Hydromechanical Behaviour of Rock-Bentonite Interfaces Under Compression |
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| Authors: | O Buzzi M Boulon F Deleruyelle F Besnus |
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| Institution: | 1.Laboratoire Sols, Solides, Structures,Université Joseph Fourier,Grenoble,France;2.Institut de Radioprotection et S?reté Nucléaire,Fontenay aux roses,France |
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| Abstract: | Summary Interfaces between geomaterials may be critical for the long term confinement of the engineered barriers of nuclear waste
disposals, particularly if there is water flow. Hydromechanical compression tests have been performed on rock-bentonite interfaces
representing the contact between a host rock (toarcian argillite) and an engineered barrier within a nuclear waste repository.
The results show that there is no major influence of the bentonite fraction or the nature of the additive as long as the additive
is inert (sand or crushed rock): all the interfaces are closed for low values of normal stress (about 4 MPa). On the other
hand, the hydromechanical behaviour of the interfaces changes when a high fraction of cement is used. Moreover, it has been
shown that bentonite is very sensitive to hydraulic erosion, producing flow channels within the interface zone. A numerical
study confirms the importance of erosion for the hydromechanical behaviour of the interface.
Authors’ address: Olivier Buzzi, Laboratoire Sols, Solides, Structures, Université Joseph Fourier, BP 53, 38041 Grenoble,
Cedex 9, France |
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| Keywords: | : Bentonite rock interface hydromechanical erosion engineered barrier |
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