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Caractérisation expérimentale des propriétés de poromécaniques et de transfert de l’argilite du COx

Abstract : COx argillite has been selected as the host rock for the storage of high-activity long-live (HALL) 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 usual 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.
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https://tel.archives-ouvertes.fr/tel-01801088
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Submitted on : Tuesday, June 19, 2018 - 9:46:08 AM
Last modification on : Thursday, April 4, 2019 - 3:13:54 AM
Long-term archiving on: : Monday, September 24, 2018 - 10:59:51 PM

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  • HAL Id : tel-01801088, version 2

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Haifeng Yuan. Caractérisation expérimentale des propriétés de poromécaniques et de transfert de l’argilite du COx. Génie civil. Ecole Centrale de Lille, 2017. Français. ⟨NNT : 2017ECLI0030⟩. ⟨tel-01801088v2⟩

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