Journal Title
Title of Journal: Environ Geol
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Abbravation: Environmental Geology
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Publisher
Springer Berlin Heidelberg
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Authors: Agus Setyo Muntohar HungJiun Liao
Publish Date: 2008/02/07
Volume: 56, Issue: 6, Pages: 1145-1159
Abstract
Rainwater infiltration during typhoons tends to trigger slope instability This paper presents the results of a study on slope response to rainwater infiltration during heavy rainfall in a mountain area of Taiwan The GreenAmpt infiltration model is adopted here to study the behavior of rainwater infiltration on slopes The failure mechanism of infinite slope is chosen to represent the rainfallinduced shallow slope failure By combining rain infiltration model and infinite slope analysis the proposed model can estimate the occurrence time of a slope failure In general if a slope failure is to happen on a slope covered with low permeability soil failure tends to happen after the occurrence of the maximum Rainfall Intensity In contrast slope failure tends to occur prior to the occurrence of maximum Rainfall Intensity if a slope is covered with highpermeability soil To predict the potential and timing of a landslide a method is proposed here based on the normalized Rainfall Intensity NRI and normalized accumulated rainfall NAR If the actual NAR is higher than the NAR calculated by the proposed method slope failure is very likely to happen Otherwise the slope is unlikely to fail The applicability of the proposed model to occurrence time and the NAR–NRI relationship is evaluated using landslide cases obtained from the literature The results of the proposed method are close to that of the selected cases It verifies the applicability of the proposed method to slopes in different areas of the world
Keywords:
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