Journal of the Korean GEO-environmental Society (한국지반환경공학회 논문집)

Korean Geo-Environmental Society (한국지반환경공학회)
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Unsaturated Soil-Water Characteristics Curve with Silt Contents for Nak-Dong River Sand

실트함유율에 따른 낙동강 모래의 불포화 함수특성곡선

  • 문홍득 (경남과학기술대학교 건설환경공과대학 토목공학과) ;
  • 김대만 (경남과학기술대학교 건설환경공과대학 토목공학과)
  • Received : 2010.11.09
  • Accepted : 2010.12.10
  • Published : 2011.02.01
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Abstract

In this paper, we got soil-water characteristic curve(SWCC) of Nak-Dong River's sand respectively as relative density 40%, 60%, 80% and content of silt 0%, 10%, 20%, 30%. As a result, the more the sand densify in the same silt content and the more the sand has silt in the same relative density, the change of volume water content was decreased. we have known effect of silt contents for SWCC and verified existing empirical formula of SWCC. As experiment results of soil-water characteristic curves compared to the empirical solutions, the results of van Genuchten(1980) and Fredlund & Xing(1994) were well-matched showing S type curves with experiment results. Especially the empirical solution of Fredlund & Xing showed almost same results of the coefficient of correlation($R^2$) equal to 0.99.

본 연구에서는 낙동강 모래를 상대밀도 40%, 60%, 80%, 실트 함유율 0%, 10%, 20%, 30%에 대한 함수특성곡선을 구하였다. 시험결과, 동일 실트함유율에 대해서는 상대밀도가 커질수록 그리고 동일 상대밀도에서는 실트함유율이 커질수록 체적함수비의 변화가 작게 나타났다. 기존의 경험식을 통해 구한 함수특성곡선과 시험에서 구한 결과를 비교하여 보면, van Genuchten(1980), Fredlund와 Xing(1994) 경험식에 의한 함수특성곡선은 시험결과의 경향과 비슷한 S자형 곡선을 나타내어 비교적 시험결과와 잘 부합하였다. 특히 Fredlund와 Xing 경험식의 경우 상관계수($R^2$)가 모두 0.99로 나와 거의 일치하는 결과를 보였다.

Keywords

Acknowledgement

Supported by : 진주산업대학교

References

  1. Annual Book of ASTM Standards(2007), Section Four Construction, Soil and Rock(I-1) D420-D5611, Vol. 04.08, pp. 518-541.
  2. Brooks, R. H. and Corey, A. T.(1964), Hydraulic Properties of Porous Medium, Colorado State Univ., Hydrology Paper, No. 3, 27 p.
  3. Fredlund, D. G. and A. Xing(1994), Equation for the Soil-water Characteristic Curve, Canadian Geotechnical Journal, Vol. 31, No. 3, pp. 521-532. https://doi.org/10.1139/t94-061
  4. Fredlund, D. G. and Rahardjo, H.(1993), Soil Mechanics for Unsaturated Soils, John Wiley & Sons Inc., NY, pp. 64-123.
  5. Gardner W. R.(1958), Some Steady State Solutions of the Unsaturated Moisture Flow Equation with Application to Evaporation from a Water Table, Soil Science Society of America Journal, Vol. 85, Issue 4, pp. 228-232.
  6. Japanese Industrial Standards(2000), Japanese Geotechnical Society, Division A(Civil Engineering and Architecture), p. 1224.
  7. MaKee, C. R., and Bumb, A. C.(1984), Flow-testing Coalbed Methane Production Wells in Presence of Water and Gas, SPE Formation Evaluation, Dec., pp. 599-608.
  8. van Genuchten, M. Th.(1980), A Closed-form Equation of Predicting the Hydraulic Conductivity of Unsaturated Soils, Soil Science Society of America Journal, Vol. 44, No. 5, pp. 892- 898. https://doi.org/10.2136/sssaj1980.03615995004400050002x
  9. Williams, J., Prebble, R. E., Williams, W. T. and Hignett, C. T.(1983), The Influence of Texture, Structure and Clay Mineralogy on the Soil Moisture Characteristic. Australian Journal of Soil Research, Vol. 21, No. 1, pp. 15-31. https://doi.org/10.1071/SR9830015
  10. Young, J. F.(1967), Humidity Control in the Laboratory using Salt Solutions-a Review, Journal of application Chemistry, Vol. 17, Issue 9, pp. 241-245.