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http://dx.doi.org/10.9720/kseg.2014.1.1

Numerical Study of Unsaturated Infinite Slope Stability regarding Suction Stress under Rainfall-induced Infiltration Conditions  

Song, Young-Suk (Korea Institute of Geoscience and Mineral Resources, Geological Hazards Department)
Hwang, Woong-Ki (Korea Maritime and Ocean University, Department of Civil Engineering)
Publication Information
The Journal of Engineering Geology / v.24, no.1, 2014 , pp. 1-8 More about this Journal
Abstract
Numerical stability analysis of an unsaturated infinite slope under rainfall-induced infiltration conditions was performed using generalized effective stress to unify both saturated and unsaturated conditions The soil-water characteristic curve (SWCC) of sand with a relative density of 75% was initially measured for both drying and wetting processes. The hydraulic conductivity function (HCF) and suction stress characteristic curve (SSCC) were subsequently estimated. Under the rainfall-induced infiltration conditions, transient seepage analysis of an unsaturated infinite slope was performed using the finite element analysis program, SEEP/W. Based on these results, the stability of an unsaturated infinite slope under rainfall-induced infiltration conditions was examined in relation to suction stress. According to the results, the negative pore-water pressure and water content within the slope soil changed over time due to the infiltration. In addition, the variation of the negative pore-water pressure and water content led to a variation in suction stress and a subsequent change in the slope's factor of safety during the rainfall period.
Keywords
Unsaturated infinite slope; Rainfall-induced infiltration; Transient seepage analysis; Suction stress; Factor of safety;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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