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2020 Vol.30, Issue 3 Preview Page

Research Article

Applicability of Pulse Tests to Estimate Transmissivity in Crystalline Rock

결정질 암반의 투수량계수 도출을 위한 펄스시험의 적용성 연구

Kyung-Woo Park1*
,
Byeong-Hak Park2
,
Nak-Youl Ko3
,
Sung-Hoon Ji1
박 경우1*
,
박 병학2
,
고 낙열3
,
지 성훈1
1Principal Researcher, Korea Atomic Energy Research Institute
2Post Doctorial Researcher, Korea Atomic Energy Research Institute
3Senior Researcher, Korea Atomic Energy Research Institute
1한국원자력연구원 책임연구원
2한국원자력연구원 박사후연구원
3한국원자력연구원 선임연구원
*Corresponding Author
30 September 2020. pp. 223-235
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Abstract

In this study, pulse tests were undertaken at an underground research facility, as part of in-situ hydraulic tests, to derive the hydrogeological characteristics of crystalline rock. The applicability of pulse tests for estimating the transmissivity of a fractured rock mass was evaluated by comparing the results to those from a slug test. Results from the pulse and slug tests were very similar for the test section, with both tests indicating low transmissivity. A slight difference between the results of pulse and slug tests, however, was observed in the section with the transmissivity larger than 1 × 10-8 m2/s, which is likely due to the difference in the radii of influence of the tests. Furthermore, when the pulse test was conducted in permeable zones where transmissivity was larger than 1 × 10-7 m2/s, it was difficult to produce accurate results. This lack of accuracy was due to the rapid recovery of the hydraulic head in these permeable test zones. When performing pulse tests, it was important to accurately measure the pressure when valves were opened and closed in order to apply the head change in the test section. Although it is difficult to derive the hydrogeological characteristics from pulse tests in areas with high permeability, these tests can be used as an economical test method for identifying hydrogeological characteristics in a relatively short time, especially when deriving the transmissivity of rocks with low permeability.

Keywords
crystalline rock
underground research facility
in-situ hydraulic test
pulse test
slug test

본 논문에서는 결정질 암반에 건설된 지하연구시설에서 암반의 수리지질특성을 도출하기 위해 수행할 수 있는 현장수리시험의 방법으로 펄스시험을 소개하였다. 아울러 지하연구시설에서 수행한 슬러그시험과 펄스시험의 결과를 비교하여 결정질 암반의 수리지질특성 도출에 대한 펄스시험의 적용 가능성을 평가하였다. 펄스시험과 슬러그시험의 결과를 비교해 볼 때, 매질의 투수성이 낮은 시험구간에서는 그 결과가 매우 유사하게 도출되었지만 투수량계수가 1 × 10-8 m2/s 이상인 구간에서는 약간의 차이를 확인할 수 있었다. 이러한 투수성의 차이는 수리시험 시 적용되는 수리 영향 반경의 차이에서 기인한 것으로 판단된다. 또한 시험결과를 통하여 펄스시험을 투수량계수가 1 × 10-7 m2/s 이상인 시험구간에서 수행할 때, 시험 중 빠른 수두회복 때문에 정확한 시험결과를 도출하기 어렵다는 것을 알 수 있었다. 펄스시험은 비록 투수성이 큰 구간에서 수리지질특성을 도출하기 어렵지만, 저투수성 매질의 암반에서의 수리지질특성을 도출할 때 비교적 빠른 시간에 수리지질특성을 파악할 수 있는 경제적인 시험 방법이라고 제안할 수 있다.

키워드
결정질 암반
지하연구시설
현장수리시험
펄스시험
슬러그시험
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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 :3
  • Pages :223-235
  • Received Date : 2020-07-17
  • Revised Date : 2020-08-25
  • Accepted Date : 2020-08-27
  • DOI :https://doi.org/10.9720/kseg.2020.3.223
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