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2024 Vol.34, Issue 1 Preview Page

Research Article

Effect of Confining Pressure, Temperature, and Porosity on Permeability of Daejeon Granite: Experimental Study

대전 화강암의 투수계수에 미치는 구속압, 온도, 공극률의 영향: 실험적 연구

Donggil Lee1
,
Seokwon Jeon2*
이 동길1
,
전 석원2*
1Graduate Student, Department of Energy Systems Engineering, Seoul National University
2Professor, Department of Energy Systems Engineering, Seoul National University
1서울대학교 에너지시스템공학부 대학원생
2서울대학교 에너지시스템공학부 교수
*Corresponding Author
29 February 2024. pp. 71-87
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Abstract

In deep geological disposal of high-level radioactive waste, the surrounding rock at the immediate vicinity of the deposition hole may experience localized changes in permeability due to in-situ stress at depth, swelling pressure from resaturated bentonite buffer, and the heat generated from the decay of radioactive isotopes. In this study, experimental data on changes in permeability of granite, a promising candidate rock type in South Korea, were obtained by applying various confining pressures and temperature conditions expected in the actual disposal environment. By conducting the permeability test on KURT granite specimens under three or more hydrostatic pressure conditions, the relation in which the permeability decreases exponentially as the confining pressure increases was derived. The temperature- induced changes in permeability were found to be negligible at temperatures below the expected maximum of 90°C. In addition, by establishing a relation in which the initial permeability is proportional to the power of the initial porosity, it was possible to estimate permeability value for granite with a specific porosity under a certain confining pressure.

Keywords
KURT granite
Permeability
Confining pressure
Temperature, Porosity

고준위방사성폐기물 심층처분 시, 처분공 주변의 근계암반은 높은 지중응력과 재포화된 벤토나이트 완충재의 팽윤압, 방사성 원소 붕괴열의 영향을 받아 국부적으로 투수계수가 변화될 수 있다. 본 연구에서는 국내 유력한 처분 대상 부지 암종 중의 하나인 결정질 경암으로서의 화강암을 대상으로, 실제 처분 환경에서 예상되는 다양한 구속압과 온도 조건을 적용하여 투수계수 변화 특성을 실험적인 방법을 통하여 고찰하고자 하였다. KURT 화강암 시험편 하나당 3개 이상의 정수압 조건에서 투수시험을 수행하여 구속압이 증가함에 따라 투수계수가 지수적으로 감소하는 관계를 도출하였다. 예상 최대 온도로 설정한 90°C 이하 수준에서는 온도에 의한 투수계수 변화가 무시 가능할 정도로 작음을 확인하였다. 추가로 초기투수계수가 초기공극률의 거듭제곱에 비례하는 상관관계를 도출함으로써, 특정 공극률을 지닌 화강암이 일정 구속압 하에 있을 때 가지는 투수계수 값을 유추할 수 있었다.

키워드
KURT 화강암
투수계수
구속압
온도
공극률
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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 : 34
  • No :1
  • Pages :71-87
  • Received Date : 2024-02-13
  • Revised Date : 2024-02-22
  • Accepted Date : 2024-02-23
  • DOI :https://doi.org/10.7474/TUS.2024.34.1.071
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