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http://dx.doi.org/10.7843/kgs.2007.23.3.101

Effect of Fines on the Stability of Unsaturated Soil Slopes  

Lee, Kyu-Hyun (Civil Research & Eng. Team, Technology Research Institute, Daelim Industrial Co., Ltd.)
Jeong, Sang-Seom (Dept. of Civil Eng., Yonsei Univ.)
Kim, Tae-Hyung (Dept. of Civil Eng., Yonsei Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.23, no.3, 2007 , pp. 101-109 More about this Journal
Abstract
In South Korea, many weathered soil slopes are composed of soil mixtures with certain amount of clay fractions in natural soil deposits. Accordingly, it is very important to analyze that effect of the fines on the stability of unsaturated soil slopes. In this study, five different soil types classified by mixture portion of fines were used and experiment on the soil-water characteristic curve tests (SWCC) using GCTS (Geotechnical Consulting and Testing Systems) pressure plate were performed in order to analyze the stability of unsaturated soil slopes. Based on the infiltration analysis which contains SWCC test result by the SEEP/W, it is shown that the increasing rate of the wetting band depth was decreased as the fines content and the relative density were increased. According to the stability analysis result of the unsaturated soil slopes through the SLOPE/W, it is found that the transition from the wetting band depth to the variation of strength parameters which affect the stability of unsaturated soil slopes appears to occur around $10\sim15%$ of clay contents in the mixtures.
Keywords
GCTS pressure plate; Infiltration analysis; Strength parameters; SWCC; Wetting band depth;
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