Browse > Article
http://dx.doi.org/10.7843/kgs.2012.28.9.23

Slope Stability Analysis of Unsaturated Soil in Debris-Flow Occurrence Slopes  

Kwak, Cheol-Soo (Dept. of Civil Engrg., Kangwon National Univ.)
Park, Byung-Soo (Dept. of Civil Engrg., Gangwon Provincial College)
Yoo, Nam-Jae (Dept. of Civil Engrg., Kangwon National Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.28, no.9, 2012 , pp. 23-30 More about this Journal
Abstract
This paper is research results of slope stability analysis associated with seepage infiltration for unsaturated soil in debris-flow occurrence slopes. Site investigations were carried out in two slopes, located at Inje in Kangwon province where debris flow occurred in 2006 and at Yangpyung in Kyeunggi province where it occurred in 2010. For unsaturated soil sampled at the zone of debris-flow initiation, soil water characteristic curves with tempe pressure cells and shear strength parameters with newly designed shear strength apparatus were obtained respectively. The commertially available software SEEP/W was used to analyze seepage infiltration in unsaturated soil, based on their properties obtained from test results and the actual rainfall data at the moment of debris flow occurrence, and slope stability analysis with the program of SLOPE/W, associated with results of seepage analysis, was performed to simulate slope failure. As results of this research, seepage infiltration to unsaturated soil due to intensive rainfall was found to cause increase of ground water table as well as degree of saturation. Through this research slope stability analysis for unsaturated soil, considering the actual rainfall characteristic, might be a reasonable method of investigating characteristics of debris flow behavior, in particular, the moment of debris flow occurrence.
Keywords
Unsaturated soils; Soil water characteristic curve; Shear strength; Direct shear test apparatus; Slope stability;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 Fredlund, D. G. and Xing, A. (1994), "Equations for the soil-water characteristic curve", Canadian Geotechnical Journal, Vol.31, No.4, pp.521-532.   DOI   ScienceOn
2 Fredlund, D. G. (2005), "Unsaturated soil mechanics in engineering practice", Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol.132, No3, pp.286-321.
3 Fredlund, D. G., Morgenstern, N. R., and Widger, R. A. (1978), "The shear strength of unsaturated soils", Can. Geothch. Journal, Vol.15, No.2, pp.261-276.
4 Jeong, S. S., Choi, J. Y., and Lee, J. H. (2009), "Stability analysis of unsaturated weathered soil slopes considering rainfall duration", Journal of KSCE, Vol.29, No.1C, pp.1-9.   과학기술학회마을
5 Kim, J. H., Park, S. W., Jeong, S. S., and Yoo, J. H. (2002), "A study of stability analysis on unsaturated weathered slopes based on rainfall-induced wetting", Journal of KGS, Vol.18, No.2, pp.123-136.   과학기술학회마을
6 Kim, M. W. and Kim, Y. M. (2010), "Shear strength of weathered granite soil considering change of saturation", Journal of Korean Geo-Environmental Society(KGES), Vol.11, No.9, pp.5-14.
7 Kim, S. K. and Ryu, C. H. (2000), "Shear strength of unsaturated decomposed soils", Journal of Korea Society of Civil Engineers (KSCE), Vol.20, No.2C, pp.109-118.   과학기술학회마을
8 Kwak, C. S., Yoo, K. S., Park, B. S., and Yoo, N. J. (2011), "Development of unsaturated direct shear testing apparatus", Proceedings of Korean Geotechnical Society(KGS) Fall National Conference, KGS, pp.266-274.
9 Lee, H. K. and Lee, I. (2009), "A study of unsaturated-character of weathered granite soil in korea", Journal of KGES, Vol.10, No.3, pp.13-20.
10 Oh, S. B., Mun, J. H., Kim, T. K., and Kim, Y. K. (2008), "A case study of rainfall-induced slope failures on the effect of unsaturated soil characteristics", Journal of KSCE, Vol.28, No.3C, pp.167-178.   과학기술학회마을
11 Park, S. W. and Shin, G. H. (2009), "Stability analysis on unsaturated gneiss weathered soil slopes considering wetting path soil-water characteristic curve", Journal of KSCE, Vol.29, No.5C, pp.191-198.   과학기술학회마을
12 Shin, G. H. and Park, S. W. (2006), "Effect of hysteresis on soilwater characteristic curve in weathered granite and gneiss soil slopes during rainfall infiltration", Journal of KGS, Vol.22, No.7, pp.55-64.
13 Yune, C. Y. and Jun, K. J. (2010), "Seepage analysis on Ground water level changes for the site of debris-flow", Proceedings of KGES, pp.272-280.