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Published in: Bulletin of Engineering Geology and the Environment 3/2021

03-01-2021 | Review Paper

The critical curve for shallow saturated zone in soil slope under rainfall and its prediction for landslide characteristics

Authors: Jian He, Shuhong Wang, Huan Liu, Vantuan Nguyen, Wenshuai Han

Published in: Bulletin of Engineering Geology and the Environment | Issue 3/2021

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Abstract

Rainfall is one of the most significant natural factors for inducing landslides. The shallow saturated zone formed in slopes during rainfall is an important factor in inducing shallow landslides. In this paper, the characteristics and influencing factors of the saturated zone in soil slopes, and the relationship between the soil surface permeability coefficient and the rainfall intensity are analyzed. In this research, the equation that characterizes the rainfall intensity by the soil saturation is built based on the Mualem-van Genuchten model, which mathematically describes the soil water characteristics of unsaturated soils. Using this model, the target saturation of the slope surface during rainfall can be determined accurately, with an average deviation of − 0.008. Based on the equations, the innovative critical curve model of the rainfall intensity−time required to form the shallow saturated zone is established and calculated. The influence of the soil material, slope angle, rainfall intensity and antecedent rainfall on the critical curve for the shallow saturated zone is analyzed. The results indicate that for slopes of 30°~40°, it is easy for the shallow saturated zone to form, and the previous rainfall after more than 16 days has little impact on the critical curve. Furthermore, an innovative landslide prediction model, based on the critical curve for the shallow saturated zone and I-D modeling, is proposed to provide benchmarks for the prediction-specific characteristics of deep or shallow landslides, which is verified by the case of the Madiwan landslide.

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Metadata
Title
The critical curve for shallow saturated zone in soil slope under rainfall and its prediction for landslide characteristics
Authors
Jian He
Shuhong Wang
Huan Liu
Vantuan Nguyen
Wenshuai Han
Publication date
03-01-2021
Publisher
Springer Berlin Heidelberg
Published in
Bulletin of Engineering Geology and the Environment / Issue 3/2021
Print ISSN: 1435-9529
Electronic ISSN: 1435-9537
DOI
https://doi.org/10.1007/s10064-020-02016-1

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