터널과지하공간 (Tunnel and Underground Space)

  • 제29권6호
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  • Pages.439-455
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  • 2019
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  • 1225-1275(pISSN)
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  • 2287-1748(eISSN)
한국암반공학회 (Korean Society for Rock Mechanics and Rock Engineering)
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심층 처분 시설의 수리 역학적 해석을 통한 벤토나이트 버퍼의 역학적 영향 인자 중요도 평가

A Coupled Hydro-Mechanical Analysis of a Deep Geological Repository to Assess Importance of Mechanical Factors of Bentonite Buffer

  • 전윤수 (한국과학기술원 건설및환경공학과) ;
  • 이승래 (한국과학기술원 건설및환경공학과) ;
  • 김민섭 (한국과학기술원 건설및환경공학과) ;
  • 전준서 (한국건설기술연구원 국민생활연구본부 & 건축안전연구센터) ;
  • 김민준 (한국지질자원연구원 심지층연구센터)
  • Jeon, Yoon-Soo (Department of Civil and Environment Engineering, Korea Advanced Institute of Science and Technology) ;
  • Lee, Seung-Rae (Department of Civil and Environment Engineering, Korea Advanced Institute of Science and Technology) ;
  • Kim, Min-Seop (Department of Civil and Environment Engineering, Korea Advanced Institute of Science and Technology) ;
  • Jeon, Jun-Seo (Building Safety Research Center & Seismic Safety Research Center, Korea Institute of Civil Engineering and Building Technology) ;
  • Kim, Min-Jun (Deep Subsurface Research Center, Korea Institute of Geoscience and Mineral Resources)
  • 투고 : 2019.10.18
  • 심사 : 2019.11.26
  • 발행 : 2019.12.31
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초록

완충재는 심지층 고준위 방사성 폐기물 저장소의 주요 구성 요소이다. 벤토나이트는 높은 열전도율과 낮은 수리투과성의 특성으로 완충재의 핵심 구성 요소로 다수의 국가에서 채택되었다. 심층 처분은 지하수 유입을 일으키고 이는 완충재 및 뒷채움재의 팽윤압을 초래한다. 완충재에서 발생하는 고압의 팽윤압은 처분용기에 영향을 줄 수 있기에 정밀한 완충재의 팽윤압 예측은 안전한 처분 시스템 구축에 있어서 필수적이다. 따라서 본 연구에서는 MX-80 벤토나이트의 수리역학적 거동에 대한 팽윤압 예측 모델을 세우고, 그 결과를 토대로 민감도 분석을 시행하였다.

A buffer is the major component of a high level radioactive waste repository. Due to their thermal conductivity and low permeability, bentonites have been considered as a key component of a buffer system in most countries. The deep geological condition generates ground water inflow and results in swelling pressure in the buffer and backfill. Investigation of swelling pressure of bentonite buffer is an important task for the safe disposal system. The swelling pressure that can be critical is affected by mechanical and hydro properties of the system. Therefore, in this study, a sensitivity analysis was conducted to examine the effect of hydro-mechanical (HM) behaviors in the MX-80 bentonite. Based on the results of the swelling pressure generation with HM model parameters, a coupled HM analysis of an unsaturated buffer and backfill in a deep geological repository was also carried out to investigate the major factor of the swelling pressure generation.

키워드

참고문헌

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