TY - GEN
T1 - Poroelastic Investigation of the Callovo-Oxfordian Claystone
AU - Belmokhtar, M.
AU - Delage, P.
AU - Ghabezloo, S.
AU - Conil, N.
N1 - Publisher Copyright:
© ASCE.
PY - 2017/1/1
Y1 - 2017/1/1
N2 - A careful determination of the poroelastic parameters of the Callovo-Oxfordian (COx) claystone, a potential host rock for the deep underground repository of radioactive waste in France, was conducted in an isotropic compression cell. Fully saturated specimens were tested by carrying out drained, undrained and unjacketed compression tests. Due to the low permeability (10-20 m), small loading rates were used to ensure full drainage conditions in drained and pore pressure tests (0.5 kPa/min) and in the unjacketed test (2 kPa/min). Strains were precisely measured by ensuring direct contact between the LVDTs' stems and the specimen. A transverse isotropic poroelasticity analysis provided the anisotropic Biot's effective stress coefficients b1 (perpendicular to bedding) and b2 (parallel to bedding) with b1 between 0.85 and 0.87 and b2 between 0.90 and 0.98. An unjacketed modulus Ks = 21.7 GPa was also determined directly and by an indirect evaluation. A set of equivalent isotropic poroelastic parameters was derived and a good compatibility between the results of different tests was found.
AB - A careful determination of the poroelastic parameters of the Callovo-Oxfordian (COx) claystone, a potential host rock for the deep underground repository of radioactive waste in France, was conducted in an isotropic compression cell. Fully saturated specimens were tested by carrying out drained, undrained and unjacketed compression tests. Due to the low permeability (10-20 m), small loading rates were used to ensure full drainage conditions in drained and pore pressure tests (0.5 kPa/min) and in the unjacketed test (2 kPa/min). Strains were precisely measured by ensuring direct contact between the LVDTs' stems and the specimen. A transverse isotropic poroelasticity analysis provided the anisotropic Biot's effective stress coefficients b1 (perpendicular to bedding) and b2 (parallel to bedding) with b1 between 0.85 and 0.87 and b2 between 0.90 and 0.98. An unjacketed modulus Ks = 21.7 GPa was also determined directly and by an indirect evaluation. A set of equivalent isotropic poroelastic parameters was derived and a good compatibility between the results of different tests was found.
UR - https://www.scopus.com/pages/publications/85026286723
U2 - 10.1061/9780784480779.103
DO - 10.1061/9780784480779.103
M3 - Conference contribution
AN - SCOPUS:85026286723
T3 - Poromechanics 2017 - Proceedings of the 6th Biot Conference on Poromechanics
SP - 830
EP - 838
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 -