期刊名称：Journal of Earth Sciences and Geotechnical Engineering
印刷版ISSN：1792-9040
出版年度：2019
卷号：9
期号：3
页码：275-295
语种：English
出版社：Scienpress Ltd
摘要：Disposal of canisters with Highly Radioactive Waste (HLW) in boreholes incrystalline rock can be made by use of “supercontainers” with waste and clay seals,moved down in clay mud which undergoes consolidation under the swellingpressure exerted by the dense clay seals. The concept can be used for disposal inmined repositories at a few hundred meters depth and in very deep boreholes (VDH)with saline, stagnant formational waters that are unlikely to rise to contaminateshallow groundwater. For disposal in mined repositories the supercontainers aresuitably placed in 8-10m long inclined boreholes with 1,900mm diameter. Theconcept for disposal of HLW in the lower halves of 4 km deep holes relies primarilyon the sealing capacity of engineered barriers, clay and concrete, in the upper halvesof the holes. The parts of a VDH that are located in fracture-poor rock are sealedwith dense, expandable clay, and by concrete cast where pre-grouted fracture zonesare intersected. The deep holes will undergo convergence and eventually expose theclay, concrete and waste packages to radial compression. Using the Kelvinrheological model for predicting the radial convergence of the holes thesecomponents will be subject to a small pressure increase in the first 10,000 years. Ina longer time perspective, they will be compressed by the slowly increasingconfining pressure causing improved sealing ability of the clay.
