Characterization of drying-induced deformation behaviour of Opalinus Clay and tuff in no-stress regime |
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| Authors: | Aung Ko Ko Soe Masahiko Osada Manabu Takahashi Tai Sasaki |
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| Institution: | (1) Graduate School of Science and Engineering, Saitama University, 255 Shimo Okubo, Sakuraku, Saitama Shi Saitama, 338-8570, Japan;(2) Geosphere Research Institute, Saitama University, 255 ShimoOkubo, Sakuraku, Saitama Shi Saitama, 338-8570, Japan;(3) National Institute of Advanced Industrial Science and Technology (AIST), Central 7, Higashi 1-1-1, Tsukuba Ibaraki, 305-8567, Japan;(4) Japan Nuclear Fuel Limited, 504-22 Rokkasho Mamikita, Aomori 039-3212, Japan |
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| Abstract: | The drying-induced deformation behaviour of Opalinus Clay and tuff, which are being investigated under international and local
collaborative projects for nuclear waste disposal in Switzerland and Japan, was investigated under a no-stress condition in
the laboratory to evaluate their generic susceptibility to the formation of excavation damaged zone. The cylindrical core
samples of Opalinus Clay and tuff were prepared to a one-dimensional drying condition and submitted to an uncontrolled laboratory
environment. The strain evolution, evaporative water loss and environmental entities, such as temperature and relative humidity,
were recorded simultaneously and quasi-continuously. It was observed that the drying phase induced significant strain magnitude
and damage in Opalinus Clay samples, which was evidenced by the formation of hairy cracks on the surface parallel to the bedding.
On the contrary, the strain occurrences in tuff samples were relatively insignificant, and no tendency of cracking was observed.
In addition, the quasi-continuous availability of volumetric strains was further used in poroelastic relation for the estimation
of capillary suction evolution. The calculated results were validated with pore size distributions obtained from mercury intrusion
porosimetry. |
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| Keywords: | Drying-induced deformation Opalinus Clay Tuff Volumetric strain Capillary suction Pore size |
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