Question

The expansion curve is given by the expression ___________

(a) \(e_0=elog_{10} \frac{σ’_0+∆σ’}{σ’_0} \)

(b) \(e_0=e/C_s  \frac{σ’_0+∆σ’}{σ’_0} \)

(c) \(e_0=e-C_s log_{10}\frac{σ’_0+∆σ’}{σ’_0} \)

(d) \(e_0=e+C_s log_{10} \frac{σ’}{σ’_0} \)

I have been asked this question in exam.

I need to ask this question from Consolidation Process in division One Dimensional Consolidation of Geotechnical Engineering I

Answer 1

Correct choice is (d) \(e_0=e+C_s log_{10} \frac{σ’}{σ’_0} \)

Explanation: The expansion curve is a fairly straight line on semi log plot and its expression is given by,

\(e_0=e+C_s log_{10} \frac{σ’}{σ’_0} \)

Where Cs=expansion or swelling index.