A study on the effect of extreme rainfall intensity on slope stabilty using physical based modelling
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Date
2019-06
Authors
Muhammad Hazwan Bin Zaki
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Abstract
This study focused on assessing the effect of extreme rainfall intensity to slope
stability using a physical based modelling. In this study, identified extreme rainfall
intensity are modelled in a physical model with a measurement of Volumetric Water
Content and Matric Suction within the slope. Selected extreme rainfall intensity is 60
mm/hr which the heaviest hourly rainfall intensity at Sarawak on 3rd of January, 2016
and 80 mm/hr which in Penang on 10th October, 2016. The simulation is conducted in a
4 different cases and parameter. The duration of the simulated rainfall is 6-hour. The
overall trend of the matric suction measurement in each cases is increasing with a few
exceptions of tensiometer that shows decreasing value. After the rain simulation stopped,
the matric suction decreased rapidly and remain stagnant follow by a significant dropping
significantly. For the volumetric water content, there is a similar increase in the trend
during the rainfall simulation. However, there is difference in term of initial and
increment of water content for different part of the slope. for the lower part of the slope,
the initial water content is much higher which at 60 – 70 % with an increment of 15 – 20
% uring the rainfall simulation. While for the lower part are at 20 -25 % with a slight
increment of 5-7 % during rainfall simulation. For all cases the failure had been occurred
but on a different time and volume of mass wasting. It shows that the increased in slope
inclination angle and rainfall intensity would affect the slope stability. Numerical
analysis is done to model the cases in Geostudio software.