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Time-dependent behaviour of the Callovo-Oxfordian claystone-concrete interface

Abstract : In the context of the Cigéo project, the French National Radioactive Waste Management Agency (Andra) is studying the behaviour of a deep geological facility for radioactive waste deposit in the Callovo-Oxfordian (COx) claystone. The assessment of durability of this project requires the prediction of irreversible strain over a large time scale. The mechanical interaction of the host rock and the concrete support of tunnels must be investigated to ensure the long-term sustainability of the structure. The instantaneous and time-dependent behaviour of the claystone-concrete interface is experimentally investigated with direct shear tests and long-duration shear tests of a few months. The mechanical and structural state of the claystone which is affected after interaction with concrete reflects to the response of the claystone-concrete interface, and thus different types of COx claystone-concrete interfaces are tested. The delayed deformation of the interface is found to be linked to the level of the normal loading and the loading history, while a different response of the interface was observed from the short-and long-duration tests, indicating a possible progressive modification of interface under long-duration loadings.
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Contributor : Eleni Stavropoulou <>
Submitted on : Thursday, March 12, 2020 - 9:04:52 AM
Last modification on : Friday, July 3, 2020 - 4:43:31 PM
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Eleni Stavropoulou, Matthieu Briffaut, Frédéric Dufour, Guillaume Camps. Time-dependent behaviour of the Callovo-Oxfordian claystone-concrete interface. Journal of Rock Mechanics and Geotechnical Engineering, Elsevier, 2020, 12 (1), pp.89-101. ⟨10.1016/j.jrmge.2019.09.001⟩. ⟨hal-02506037⟩



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