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Most landslides in Korea are classified as shallow landslides with anaverage depth of less than 2 m. These shallow landslides are associated withthe advance of a wetting front in the unsaturated soil due to rainfallinfiltration, which results in an increase in water content and a reductionin the matric suction in the soil. Therefore, this study presents a modifiedequation of infinite slope stability analysis based on the concept of thesaturation depth ratio to analyze the slope stability change associated withthe rainfall on a slope. A rainfall infiltration test in unsaturated soilwas performed using a column to develop an understanding of the effect ofthe saturation depth ratio following rainfall infiltration. The resultsindicated that the rainfall infiltration velocity due to the increase inrainfall in the soil layer was faster when the rainfall intensity increased.In addition, the rainfall infiltration velocity tends to decrease withincreases in the unit weight of soil. The proposed model was applied toassess its feasibility and to develop a regional landslide susceptibilitymap using a geographic information system (GIS). For that purpose, spatialdatabases for input parameters were constructed and landslidelocations were obtained. In order to validate the proposed approach, theresults of the proposed approach were compared with the landslide inventoryusing a ROC (receiver operating characteristics) graph. In addition, theresults of the proposed approach were compared with the previous approachused: a steady-state hydrological model. Consequently, the approach proposed inthis study displayed satisfactory performance in classifying landslidesusceptibility and showed better performance than the steady-state approach

A method for predicting the factor of safety of an infinite slope based on the depth ratio of the wetting front induced by rainfall infiltration