Question

If change in voids ratio is 0.18 and change in effective pressure is 100KN/m^2, then the coefficient of compressibility is ______

(a) 2.5×10^-3 m^2/kN

(b) 2×10^-3 m^2/kN

(c) 9×10^-3 m^2/kN

(d) 9.5×10^-3 m^2/kN

I have been asked this question during an internship interview.

Query is from Consolidation Problems topic in section One Dimensional Consolidation of Geotechnical Engineering I

Answer 1

Right choice is (b) 2×10^-3 m^2/kN

Easiest explanation: Given,

∆e=0.18

∆σ’=100 kN/m^3

\(a_w = \frac{∆e}{∆σ’} = \frac{0.18}{100}\)=2×10^-3 m^2/kN.