Stability of Slopes

– The driving force (gravity) overcomes the resistance derived from the shear strength of the soil along the rupture surface

Slope Stability Analysis

-Calculation to check the safety of natural slopes, slopes of excavations and of compacted embankments.
-The check involves determining and comparing the shear stress developed along the most likely rupture surface to the shear strength of soil.

Factor Of  Safety

Stability Of Slope

˜Infinite slope without seepage
˜Infinite slope with seepage
˜Finite slope with Plane Failure Surface (Cullman’s Method)
˜Finite slope with Circular Failure Surface
(Method of Slices)

Infinite Slope


For granular soils, c=0, Fs is independent of height H, and the slope is stable as long as  b < f

Finite slope with Plane Failure Surface










Finite slope with Circular Failure Surface












Slopes in Homogeneous Clay (f=0)
















































Method of  Slice

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