Electrical Resistivity Distribution Comparing to Cone Resistance with Depth at Embankment Dike Constructed by Dredged Sea Sand

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2009 Vol.46, Issue 2 Preview Page Next Page

Electrical Resistivity Distribution Comparing to Cone Resistance with Depth at Embankment Dike Constructed by Dredged Sea Sand 준설해사로 성토된 방조제 제체 비저항 분포와 다짐특성 비교: 송성호, 이규상, 강미경, 조인기
Sung-Ho Song, Gyu-Sang Lee, Mi-Kyung Kang and In-Ky Cho

30 April 2009. pp. 207-216

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Abstract

We measured resistivities for undisturbed soil samples collected from dredged bank with sea sand, and analyzed those with one-dimensional (1-D) inversion results from small-loop electromagnetic (EM) survey data. From the relationship between the two resistivities, it appeared that calculated resistivities were remarkably consistent with measured resistivities. Correlation relationships between resistivity values and cone resistance were analyzed after comparing inversion results with cone resistance. It turns out that the region with below 1 ohm-m is correspondent to that of with less than 50 kgf/cm2 in dredged bank with sea sand. From the relationship between the two values, cone resistance shows positive correlation as resistivity increases. It would be also estimated that the loss of dredged sand or a bad hardening can be occurred when resistivity value is lower than that of adjacent regions in an embankment dike because cone resistance is directly related to density affected by the hardening condition. From the study result, resistivity monitoring of small-loop EM periodically is considered to be necessary to maintain the stability of embankment dike.

Keywords

Dredged bank with sea sand

Small-loop EM

1-D inversion

Cone resistance

준설해사를 이용하여 성토된 방조제 제체에서 채취한 시료에 대하여 전기비저항을 실측하였으며, 동일한 위치에 대하여 소형루프 전자탐사의 1차원 역산 자료를 비교 분석하여 상관성이 나타남을 확인하였다. 또한 소형루프 전자탐사 결과를 콘관입시험 결과와 비교하여, 비저항값과 콘저항치와의 상관성을 분석하였다. 분석 결과 준설해사로 성토된 방조제의 경우 비저항이 1 ohm-m 이하인 구간과 콘저항치가 50 kgf/cm2 이하로 낮은 값을 나타내는 구간이 일치하며, 비저항값이 높아짐에 따라 콘저항치가 증가하는 선형적인 상관관계가 있는 것으로 나타났다. 콘저항치는 매질의 다짐상태에 따른 밀도와의 상관성이 크기 때문에, 준설해사로 성토된 방조제 제체에서 비저항값이 주변보다 낮은 경우에는 다짐불량 또는 성토재 유실의 가능성을 판단할 수 있다. 따라서 준설해사로 성토된 방조제의 경우 정기적인 비저항 모니터링 방법을 이용한 방조제 제체 안정성 검토 방법이 필요할 것으로 판단된다.

키워드

준설해사

소형루프 전자탐사

1차원 역산

콘저항치

References

농림부, 한국농촌공사, 2006, 끝막이 구간의 필터 및 준설해사 단면축조 기법 개발 보고서.
농어촌진흥공사, 1995, 한국의 간척.
농업기반공사, 2003, ○○지구 방조제 안전점검 보고서.
송윤호, 정승환, 2002, “소형루프 전자탐사의 감도분석 및 가탐심도 추정,” 물리탐사, 제5권, pp. 299-308.
임진택, 조인기, 2003, “소형루프 전자탐사법에 의한 지하 영상화,” 물리탐사, 제6권, pp. 187-194.
조인기, 임진택, 2003, “주파수 수직 전자탐사 자료의 1차 원 역산,” 물리탐사, 제6권, pp. 180-186.
Craig, R.F., 2007, Soil Mechanics, 6th ED, Taylor and Francis.
Friedman, G.M. and Sanders, J.E., 1978, Principles of Sedimentology. John Wiley, New York.
Liu, C. and Evett, J.B., 2007, Soils and Foundations, Prentice Halls.
Lunne, T., Robetson, P.K., and Powell, J., 1997, Cone Penetrating Testing in Geotechnical Practice, Blackie
Academic & Professional.
Song, S.H. Lee, G.S., Kang, M.K., Kim, Y.I., Kim, Y.B., and Cho, I.K., 2008, “Streamer Resistivity Survey to Evaluate Hydrogeological Sequences at the Bottom of Shallow Brackish Reservoir,” Proceeding of the 119th SEGJ Conference, Tokyo, Oct. 21-23, pp. 139-142.
Swedish Geotechnical Society, 1995, Recommended Standard for Cone Penetration Tests, Proc. of CPT’95 Oct. 4-5, 1995 SGF Report 3:95.
Telford, W.M., Geldart, L.P., and Sheriff, R.E., 1990, Applied geophysics, 2nd ed., Cambridge Univ. Press, Cambridge.
Terzaghi, K. and Peck, R.B., 1967, Soil Mechanics in Engineering Practice, John Wiley & Sons, New york.
Won, I.J., Keiswetter, D.A., Fields, G.R.A., and Sutton, L.C., 1996, “GEM-2: A New Multifrequency Electromagnetic Sensor,” Journal of Environmental and Engineering Geophysics, Vol. 1, pp. 129-137.
Yi, M.J., Kim, J.H., and Chung, S.H., 2003, “Enhancing the resolving power of least-square inversion with active constraint balancing,” Geophysics, Vol. 68, pp. 931-941.

Information

Publisher :The Korean Society of Mineral and Energy Resources Engineers
Publisher(Ko) :한국자원공학회
Journal Title :Journal of the Korean Society for Geosystem Engineering
Journal Title(Ko) :한국지구시스템공학회지
Volume : 46
No :2
Pages :207-216

[1] 농림부, 한국농촌공사, 2006, 끝막이 구간의 필터 및 준설해사 단면축조 기법 개발 보고서.

[2] 농어촌진흥공사, 1995, 한국의 간척.

[3] 농업기반공사, 2003, ○○지구 방조제 안전점검 보고서.

[4] 송윤호, 정승환, 2002, “소형루프 전자탐사의 감도분석 및 가탐심도 추정,” 물리탐사, 제5권, pp. 299-308.

[5] 임진택, 조인기, 2003, “소형루프 전자탐사법에 의한 지하 영상화,” 물리탐사, 제6권, pp. 187-194.

[6] 조인기, 임진택, 2003, “주파수 수직 전자탐사 자료의 1차 원 역산,” 물리탐사, 제6권, pp. 180-186.

[7] Craig, R.F., 2007, Soil Mechanics, 6th ED, Taylor and Francis.

[8] Friedman, G.M. and Sanders, J.E., 1978, Principles of Sedimentology. John Wiley, New York.

[9] Liu, C. and Evett, J.B., 2007, Soils and Foundations, Prentice Halls.

[10] Lunne, T., Robetson, P.K., and Powell, J., 1997, Cone Penetrating Testing in Geotechnical Practice, Blackie

[11] Academic & Professional.

[12] Song, S.H. Lee, G.S., Kang, M.K., Kim, Y.I., Kim, Y.B., and Cho, I.K., 2008, “Streamer Resistivity Survey to Evaluate Hydrogeological Sequences at the Bottom of Shallow Brackish Reservoir,” Proceeding of the 119th SEGJ Conference, Tokyo, Oct. 21-23, pp. 139-142.

[13] Swedish Geotechnical Society, 1995, Recommended Standard for Cone Penetration Tests, Proc. of CPT’95 Oct. 4-5, 1995 SGF Report 3:95.

[14] Telford, W.M., Geldart, L.P., and Sheriff, R.E., 1990, Applied geophysics, 2nd ed., Cambridge Univ. Press, Cambridge.

[15] Terzaghi, K. and Peck, R.B., 1967, Soil Mechanics in Engineering Practice, John Wiley & Sons, New york.

[16] Won, I.J., Keiswetter, D.A., Fields, G.R.A., and Sutton, L.C., 1996, “GEM-2: A New Multifrequency Electromagnetic Sensor,” Journal of Environmental and Engineering Geophysics, Vol. 1, pp. 129-137.

[17] Yi, M.J., Kim, J.H., and Chung, S.H., 2003, “Enhancing the resolving power of least-square inversion with active constraint balancing,” Geophysics, Vol. 68, pp. 931-941.

Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

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