Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Effects of Capillary Force on Salt Cementation Phenomenon

소금의 고결화 현상에서 모세관 효과

  • Truong, Q. Hung (School of Civil, Environmental and Architectural Engrg., Korea Univ.) ;
  • Byun, Yong-Hoon (School of Civil, Environmental and Architectural Engrg., Korea Univ.) ;
  • Eom, Yong-Hun (Department of Tunnel Engrg., Dongmyeong Engrg. Consultant & Architecture) ;
  • Lee, Jong-Sub (School of Civil, Environmental and Architectural Engrg., Korea Univ.)
  • 쭝꽝훙 (고려대학교 건축.사회환경공학과) ;
  • 변용훈 (고려대학교 건축.사회환경공학과) ;
  • 엄용훈 (동명기술공단 터널부) ;
  • 이종섭 (고려대학교 건축.사회환경공학과)
  • Received : 2010.01.11
  • Accepted : 2010.04.23
  • Published : 2010.04.30
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Abstract

Salt cementation, a typical naturally-cemented phenomenon, may occur due to water evaporation under the change of climate. Capillary force may influence the distribution of cement in granular soils. This study addresses the effect of capillary force on salt cementation using five different techniques: cone penetration test, electrical conductivity measurement, photographic imaging technique, nondestructive imaging technique, and process monitoring by elastic wave. Glass beads modeling a particulate media was mixed with salt water and then dried in an oven to create the cementation condition. Experimental results show that salt cementation highly concentrates at the top of the small particle size specimens and at the middle or the bottom of the large particle specimens. The predicted capillary heights are similar to the locations of high salt concentration in the cemented specimens. Five suggested methods show that the behavior of salt-cemented granular media heavily depends on the capillary force.

기후변화로 인해 물의 증발량이 많은 지역의 지반에서는 자연적인 소금의 고결화 현상이 발생한다. 이러한 소금의 고결화 분포는 모래지반에서 모세관력에 영향을 받는다. 이 연구의 목적은 콘 관입시험, 전기전도율 측정, 사진 이미지 촬영, 비파괴 이미지 분석 그리고 탄성파에 의한 프로세스 모니터링을 이용하여 소금의 고결화 현상에 대한 모세관력의 효과를 관찰하는 것이다. 실험은 입상재료를 모형화한 글라스비즈를 소금물에 포화시킨 후, 오븐에 넣어 시료를 건조시킴으로써 고결화를 발생시켰다. 실험결과, 고결된 소금의 농도는 시료입경이 작은 경우 최상부에서 높았고, 시료입경이 큰 경우 중간 또는 하부에서 높았다. 고결된 시료에서 높은 소금농도의 위치는 해석적 방법으로 산정된 모세관 높이와 유사하였다. 본 연구에서 수행한 5가지 실험은 모세관력이 소금이 고결된 흙과 같은 입상재료의 거동에 중요한 영향을 끼치는 것을 보여준다.

Keywords

Acknowledgement

Supported by : 한국연구재단

References

  1. Abduljauwad, S. N., and Al-Amoudi, O. S. B. (1995), "Geotechnical behaviour of saline sabkha soils", Geotechnique, 45(3), 425-445. https://doi.org/10.1680/geot.1995.45.3.425
  2. Carman, P. C. (1941), Capillary rise and capillary movement of moisture in fine sands. Soil Science. 52(1), 1-14. https://doi.org/10.1097/00010694-194107000-00001
  3. Cho, G. C. and Santamarina, J. C. (2001), "Unsaturated particulate materials - particle-level studies", Journal of Geotechnical and Geoenvironmental Engineering, ASCE, 127(1), 84-96. https://doi.org/10.1061/(ASCE)1090-0241(2001)127:1(84)
  4. Consoli, N. C., Schnaid, F., and Milititsky, J. (1998), "Interpretation of plate load tests on residual soil site", Journal of Geotechnical and Geoenvironmental Engineering, ASCE, 124(9), 857-867. https://doi.org/10.1061/(ASCE)1090-0241(1998)124:9(857)
  5. Coop, M. R., and Atkinson, J. H. (1993), "The mechanics of cemented carbonate sands", Geotechnique, 43(1), 53-67. https://doi.org/10.1680/geot.1993.43.1.53
  6. Coop, M. R., and Willson, S. M. (2003), "Behavior of hydrocarbon reservoir sands and sandstones", Journal of Geotechnical and Geoenvironmental Engineering, ASCE, 129(11), 1010-1019. https://doi.org/10.1061/(ASCE)1090-0241(2003)129:11(1010)
  7. Cuccovillo, T., and Coop, M. R. (1999), "On the mechanics of structured sands", Geotechnique, 49(6), 741-760. https://doi.org/10.1680/geot.1999.49.6.741
  8. Fonseca, A. V. d., Fernandes, M. M., and Cardoso, A. S. (1997), "Interpretation of a footing load test on a saprolitic soil from granite", Geotechnique, 47(3), 633-651. https://doi.org/10.1680/geot.1997.47.3.633
  9. Ismael, N. F. (2001), "Axial Load Tests on Bored Piles and Pile Groups in Cemented Sands", Journal of Geotechnical and Geoenvironmental Engineering, ASCE, 127(9), 766-773. https://doi.org/10.1061/(ASCE)1090-0241(2001)127:9(766)
  10. Lee, I. M., Truong, Q. H., Kim, D. H., and Lee, J. S. (2009-a), "Discontinuity detection ahead of a tunnel face utilizing ultrasonic reflection: laboratory scale application", TUST, Elsevier. 24(2), 155-163.
  11. Lee, W. J., Shin, D. H., Yoon, H. K., and Lee, J. S. (2009-b), "Micro-cone penetrometer for more concise snbsurface layer detection", Geotechnical Testing Journal, ASTM, 32(4), doi: 10.1520/GTJ101712.
  12. Leroueil, S., and Vaughan, P. R (1990), ''The general and congruent effects of structure in natural soils and weak rocks", Geotechnique, 40(3), 467-488. https://doi.org/10.1680/geot.1990.40.3.467
  13. Mitchell, J. K. and Soga, K. (2005). Fundamentals of Soil Behavior-3rd edition, John Wiley & Sons. New York.
  14. Truong, Q. H., Eom, Y. H. and Lee, J. S. (2009), "Characteristics of elastic waves according to cementation of dissolved salt", Vadose Zone Journal, Soil Science Society of America. (Submitted).