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Pore-water pressure characteristics of two instrumented residual soil slopes

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Pore-water pressure characteristics of two instrumented residual soil slopes

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Title: Pore-water pressure characteristics of two instrumented residual soil slopes
Author: Rahardjo, Harianto; Santoso, Vera Amalia; Leong, Eng Choon; Ng, Yew Song; Pang, Henry Tam Cheuk
Copyright year: 2010
Abstract: Responses of pore-water pressures in unsaturated soil slopes during rainfall have major influences in triggering slope failures. Two fully instrumented residual soil slopes located in two major geological formations in Singapore, that are Bukit Timah Granite and sedimentary Jurong Formation, were monitored for a period of several months. Real-time monitoring systems in the slopes were used to provide pore-water pressure, rainfall, and ground water level data. Characteristics of pore-water pressure distributions in both slopes during rainfalls were studied and compared. The monitoring results indicate that the Bukit Timah Granite residual soil slope has a deeper ground water table and a thicker unsaturated zone than the sedimentary Jurong Formation residual soil slope. A higher permeability of the Bukit Timah Granite residual soil results in a faster change in negative pore-water pressure due to rainwater infiltration as compared to those of the sedimentary Jurong Formation residual soil. Consequently, changes in shear strength and factor of safety of the Bukit Timah Granite residual soil slope during rainfall have different characteristics than those of the Jurong Formation residual soil. The differing characteristics of pore-water pressure responses during rainfall in these two residual soils are analyzed and highlighted in the paper.
Subject: DRNTU::Engineering::Civil engineering::Geotechnical.
Type: Conference Paper
Conference name: Asia-Pacific Conference on Unsaturated Soils (4th : 2009 : Newcastle, Australia)
School: School of Civil and Environmental Engineering
Related Organization: Building Technology Department, Housing and Development Board, Singapore
Rights: © 2010 Taylor & Francis Group. This is the author created version of a work that has been peer reviewed and accepted for publication by 4th Asia-Pacific Conference on Unsaturated Soils, Newcastle, Australia, Taylor & Francis Group. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The official website of publisher is available at: [URL: http://www.taylorandfrancisgroup.com/ ]
Version: Accepted version

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