Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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A Simple Method for Estimating Wetting Path of Soil Water Characteristic Curve on Unsaturated Soils

불포화지반의 습윤과정 함수특성곡선 추정을 위한 간편법

  • 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.)
  • 박현수 (단국대학교 토목환경공학과) ;
  • 김병수 (오카야마 국립대학교) ;
  • 박성완 (단국대학교 토목환경공학과)
  • Received : 2017.05.19
  • Accepted : 2017.06.14
  • Published : 2017.06.30
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Abstract

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.

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.

Keywords

References

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