Structural design for landslide prevention system
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Date
2019-06
Authors
Anis Syahirah Binti Mohd Azam
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Abstract
A study was conducted to propose and assess the suitability of a structural design for
landslide prevention system located at Lot 442, Mukim 14, Bandar Air Itam, North East
District, Penang. A landslide prevention system has been designed to provide maximum
protection in Jalan Empangan Air Itam against number of casualties and economic losses. A
system consists of three phases, which include flexible barrier, concrete baffles and rigid barrier
were employed to reduce the risk. The conceptual of landslide prevention system is visualized
by a 3.5 meter long model to conduct experiments to observe the impact of a flexible barrier,
the concrete baffle configurations and the appropriate rigid barrier height. The physical
landslide modelling was performed using the most critical cross section obtained from the field
work in order to investigate the effect of changes in debris properties on the barrier’s structural
response subject to debris impact. Geotechnical laboratory analysis were performed to identify
and characterize the two sample taken at the study area. The results of laboratory analysis
revealed that the Sample 1 can be classified as sand due to the dominance of 80.28 percent sand
content and contains large quantity of organic matter or porous particles, whereas Sample 2 is
classified as silty sand due to the dominance of 45.75 percent silt content and mainly contains
inorganic soils. The flexible barrier is permanently deformed when the moisture content of the
soil reached 26 percent. The implementation of three transverse percentage blockages and the
number of rows investigated ranges from 1 to 2 were adopted to study the effect on flow
impedance of concrete baffles. Comparing with unobstructed flow, the use of two rows of
baffles and an increase in the degree of transverse blockage from 23 percent to 35 percent
provides up to 75 percent run-out distance reduction. Built upon BS8100 and MS EN
1990:2010, a 5 meter high cantilever retaining wall is designed. The height of the rigid barrier
is designed to ensure adequate retention and to prevent overflowing. The combination of three
different barriers was assessed and the result showed that the run-out distance was significantly
decreased by up to 47 percent compared to unobstructed flow.