Tunnel and Underground Space (터널과지하공간)

Korean Society for Rock Mechanics and Rock Engineering (한국암반공학회)
권호 표지
DOI QR코드

DOI QR Code

Standard Procedures and Field Application Case of Constant Pressure Injection Test for Evaluating Hydrogeological Characteristics in Deep Fractured Rock Aquifer

고심도 균열암반대수층 수리지질특성 평가를 위한 정압주입시험 조사절차 및 현장적용사례 연구

  • Hangbok Lee (Deep Subsurface Storage and Disposal Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Chan Park (Deep Subsurface Storage and Disposal Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Eui-Seob Park (Deep Subsurface Storage and Disposal Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Yong-Bok Jung (Deep Subsurface Storage and Disposal Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Dae-Sung Cheon (Deep Subsurface Storage and Disposal Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • SeongHo Bae (GeoGeny Consultants Group Inc.) ;
  • Hyung-Mok Kim (Department of Energy Resources and Geosystems Engineering, Sejong University) ;
  • Ki Seog Kim (Heesong Geotek, Co., Ltd.)
  • 이항복 (한국지질자원연구원 심층처분환경연구센터 ) ;
  • 박찬 (한국지질자원연구원 심층처분환경연구센터 ) ;
  • 박의섭 (한국지질자원연구원 심층처분환경연구센터 ) ;
  • 정용복 (한국지질자원연구원 심층처분환경연구센터 ) ;
  • 천대 (한국지질자원연구원 심층처분환경연구센터 ) ;
  • 배성호 ((주)지오제니컨설턴트 ) ;
  • 김형목 (세종대학교 지구자원시스템공학과) ;
  • 김기석 ((주)희송지오텍 )
  • Received : 2023.10.10
  • Accepted : 2023.10.16
  • Published : 2023.10.31
Download PDF
⟨ Previous Next ⟩

Abstract

In relation to the high-level radioactive waste disposal project in deep fractured rock aquifer environments, it is essential to evaluate hydrogeological characteristics for evaluating the suitability of the site and operational stability. Such subsurface hydrogeological data is obtained through in-situ tests using boreholes excavated at the target site. The accuracy and reliability of the investigation results are directly related to the selection of appropriate test methods, the performance of the investigation system, standardization of the investigation procedure. In this report, we introduce the detailed procedures for the representative test method, the constant pressure injection test (CPIT), which is used to determine the key hydrogeological parameters of the subsurface fractured rock aquifer, namely hydraulic conductivity and storativity. This report further refines the standard test method suggested by the KSRM in 2022 and includes practical field application case conducted in volcanic rock aquifers where this investigation procedure has been applied.

고심도 균열암반대수층 환경에서 주로 수행되는 방사성폐기물 처분사업과 관련하여, 부지적합성 및 운영 시 안정성 평가를 평가하는데 있어 해당 대상 부지의 수리지질특성 평가는 필수적이다. 이러한 심부 수리지질 특성평가에 사용되는 인자 자료는 대상 부지에 굴착된 시추공을 이용한 원위치 수리시험을 통해 얻어지는데, 이 때 조사 결과의 정확도와 신뢰성은 적합한 시험방법의 선택, 조사 시스템의 성능, 조사절차의 표준화와 직접적으로 연결된다. 본 보고에서는 심부 암반대수층의 핵심 수리지질 평가인자인 수리전도도와 저류계수를 구하기 위한 대표적인 시험법인 정압주입시험의 상세조사절차를 소개하였다. 본 보고는 2022년도에 제안한 암반공학회 정압주입시험 관련 표준시험법 자료를 보완하여 구체화 하였으며, 본 조사절차가 실제 적용된 화산암 지역 시추공 현장적용 사례도 함께 소개하였다.

Keywords

Acknowledgement

본 연구는 한국지질자원연구원 기본사업인 '심지층 개발과 활용을 위한 지하심부 특성평가 기술 개발(과제코드 : GP2020-010, 과제번호: 23-3414)' 및 'HLW 심층처분을 위한 지체구조별 암종 심부 특성 연구(과제코드 : GP2020-002, 과제 번호: 23-3115)'의 일환으로 수행되었습니다.

References

  1. Bae, S.H., Kim, H.S., Kim, J.S., Park, E.S., Jo, Y.U., Ji, T.G., and Won, K.S., 2021, Hydraulic characteristics of deep and low permeable rock masses in Gyeongju area by high precision constant pressure injection test, Tunnel and Underground Space, 31(4), 243-269. https://doi.org/10.7474/TUS.2021.31.4.243
  2. Barker, J.A., 1988, A generalized radial flow model for hydraulic tests in fractured rock, Water Resources Research, 24(10), 1796-1804. https://doi.org/10.1029/WR024i010p01796
  3. Doe, T.W. and Geier, J.E., 1990, Interpretation of fracture system geometry using well test data, Stripa project 91-03, SKB, Stockholm.
  4. Enachescu, C. and Rahm, N., 2007, Method evaluation of single hole hydraulic injection tests at site investigations Oskarshamn, P-07-79, SKB, Stockholm.
  5. Follin, S., Ludvigson, J.E., and Leven, J., 2011, A comparison between standard well test evaluation methods used in SKB's site investigations and the generalized radial flow concept, P-06-54, SKB, Stockholm.
  6. Isherwood, D., 1979, Geoscience data base handbook for modelling nuclear waste repository, vol. 1, NUREG/CR-0912, UCRL-52719.
  7. Jacob, C.E. and Lohman, S.W., 1952, Non-steady flow to a well of constant drawdown in an extensive aquifer, Trans. American Geophys. Union, 33(4), 559-569. https://doi.org/10.1029/TR033i004p00559
  8. Kim, H.M., Guglielm, Y., Rutqvist, J., and Park, E.S., 2019, A technical review of hydromechanical properties of jointed rock mass accompanied by fluid injection, Tunnel and Underground Space, 29(1), 12-29. https://doi.org/10.7474/TUS.2019.29.1.012
  9. Kuang, X., Jiao, J.J., Zheng, C., Cherry, J.A., and Li, H., 2020, A review of specific storage in aquifers, Journal of Hydrology, 581, 124383.
  10. Kuusela-Lahtinen, A., Niemi, A., and Luukkonen, A., 2003, Flow dimension as an indicator of hydraulic behavior in site characterization of fractured rock, Ground Water, 41(3), 333-341. https://doi.org/10.1111/j.1745-6584.2003.tb02602.x
  11. Lee, H., Park, C., Jung, Y.B., Bae, S.H., and Kim, H.M., 2022, Standard method for determination of in-situ hydraulic properties (transmissivity & storage coefficient) using constant pressure injection test, Korean Society for Rock Mechanics and Rock Engineering, pp. 1-5.
  12. Moye, D.G., 1967, Diamond drilling for foundation exploration, Civil Engineering Transactions, Institute of Engineering, Australia, 95-100.
  13. Walter, S., Arno, T., Hansruedi F., and Hans-Jurg, G., 2006, Geohydraulic tests in rock, 82.