한국지반공학회논문집 (Journal of the Korean Geotechnical Society)

  • 제33권6호
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  • Pages.37-48
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  • 2017
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  • 1229-2427(pISSN)
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  • 2288-646X(eISSN)
한국지반공학회 (Korean Geotechnical Society)
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불포화지반의 습윤과정 함수특성곡선 추정을 위한 간편법

A Simple Method for Estimating Wetting Path of Soil Water Characteristic Curve on Unsaturated Soils

  • 박현수 (단국대학교 토목환경공학과) ;
  • 김병수 (오카야마 국립대학교) ;
  • 박성완 (단국대학교 토목환경공학과)
  • Park, Hyun-Su (Dept. of Civil & Environment Eng., Dankook Univ.) ;
  • Kim, Byeong-Su (Graduate School of Environment & Life Science, Okayama Univ.) ;
  • Park, Seong-Wan (Dept. of Civil & Environment Eng., Dankook Univ.)
  • 투고 : 2017.05.19
  • 심사 : 2017.06.14
  • 발행 : 2017.06.30
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초록

불포화 지반의 전단강도와 투수계수 산정에 이용되는 함수특성곡선은 건조과정과 습윤과정으로 나뉘며, 동일한 체적함수비에서 다른 흡수력을 나타내는 이력현상을 보인다. 강우 침투시 불포화 지반의 현장 거동은 습윤과정에 가깝게 발생하므로 수치해석 시에 습윤과정이 적용되어야 한다. 하지만 습윤과정이 건조과정보다 습득하는 시간이 오래 걸리기 때문에 주로 건조곡선이 사용되고 있다. 이를 보완하기 위해 건조곡선으로 습윤곡선을 추정하는 방법이 연구되어 왔으나, 방법이 복잡하고 잘 맞지 않는다. 따라서, 본 연구에서는 기존 자료를 바탕으로 습윤곡선 추정이 가능한 간편법을 제안하고 적용성을 검토하였다.

Soil-water characteristic curve (SWCC) has been widely used to estimate the shear strength and coefficient of permeability for unsaturated soils. In general, it is divided into the drying path in which the water is discharged and the wetting path in which the water is permeated, and it has a hysteresis indicating different suctions at the same volumetric water content. In reality the field behavior of unsaturated soils is much closer to the wetting path during the infiltration. The drying path has been practically used for various analyses because obtaining the wetting path takes longer than the drying path. Although many approaches for estimating wetting path have been studied till now, these are complex and do not fit well. Therefore, a simple method for estimating wetting path based on empirical approach in this study is proposed in unsaturated soils, and a feasibility study is conducted as well.

키워드

참고문헌

  1. Arya, L.M. and Paris, J.F. (1981), "A Physicoempirical Model to Predict the Soil Moisture Characteristic from Particle-size Distribution and Bulk Density Data", Soil Science Society of America Journal, Vol.45, No.6, pp.1023-1030. https://doi.org/10.2136/sssaj1981.03615995004500060004x
  2. Arya, L.M., Leij, F.J., van Genuchten, M.T., and Shouse, P.J. (1999), "Scaling Parameter to Predict the Soil Water Characteristic from Particle-size Distribution Data", Soil Science Society of America Journal, Vol.63, No.3, pp.510-519. https://doi.org/10.2136/sssaj1999.03615995006300030013x
  3. Barbour, S.L. (1998), "Nineteenth Canadian Geotechnical Colloquium: the Soil-water Characteristic Curve: A Historical Perspective", Canadian Geotechnical Journal, Vol.35, No.5, pp.873-894. https://doi.org/10.1139/t98-040
  4. Cui, Y.J., Tang, A.M., Mantho, A.M., and De Laure, E. (2008), "Monitoring Field Soil Suction Using a Miniature Tensiometer", Geotechnical Testing Journal, Vol.31, No.1, pp.95-100.
  5. Feng, M. and Fredlund, D.G. (1999), "Hysteretic Influence Associated with Thermal Conductivity Sensor Measurements", In Proceedings from Theory to the Practice of Unsaturated Soil Mechanics in Association with the 52nd Canadian Geotechnical Conference and the Unsaturated Soil Group, Regina, Sask., 23-24 October 1999, pp.14:2:14-14:2:20.
  6. Fredlund, D.G. and Rahardjo, H. (1993), "An Overview of Unsaturated Soil Behavior", Proceeding of the 1993 ASCE Convention on Unsaturated Soils, Dallas, Texas,pp. 1-31.
  7. Gallage, C.P.K. and Uchimura, T. (2010), "Effects of Dry Density and Grain Size Distribution on Soil-water Characteristic Curves of Sandy Soils", Soil Foundations, Vol.50, No.1, pp.161-172. https://doi.org/10.3208/sandf.50.161
  8. Gupta, S.C. and Larson, W.E. (1979), "Estimating Soil Water Retention Characteristics from Particle Size Distribution, Organic Matter Percent, and Bulk Density", Water Resources Research, Vol.15, No.6, pp.1633-1635. https://doi.org/10.1029/WR015i006p01633
  9. Johari, A., Habibagahi, G., and Ghahramani, A. (2006), "Prediction of Soil-water Characteristic Curve Using Genetic Programming", Journal of Geotechnical and Geoenvironmental Engineering, Vol. 132, No.5, pp.661-665. https://doi.org/10.1061/(ASCE)1090-0241(2006)132:5(661)
  10. Klausner, Y. (1991), "Fundamentals of Continuum Mechanics of Soils", Springer-Verlag, New York.
  11. Koekkoek, E.J.W. and Booltink, H. (1999), "Neural Network Models to Predict Soil Water Retention", European Journal of Soil Science, Vol.50, No.3, pp.489-495. https://doi.org/10.1046/j.1365-2389.1999.00247.x
  12. Lee, I. M., Cho, W. S., Kim, Y. U., and Sung, S. G. (2003), "In-situ Monitoring of Matric Suctions in a Weathered Soil Slope", Journal of the Korean Geotechnical Society, Vol.19, No.1, pp.41-49 (in Korean with English abstract).
  13. Ministry of Science, ICT and Future Planning of Korea (2015), "Establishing D/B on Retention Characteristics and Stess State of Soil Slopes during Extreme Rainfall" (in Korean).
  14. Mualem, Y. (1974), "A Conceptual Model of Hysteresis", Water Resources Research, Vol.10, No.3, pp.514-520. https://doi.org/10.1029/WR010i003p00514
  15. Pachepsky, Ya. A., Timlin, D., and Varallyay, G. (1996), "Artificial Neural Network to Estimate Soil Water Retention from Easily Measurable Data", Soil Science Society of America Journal, Vol.60, No.3, pp.727-733. https://doi.org/10.2136/sssaj1996.03615995006000030007x
  16. Park, S.W., Kang, B.S., Song, P.H., Kim, H.K., and Kim, J.S. (2014), "Development of a Design Criteria on Slope Drainage of Highway Considering Weather Conditions", Technical Report, Korea Highway Corp., Korea (in Korean).
  17. Park, S.W., Park, J.Y., Tae, D.H., and Sim, Y.J. (2010), "Effects of Overburden Pressure and Clay Content on Water Retention Characteristics of Unsaturated Weathered Soils", KSCE Journal of Civil Engineering, Vol.30, No.1, pp.53-63 (in Korean with English abstract).
  18. Park, H.S., Song, Y.S., and Park, S.W. (2017), "Predicted Hydraulic Behavior in In-Situ Soil Slope Using the Path-Dependent Soil Water Characteristic Curve", Journal of the Korean Geotechnical Soiciety, Vol.33, No.4, pp.25-34 (in Korean with English abstract).
  19. Pham, Q.H., Fredlund, D.G., and Barbour, S.L. (2005), "A Study of Hysteresis Models for Soil-water Characteristic Curves", Canadian Geotechnical of Journal, Vol.42, No.6, pp.1548-1568. https://doi.org/10.1139/t05-071
  20. Saxton, K.E., Rawls, W.J., Romberger, J.S., and Papendick, R.I. (1986), "Estimating Generalized Soil Water Characteristics from Texture", Soil Science of America Journal, Vol.50, No.4, pp. 1031-1036. https://doi.org/10.2136/sssaj1986.03615995005000040039x
  21. Scheinost, A.C., Sinowski, W., and Auerswald, K. (1997), "Reginalization of Soil Water Retention Curves in a Highly Variable Soilscape, I. Developing a New Pedotransfer Function", Geodema, Vol.78, No.3, pp.129-143. https://doi.org/10.1016/S0016-7061(97)00046-3
  22. Song, Y.S., Chae, B.G., and Lee, J.T. (2016), "A Method for Evaluating the Slope Stability of an Unsaturated Slope in Natural Terrain during Rainfall", Engineering Geology, Vol.210, pp.84-92. https://doi.org/10.1016/j.enggeo.2016.06.007
  23. Song, Y.S., Kim, K.S., Jeong, S.W., and Lee, C.O. (2014), "Estimation on Unsaturated Characteristics Curves of Tailings Obtained from Waste Dump of Imgi Mine in Busan", Journal of the Korean Geotechnical Society, Vol.30, No.3, pp.47-58 (in Korean with English abstract). https://doi.org/10.7843/KGS.2014.30.3.47
  24. Tyler, S.W. and Wheatcraft, S.W. (1989), "Application of Fractal Mathematics to Soil Water Retention Estimation", Soil Science Society of America Journal, Vol.53, No.4, pp.987-996. https://doi.org/10.2136/sssaj1989.03615995005300040001x
  25. Vereecken, H., Maes, J., Feyen, J., and Darius, P. (1989), "Estimating the Soil Moisture Retention Characteristic from Texture, Bulk Density, and Carbon Content", Soil Science, Vol.148, No.6, pp.389-403. https://doi.org/10.1097/00010694-198912000-00001

피인용 문헌

  1. Critical Continuous Rainfall Map for Forecasting Shallow Landslide Initiations in Busan, Korea vol.12, pp.9, 2017, https://doi.org/10.3390/w12092404