Evaluating hydro-mechanical interactions of adjacent clay-based sealing materials |
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| Institution: | 1. Gesellschaft für Anlagen- und Reaktorsicherheit GmbH, Theodor-Heuss-Straße 4, 38122 Braunschweig, Germany;2. Institut für Geographie und Geologie, Universität Greifswald, Friedrich-Ludwig-Jahn-Straße 17A, 17487 Greifswald, Germany;3. Institut für Angewandte Geowissenschaften, Technische Universität Darmstadt, Schnittspahnstraße 9, 64287 Darmstadt, Germany;4. VNU University of Science, Vietnam National University, Hanoi, 334 Nguyen Trai Road, Thanh Xuan District, Hanoi, Vietnam;1. University of Adelaide Discipline of Medicine, Adelaide, South Australia 5000, Australia;2. NHMRC Centre of Research Excellence in Translating Nutritional Science to Good Health, University of Adelaide, Adelaide, South Australia 5000, Australia;3. University of South Australia, School of Health Sciences, Adelaide, South Australia 5001, Australia |
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| Abstract: | Canada’s Nuclear Waste Management Organization (NWMO) is investigating various geological isolation concepts for Canada’s used reactor fuel (NWMO, 2005). These options are all based on the concept of multiple barriers that include Highly Compacted Bentonite (HCB), Dense Backfill (DBF), Light Backfill (LBF), and Gap Fill (GF). The hydraulic, mechanical, and other characteristics of these clay-based sealing materials have been examined previously, but typically in relative isolation (e.g., Dixon, 1999, Blatz, 2000, Siemens, 2006, Stroes-Gascoyne et al., 2006, Baumgartner et al., 2007). Information on how these clay-based sealing materials interact with each other is needed to understand the evolution and performance of the overall sealing system.A total of twenty-three (23) tests that examine the physical interaction of physically dissimilar clay-based sealing materials were installed and monitored at Atomic Energy of Canada Limited’s (AECL) geotechnical laboratory. This paper describes the process of water uptake, interaction between the components installed, and the role of groundwater salinity on water uptake as interpreted from these tests. |
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| Keywords: | Deep geologic disposal Clay-based sealing materials EMDD (Effective Montmorillonite Dry Density) Water uptake Deformation |
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