Question

A concentrated load of 50 t acts vertically at a point on the soil surface.If Boussinesq's equation is applied for computation of stress, then the ratio of vertical stresses at depths of 3 m and 5 m respectively vertically below the point of application of load will be

• A. 0.36
• B. 0.60
• C. 1.66
• D. 2.77

Answer 1

The correct option is D 2.77

Vertical stress below point load,
${\sigma }_z=0.4775\frac{Q}{z^2}$
$\therefore \frac{{\sigma }_3}{{\sigma }_5}={\left(\frac{5}{3}\right)}^2=2.77$