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Slope Mitigation Mea-sure for
Sekolah Menengah Ke-bangsaan Sultan Haji Ahmad Shah, Tanah Rata, Cameron High-
land.Nuril Shahzira binti Roslan
2013813994Supervisor: Dr Ismachayadi
PRESENTATION OUT-LINES
• Introduction• Theoretical Background • Slope stability analysis• Proposed mitigation
method• Gap of research• Methodology• Preliminary Result• Conclusion
INTRODUCTION Slope stability is the most important is-
sues in geotechnical engineering.
Malaysia is one of the tropical countries that
receive daily rainfall throughout the year and this condition can cause so many slope failures due to the heavy rainfall at hillsides area.
Based on this condition, make a re-search to
proposed mitigation measure to re-duce the slope failure.
Problem State-ment
The shear strength parameter must be considered to analyze the behavior of soils in slope stability.
The slope failure mostly caused by rapid change in rainfall influence the infiltration depth.
The existing structure scientifically does not give any improvement in slope stabilization.
Proposed the retaining structure to protect against
slope failure
Objective
a) To analyses the design and stability of the slope in three mitigation measure.
b) To access design and analyze the stability of the proposed slope mitigation measures and retaining structures.
Significant Study
This study will enhance the understanding the actual concept of slope failure at site.
This study help us to understand further about soil behavior through the laboratory test and in situ test
The importance of this study is to understand the effect moisture content of soil to the slope
Theoretical Back-ground
SiteTanah Rata,
Cameron Highland
Geological Formation : Geological map it shows
that was felsic to intermediate intrusive.
This intrusive shows that formation of igneous rock in
Cameron Highland site.
Strength Parameter: saturated unit weight
effective cohesioneffective friction angle
Infiltration depth: Infiltration is a process
movement of water into a soil profile.
Soil characteristic influence the infiltration depth into the soil layerThe infiltration rate is
influenced by rainfall intensity at the area.
Slope Stability Analysisordinary method
Simplified Bishop Method
Janbu Method
Proposed Mitigation Measure
Tieback Wall
Sheet Pile Wall Crib Wall
Gap of Research
Author Title Finding GapMohd Azri Mohd
Zin
(2012)
Slope stability study at
UITM Puncak Alam
Analyze FOS for existing
slope using PLAXIS
program.
Analyze FOS for existing
slope using GEO Studio
2007 (SLOPE/W)
Yingfa Lu
(2014)
Deformation and
failure mechanism of
slope in three
dimensions
Analyze two failure
modes which are for the
thrust- type landslide
and pull-type landslide.
Analyze two failure
mode which are slope
based on the soil profile
and slope effect due to
the infiltration depth
Gap of Research
K.Y. Choi, Raymond
W.M Cheung
(2013)
Landslide disaster
prevention and
mitigation through
work in Hong Kong
Proposed soil nailing as
mitigation measure for
slope stability
Proposed 3 mitigation
measure for slope
stability which is tieback
wall, sheet pile wall, and
crib wall
Hamed Niroumand
(2012)
Slope Stability and
Sheet Pile and
Contiguous Bored Pile
Walls
Method slope stability
analysis used was
Simplified Bishop
method, Janbu method,
Morgenstem & price and
Sarma.
Method slope stability
analysis used was
Simplified Bishop
method, Janbu method
and Ordinary method.
Author Title Finding Gap
Methodology
Problem Statement
Define Objective
Slope stability analysis using SLOPE/W
Verify and solve problem
Compare Factor of Safety
Slope Cross Sec-tion
Cross Section of Slope Based on Goggle Earth.
Soil Profile
Soil Profile
Soil Profile
silty SAND
silty SAND
sandy SILT
Slope Cross Sec-tion
Cross Section Soil
Profile
medium sandy SILTstiff sandy SILTloose silty SANDmedium dense silty SANDdense silty SANDvery dense silty SAND
Preliminary Result110100908070605040302010
0 50 100 150 200 250 300 350
Without infiltration depth
Ordinary method
Bishop method
Janbu method
0.895
1.239
1.119
Preliminary Result
0 50 100 150 200 250 300 350
110100908070605040302010
With infiltration depth Depth
1m
Ordinary method
Bishop method
Janbu method
0.945
1.244
1.126
Preliminary Result
0 50 100 150 200 250 300 350
110100908070605040302010
With infiltration depth Depth
2m
Ordinary
method
Bishop method
Janbu method
0.94
0
1.22
3
1.10
6
Preliminary Result110100908070605040302010
With infiltration depth Depth
3m
0 50 100 150 200 250 300 350
Ordinary
method
Bishop method
Janbu method
0.926
1.236
1.116
ConclusionThe slope was evaluated and the infiltration depth was considered in the SLOPE/W and the factor of safety was determined from the solve analysis in the software.
The infiltration depth influenced the value of FOS where the slope expected to fail.
Hence the mitigation measure was proposed to stabilize the slope.