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Thermal Behaviour and Creep of the Callovo-Oxfordian Claystone
The Callovo-Oxfordian (COx) claystone is considered as a possible host rock for radioactive waste disposal in France (Andra). Temperature elevation, expected to reach 100°C, will affect the rock. Thermal volumetric response of the COx claystone is studied in this work by using a thermal isotropic compression cell. Full saturation of the sample and fully drained conditions during heating are carefully achieved thanks to the short drainage length (10 mm). A drained heating test under constant stress carried out up to 80°C exhibited a thermo-elastic expansion followed by thermo-plastic contraction. The transition appeared at a temperature of 48°C, close to the maximum burial temperature supported during the geological history of the material, estimated at 50°C. A volumetric creep enhanced by temperature is observed under in-situ stress conditions. Creep volume changes were modelled by using a Kelvin-Voigt viscoelastic model, so as to correct the measured strains and evaluate the thermal expansion coefficients.
Thermal Behaviour and Creep of the Callovo-Oxfordian Claystone
The Callovo-Oxfordian (COx) claystone is considered as a possible host rock for radioactive waste disposal in France (Andra). Temperature elevation, expected to reach 100°C, will affect the rock. Thermal volumetric response of the COx claystone is studied in this work by using a thermal isotropic compression cell. Full saturation of the sample and fully drained conditions during heating are carefully achieved thanks to the short drainage length (10 mm). A drained heating test under constant stress carried out up to 80°C exhibited a thermo-elastic expansion followed by thermo-plastic contraction. The transition appeared at a temperature of 48°C, close to the maximum burial temperature supported during the geological history of the material, estimated at 50°C. A volumetric creep enhanced by temperature is observed under in-situ stress conditions. Creep volume changes were modelled by using a Kelvin-Voigt viscoelastic model, so as to correct the measured strains and evaluate the thermal expansion coefficients.
Thermal Behaviour and Creep of the Callovo-Oxfordian Claystone
Belmokhtar, Malik (author) / Delage, Pierre (author) / Ghabezloo, Siavash (author) / Conil, Nathalie (author)
Sixth Biot Conference on Poromechanics ; 2017 ; Paris, France
Poromechanics VI ; 839-846
2017-07-06
Conference paper
Electronic Resource
English
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