Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
권호 표지
DOI QR코드

DOI QR Code

The Analysis of Permeability Coefficient and the Evaluation of Equations of Permeability Coefficient for an Unsaturated Soils

불포화토의 투수계수분석 및 투수계수 방정식의 적용성 평가

  • Lim, Seong-Yoon (Structure & Geotechnical Research Division Expressway & Transportation Technology Institute) ;
  • Lyu, Tae-Jin (Structure & Geotechnical Research Division Expressway & Transportation Technology Institute)
  • 임성윤 (한국도로공사 도로교통기술원) ;
  • 류태진 (한국도로공사 도로교통기술원)
  • Published : 2008.01.31
Download PDF
⟨ Previous Next ⟩

Abstract

The coefficient of permeability for a soil can be determined by the direct or the indirect method. The direct method of permeability can be performed either in the laboratory or in the field. The indirect method can be predicted from the soil-water characteristic curve. In this study, the coefficient of permeability for an unsaturated soil was determined by the modified apparatus of steady-state method (Klute, 1972) and was predicted from the equations of Brooks & Corey (1964) and van Genuchten (1980). The experimental results were compared with predicted coefficient of permeability and the applicability of the two equations (from Brooks & Corey, van Genuchten) was reviewed.

불포화토의 투수특성을 규명하기 위하여 3가지의 시료를 선정하고 흙수분 특성 시험을 선행한 후, 흡인력을 조절하면서 일련의 투수계수시험을 수행하였다. 공시체는 불교란 시료를 사용하여 자연 상태로 제작하였으며, 정수위 투수시험법을 이용하여 투수계수를 측정하였다. 아울러, 흙수분 특성곡선에서 도출된 계수를 이용하여 Brooks and Corey(1964)와 van Genuchten(1980)의 제안식으로 투수계수를 예측하였고, 이를 시험에 의한 투수계수와 비교 및 검토하여 기존 제안식의 적용성을 검토하였다.

Keywords

References

  1. 류지협 (2000), "불포화 풍화토의 투수특성 측정", 한국수자원학회논문집, 33(1), pp.133-142
  2. 송창섭 . 김명환 (2003), "불포화토의 흙-수분 특성곡선에 관한 실험적 고찰", 한국농공학회지, 45(1), pp.153-151
  3. 신은철 . 이학주 . 오영인 (2004), "불포화 준설매립 지반의 흙-수분 특성곡선 및 불포화 투수계수 예측", 한국지반공학회논문집, 20(1), pp.109-120
  4. 황창수 . 김태형 (2004), "불포화 투수계수함수에 대한 연구", 한국지반공학회논문집, 20(3), pp.47-51
  5. Brooks, R. H. and A. T. Corey (1964), "Hydraulic Properties of Porous Media", Colorado State University Hydrology Paper, 3, pp.1-27
  6. Fredlund, D. G. and H. Rahardjo (1993), Soil Mechanics for Unsaturated Soils, John Wiley & Sons, Inc., pp.14-149
  7. Fredlund, D. G. and A. Xing (1994), "Equation for the soil-water characteristic curve", Canadian Geotechnical Journal, 31(3), pp. 521-532 https://doi.org/10.1139/t94-061
  8. Fredlund, D. G., A. Xing and S. Huang (1994), "Predicting the permeability function for unsaturated soils using the soil-water characteristic curve", Canadian Geotechnical Journal, 31(3), pp. 533-546 https://doi.org/10.1139/t94-062
  9. Klute, A. (1965), "Laboratory Measurement of Hydraulic Conductivity of Unsaturated Soil", American Society of Agronomy, pp.253-261
  10. Klute, A. (1972), "The Determination of The Hydraulic Conductivity and Diffusivity of Unsaturated Soil", Colorado State University and USDA-ARS-SWCRD, pp.264-276
  11. van Genuchten, M. TH. (1980), "A closed-form equation for predicting the hydraulic conductivity of unsaturated soils", Soil Science Society of America Journal, 44, pp.982-898