Failure Mechanism of a Shallow Landslide at Tun-Sardon Road Cut Section of Penang Island,Malaysia |
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Authors: | Email author" target="_blank">Younus?Ahmed?KhanEmail author Habibah?Lateh |
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Institution: | (1) Department of Geology and Mining, University of Rajshahi, Rajshahi, 6205, Bangladesh;(2) School of Distance Education, University Sains Malaysia, USM, 11800 Penang, Malaysia |
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Abstract: | The occurrences of shallow landslides in residual soils of Penang hilly areas are common in rainy days. The failure mechanisms
of a shallow landslide occurred at km 3.9 road in Tun-Sardon area of Penang Island have been simulated using two different
methods of slope stability analysis. The results indicate that the failure was initiated locally inside the slope and then
propagated further to induce total failure. The failure propagation was started from initial local failure zone and was driven
by mobilized shear strength along the shear plane. The slope was marginally stable with an overall factor of safety of 1.32
before it failed to a rainfall event on September 6, 2008. It is found from back calculation that the rain infiltration raised
the temporary water level and reduced the shearing strength of soil to a minimum level with increased pore water pressure
to trigger the failure. This paper suggests further research on shallow landslide of Penang Island considering the direct
rainfall infiltration effect in terms of groundwater pressure-head distribution inside the slope. |
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