Characteristics of unsaturated soil slope covered with capillary barrier system and deep-rooted grass under different rainfall patterns

Rainfall-induced slope failures commonly occur in residual soil slopes. Slope failures are triggered by the reduction in soil strength. This is attributed to the decrease in soil suction due to rainwater infiltration. Slope covers like capillary barrier system and vegetative cover are effective meth...

Full description

Saved in:
Bibliographic Details
Main Authors: Li, Yangyang, Satyanaga, Alfrendo, Rahardjo, Harianto
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2021
Subjects:
Online Access:https://hdl.handle.net/10356/152940
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Nanyang Technological University
Language: English
id sg-ntu-dr.10356-152940
record_format dspace
spelling sg-ntu-dr.10356-1529402021-10-22T01:09:35Z Characteristics of unsaturated soil slope covered with capillary barrier system and deep-rooted grass under different rainfall patterns Li, Yangyang Satyanaga, Alfrendo Rahardjo, Harianto School of Civil and Environmental Engineering Engineering::Civil engineering Unsaturated Slope Stability Rainfall-induced slope failures commonly occur in residual soil slopes. Slope failures are triggered by the reduction in soil strength. This is attributed to the decrease in soil suction due to rainwater infiltration. Slope covers like capillary barrier system and vegetative cover are effective methods that can be used to prevent rainfall-induced slope failures. The capillary barrier system is able to limit the rainwater infiltration, and vegetation can contribute to the increase in soil strength. Vetiver grass is widely planted in tropical and subtropical areas of the world for soil and water conservation. This study investigates the characteristics of unsaturated soil slope covered with capillary barrier system and Vetiver grass in comparison with the original slope through numerical analyses and field measurements. The analyses were carried out under the advanced, normal, and delayed rainfall patterns. The results of the analyses indicated that the capillary barrier system played a more significant role than the Vetiver grass in maintaining slope stability, although both the capillary barrier system and Vetiver grass contributed to the slope stability. In addition, both numerical analyses and field measurements showed that under the delayed and normal rainfall patterns, when antecedent rainwater infiltration could increase the soil moisture, the capillary barrier system performed much better compared to Vetiver grass in maintaining soil matric suctions and slope stability. Housing & Development Board Published version This study was supported by the Housing and Development Board and Nanyang Technological University, Singapore. 2021-10-22T01:09:35Z 2021-10-22T01:09:35Z 2021 Journal Article Li, Y., Satyanaga, A. & Rahardjo, H. (2021). Characteristics of unsaturated soil slope covered with capillary barrier system and deep-rooted grass under different rainfall patterns. International Soil and Water Conservation Research, 9(3), 405-418. https://dx.doi.org/10.1016/j.iswcr.2021.03.004 2095-6339 https://hdl.handle.net/10356/152940 10.1016/j.iswcr.2021.03.004 2-s2.0-85106580406 3 9 405 418 en International Soil and Water Conservation Research © 2021 International Research and Training Center on Erosion and Sedimentation, China Water & Power Press. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Civil engineering
Unsaturated
Slope Stability
spellingShingle Engineering::Civil engineering
Unsaturated
Slope Stability
Li, Yangyang
Satyanaga, Alfrendo
Rahardjo, Harianto
Characteristics of unsaturated soil slope covered with capillary barrier system and deep-rooted grass under different rainfall patterns
description Rainfall-induced slope failures commonly occur in residual soil slopes. Slope failures are triggered by the reduction in soil strength. This is attributed to the decrease in soil suction due to rainwater infiltration. Slope covers like capillary barrier system and vegetative cover are effective methods that can be used to prevent rainfall-induced slope failures. The capillary barrier system is able to limit the rainwater infiltration, and vegetation can contribute to the increase in soil strength. Vetiver grass is widely planted in tropical and subtropical areas of the world for soil and water conservation. This study investigates the characteristics of unsaturated soil slope covered with capillary barrier system and Vetiver grass in comparison with the original slope through numerical analyses and field measurements. The analyses were carried out under the advanced, normal, and delayed rainfall patterns. The results of the analyses indicated that the capillary barrier system played a more significant role than the Vetiver grass in maintaining slope stability, although both the capillary barrier system and Vetiver grass contributed to the slope stability. In addition, both numerical analyses and field measurements showed that under the delayed and normal rainfall patterns, when antecedent rainwater infiltration could increase the soil moisture, the capillary barrier system performed much better compared to Vetiver grass in maintaining soil matric suctions and slope stability.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Li, Yangyang
Satyanaga, Alfrendo
Rahardjo, Harianto
format Article
author Li, Yangyang
Satyanaga, Alfrendo
Rahardjo, Harianto
author_sort Li, Yangyang
title Characteristics of unsaturated soil slope covered with capillary barrier system and deep-rooted grass under different rainfall patterns
title_short Characteristics of unsaturated soil slope covered with capillary barrier system and deep-rooted grass under different rainfall patterns
title_full Characteristics of unsaturated soil slope covered with capillary barrier system and deep-rooted grass under different rainfall patterns
title_fullStr Characteristics of unsaturated soil slope covered with capillary barrier system and deep-rooted grass under different rainfall patterns
title_full_unstemmed Characteristics of unsaturated soil slope covered with capillary barrier system and deep-rooted grass under different rainfall patterns
title_sort characteristics of unsaturated soil slope covered with capillary barrier system and deep-rooted grass under different rainfall patterns
publishDate 2021
url https://hdl.handle.net/10356/152940
_version_ 1715201522705367040