Slope stability against rainfall and preventive measures
Author
Rahardjo, Harianto
Satyanaga, Alfrendo
Leong, Eng Choon
Ng, Yew Song
Pang, Henry Tam Cheuk
Hua, Chai Juay
Date of Issue
2009Conference Name
Structural Inspection and Restoration of Building Safety (2009)
School
School of Civil and Environmental Engineering
Abstract
Slope failures caused by rainfall are common occurrences in Singapore and
Southeast Asia. Many residual soil slopes have a deep groundwater table with a
thick unsaturated soil zone above the water table. Infiltration rate into slopes is
governed by permeability of the unsaturated soil above the groundwater table. As
a result, changes in negative pore-water pressure or soil suction and
consequently in shear strength of unsaturated soil are a function of water content.
NTU and HDB have embarked on research collaboration to study the mechanism
of rainfall infiltration into residual soil slopes in Singapore under local climatic
conditions and the effects of rainfalls on stability of slopes. Unsaturated soil
mechanics and unsaturated soil properties are used in assessing stability of
slopes against rainfall. Measurements of soil properties are carried out using
unsaturated soil apparatuses and technology. In addition, preventive measures for
rainfall-induced slope failures are investigated using the principles of unsaturated
soil mechanics. Preliminary results of the assessment and preventive measures
based on unsaturated soil mechanics principles are illustrated.
Subject
DRNTU::Engineering::Civil engineering::Geotechnical
Type
Conference Paper
Rights
© 2009 BCA Seminar on “Structural Inspection and Restoration of Building Safety”.
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