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2023 Vol.33, Issue 4

Research Article

Study on Moye’s Method for Analysis of Constant-Head Tests Conducted in Crystalline Rock

결정질 암반에서 Moye 방법을 이용한 정압시험의 해석에 대한 고찰

Kyung-Woo Park12
,
Byeong-Hak Park3
,
Sung-Hoon Ji4
,
Kang-Kun Lee5*
박 경우12
,
박 병학3
,
지 성훈4
,
이 강근5*
1Principal Researcher, Disposal Performance Demonstration R&D Division, Korea Atomic Energy Research Institute
2Ph.D. Student, School of Earth and Environmental Sciences, Seoul National University
3Senior Researcher, Disposal Performance Demonstration R&D Division, Korea Atomic Energy Research Institute
4Principal Researcher, Disposal Safety Evaluation R&D Division, Korea Atomic Energy Research Institute
5Professor, School of Earth and Environmental Sciences, Seoul National University
1한국원자력연구원 저장처분성능검증부 책임연구원
2서울대학교 지구환경과학부 박사과정
3한국원자력연구원 저장처분성능검증부 선임연구원
4한국원자력연구원 저장처분기술개발부 책임연구원
5서울대학교 지구환경과학부 교수
*Corresponding Author
31 December 2023. pp. 519-530
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Abstract

Moye’s analytical solution was examined as a method for constant-head tests under steady-state conditions, and results were compared with transient-state analyses in in situ hydraulic tests. The sensitivity of hydraulic conductivities calculated using Moye’s method increased with the length of the test section, which should be as large as possible under test conditions. Particularly in low-permeability media with less than 10-8 m/sec of hydraulic conductivity, hydraulic conductivity is lower than that under transient-state conditions and can be recalculated by adjusting the boundary between radial and spherical flow assumed in Moye’s equation. Constant-head tests performed in the research borehole at the KAERI Underground Research Tunnel (KURT) indicated that transmissivities derived from the constant-head withdrawal test under transient-state conditions in low-permeability media were higher than those derived from steady-state tests, likely because the groundwater flow boundary was smaller than the “half of the test-section length”assumed by Moye’s equation. When interpreting constant-head test results for crystalline rock, the hydrogeological properties of the medium may be better understood by considering assumed conditions accompanying analysis of the steady-state condition and comparing them with results for the transient-state analysis, rather than simply assuming properties based on steady-state analyses.

Keywords
constant-head test
Moye’s formula
KURT
radial flow
spherical flow

본 논문에서는 정류 상태의 정압시험에 대한 해석 방법 중 Moye 해석해를 고찰해 보았으며, 현장수리시험에서 정압시험에 대한 정류 상태의 해석과 부정류 상태의 해석에 대해 비교해 보았다. Moye 해석해로 산출한 수리전도도는 시험 구간의 크기가 작을수록 민감도가 커지기 때문에 시험 구간의 길이를 가능한 시험 조건에서 크게 설정하여 현장수리시험을 수행하는 것이 바람직하다. 특히 10-8 m/sec 이하의 수리전도도를 갖는 저투수성 매질에서는 부정류 상태의 해석 결과에 비해 Moye 해석해로 도출한 수리전도도의 값이 작게 도출되는데, 이는 Moye 식에서 가정한 방사성 흐름과 구상 흐름의 경계면을 조정할 경우 보완할 수 있었다. KURT내 연구용 시험공에서 수행한 정압시험 결과, 저투수성 매질에서 부정류 상태의 시험을 통해 도출한 투수성이 정류 상태의 결과에 비해 큰 값이 도출되었다. 이는 정압시험에 의해 형성되는 방사상 흐름에서 구상 흐름으로 바뀌는 지하수 흐름의 경계면이 Moye 식에서 가정한 ‘시험구간 길이의 절반’보다 작게 형성되었기 때문으로 판단되며, 결국 결정질 암반에서 수행한 정압시험을 해석할 때 단순히 정류 상태의 해석으로 매질의 수리지질특성을 판단하기보다는 정류 상태의 해석에서 수반되는 가정 조건을 고려하여 부정류 상태의 시험 결과와 함께 비교하여 해석한다면 매질의 수리지질특성을 보다 잘 이해할 수 있을 것으로 사료된다.

키워드
정압시험
Moye 해석해
KURT
방사성 흐름
구상 흐름
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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 : 33
  • No :4
  • Pages :519-530
  • Received Date : 2023-10-30
  • Revised Date : 2023-12-04
  • Accepted Date : 2023-12-05
  • DOI :https://doi.org/10.9720/kseg.2023.4.519
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