CVEN$30010-$ Geotechnics II

Tutorial No$.3$

The following data was obtained from a single loading increment of $50$kPa

during an oedometer test on soil sample. The sample thickness was $20mm.$

Determine the time for $90\%$ consolidation to occur $(t_{90})$ and the coefficient of

consolidation $(c_v)$ using Taylor's root time construction and the following

formula:

$c_v=\frac{0\mathrm{.}848d^2}{t_{90}}$

where: $d=$ drainage path length

Using the coefficient of consolidation $(c_v)$ calculated in Part $1$ determine the

time for $90\%$ consolidation of the $3m$ thick clay layer shown in the figure

below, where a relatively impermeable embankment is to be constructed

on top of the clay layer.

Give $2$ No$.$ examples of how the time to reach $90\%$ consolidation could be

decreased.