Performance of an instrumented slope covered by a capillary barrier system

A capillary barrier as a cover system is a two‐layer system of distinct hydraulic properties to prevent water infiltration into the underlying soil by utilizing unsaturated soil mechanics principles. This paper illustrates the application of the capillary barrier system on a slope which experienced...

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Main Authors: Rahardjo, Harianto, Santoso, Vera Amalia, Leong, Eng Choon, Ng, Yew Song, Hua, Chai Juay
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2011
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Online Access:https://hdl.handle.net/10356/94495
http://hdl.handle.net/10220/7350
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-944952020-03-07T11:43:42Z Performance of an instrumented slope covered by a capillary barrier system Rahardjo, Harianto Santoso, Vera Amalia Leong, Eng Choon Ng, Yew Song Hua, Chai Juay School of Civil and Environmental Engineering DRNTU::Engineering::Civil engineering::Geotechnical A capillary barrier as a cover system is a two‐layer system of distinct hydraulic properties to prevent water infiltration into the underlying soil by utilizing unsaturated soil mechanics principles. This paper illustrates the application of the capillary barrier system on a slope which experienced shallow slip failures to prevent future rainfall‐induced slope failures. In this study, the capillary barrier system was designed as a cover system for residual soil slopes with a steep slope angle under heavy rainfall conditions of the tropics. The capillary barrier system was constructed using fine sand as the fine‐grained layer and granite chips as the coarse‐grained layer. Both layers were contained in cellular confinement system. The slope was instrumented with tensiometers and piezometers. The tensiometers were installed at different depths from about 0.5 m to 2.0 m below the slope surface. An adjacent original slope without the capillary barrier system was also instrumented using tensiometers in order to investigate the performance and effectiveness of the capillary barrier system in reducing rainwater infiltration and maintaining negative pore‐water pressure in the slope. The detailed installation of matric suction measurement device is discussed comprehensively in this paper. The measurement results showed that the capillary barrier system was effective in maintaining the negative pore‐water pressures during rainfalls, particularly on the crest of the slope. Accepted version 2011-12-07T06:58:30Z 2019-12-06T18:57:07Z 2011-12-07T06:58:30Z 2019-12-06T18:57:07Z 2011 2011 Journal Article Rahardjo, H., Santoso, V. A., Leong, E. C., Ng, Y. S., & Hua, C. J. (2011). Performance of an instrumented slope covered by a capillary barrier system. Journal of geotechnical and geoenvironmental engineering (accepted for publication – July 2011) https://hdl.handle.net/10356/94495 http://hdl.handle.net/10220/7350 10.1061/(ASCE)GT.1943-5606.0000600 en Journal of geotechnical and geoenvironmental engineering © 2011 ASCE
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
Hua, Chai Juay
Performance of an instrumented slope covered by a capillary barrier system
description A capillary barrier as a cover system is a two‐layer system of distinct hydraulic properties to prevent water infiltration into the underlying soil by utilizing unsaturated soil mechanics principles. This paper illustrates the application of the capillary barrier system on a slope which experienced shallow slip failures to prevent future rainfall‐induced slope failures. In this study, the capillary barrier system was designed as a cover system for residual soil slopes with a steep slope angle under heavy rainfall conditions of the tropics. The capillary barrier system was constructed using fine sand as the fine‐grained layer and granite chips as the coarse‐grained layer. Both layers were contained in cellular confinement system. The slope was instrumented with tensiometers and piezometers. The tensiometers were installed at different depths from about 0.5 m to 2.0 m below the slope surface. An adjacent original slope without the capillary barrier system was also instrumented using tensiometers in order to investigate the performance and effectiveness of the capillary barrier system in reducing rainwater infiltration and maintaining negative pore‐water pressure in the slope. The detailed installation of matric suction measurement device is discussed comprehensively in this paper. The measurement results showed that the capillary barrier system was effective in maintaining the negative pore‐water pressures during rainfalls, particularly on the crest 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
Hua, Chai Juay
format Article
author Rahardjo, Harianto
Santoso, Vera Amalia
Leong, Eng Choon
Ng, Yew Song
Hua, Chai Juay
author_sort Rahardjo, Harianto
title Performance of an instrumented slope covered by a capillary barrier system
title_short Performance of an instrumented slope covered by a capillary barrier system
title_full Performance of an instrumented slope covered by a capillary barrier system
title_fullStr Performance of an instrumented slope covered by a capillary barrier system
title_full_unstemmed Performance of an instrumented slope covered by a capillary barrier system
title_sort performance of an instrumented slope covered by a capillary barrier system
publishDate 2011
url https://hdl.handle.net/10356/94495
http://hdl.handle.net/10220/7350
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