Proceedings of the Korean Geotechical Society Conference (한국지반공학회:학술대회논문집)

Korean Geotechnical Society (한국지반공학회)
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Stability of unsaturated infinite slope under rainfall-induced infiltration

강우침투시 불포화 무한사면의 안정성 평가

  • Song, Young-Suk (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Hwang, Woong-Ki (Department of Civil and Environmental Engineering, Korea Maritime University) ;
  • Lee, Nam-Woo (Department of Civil and Environmental Engineering, Korea Maritime University) ;
  • Kim, Tae-Hyung (Department of Civil Engineering, Korea Maritime University)
  • 송영석 (한국지질자원연구원 지구환경연구본부) ;
  • 황웅기 (한국해양대학교 토목환경공학과) ;
  • 이남우 (한국지질자원연구원 지구환경연구본부, 한국해양대학교 토목환경공학과) ;
  • 김태형 (한국해양대학교 토목공학과)
  • Published : 2010.09.09
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Abstract

The stability analysis of unsaturated infinite slope under rainfall-induced infiltration condition was performed using the generalized effective stress that unifies both saturated and unsaturated condition recently proposed by Lu and Likos(2004, 2006). The Soil-Water Characteristic Curve (SWCC) of the sand with the relative density of 75% was first measured for both drying and wetting processes. The Hydraulic Conductivity Function (HCF) and Suction Stress Characteristic Curve (SSCC) were subsequently estimated. Also, under the rainfall-induced infiltration condition transient seepage analysis of unsaturated infinite slope was performed using the finite element program, SEEP/W. Based on these results, the stability of unsaturated infinite slope under rainfall-induced infiltration condition was examined considering the suction stress. According to the results, the negative pore water pressure and water content within the soil changed with time due to the infiltration. Also, the variation of those caused the variation of suction stress and then the factor of safety of slope changed consequently during the rainfall period.

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