Effect of suction and vegetation on the stability of slope along riverbank

Changes in sea water level and rainfall patterns can significantly affect the stability of a slope along a riverbank, especially in Singapore. As soil in Singapore is mainly composed of residual soil where the location of groundwater table is deep under the surface of the soil, a large amount of soi...

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Main Author: Handoko
Other Authors: Harianto Rahardjo
Format: Final Year Project
Language:English
Published: 2017
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Online Access:http://hdl.handle.net/10356/72204
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-722042023-03-03T16:58:04Z Effect of suction and vegetation on the stability of slope along riverbank Handoko Harianto Rahardjo School of Civil and Environmental Engineering DRNTU::Engineering::Civil engineering Changes in sea water level and rainfall patterns can significantly affect the stability of a slope along a riverbank, especially in Singapore. As soil in Singapore is mainly composed of residual soil where the location of groundwater table is deep under the surface of the soil, a large amount of soil above the groundwater table is in unsaturated condition where this part of soil is affected by matric suction. In this project, the effects of suction and vegetation on the stability of slope along riverbank were investigated. The properties of saturated and unsaturated soil with roots of Cynometra ramiflora and Melastoma malabathricum as well as soil without roots were measured in the laboratory using advanced geotechnical apparatuses. The results of experimental works indicated that the soil with higher percentage of roots has higher organic content. Furthermore, the higher the organic content of the soil, the higher the percentage of fine particles in that soil. Results from laboratory tests showed that soil with higher organic content has higher Air-Entry Value (AEV), lower saturated permeability, and higher shear strength. In summary, soil with roots of Cynometra ramiflora has a higher organic content than soil with roots of Melastoma malabathricum. Furthermore, numerical analyses were performed to obtain the variations in factor of safety during and after rainfall. The seepage and slope stability analyses results showed that the variations in factor of safety during and after rainfall are the highest for vegetation located at the entire slope. Soil slopes with higher organic content have a higher factor of safety than those soil slopes with lower organic content. Therefore, the soil slope covered with Cynometra ramiflora has a higher factor of safety as compared to the soil slope covered with Melastoma malabathricum. In conclusion, vegetation helps to improve the stability of slope by minimizing the amount of water infiltration into the soil and increasing the shear strength of the soil. Bachelor of Engineering (Civil) 2017-05-29T09:14:48Z 2017-05-29T09:14:48Z 2017 Final Year Project (FYP) http://hdl.handle.net/10356/72204 en Nanyang Technological University 60 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Civil engineering
spellingShingle DRNTU::Engineering::Civil engineering
Handoko
Effect of suction and vegetation on the stability of slope along riverbank
description Changes in sea water level and rainfall patterns can significantly affect the stability of a slope along a riverbank, especially in Singapore. As soil in Singapore is mainly composed of residual soil where the location of groundwater table is deep under the surface of the soil, a large amount of soil above the groundwater table is in unsaturated condition where this part of soil is affected by matric suction. In this project, the effects of suction and vegetation on the stability of slope along riverbank were investigated. The properties of saturated and unsaturated soil with roots of Cynometra ramiflora and Melastoma malabathricum as well as soil without roots were measured in the laboratory using advanced geotechnical apparatuses. The results of experimental works indicated that the soil with higher percentage of roots has higher organic content. Furthermore, the higher the organic content of the soil, the higher the percentage of fine particles in that soil. Results from laboratory tests showed that soil with higher organic content has higher Air-Entry Value (AEV), lower saturated permeability, and higher shear strength. In summary, soil with roots of Cynometra ramiflora has a higher organic content than soil with roots of Melastoma malabathricum. Furthermore, numerical analyses were performed to obtain the variations in factor of safety during and after rainfall. The seepage and slope stability analyses results showed that the variations in factor of safety during and after rainfall are the highest for vegetation located at the entire slope. Soil slopes with higher organic content have a higher factor of safety than those soil slopes with lower organic content. Therefore, the soil slope covered with Cynometra ramiflora has a higher factor of safety as compared to the soil slope covered with Melastoma malabathricum. In conclusion, vegetation helps to improve the stability of slope by minimizing the amount of water infiltration into the soil and increasing the shear strength of the soil.
author2 Harianto Rahardjo
author_facet Harianto Rahardjo
Handoko
format Final Year Project
author Handoko
author_sort Handoko
title Effect of suction and vegetation on the stability of slope along riverbank
title_short Effect of suction and vegetation on the stability of slope along riverbank
title_full Effect of suction and vegetation on the stability of slope along riverbank
title_fullStr Effect of suction and vegetation on the stability of slope along riverbank
title_full_unstemmed Effect of suction and vegetation on the stability of slope along riverbank
title_sort effect of suction and vegetation on the stability of slope along riverbank
publishDate 2017
url http://hdl.handle.net/10356/72204
_version_ 1759857353347301376