Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/84525
Title: Governing failure mode of unsaturated soil slopes under rainwater infiltration
Authors: Huang, Wengui
Leong, Eng-Choon
Rahardjo, Harianto
Keywords: Unsaturated Soil Slopes
Rainwater Infiltration
Engineering::Civil engineering
Issue Date: 2016
Source: Huang, W., Leong, E.-C., & Rahardjo, H. (2016). Governing failure mode of unsaturated soil slopes under rainwater infiltration. E3S Web of Conferences, 9, 15008-. doi:10.1051/e3sconf/20160915008
Series/Report no.: E3S Web of Conferences
Abstract: Due to rainwater infiltration and loss of matric suction above the wetting font, both translational and rotational slips may occur in an unsaturated soil slope. It is useful to know which failure mode is more critical. The governing failure mode is likely to be affected by soil properties, slope geometry, depth of wetting front and contribution of matric suction to shear strength, which were investigated in this study. Specifically, upper bound limit analysis was adopted to develop stability charts based on rotational failure mechanism, and infinite slope model was used to develop stability charts based on translational failure mechanism. For a slope, the failure mechanism which gives the lower factor of safety is the governing failure mode. It was found that the failure mode of an unsaturated soil slope under rainfall is determined by parameter group c′/γHtanϕ′ for a given slope angle, depth of wetting front and contribution of matric suction to shear strength. With the increase in depth of wetting front and greater contribution of matric suction to shear strength, a slope is more prone to translational failure. Slopes with angle β = 45° are most vulnerable to translational failure, while gentler slopes (e.g. β = 15°) and steeper slopes (e.g. β = 75°) are more susceptible to rotational failure.
URI: https://hdl.handle.net/10356/84525
http://hdl.handle.net/10220/50115
DOI: http://dx.doi.org/10.1051/e3sconf/20160915008
Rights: © 2016 The Author(s) (published by EDP Sciences). This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles

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