Question

If r/z ratio is 2 and load of 20 kN is acting at a point, then the vertical pressure at a depth 6m is ____________

(a) 0.4356 kN/m^2

(b) 0.244 kN/m^2

(c) 0.1518 kN/m^2

(d) 4.72*10^-3 kN/m^2

This question was posed to me in an online interview.

Origin of the question is Stress Distribution in division Stress Distribution of Geotechnical Engineering I

Answer 1

The correct option is (d) 4.72*10^-3 kN/m^2

Easiest explanation: Given,

r/z=2

Q=20 kN

Z=6m

\(σ_z=\frac{0.0085Q}{z^2} \)

\(σ_z=\frac{0.0085*20}{6^2} \)

σz=4.72*10^-3 kN/m^2.