Question

The change in voids ratio is 0.18 and initial void ratio is 0.68 with the increase of pressure as 200KN/m^2. Find the coefficient of volume change.

(a) 0.536 m^2/MN

(b) 0.111 m^2/MN

(c) 0.832 m^2/MN

(d) 0.356 m^2/MN

This question was addressed to me during a job interview.

I want to ask this question from Consolidation Problems in chapter One Dimensional Consolidation of Geotechnical Engineering I

Answer 1

Right choice is (a) 0.536 m^2/MN

For explanation I would say: Given,

∆ef=0.18

eo=0.68

∆σ’=200kN/m^2

\(m_v=\frac{-∆e}{1+e_o}\frac{1}{∆σ’}\)

\(m_v=\frac{0.18}{1+0.68}+\frac{1}{200}=0.536m^2/MN.\)