Question

The Boussinesq influence factor for r/z ratio equal to 0.3 is given by ____________

(a) 0.3840

(b) 0.5465

(c) 0.9873

(d) 0.2312

The question was posed to me by my college professor while I was bunking the class.

I need to ask this question from Stress Distribution topic in chapter Stress Distribution of Geotechnical Engineering I

Answer 1

The correct choice is (a) 0.3840

To explain I would say: Given,

r/z=0.3

The Boussinesq influence factor is given by,

\(K_B=\frac{3}{2π}\left[\frac{1}{1+(\frac{r}{z})^2}\right]^{\frac{5}{2}} \)

\(K_B=\frac{3}{2π}\left[\frac{1}{1+(0.3)}^2\right]^{\frac{5}{2}} \)

KB=0.3840.