Published December 20, 2017 | Version v1
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Experimental characterization of poromechanical and transport properties of COx argillite

Creators

Description

COx argillite has been selected as the host rock for the storage of high, medium-activity long-live (HA-MALL) radioactive waste in France. It will suffered the gas and water intrusion, sometimes suffered the severe thermal conditions during the sealing process. Therefore, in order to evaluate the safety of this natural barrier, it is very important to understand the poromechanical properties and transport properties of this material as well as the thermal effects. This work use gas to measure Biot's coefficient and shows that it is nearly equal to 1 in humid conditions. However, there is a gas adsorption and induced an additional swelling deformation on dry material, this effect also has a significant effect on the transport properties of the gas according to its nature. The transport and saturation properties were examined by gas technique and compared with the usually measurements. The tests also show that the permeability of in situ water is about 10-20-10-21 m2 and much lower than gas. Lastly, it is found that Biot's coefficient is not significantly affected by the thermal effect, but the relative gas permeability of argillite is significantly affected by this effect. (author)

Abstract (French)

L'argilite du COx a ete choisie comme roche hote pour le stockage des dechets radioactifs de haute activite et vie longue (HA-MAVL) en France. Ce materiau subira l'intrusion de gaz et d'eau sous, parfois, des conditions thermiques severes. Par consequent, afin d'evaluer la securite de cette barriere naturelle, il est tres important de comprendre les proprietes poromecaniques et de transfert de ce materiau ainsi que l'effet de la temperature. Ce travail aborde les mesures au gaz du coefficient de Biot et montrent que celui-ci est presque egal a 1 en conditions humides. Il y a cependant sur le materiau sec un effet de l'adsorption du gaz et une deformation supplementaire de gonflement du materiau. Cet effet a aussi un effet important sur les proprietes de transfert du gaz selon sa nature. Les proprietes de transfert et de saturation ont ete examinees par des techniques gaz et comparees aux mesures usuelles. Les essais montrent aussi que la permeabilite a l'eau de site est d'environ 10-20 - 10-21 m2 et beaucoup plus faible que celle au gaz. Enfin, on constate que le coefficient de Biot n'est pas affecte significativement par les effets thermiques mais que ces effets jouent sur la permeabilite relative au gaz de l'argilite. (auteur)

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Additional details

Additional titles

Original title (French)
Caracterisation experimentale de proprietes poromecaniques et de transfert de l'argilite du COx

Publishing Information

Imprint Pagination
132 p.
Report number
FRNC-TH--11932

INIS

Country of Publication
France
Country of Input or Organization
France
INIS RN
52093220
Subject category
S36: MATERIALS SCIENCE; S12: MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES;
Resource subtype / Literary indicator
Thesis
Descriptors DEI
ADSORPTION; ARGILLITE; DEFORMATION; DRYING; MECHANICAL PROPERTIES; MICROSTRUCTURE; PERMEABILITY; POROSITY; ROCK-FLUID INTERACTIONS; SWELLING; TEMPERATURE DEPENDENCE; TENSORS; WATER SATURATION
Descriptors DEC
DEFORMATION; PHYSICAL PROPERTIES; ROCKS; SATURATION; SEDIMENTARY ROCKS; SHALES; SORPTION

Optional Information

Notes
117 refs.; Available from the INIS Liaison Officer for France, see the INIS website for current contact and E-mail addresses