Question

During a consolidation test, a sample of fully saturated clay 3 cm thick is consolidated under a pressure increment of 200 kN/m2 . When equilibrium is reached, the sample thickness is reduced to 2.60 cm. The pressure is then removed and the sample is allowed to expand and absorb water. The final thickness is observed as 2.8 cm and the final moisture content is determined as 24.9%. If the specific gravity of the soil solids is 2.70, find the void ratio of the sample before and after consolidation. (Assume Vs=1)

Answer #1

Calculations are started from final stage and proceeded towards start of consolidation.

a
7m thick clay layet in the fiels drained on one side ( is normally
consolidated ) when the pressure is increased from 60 kn/m^2 to
130kn/m^2 the void ratio decreaes from 1.12 to 0.98 the hydraulic
conductivity ( cofficent of permeability ), k of clay during the
above loading range was found to be 4.3 * 10^-7 cm/sec , how long
in days will it take for clay to reach70% consolidation?

A saturated clay sample has a specific gravity of 2.72, an
initial height of 2 cm, a cross-section area of 30 cm2.
After a consolidation test, its mass becomes 109.44g, and the mass
after oven-drying is 88.44g. What is the change of its void ratio
after the consolidation test compared with that before the
test?

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