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http://dx.doi.org/10.9720/kseg.2011.21.1.057

Three-dimensional Slope Stability Analysis of a Dual-lithology Slope  

Seo, Yong-Seok (Department of Earth and Environmental Sciences, Chungbuk National University)
Lee, Kyoung-Mi (Department of Earth and Environmental Sciences, Chungbuk National University)
Kim, Kwang-Yeom (Geotechnical Engineering and Tunnelling Research Div., Korea Institute of Construction Technology)
Publication Information
The Journal of Engineering Geology / v.21, no.1, 2011 , pp. 57-64 More about this Journal
Abstract
Three-dimensional slope stability analysis was applied to a failed dual-lithology slope containing both granite and an andesitic dyke, taking account of the differences in shear strength of the different lithologies. A direct shear test of the soil-rock boundary was performed to examine the shear strength of two different types of failure surfaces within different lithologies, and a laboratory test was performed on an upper, weathered soil layer. The test results indicate that shear strength was lower at the soil-rock boundary than within the weathered soil layer. A representative geological section was subjected to two-dimensional slope stability analysis using a limit equilibrium method to assess whether the distribution of lithologies upon the slope influences the results of stability analysis. The results were then compared with those of three-dimensional slope stability analysis, for which input parameters can be varied according to the distribution of lithologies upon the slope. The three-dimensional analysis yielded safety factors of 1.26 under dry conditions and 0.55 under wet conditions, whereas the two-dimensional analysis yielded unstable safety factors of 0.92 and 0.32, respectively. These findings show that the results of stability analysis are affected by the distribution of different lithologies upon the slope. Given that the studied slope collapsed immediately after rainfall, it is likely that the results of the three-dimensional analysis are more reliable.
Keywords
Soil-rock boundary; Direct shear test; Three-dimensional slope stability analysis; Two-dimensional slope stability analysis; Safety factor;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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