Question

When a load test was conducted by putting a 60 cm square plate on top of a sandy deposit, the ultimate bearing capacity was observed as $60kN/m^2$. What is the ultimate bearing capacity for a strip footing of 1.2 m width to be placed on the surface of the same soil?

• A. $75kN/m^2$
• B. $120kN./m^2$
• C. $150kN/m^2$
• D. $160kN/m^2$

Answer 1

The correct option is C $150kN/m^2$

According to Terzaghi,
$q_{nu}=0.5\gamma B{N}_{\gamma }$

For strip footing
$=0.4\gamma B{N}_{\gamma }$

For square footing

Using the above equations,

$\gamma N_{\gamma }=\frac{60}{0.4\times 0.6}=250kN/m^3$

For strip footing,

$q_{nu}=0.5\times 1.2\times 250=150kN/m^2$