선행강우패턴을 고려한 화강풍화토 비탈면의 안정성 평가

Rainfall infiltration is one of the main causes in slope failure. It leads unstable condition of a slope because of increase of soil unit weight, strength reduction, variation of groundwater level etc. Generally the way how to set up a boundary condition of rainfall infiltration is very important to analyze slope stability. In Korea, engineers use IDF curve to set up a boundary condition of rainfall infiltration. It means constant rainfall intensity to be applied in a certain period. But, there is a rare case to consider rainfall patterns and antecedent rainfall. In this study, variations of slope stability under various rainfall patterns and effective rainfall concept are executed by numerical analysis. Factor of safety is affected by boundary conditions of rainfall infiltration and antecedent rainfall by effective rainfall. It is judged that regional rainfall condition and effective rainfall should be considered in slope stability analysis.