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2020 Vol.30, Issue 2 Preview Page

Research Article

Relationship between In-situ Hydraulic Conductivity and Van Genuchten Parameters of Unsaturated Fractured Hornfels

불포화 균열 혼펠스의 현장 수리전도도와 반 게누텐 매개변수의 상관성

Jae-Yeol Cheong1
,
HyunJin Cho2
,
Soo-Gin Kim2
,
Soonil Ok2
,
Kue-Young Kim3
,
Se-Yeong Hamm4*
정 재열1
,
조 현진2
,
김 수진2
,
옥 순일2
,
김 구영3
,
함 세영4*
1Principal Researcher, Safety Assessment Team, Korea Radioactive Waste Agency
2Manager, Safety Assessment Team, Korea Radioactive Waste Agency
3Principal Researcher, Center for CO2 Geological Storage, Korea Institute of Geoscience and Mineral Resources
4Professor, Department of Geological Sciences, Pusan National University
1한국원자력환경공단 안전평가팀 책임연구원
2한국원자력환경공단 안전평가팀 과장
3한국지질자원연구원 CO2지중저장연구단 책임연구원
4부산대학교 지질환경과학과 교수
*Corresponding Author
30 June 2020. pp. 147-160
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Abstract

Unsaturated hydraulic conductivity of near-surface unconsolidated layers depends on the physical properties and water content of the unconsolidated layers. So far, many studies have been conducted on the unsaturated hydraulic conductivity of near-surface unconsolidated layers. However, researches on hydraulic conductivity of unsaturated fractured rocks have been relatively rare. In relation to the construction of a low/intermediate level radioactive waste surface-disposal facility, this study compared and analyzed van Genuchten parameters (α, n) in the laboratory and the hydraulic conductivity obtained in field tests for fractured hornfels at a radioactive-waste disposal site of Korea. The relationship between the field hydraulic conductivity and van Genuchten parameters using data from the ten depth intervals of three boreholes resulted in that the correlation coefficient (R) between the hydraulic conductivity and the van Genuchten parameter α was 0.7607, showing positive correlation whereas the R between the hydraulic conductivity and the van Genuchten shape-defining parameter n was -0.8720, showing negative correlation. Hence, this study confirmed the relationship between the field hydraulic conductivity and the van Genuchten unsaturated functions for the unsaturated fractured hornfels.

Keywords
unsaturated zone
hornfels
hydraulic conductivity
falling head test
constant pressure test
van Genuchten model

지표 미고결퇴적층의 불포화 수리전도도는 지표 퇴적층의 물리적 성질과 함수비에 좌우된다. 지금까지 지표 미고결퇴적층의 불포화 수리전도도에 대하여 많은 연구가 수행되어왔다. 그러나 불포화 균열암반에 대한 수리전도도에 대해서는 상대적으로 연구가 적은 편이다. 중 ‧ 저준위 방폐물의 표층처분시설 건설과 관련하여, 본 연구에서는 국내 방사성폐기물 처분부지 내 균열 혼펠스 암반에 대하여 반 게누텐 불포화함수(α, n)와 현장시험에서 얻어진 수리전도도를 서로 비교 ‧ 분석하였다. 현장수리시험과 실내수리시험이 동시에 이루어진 지하수공 3공의 10개 구간에 대한 현장 수리전도도와 반 게누텐 매개변수에 대한 상관성 분석 결과, 현장 수리전도도와 매개변수α의 상관계수는 0.7607로 양의 상관관계를 보이며, 현장 수리전도도와 반 게누텐 형상관련 매개변수 n의 상관계수는 -0.8720으로 음의 상관관계를 보였다. 그러므로 이 연구는 불포화 균열 혼펠스에서 현장수리전도도와 실내수리시험에 의한 불포화함수의 관계를 확인하였다.

키워드
불포화대
혼펠스
수리전도도
수위강하시험
정압주입시험
반 게누텐 모델
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 30
  • No :2
  • Pages :147-160
  • Received Date : 2020-05-20
  • Revised Date : 2020-06-09
  • Accepted Date : 2020-06-12
  • DOI :https://doi.org/10.9720/kseg.2020.2.147
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