한국지반공학회논문집 (Journal of the Korean Geotechnical Society)

  • 제34권3호
  • /
  • Pages.5-12
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  • 2018
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  • 1229-2427(pISSN)
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  • 2288-646X(eISSN)
한국지반공학회 (Korean Geotechnical Society)
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부정류 유출 및 흡입시험에 대한 불포화 투수계수의 역해석

Back Analysis of Unsaturated Hydraulic Conductivities for Transient Water Release and Imbibitions Measurement

  • 오세붕 (영남대학교 건설시스템공학과) ;
  • 김도형 (영남대학교 건설시스템공학과) ;
  • 송영석 (한국지질자원연구원 지질환경연구본부)
  • Oh, Seboong (Dept. of Civil Eng., Yeungnam Univ.) ;
  • Kim, Do-Hyung (Dept. of Civil Eng., Yeungnam Univ.) ;
  • Song, Young-Sug (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources)
  • 투고 : 2017.10.24
  • 심사 : 2018.03.13
  • 발행 : 2018.03.31
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초록

불포화 투수계수 추정을 위하여 부정류 유출 및 흡입시험을 수행하였고 그 결과를 이용하여 역해석을 수행하였다. 부정류 수리특성을 이용하면 함수특성곡선 및 불포화투수계수를 정확하고 효율적으로 구할 수 있다. 본 연구에서 세가지 시료에 대한 실험을 세분화된 모관흡수력에 대하여 실행하고 시간에 따른 함수비의 변화를 정밀하게 측정하였다. 역해석과 실험결과를 비교한 결과, 시간에 따른 유량의 변화를 신뢰성 있게 계산할 수 있었다. 역해석의 해로 구한 함수특성곡선에서는 실험결과와 근사하게 나타났다. 불포화 투수계수곡선에서는 함수특성곡선으로부터 이론적으로 구한 곡선과 비교하였으나 역해석 결과와는 다소 차이를 보였다. 하지만 실험적 및 해석적 기법을 병행하여 획득한 불포화 수리적 거동이 실제거동에 부합된다고 판단된다.

Tests for transient water release and imbibitions measurement were conducted to estimate the unsaturated hydraulic conductivities by using back analysis. By using transient hydraulic characteristics, both the soil water retention curve and hydraulic conductivity fuction can be evaluated effectively and accurately. In this study the experiment for three samples were conducted accurately to measure the change of water content with time for various steps of matric suction. The back analysis calculated the amount of transient flow reliably in comparison with the experimental results. In the soil water retention curve there was no significant difference between the result of back analysis and that of experiment. The hydraulic conductivity function from back analysis was compared with the theoretical relation based on retention curve but they showed much difference. However, the unsaturated hydraulic behavior obtained by the combination of experimental and analytical techniques are considered to agree with the actual behavior.

키워드

참고문헌

  1. Campbell, J. D. (1973), Pore pressures and volume changes in unsaturated soils, Ph.D. Thesis, University of Illinois at Urbana- Champaign, Urbana-Champaign, IL.
  2. Fredlund, D. G., Xing, A., and Huang, S. (1994), "Predicting the Permeability Function for Unsaturated Soils Using the Soil-water Characteristic Curve", Canadian Geotechnical Journal, Vol.31, No.3, pp.533-546. https://doi.org/10.1139/t94-062
  3. Hydrus-1D, Department of environmental sciences, University of California riverside Simunek et al., 2013.
  4. Kunze, R. J., Uehara, G., and Graham, K. (1968), "Factors Important in the Calculation of Hydraulic Conductivity", Soil Science Society of America Proceedings, Vol.32, pp.760-765. https://doi.org/10.2136/sssaj1968.03615995003200060020x
  5. Mualem, Y. (1976), "A New Model for Predicting the Hydraulic Conductivity of Unsaturated Porous Media", Water Resources Research, Vol.12, pp.593-622.
  6. Peters, A. and Durner, W (2008), "A Simple Model for Describing Hydraulic Conductivity in Unsaturated Porous Media Accounting for Film and Capillary Flow", Water Resour. Res., Vol.44, doi:10.1029/2008WR007136.
  7. Peters, A., Durner, W., and Wessolek, G. (2011), "Consistent Parameter Constraints for Soil Hydraulic Functions", Adv. Water Resour., Vol.34, pp.1352-1365. https://doi.org/10.1016/j.advwatres.2011.07.006
  8. Oh, S., Kim, Y.K., and Kim, J.-W. (2015), "A Modified van Genuchten-Mualem Model of Hydraulic Conductivity in Korean Residual Soils", Water, 7, 5487-5502. https://doi.org/10.3390/w7105487
  9. Salas, J.D., Govindaraju, R., Anderson, M., Arabi, M., Frances, F., Suarez, W., Lavado, W., and Green, T.R. Introduction to Hydrology, In Handbook of Environmental Engineering, Volume 15: Modern Water Resources Engineering, Wang, L.K., Yang, C.T., Eds.; Humana Press-Springer Science: New York, NY, USA, 2014.
  10. Schaap, M.G. and Leij, F.J. (2000), "Improved Prediction of Unsaturated Hydraulic Conductivity with the Mualem-van Genuchten Model", Soil Sci. Soc. Am. J., Vol.64, pp.843-851. https://doi.org/10.2136/sssaj2000.643843x
  11. Song, Y.-S., Kim, K.-S., Jeong, S.-W., and Lee, V.-O. (2014), "Estimation on Unsaturated Characteristic Curves of Tailings obtained from Waste Dump of Imgi Mine in Busan", J. Korean Geotechnical Society, Vol.30, No.3, pp.47-58 (in Korean). https://doi.org/10.7843/KGS.2014.30.3.47
  12. van Genuchten, M. T. (1980) "A Closed-form Equation for Predicting the Hydraulic Conductivity of Unsaturated Soils," Soil Science Society of America Journal, Vol.44, pp.892-898. https://doi.org/10.2136/sssaj1980.03615995004400050002x
  13. Wayllace, A. and Lu, N. (2012), "A Transient Water Release and Imbibitions Method for Rapidly Measuring Wetting and Drying Soil Water Retention and Hydraulic Conductivity Functions", Geotechnical Testing Journal, Vol.35, No.1, pp.103-117.