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2020 Vol.30, Issue 3 Preview Page

Technical Note

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

심층처분장 처분공 주변 굴착손상영역에 존재하는 불연속면으로의 압축 벤토나이트 침투

Changsoo Lee1*
,
Won-Jin Cho2
,
Jin-Seop Kim2
,
Geon-Young Kim2
이 창수1*
,
조 원진2
,
김 진섭2
,
김 건영2
1Senior Researcher, Korea Atomic Energy Research Institute
2Principal Researcher, Korea Atomic Energy Research Institute
1한국원자력연구원 선임연구원
2한국원자력연구원 책임연구원
* Corresponding Author
30 June 2020. pp. 193-213
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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

사용후핵연료 심층처분장 처분공에 설치된 압축 벤토나이트 완충재가 처분공 내벽에 형성된 굴착손상영역 불연속면 내로 침투하는 현상을 보다 더 현실적으로 모사할 수 있는 수학적 모델이 개발되었다. 이 모델에서는 압축 벤토나이트의 침투를 평행 평판 암반 절리을 통한 Bingham 유체의 이동으로 가정한다. 개발된 모델에 의해 벤토나이트의 침투현상을 분석한 결과, 암반 절리를 통해 압축 벤토나이트가 침투하는 최대 깊이는 포화 압축 벤토나이트의 팽윤압과 암반 절리의 폭에 비례하며, 압축 벤토나이트의 항복강도에 반비례하였다. 압축 벤토나이트의 점도는 압축 벤토나이트의 침투 속도를 좌우하나, 최대 침투깊이에는 영향을 미치지 않는다.

키워드
압축 벤토나이트
완충재
굴착손상영역
침투
최대 침투깊이
침투 속도
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Information
  • Publisher :Korean Society for Rock Mechanics and Rock Engineering
  • Publisher(Ko) :한국암반공학회
  • Journal Title :Tunnel and Underground Space
  • Journal Title(Ko) :터널과 지하공간
  • Volume : 30
  • No :3
  • Pages :193-213
  • Received Date : 2020-06-04
  • Revised Date : 2020-06-19
  • Accepted Date : 2020-06-22
  • DOI :https://doi.org/10.7474/TUS.2020.30.3.193
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