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Soil Mechanics and Foundation Engineering - Engineering

Q1:

For a base failure of a slope, depth factor

A Df = 1

B Df < 1

C Df > 1

D none of these.

ANS:C - Df > 1

Face failure df<1.
Base failure df>1.
Toe failure df=1. Face failure df<1.
Base failure df>1.
Toe failure df=1. The ratio of the depth of failure= (D+H).
To the depth of slope (H) is called depth factor (Df),
Df=H+D/H.

For the failure, depth factor (Df)= H/H=1 and for base failure,
Df>1.

And for face failure, Df<1.