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http://dx.doi.org/10.7474/TUS.2020.30.3.193

Penetration of Compacted Bentonite into the Discontinuity in the Excavation Damaged Zone of Deposition Hole in the Geological Repository  

Lee, Changsoo (Korea Atomic Energy Research Institute)
Cho, Won-Jin (Korea Atomic Energy Research Institute)
Kim, Jin-Seop (Korea Atomic Energy Research Institute)
Kim, Geon-Young (Korea Atomic Energy Research Institute)
Publication Information
Tunnel and Underground Space / v.30, no.3, 2020 , pp. 193-213 More about this Journal
Abstract
A mathematical model to simulate more realistically the penetration of compacted bentonite buffer installed in the deposition hole into the discontinuity in the excavation damaged zone formed at the inner wall of the deposition hole in the geological repository for spent fuel is developed. In this model, the penetration of compacted bentonite is assumed to be the flow of Bingham fluid through the parallel planar rock fracture. The penetration of compacted bentonite is analyzed using the developed model. The results show that the maximum penetration depth of compacted bentonite into the rock fracture is proportioned to the swelling pressure of saturated compacted bentonite and the aperture of rock fracture. However, it is in inverse proportion to the yield strength of compacted bentonite. The viscosity of compacted bentonite dominates the penetration rate of compacted bentonite, but has no influence to the maximum penetration depth.
Keywords
Compacted Bentonite; Buffer; Excavation Damaged Zone; Penetration; Maximum Penetration Depth; Penetration Rate;
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Times Cited By KSCI : 2  (Citation Analysis)
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