Development of Electrical Resistivity Survey System for Geotechnical Centrifuge Modeling

Hyung-Ik Cho; Eun-Seok Bang; Myeong-Jong Yi; Yun-Wook Choo; Dong-Soo Kim

doi:10.7843/kgs.2014.30.10.19

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2014 Vol.30, Issue 10 Preview Page Next Page

Development of Electrical Resistivity Survey System for Geotechnical Centrifuge Modeling 원심모형실험을 위한 전기비저항 탐사 시스템 구축

31 October 2014. pp. 19-31

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Abstract

In order to investigate ground state change visually in physical model during centrifuge testing, electrical resistivity survey was adopted. Commercial resistivity survey equipment verified at various in-situ sites was utilized. The resistivity survey equipment installed in centrifuge facility was remotely controlled through intranet and electrical resistivity images obtained while centrifuge testing was being checked by real-time inversion. To verify the stable operation of the developed resistivity survey system, preliminary tests were conducted. Model ground was uniformly constructed using unsaturated soil and saline water was dropped on the ground surface to simulate contaminant flow situation. During the 10 g centrifuge tests, electrical resistivity was continuously detected and the testing results were compared with those of identically carried out 1 g centrifuge tests. In addition, the electrical resistivity was directly measured immediately after the centrifuge test by open cutting the model. Finally, reliability of electrical resistivity survey in the centrifuge test was verified by comparing those testing results.

Keywords

Centrifuge test

Electrical resistivity

Saline water

Monitoring

원심모형실험 중 지반모형의 상태 변화를 입체적으로 파악하기 위한 방법으로 전기비저항 탐사를 시도하였다. 탐사 시스템은 현장에서 널리 사용되는 검증된 상용 장비를 바탕으로 하였다. 컴퓨터 원격 조정으로 실험 시설 내에 설치된 탐사 장비를 통제하고 실시간 해석을 통해 결과 영상을 원심 모형실험 중에 바로 확인할 수 있도록 구성하였다. 구축된 탐사 시스템의 안정적 구동 여부를 점검하기 위해 불포화상태로 조성된 모형 지반 상단에 염수를 떨어뜨려 지반 내부로 이동하게 하고 전기비저항 탐사를 수행하였다. 10g로 원심력을 가한 상태에서 실험을 수행하고 시간대별 염수 침투 상황을 전기비저항 영상으로 확인하였으며 일반 중력장에서 동일하게 실험한 결과와 비교하였다. 실험 종료 뒤 모형지반 수직 절단면을 이용하여 직접 측정한 전기비저항 값과 획득한 영상을 비교함으로써 신뢰성을 검증하였다.

References

1.Bolton, M. D., Gui, M. W., and Phillips, R. (1993), “Review of miniature soil probes for model tests”, Proceedings of 11th Southeast Asian Geotechnical Conference, Singapore, pp.85-90.

2.Chung, S. F., Randolph, M. F., and Schneider, J. A. (2006), “Effect of penetration rate on penetrometer resistance in clay”, Journal of geotechnical and geoenvironmental engineering, Vol.132, No.9, pp.1188-1196.

3.Davies, M. C. R. and Parry, R. H. G. (1982), “Determining the shear strength of clay cakes in the centrifuge using a vane”, Geotechnique, Vol.32, No.1.

4.Depountis, N., Harris, C., and Davies, M. C. R. (2001), “An assessment of miniaturised electrical imaging equipment to monitor pollution plume evolution in scaled centrifuge modelling”, Engineering geology, Vol.60, No.1, pp.83-94.

5.Harris, C., Davies, M. C. R., and Depountis, N. (2000), “Development of a miniaturised electrical imaging apparatus for monitoring contaminant plume evolution during centrifuge modelling”, Proceedings of the International Symposium on Physical Modelling and Testing in Environmental Geotechnics, NECER, France, pp.27-34.

6.Hensley, P. J. and Savvidou, C. S. (1993), “Modelling coupled heat and contaminant transport in groundwater”, International journal for numerical and analytical methods in geomechanics, Vol.17, No.7, pp.493-527.

7.Kechavarzi, C. and Soga, K. (2002), “Determination of water saturation using miniature resistivity probes during intermediate scale and centrifuge multiphase flow laboratory experiments”, ASTM geotechnical testing journal, Vol.25, No.1, pp.95-103.

8.Kim, D. S., Kim, N. R., Choo, Y. W., and Cho, G. C. (2013a), “A newly developed state-of-the-art geotechnical centrifuge in Korea”, KSCE Journal of Civil Engineering, Vol.17, No.1, pp.77-84.

9.Kim, J. H. (2012), ‘DC pro Manual’, Kora Institute of Geoscience and Mineral Resources (KIGAM).

10.Kim, J. H., Kim, D. J., Kim, D. S., and Choo, Y. W. (2013b), “Development of Miniature Cone and Characteristics of Cone Tip Resistance in Centrifuge Model Tests”, Journal of the Korean Society of Civil Engineers, Vol.33, No.2, pp.631-642. (in Korean)

11.Kim, J. H., Yi, M. J., Park, S. G., and Kim, J. G. (2009), “4-D inversion of DC resistivity monitoring data acquired over a dynamically changing earth model”, Journal of Applied Geophysics, Vol.68, No.4, pp.522-532.

12.Kim, N. R. and Kim, D. S. (2010), “A shear wave velocity tomography system for geotechnical centrifuge testing”, ASTM geotechnical testing journal, Vol.33, No.6, pp.434-444.

13.Kim, Y. S., Kim, J. J., Oh, M. H., and Park, J. B. (2007), “Application of Time-Continuous Electrical Resistivity Measurement for Contaminant Detection”, Proceedings of the fall Geosynthetics Conference, pp. 139-144. (in Korean)

14.Ko, J. S., Kim, B. J., Choi, N. C., Kim, S. B., Park, J. A., and Park, C. Y. (2012), “Characterization of an Animal Carcass Disposal Site using Electrical Resistivity Survey”, The journal of engineering geology, Vol.22, No.4, pp.409-416. (in Korean)

15.Oh, S. H. (2008), “The Safety Assessment of Embankment by Three Dimensional Electrical DC Modeling”, Journal of Korean earth science society, Vol.29, No.6, pp.447-453. (in Korean)

16.Oh, S. H. and Suh, B. S. (2008), “Safety Assessment of Embankment by Analysis of Electrical Properties”, Korean Society of Engineering Geology, Vol.18, No.3, pp.245-255. (in Korean)

17.Oh, S. H. and Sun, C. G. (2004), “Analysis of Geophysical and Geotechnical SPT Data for the Safety Evaluation of Fill Dam”, Journal of the Korean Geophysical Society, Vol.7, No.3, pp.171-183. (in Korean)

Information

Publisher :The Korean Geotechnical Society
Publisher(Ko) :한국지반공학회
Journal Title :Journal of the Korean Geotechnical Society
Journal Title(Ko) :한국지반공학회 논문집
Volume : 30
No :10
Pages :19-31
Received Date : 2014-03-21
Revised Date : 2014-08-26
Accepted Date : 2014-09-17
DOI :https://doi.org/10.7843/kgs.2014.30.10.19

Journal of the Korean Geotechnical Society ISSN:1229-2427(Print) 2288-646X(Online) 한국지반공학회 논문집

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