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...
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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 |
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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 |
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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. |
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School of Civil and Environmental Engineering |
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School of Civil and Environmental Engineering Rahardjo, Harianto Satyanaga, Alfrendo Wang, Chien Looi Wong, Johnny Liang Heng Lim, Vincent Han |
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Article |
author |
Rahardjo, Harianto Satyanaga, Alfrendo Wang, Chien Looi Wong, Johnny Liang Heng Lim, Vincent Han |
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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 |
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https://hdl.handle.net/10356/148872 |
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