Influence of El-Nino adapted rainfall event on partially saturated slope behavior
This paper investigates the effect of El-Nino rainfall pattern on the unsaturated slope behavior in terms of the generation of pore-water pressure and factor of safety. The El-Nino can carry dry weather and warm ocean which may lead to the occurrence of increased rainfall. This phenomenon is co...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | en en |
| Published: |
Books & Journals Private Ltd.
2021
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/93652/7/93652_Influence%20of%20El-Nino%20adapted%20rainfall%20event%20on%20partially%20saturated%20slope%20behavior_SCOPUS.pdf http://irep.iium.edu.my/93652/8/93652_Influence%20of%20El-Nino%20adapted%20rainfall%20event%20on%20partially%20saturated%20slope%20behavior.pdf http://irep.iium.edu.my/93652/ http://www.jmmf.info/2021/?post_type=current-issues |
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| Summary: | This paper investigates the effect of El-Nino rainfall pattern
on the unsaturated slope behavior in terms of the generation
of pore-water pressure and factor of safety. The El-Nino can
carry dry weather and warm ocean which may lead to the
occurrence of increased rainfall. This phenomenon is
common in Malaysia and it has hit the nation for so many
years. Throughout the event, a landslide is prone to take
place and may lead to fatal accidents. Typically, Malaysian
soil is classified in residual and have high vadose zones
especially during the dry period. Due to high-intensity
rainfall, the reduction in soil suction can be seen happening
drastically, thus reducing the soil strength. This study aims
to capture the unsaturated slope behavior and stability due
to the influence of El-Nino adapted rainfall event. The
objective is to determine the significant rainfall intensity that
affects the soil suction and the factor of safety via
modification using the idealised rainfall approach and El-
Nino adapted event. In this paper, a series of real rainfall in
2006 from the Department of Irrigation and Drainage (DID)
Malaysia was used, labelled as the actual rainfall on
numerical slope models. The slope geometry is illustrated
according to a failed slope in Kolej Ibrahim Yaakub, UKM
and the soil parameters and flow characteristics are
gathered from the literature. By considering a very low
groundwater table, the actual rainfall shows no significant
reduction of pore-water pressure. Nevertheless, as the
rainfall pattern is reformed with an idealised approach and
adapted to the El-Nino rainfall event, the pore-water
pressure and factor of safety estimatedly reduced. Captivatingly, El-Nino adapted rainfall for December 2006
event with lower average monthly intensity but
continuously showed high rainfall intensity in the beginning
and ending phase. The adapted rainfall has affected the
pore-water pressure with 3 kPa different and the factor of
safety decreased down to 1.95. It is significant that the
change and decrease in the slope behavior and stability,
respectively, are caused by the unsaturated soil properties
and the rainfall intensity itself since the groundwater level
is too deep to influence the results. |
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