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Poroelastic Investigation of the Callovo-Oxfordian Claystone
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 m2), 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.
Poroelastic Investigation of the Callovo-Oxfordian Claystone
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 m2), 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.
Poroelastic Investigation of the Callovo-Oxfordian Claystone
Belmokhtar, M. (author) / Delage, P. (author) / Ghabezloo, S. (author) / Conil, N. (author)
Sixth Biot Conference on Poromechanics ; 2017 ; Paris, France
Poromechanics VI ; 830-838
2017-07-06
Conference paper
Electronic Resource
English
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