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8/16/2019 DAB20702_BAB 5 SLOPE STABILITY.pdf
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Slope Stability
PREPARED BY AHMAD HAKIMI BIN MAT NOR
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5.2 Soil movements / Slope instability
Falls
Topples
Slides- rotational, compound, translational
Lateral spreads
Flows
Complex or compound failure
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5.2.1 Types of soil movements
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CASE HISTORIES 1
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5.3 Causes of instability
Main categories- the causes of slope instability:
• Ground conditions- weathered, fissures, etc.
• Geomorphological processes- tectonic
activities, wave erosion, etc.
• Physical processes- rainfall, tidal effects,etc.
• Man-made processes- excavation, drawdown
of water level (reservoirs), mining, quarrying,
etc.
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Common causes of slope instability:
• Weathering effect
• Changes of slope geometry
• Decrease in effective stress of soil mass
• Excess loading (equivalent to increase in
height of slope)
• Poor design and/or construction- e.g.excavation near toe of existing slope
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5.4 Slope stability analysis
Methods of analysis:
• Infinite slope method- plane translational
slide
• Effective and total stress approach (usually
fu = 0o)
• Fellenius or Swedish or ordinary slice
method
• Method of slices (effective stress)- Bishop’s
method, Bishop’s modified method
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• Taylor’s method- undrained analysis
• Bishop-Morgenstern’s method
• Janbu’s method- non-circular slip surfaces
• Wedge method- single plane
Focus:
• Fellenius or Swedish or ordinary slice method-(rujuk
contoh kaedah hirisan)
•Kaedah menggunakan perisian Geo-slope (versi
pelajar)
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Contoh: Kaedah Hirisan
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Rajah S2(c)
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Penyelesaian:
With radius R = 14.2m, the trial surface circle has been drawn
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Fs = 1.32>1 slope ok
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5.5 Teknik-teknik untuk stabilkan cerun
• Membina tembok penahan(retaining wall)
• Membina tembok gabion.
• Membina sistem penambat.• Menaman rumput.
• Memasang geosintetik.
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Tembok penahan(retaining wall)
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Tembok gabion
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Sistem penambat
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Menaman rumput.
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Geosintetik
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END
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