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http://dx.doi.org/10.7843/kgs.2018.34.5.37

Probabilistic Stability Analysis of Unsaturated Soil Slope under Rainfall Infiltration  

Cho, Sung-Eun (Dept. of Civil, Safety, and Environmental Engrg. & Construction Engrg. Research Institute, Hankyong National Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.34, no.5, 2018 , pp. 37-51 More about this Journal
Abstract
The slope failure due to the rainfall infiltration occurs frequently in Korea, since the depth of the weathered residual soil layer is shallow in mountainous region. Depth of the failure surface is shallow and tends to pass near the interface between impermeable bedrock and soil layer. Soil parameters that have a significant impact on the instability of unsaturated slopes due to rainfall infiltration inevitably include large uncertainties. Therefore, this study proposes a probabilistic analysis procedure by Monte Carlo Simulation which considers the hydraulic characteristics and strength characteristics of soil as random variables in order to predict slope failure due to rainfall infiltration. The Green-Ampt infiltration model was modified to reflect the boundary conditions on the slope surface according to the rainfall intensity and the boundary condition of the shallow impermeable bedrock was introduced to predict the stability of unsaturated soil slope with shallow bedrock under constant rainfall intensity. The results of infiltration analysis were used as inputs of infinite slope analysis to calculate the safety factor. The proposed analysis method can be used to calculate the time-dependent failure probability of soil slope due to rainfall infiltration.
Keywords
Green-Ampt model; Rainfall infiltration; Unsaturated soil; Monte Carlo Simulation;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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