All Issue

2013 Vol.29, Issue 5 Preview Page
A Study on the Estimation of Stability of Fill Dam by Long-term Electrical Resistivity Monitoring

장주기 전기비저항 모니터링 기법을 이용한 필댐의 안정성 평가

Gi-Ho Kim1
,
Heui-Dae Lim2
,
Hee-Yoon Ahn3*
김 기호1
,
임 희대2
,
안 희윤3*
1Director General, Nakdong River Integrated Operations Center, K-water
2Prof., Dept. of Civil Engrg., Chungnam National Univ.
3Director, Heesong Geotek Co., Ltd.
1한국수자원공사 낙동강 통합물관리센터 센터장
2충남대학교 토목공학과 교수
3(주)희송지오텍 이사
*교신저자. *Corresponding Author. 
31 May 2013. pp. 53-64
PDF XML Citation
Abstract

Resistivity monitoring is based on the fact that a change in the porosity leads to the changes in water content and fine particles, which alter the electrical resistivity. At every embankment dam, internal erosion always occurs as time passes. The internal erosion generally develops into piping over a long time by backward erosion and concentrated leak, and finally leads to dam failure. Resistivity is known to be very sensitive to the changes in porosity in embankment dams. Thus resistivity monitoring is a reasonable method to find out the leakage zone. However, resistivity is strongly influenced by seasonal variation of temperature, TDS of reservoir water and water level. In this paper. we first installed electrodes permanently at the center of the crest. The electrical resistivity monitoring data was acquired every 6 hours from Apr. 3, 2011 to July. 31, 2012. To analyze the characteristics of monitoring data, each resistivity data was calculated from up to 2,950 data sets. The result indicated a seasonal resistivity variation due to related temperature. Finally, a quantitative method to estimate porosities of the embankment dam from the resistivity monitoring data was analyzed. The applicability and reliability were verified and the importance of electrical resistivity monitoring for obtaining reliable result was emphasized.

Keywords
Electrical resistivity monitoring
Fill dam
Internal erosion
Seepage

전기비저항 모니터링 탐사법은 공극의 변화는 입자와 함수율의 변화에 기인한다는 사실에 근간을 두고 있다. 모든 댐에서 내부 침식은 시간이 지날수록 발생하며, 시간이 지남에 따라 누수가 집중되고 결국 댐의 파괴에 이르게 한다. 전기비저항은 제체내 공극의 변화에 매우 민감하게 변화하는 것으로 알려져 있어 전기비저항 모니터링 탐사법은 누수탐지에 효과적으로 적용되어 왔다. 그러나 전기비저항은 온도의 계절 변화와 총고용용존물, 운영수위 등의 변화에 큰 영향을 받는다. 본 논문에서 우리는 댐마루 중앙부에 영구적으로 전극을 설치하고 2011년 4월 3일부터 2012년 7월 31일까지 매 6시간 마다 전기비저항 모니터링 탐사 자료를 획득하였다. 모니터링 데이터의 해석을 위해 각 전기비저항 데이터의 2,950여개가 넘는 데이터를 분석하였다. 그 결과 전기비저항은 온도의 영향으로 계절변화에 따라 변화함을 확인할 수 있었으며, 전기비저항 모니터링탐사로부터 제체의 공극률을 산출하고 분석하였다. 댐체에서 전기비저항 모니터링 탐사의 적용성과 안정성을 확인하였으며, 신뢰할 만한 전기비저항 모니터링 데이터의 중요성을 강조할 수 있었다.

References
1
1.Archie, G. E. (1942), The electrical resistivity log as an aid in determining some reservoir characteristics, Trans. AIME, 146, 54-62.
2
2.Ahn, H. B. and Lim, H. D. (2010), Analysis of Electrical Resistivity Change in Piping Simulation of a Fill Dam, Journal of the Korean geotechnical society, Vol.26, No.4, pp.59-68.
3
3.Cho, I. K., Kang, H. J., Lee, B. H., Kim, B. H., Lee, S. S., Park, Y. K., and Lee, B, H. (2006), Safety Index Evaluation from Resistivity Monitoring Data for a Reservoir Dyke, Geophysical exploration, Vol.9, No.2, pp.155-162.
4
4.Chung, S. H., Kim, J. H., Yang, J. M., and Kim, Y. W. (1992), Delineation of water seepage in earth-fill embankments by electrical resistivity method, The journal of engineering geology, Vol.2, No.1, pp.47-57.
5
5.Ha, M. J., Cho, I. K., and Yong, H. H. (2012), Time-lapse Inversion of Electrical Resistivity Monitoring, Korean Society for Geosystem Engineering Symposium, 2012 May 3, pp.1-20.
6
6.Hayley, K., L. R. Bentley, M. Gharibi, and M. Nightingale (2007), Low temperature dependence of electrical resistivity: Implications for near surface geophysical monitoring, Geophys. Res. Lett., 34, L18402, doi:10.1029/2007GL031124
7
7.Hayley, K., L. R. Bentley,and M. Gharibi (2009), Time-lapse electrical resistivity monitoring of salt-affected soil and groundwater, WATER RESOURCES RESEARCH, VOL. 45, W07425.
8
8.Heesong Geotek (2010), Real-time Resistivity Monitoring System (Heesong Geotek Co., Ltd.).
9
9.Park, S. K. and, Kim, H. J. (1999), The State-of-the-Art of Geophysical Exploration Technology applied to Site Characterization in Civil Engineering and Construction in Japan, Conference 1999 Aug. 01, pp.1-20.
10
10.Park, S. K., Song, S. H., Choi, J. H., Choi, K. B., and Lee, B. H. (2002), Applicability of Geophysical Prospecting for water leakage detection in water utilization facilities, Symposium, 2002 Sept. 01, pp.179-195.
11
11.Sam Johansson (1997), Seepage Monitoring in Embankment Dams, ISBN 91-7170-792-1.
12
12.Schlumberger (1972), Log Interpretation: V.I. Principles: New York (Schlumberger Ltd.)
13
13.Song, S. H., Yong, H. H., An, J. K., and Kim, K. P. (2003), Application of Electrical and Small-Loop EM survey to the Identification of the Leachate at a Waste Landfill in Jeiu Island Geophysical exploration, Vol.6, No.3, pp.143-152.
Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 29
  • No :5
  • Pages :53-64
  • Received Date : 2013-03-27
  • Accepted Date : 2013-05-08
  • DOI :https://doi.org/10.7843/kgs.2013.29.5.53
Journal Informaiton Journal of the Korean Geotechnical Society Journal of the Korean Geotechnical Society
Archives
: Vol.23~28 (2007~2012)
  • NRF
  • KOFST
  • KISTI Current Status
  • KISTI Cited-by
  • crosscheck
  • orcid
  • open access
  • ccl
Journal Informaiton Journal Informaiton - close