ANALYSIS OF EXTREME RAINFALL-INDUCED SLOPE FAILURE USING A RAINFALL INFILTRATION-INFINITE SLOPE ANALYSIS MODEL

Abstract

The aim of this paper is to propose the method for analyzing the slope response to rainfall
infiltration during the extreme rainfall in a mountainous area by combining Green -Ampt infiltration model
and infinite slope analysis model. The Green-Ampt infiltration model is used to calculate cumulative
infiltration into the soil slope. The infinite slope analysis model is chosen to represent the shallow soil slope
failure and the simplified first order second moment (SFOSM) is used to calculate the probability of failure.
The reliability of the proposed model is validated using three landslide history cases in southern Thailand.
Considering the result of calculation, it was found that the proposed model can be used the estimating the soil
slope failure occurrence time.