Tunnel and Underground Space (터널과지하공간)

Korean Society for Rock Mechanics and Rock Engineering (한국암반공학회)
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Case Studies on the Experiments for Long-Term Shear Behavior of Rock Discontinuities

암반 내 불연속면의 장기 전단 거동 평가를 위한 고찰

  • Juhyi Yim (Convergence and Open Sharing System for New Energy Industry, Seoul National University) ;
  • Saeha Kwon (Korea Atomic Energy Research Institute (KAERI)) ;
  • Seungbeom Choi (Korea Atomic Energy Research Institute (KAERI)) ;
  • Taehyun Kim (Korea Atomic Energy Research Institute (KAERI)) ;
  • Ki-Bok Min (Department of Energy Resources Engineering, Seoul National University)
  • 임주휘 (서울대학교 에너지신산업 혁신공유대학사업단) ;
  • 권새하 (한국원자력연구원) ;
  • 최승범 (한국원자력연구원) ;
  • 김태현 (한국원자력연구원 ) ;
  • 민기복 (서울대학교 에너지자원공학과)
  • Received : 2023.02.06
  • Accepted : 2023.02.17
  • Published : 2023.02.28
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Abstract

Long-term shear behavior of the rock discontinuities should be analyzed and its stability should be evaluated to ensure the long-term stability of a high-level radioactive waste disposal repository. The long-term shear behavior of the discontinuities can be modeled with creep and RSF models. The shear creep test, velocity step test, and slide-hold-slide test can be performed to determine their model parameters or analyze the shear behavior by experiments under various conditions. Testing apparatuses for direct shear, triaxial compression, and biaxial shear were mainly used and improved to reproduce the thermo-hydro-mechanical conditions of local bedrock, and it was confirmed that the shear behavior could vary. In order to design a high-level radioactive waste disposal site in Korea, the long-term behavior of rock discontinuities should be investigated in consideration of rock types, thermo-hydro-mechanical conditions, metamorphism, and restoration of shear resistance.

고준위방사성폐기물 처분장의 장기 안정성을 확보하기 위해서 암반 불연속면의 장기적인 전단 거동을 분석하고 그 안정성을 평가해야 한다. 암반 불연속면의 장기 전단 거동은 크리프 모델, RSF 모델로 모사될 수 있고, 전단 크리프 시험, 속도 단계 시험, 슬라이드-홀드-슬라이드 시험을 통해 모델에 필요한 파라미터를 결정하거나 여러 조건에서 전단 거동을 분석하는 실험을 수행할 수 있다. 기존 연구에 따르면 전단 실험을 위하여 직접전단시험기, 삼축압축시험기, 이축전단시험기가 주로 이용되었으며 현지 암반의 열-수리-역학적인 조건을 재현하기 위해 다양하게 개선된 장비가 이용되었고 그에 따라 다양한 양상의 전단 거동이 관찰되었다. 그러므로 국내 고준위방사성폐기물 처분장을 설계하기 위해서 처분장 부지의 암종, 열-수리-역학적 조건, 광물의 변성, 그리고 전단 저항의 회복 등을 고려하여 암반 불연속면의 장기 거동을 검토해야 한다.

Keywords

Acknowledgement

본 연구는 과학기술정보통신부의 재원으로 사용후핵연료관리핵심기술개발사업단(2021M2E1A1085193)의 지원을 받아 수행되었습니다.

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