The following are the results of a consolidation test on a sample of a clayey soil.
E Pressure, σ' (kN/m2)
1.116........................25
1.108........................50
1.055......................100
0.962......................200
0.845......................400
0.755......................800
0.65......................1600
0.658......................800
0.675......................400
0.685......................200
a. Plot the e-log σ' curve
b. Using Casagrande's method, determine the preconsolidation pressure.
c. Calculate the compression index, Cc, and the ratio of Cs/Cc.