Slope stability against rainfall and preventive measures
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 soi...
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| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Conference or Workshop Item |
| Language: | English |
| Published: |
2011
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/94069 http://hdl.handle.net/10220/7212 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | 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. |
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