ENV-3A1Y/ENVF3A1Y: Natural Hazards: 2009 - 10. Landslide Hazards N.K. Tovey Н.К.Тови. 15,699 days ago today 43 years ago next Wednesday. Lecture 4. Lecture 3. Lecture 1. Lecture 2. Landslide on Main Highway at km 365 west of Sao Paulo: August 2002.
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15,699 days ago today
43 years ago next Wednesday
Landslide on Main Highway at km 365 west of Sao Paulo: August 2002
[ but may be in Lab A depending on how things goes in Week 1]
Failure of slope above Po Shan Road in June 1972
Landslides as a Hazard
Landslides associated with
Main Manchester – Sheffield Road (A625)
Alternative route – only suitable for light vehicles – gradient of 1 in 4
Forces resisting landslide movement arising from the inherent strength of the soil.
Forces trying to cause failure
(i.e. the mobilizing forces).
Fs> 1 stable
But is it?
Fs = 1 just stable
But is it?
Fs < 1 unstable
Heave at toe
Steep scar to rotational failure
Safe at the moment
Man’s Influence (Agriculture /Development)
Cut / Fill Slopes
Material Properties (Shear Strength)
Force (S) required to move block is proportional to Normal Force (N)
On a slope
N depends on weight and
N = W cos
S also depends on weight and
N = W sin