Use of recycled crushed concrete and Secudrain in capillary barriers for slope stabilization

A capillary barrier is a two-layer cover system having distinct hydraulic properties to minimize water infiltration into the underlying soil by utilizing unsaturated soil mechanics principles. In this study, a capillary barrier system was designed as a cover system for a residual soil slope to maint...

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Main Authors: Rahardjo, Harianto, Santoso, Vera Amalia, Leong, Eng Choon, Ng, Yew Song, Pang, Henry Tam Cheuk, Satyanaga, Alfrendo
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2013
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Online Access:https://hdl.handle.net/10356/104611
http://hdl.handle.net/10220/16995
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1046112020-03-07T11:43:35Z Use of recycled crushed concrete and Secudrain in capillary barriers for slope stabilization Rahardjo, Harianto Santoso, Vera Amalia Leong, Eng Choon Ng, Yew Song Pang, Henry Tam Cheuk Satyanaga, Alfrendo School of Civil and Environmental Engineering DRNTU::Engineering::Civil engineering::Geotechnical A capillary barrier is a two-layer cover system having distinct hydraulic properties to minimize water infiltration into the underlying soil by utilizing unsaturated soil mechanics principles. In this study, a capillary barrier system was designed as a cover system for a residual soil slope to maintain stability of the slope by minimizing infiltration during heavy rainfalls in the tropics. The capillary barrier system (CBS) was constructed using fine sand as the fine-grained layer and recycled crushed concrete aggregates as the coarse-grained layer. The coarse-grained layer is commonly constructed using gravels or granite chips. However, due to scarcity of aggregates and in consideration of environmental sustainability, recycled crushed concrete aggregates were used as the coarse-grained layer in this project. The suitability of recycled crushed concrete aggregates as a material within the coarse-grained layer of a CBS is subject to the hydraulic property requirement. For comparison, another CBS was constructed using fine sand as the fine-grained layer and a geosynthetic (Secudrain) as the coarse-grained layer. The performance of each constructed CBS on the residual soil slope was monitored using tensiometers installed at different depths — from 0.6 to 1.8 m below the slope surface — and a rainfall gauge mounted on the slope. An adjacent original slope without the CBS was also instrumented using tensiometers and piezometers to investigate the performance and effectiveness of the CBS in reducing rainwater infiltration and maintaining negative pore-water pressures in the slope. Real-time monitoring systems were developed to examine pore-water pressure, rainfall, and groundwater level in the slopes over a 1 year period. Characteristics of pore-water pressure distributions in the residual soil slope under a CBS with recycled crushed concrete aggregates and in the original slope during typical rainfalls are highlighted and compared. The measurement results show that the CBS was effective in minimizing rainwater infiltration and therefore, maintaining stability of the slope. 2013-10-29T05:18:35Z 2019-12-06T21:36:14Z 2013-10-29T05:18:35Z 2019-12-06T21:36:14Z 2013 2013 Journal Article Rahardjo, H., Santoso, V. A., Leong, E. C., Ng, Y. S., Pang, H. T. C., & Satyanaga, A. (2013). Use of recycled crushed concrete and Secudrain in capillary barriers for slope stabilization. Canadian geotechnical journal, 50(6), 662-673. https://hdl.handle.net/10356/104611 http://hdl.handle.net/10220/16995 10.1139/cgj-2012-0035 en Canadian geotechnical journal
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic DRNTU::Engineering::Civil engineering::Geotechnical
spellingShingle DRNTU::Engineering::Civil engineering::Geotechnical
Rahardjo, Harianto
Santoso, Vera Amalia
Leong, Eng Choon
Ng, Yew Song
Pang, Henry Tam Cheuk
Satyanaga, Alfrendo
Use of recycled crushed concrete and Secudrain in capillary barriers for slope stabilization
description A capillary barrier is a two-layer cover system having distinct hydraulic properties to minimize water infiltration into the underlying soil by utilizing unsaturated soil mechanics principles. In this study, a capillary barrier system was designed as a cover system for a residual soil slope to maintain stability of the slope by minimizing infiltration during heavy rainfalls in the tropics. The capillary barrier system (CBS) was constructed using fine sand as the fine-grained layer and recycled crushed concrete aggregates as the coarse-grained layer. The coarse-grained layer is commonly constructed using gravels or granite chips. However, due to scarcity of aggregates and in consideration of environmental sustainability, recycled crushed concrete aggregates were used as the coarse-grained layer in this project. The suitability of recycled crushed concrete aggregates as a material within the coarse-grained layer of a CBS is subject to the hydraulic property requirement. For comparison, another CBS was constructed using fine sand as the fine-grained layer and a geosynthetic (Secudrain) as the coarse-grained layer. The performance of each constructed CBS on the residual soil slope was monitored using tensiometers installed at different depths — from 0.6 to 1.8 m below the slope surface — and a rainfall gauge mounted on the slope. An adjacent original slope without the CBS was also instrumented using tensiometers and piezometers to investigate the performance and effectiveness of the CBS in reducing rainwater infiltration and maintaining negative pore-water pressures in the slope. Real-time monitoring systems were developed to examine pore-water pressure, rainfall, and groundwater level in the slopes over a 1 year period. Characteristics of pore-water pressure distributions in the residual soil slope under a CBS with recycled crushed concrete aggregates and in the original slope during typical rainfalls are highlighted and compared. The measurement results show that the CBS was effective in minimizing rainwater infiltration and therefore, maintaining stability of the slope.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Rahardjo, Harianto
Santoso, Vera Amalia
Leong, Eng Choon
Ng, Yew Song
Pang, Henry Tam Cheuk
Satyanaga, Alfrendo
format Article
author Rahardjo, Harianto
Santoso, Vera Amalia
Leong, Eng Choon
Ng, Yew Song
Pang, Henry Tam Cheuk
Satyanaga, Alfrendo
author_sort Rahardjo, Harianto
title Use of recycled crushed concrete and Secudrain in capillary barriers for slope stabilization
title_short Use of recycled crushed concrete and Secudrain in capillary barriers for slope stabilization
title_full Use of recycled crushed concrete and Secudrain in capillary barriers for slope stabilization
title_fullStr Use of recycled crushed concrete and Secudrain in capillary barriers for slope stabilization
title_full_unstemmed Use of recycled crushed concrete and Secudrain in capillary barriers for slope stabilization
title_sort use of recycled crushed concrete and secudrain in capillary barriers for slope stabilization
publishDate 2013
url https://hdl.handle.net/10356/104611
http://hdl.handle.net/10220/16995
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