TY - GEN
T1 - Thermal Behaviour and Creep of the Callovo-Oxfordian Claystone
AU - Belmokhtar, Malik
AU - Delage, Pierre
AU - Ghabezloo, Siavash
AU - Conil, Nathalie
N1 - Publisher Copyright:
© ASCE.
PY - 2017/1/1
Y1 - 2017/1/1
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/85026304391
U2 - 10.1061/9780784480779.104
DO - 10.1061/9780784480779.104
M3 - Conference contribution
AN - SCOPUS:85026304391
T3 - Poromechanics 2017 - Proceedings of the 6th Biot Conference on Poromechanics
SP - 839
EP - 846
BT - Poromechanics 2017 - Proceedings of the 6th Biot Conference on Poromechanics
A2 - Dangla, Patrick
A2 - Pereira, Jean-Michel
A2 - Ghabezloo, Siavash
A2 - Vandamme, Matthieu
PB - American Society of Civil Engineers (ASCE)
T2 - 6th Biot Conference on Poromechanics, Poromechanics 2017
Y2 - 9 July 2017 through 13 July 2017
ER -