Question

The slope of the e-log $\sigma$ curve for a soil mass gives

• A. coefficient of permeability, k
• B. coefficient of consolidation $C_v$
• C. compression index, $C_c$
• D. coefficient of volume compressibility, $m_v$

Answer 1

The correct option is C compression index, $C_c$

Slope of linear portion of $e-lo{g}_{10}\overline{\sigma }$ plot is called compression index and it is a dimensionless number.


$C_c=\frac{e_1-e_2}{lo{g}_{10}{\overline{\sigma }}_2-lo{g}_{10}{\overline{\sigma }}_1}$

$C_c=\frac{\Delta e}{lo{g}_{10}\left(\frac{{\overline{\sigma }}_2}{{\overline{\sigma }}_1}\right)}$