Question

A raft of $6m\times 9m$ is founded at a depth of 3m in a cohesive soil having $c=120kN/m^2$. The ultimate net bearing capacity of the soil using the Terzaghi's theory will be nearly

• A. $820kN/m^2$
• B. $920kN/m^2$
• C. $1036kN/m^2$
• D. $1067kN/m^2$

Answer 1

The correct option is A $820kN/m^2$

(a)
$q_{net.ult}=s_{c}c{N}_c$
where shape factor,

$s_c=1+0.3B/L$

$=1+0.3\times \frac{6}{9}=1.2$

$\therefore q_{net,ult}=1.2\times 120\times 5.7$

$=820.8kN/m^2$