Effects of unsaturated properties on stability of slope covered with Caesalpinia crista in Singapore

Rainfall plays an important role in affecting the slope stability in a tropical country such as Singapore. The soil in Singapore is mainly residual soil with a deep groundwater table that is commonly found in the unsaturated condition in the presence of matric suction. This paper presents the unsatu...

Full description

Saved in:
Bibliographic Details
Main Authors: Rahardjo, Harianto, Satyanaga, Alfrendo, Wang, Chien Looi, Wong, Johnny Liang Heng, Lim, Vincent Han
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2021
Subjects:
Online Access:https://hdl.handle.net/10356/148872
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Nanyang Technological University
Language: English
id sg-ntu-dr.10356-148872
record_format dspace
spelling sg-ntu-dr.10356-1488722021-08-18T00:45:37Z Effects of unsaturated properties on stability of slope covered with Caesalpinia crista in Singapore Rahardjo, Harianto Satyanaga, Alfrendo Wang, Chien Looi Wong, Johnny Liang Heng Lim, Vincent Han School of Civil and Environmental Engineering Engineering::Civil engineering Environmental Engineering Finite-element Modelling Landslides Rainfall plays an important role in affecting the slope stability in a tropical country such as Singapore. The soil in Singapore is mainly residual soil with a deep groundwater table that is commonly found in the unsaturated condition in the presence of matric suction. This paper presents the unsaturated properties of soil with roots of Caesalpinia crista and their effects on slope stability during rainfall. Laboratory tests were carried out to obtain the index properties, saturated properties (i.e. permeability and shear strength) and unsaturated properties (i.e. unsaturated shear strength and soil-water characteristic curve) of soil with and without roots of C. crista. Seepage analyses were performed to obtain the variations in pore-water pressures during and after rainfall. Slope stability analyses were conducted to obtain variations in the factor of safety during and after rainfall. The results indicated that soil with roots of C. crista had a higher saturated volumetric water content, a higher air entry value, a lower saturated permeability and a higher shear strength compared with soil without roots. In addition, the soil with roots of C. crista was effective in reducing the water infiltration into the slope during rainfall. Hence, slope stability can be maintained during rainfall. 2021-08-18T00:43:18Z 2021-08-18T00:43:18Z 2020 Journal Article Rahardjo, H., Satyanaga, A., Wang, C. L., Wong, J. L. H. & Lim, V. H. (2020). Effects of unsaturated properties on stability of slope covered with Caesalpinia crista in Singapore. Environmental Geotechnics, 7(6), 393-403. https://dx.doi.org/10.1680/jenge.17.00031 2051-803X https://hdl.handle.net/10356/148872 10.1680/jenge.17.00031 2-s2.0-85075101160 6 7 393 403 en Environmental Geotechnics © 2020 ICE Publishing. All rights reserved
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
Environmental Engineering
Finite-element Modelling
Landslides
spellingShingle Engineering::Civil engineering
Environmental Engineering
Finite-element Modelling
Landslides
Rahardjo, Harianto
Satyanaga, Alfrendo
Wang, Chien Looi
Wong, Johnny Liang Heng
Lim, Vincent Han
Effects of unsaturated properties on stability of slope covered with Caesalpinia crista in Singapore
description Rainfall plays an important role in affecting the slope stability in a tropical country such as Singapore. The soil in Singapore is mainly residual soil with a deep groundwater table that is commonly found in the unsaturated condition in the presence of matric suction. This paper presents the unsaturated properties of soil with roots of Caesalpinia crista and their effects on slope stability during rainfall. Laboratory tests were carried out to obtain the index properties, saturated properties (i.e. permeability and shear strength) and unsaturated properties (i.e. unsaturated shear strength and soil-water characteristic curve) of soil with and without roots of C. crista. Seepage analyses were performed to obtain the variations in pore-water pressures during and after rainfall. Slope stability analyses were conducted to obtain variations in the factor of safety during and after rainfall. The results indicated that soil with roots of C. crista had a higher saturated volumetric water content, a higher air entry value, a lower saturated permeability and a higher shear strength compared with soil without roots. In addition, the soil with roots of C. crista was effective in reducing the water infiltration into the slope during rainfall. Hence, slope stability can be maintained during rainfall.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Rahardjo, Harianto
Satyanaga, Alfrendo
Wang, Chien Looi
Wong, Johnny Liang Heng
Lim, Vincent Han
format Article
author Rahardjo, Harianto
Satyanaga, Alfrendo
Wang, Chien Looi
Wong, Johnny Liang Heng
Lim, Vincent Han
author_sort Rahardjo, Harianto
title Effects of unsaturated properties on stability of slope covered with Caesalpinia crista in Singapore
title_short Effects of unsaturated properties on stability of slope covered with Caesalpinia crista in Singapore
title_full Effects of unsaturated properties on stability of slope covered with Caesalpinia crista in Singapore
title_fullStr Effects of unsaturated properties on stability of slope covered with Caesalpinia crista in Singapore
title_full_unstemmed Effects of unsaturated properties on stability of slope covered with Caesalpinia crista in Singapore
title_sort effects of unsaturated properties on stability of slope covered with caesalpinia crista in singapore
publishDate 2021
url https://hdl.handle.net/10356/148872
_version_ 1709685305664077824