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http://dx.doi.org/10.7843/kgs.2009.25.1.65

Influence of Rainfall Intensity and Saturated Permeability on Slope Stability during Rainfall Infiltration  

Lee, Seung-Rae (Dept. of Civil and Environmental Engrg., KAIST)
Oh, Tae-Kyu (DAEWOO E&C Co. Ltd.)
Kim, Yun-Ki (Dept. of Civil and Environmental Engrg., KAIST)
Kim, Hee-Chul (DAEWOO E&C Co. Ltd.)
Publication Information
Journal of the Korean Geotechnical Society / v.25, no.1, 2009 , pp. 65-76 More about this Journal
Abstract
The unsaturated characteristics of Korean weathered granite soils have been studied to investigate the influence of saturated permeability, rainfall intensity and soil-water characteristic curve (SWCC) on the slope stability. The upper, average and lower SWCCs were estimated from the publication and experimental results using the statistical concept. The roughly estimated SWCC can be used for the soils without experimental results by relating SWCC with the particle size distribution curve. An appropriate ratio between the saturated permeability and the rainfall intensity ($k_s$/i) was also suggested for practical use in designing the slopes by investigating the time-dependent variation of slope instability during the rainfall. The slope stability was deteriorated from the initiation of rainfall and recovered again after the factor of safety reached the critical value. The FS of the slope decreased at first and then increased after reaching the critical value during the rainfall. As a result, the slope instability was not related with an absolute rainfall intensity but with the ratio between the saturated permeability and the rainfall intensity. In case of the upper SWCC, the critical condition occurred when the ratio between the saturated permeability and the rainfall intensity was in the range of $1.0{\sim}2.0$.
Keywords
Coefficient of permeability; Rainfall infiltration; SWCC; Slope stability; Unsaturated soils;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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