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http://dx.doi.org/10.12652/Ksce.2015.35.5.1073

Influence of Antecedent Rainfall in Stability Analysis of Unsaturated Soil Slope  

Lee, Yeongsaeng (Kyonggi University)
Yoon, Seunghyun (Isan corporation)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.35, no.5, 2015 , pp. 1073-1082 More about this Journal
Abstract
The behavior of the unsaturated soil slope can be influenced by the various factors such as the hydraulic characteristics, the mechanical characteristics, the coefficient of conductivity, the stratifications, the rainfall conditions i.e. the rainfall intensity, the rainfall pattern, the duration time of the rainfall and the antecedent rainfall etc. It is known that the slope failure is influenced greatly by the antecedent rainfall rather than the rainfall condition at the failure time, so the antecedent rainfall is supposed to be a very important factor in slope stability analysis among these factors. To predict and to prevent the slope failure by the rainfall, the distribution of the matric suction by the antecedent rainfall must be considered first of all and the slope stability analysis should be carried out by considering the successive rainfall characteristics. In this research, 3 samples with different quantity (5%, 10%, 20%) of silts were prepared and the SWCC (Soil-water characteristic curve) tests were carried out and the associated parameters were analyzed. After analyzing the distribution of the matric suction and the change of the mechanical characteristics such as the stress and the strength when applying the antecedent rainfall for one month and the successive intensive rainfall for 12 hours, the slope stability analyses were carried out numerically. And the influence of the antecedent rainfall for one month and the SWCC on the stability of a slope were compared and analyzed.
Keywords
Antecedent rainfall; Soil-water characteristic curve; Saturated coefficient of permeability; Matric suction; Slope stability;
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Times Cited By KSCI : 4  (Citation Analysis)
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