Slope Stability Model and Landslide Susceptibility Using Geo-technical Properties of Soil - Semi-quantitative Approaches for Landslide Assessment and Prediction - page 174

If the computed factor of safety is less than unity, the slope is clearly unstable
and likely to fall. If the factor of safety is greater than unity we cannot assume that
the slope is stable as we may not have chosen the most critical mode of failure
(i.e., failure surface) (Figs. 6.1 , 6.2 and 6.3 ).

Data Used

 =Lab.
Test

 = lab.
test

 [ topography
] = DEM

m
(assumpti
on)

Cohesion
(C)-lab.
Test.

Z=
Field
Stat.

FS=Factor of Safety

Susceptibility Map
Dry Condition.

Susceptibility Map
Semi-saturated
Condition.

Susceptibility Map
Saturated
Condition.

Verification

GPS Survey

Accuracy Study
[RS& GIS Based]

Instability Model

Fig. 6.1 Flow chart for landslide susceptibility maps