Question

A foundation is considered as shallow if its depth is

• A. Less than 1 meter
• B. Greater than its width
• C. Equal to or less than its width
• D. Greater than 1 meter

Answer 1

The correct option is C Equal to or less than its width


As per terzaghi
$\text{If,}\left(\frac{D_f}{B}\right)\le 1$

$\Rightarrow D_f\le B\to \text{The foundation is called shallow foundation.}$

Eg., combined footing, raft foundation, isolated footing.

$\text{Note: If}\left(\frac{D_f}{B}\right)>15\to \text{the foundation is called deep foundation.}$
Eg., pile foundation