Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Analysis of Rainfall Induced Infiltration Considering Occluded Air in Unsaturated Soils

갇힌 공기를 고려한 불포화토 침투 해석에 관한 연구

  • 이준용 (한국건설기술연구원 Geo-인프라연구실) ;
  • 유찬 (경상대학교 지역환경기반공학과 (농업생명과학연구원)) ;
  • 김욱기 (한국건설기술연구원 Geo-인프라연구실) ;
  • 김동욱 (한국건설기술연구원 Geo-인프라연구실)
  • Received : 2012.07.26
  • Accepted : 2012.09.10
  • Published : 2012.09.30
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Abstract

Accurate modeling rainfall induced landslide and slope stability requires a detailed knowledge of the distribution of material strength characteristics and suction distribution. However, material properties obtained from the drying cycle are still used for infiltration analysis in many cases, even though material properties of wetting cycle are quite different from those of drying cycle due to hydraulic hysteresis and air occlusion. Therefore, the selection of proper material properties such as soil-water retention curve (SWRC) and the hydraulic conductivity function (HCF) reflecting characteristics of wetting cycle and air occlusion is an essential prerequisite in order to simulate the infiltration phenomena and to predict the suction and water content distribution in unsaturated soils. It is concluded that the simulation of infiltration with material properties from the drying cycle did not reasonably match with experimental outputs. Further discussion is made on how to describe the material properties considering air occlusion during wetting cycle over the entire suction range in order to simulate infiltration phenomena.

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