics and Rock Engineering, Springer Verlag, 2014, 47 (1), pp.131-142. ⟨10.1007/s00603-013-0369-8⟩. ⟨hal-01003037⟩

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