Question

If a square footing of size 4 m $\times$ 4 m is resting on the surface of a deposit of the above clay, the ultimate bearing capacity of the footing (as per Terzaghi's equation) is

• A. 1600 kPa
• B. 316 kPa
• C. 200 kPa
• D. 100 kPa

Answer 1

The correct option is C 200 kPa

Size of footing = 4 m $\times$ 4 m {square}
As per Terzaghi's equation,
Ultimate bearing capacity

$q_u=1.3C{N}_c+q{N}_q+\frac{1}{2}\times 0.8\gamma B{N}_{\gamma }$

For saturated clay
$N_c=5.7$
$N_q=1$
$N_{\gamma }=0$
On the surface of deposit of clay,
q = 0

$q=1.3C{N}_c+q{N}_q+\frac{1}{2}\times 0.8\gamma B{N}_{\gamma }$

$=1.3\times 27\times 5.7+0\times 1+0$
= 200.07
= 200 kPa