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