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Time-Dependent Physical Interaction of Clay and Rock in HLW Repositories
Dept. of Civil and Architectural Engineering, East China University of Technology, China.
Dept. of Production and Materials Engineering, Lund University, Sweden.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-6851-4839
2019 (English)In: Journal of Earth Sciences and Geotechnical Engineering, ISSN 1792-9040, E-ISSN 1792-9660, Vol. 9, no 3, p. 273-293Article in journal (Refereed) Published
Abstract [en]

Disposal of canisters with Highly Radioactive Waste (HLW) in boreholes in crystalline rock can be made by use of “supercontainers” with waste and clay seals, moved down in clay mud which undergoes consolidation under the swelling pressure exerted by the dense clay seals. The concept can be used for disposal in mined repositories at a few hundred meters depth and in very deep boreholes (VDH) with saline, stagnant formational waters that are unlikely to rise to contaminate shallow groundwater. For disposal in mined repositories the supercontainers are suitably placed in 8-10m long inclined boreholes with 1,900mm diameter. The concept for disposal of HLW in the lower halves of 4 km deep holes relies primarily on the sealing capacity of engineered barriers, clay and concrete, in the upper halves of the holes. The parts of a VDH that are located in fracture-poor rock are sealed with dense, expandable clay, and by concrete cast where pre-grouted fracture zones are intersected. The deep holes will undergo convergence and eventually expose the clay, concrete and waste packages to radial compression. Using the Kelvin rheological model for predicting the radial convergence of the holes these components will be subject to a small pressure increase in the first 10,000 years. In a longer time perspective, they will be compressed by the slowly increasing confining pressure causing improved sealing ability of the clay.

Place, publisher, year, edition, pages
Uk: Scientific Press International Limited , 2019. Vol. 9, no 3, p. 273-293
Keywords [en]
Highly Radioactive Waste (HLW), boreholes, crystalline rock, clay seali, disposal, deep hole concept (VDH), supercontainer
National Category
Engineering and Technology Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-75713OAI: oai:DiVA.org:ltu-75713DiVA, id: diva2:1346248
Note

Validerad;2019;Nivå 1;2019-09-02 (johcin)

Available from: 2019-08-27 Created: 2019-08-27 Last updated: 2019-09-02Bibliographically approved

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Pusch, Roland

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