부산대학교 도서관

Unsaturated geotechnical properties and other factors(rainfall characteristic, geomorphology, etc) have to be considered in order to evaluate the stability of real slope. Even though antecedent rainfall is also an important factor on the slope stability, it is rarely considered in analysis of slope stability. In this paper slope stability analysis for unsaturated weathered granite soil in Inje was conducted considering antecedent rainfall. Effect of antecedent rainfall was considered in analysis by using initial matric suction, which was induced from field measurement. Unsaturated geotechnical properties(soil-water characteristic curve, unsaturated conductivity, unsaturated shear strength) of weathered granite soil in Inje were also investigated. Effects of antecedent rainfall on variation of factor of safety(FS) of slope, failure time and cumulative rainfall were evaluated. For a slope with high initial matric suction, FS slowly decreased and failure time delayed than a slope with low initial matric suction. Numerical analysis also indicated that a slope with wetting SWCC more rapidly approached to failure than a slope with drying SWCC.