Organic soils are typically characterized by high void ratio, low specific gravity, and high compressibility. Following are the results of a consolidation test on a sample of organic soil obtained from southwest Florida.
Pressure, σ' (kN/m2) Change in dial reading, ΔH (mm)
6 ..............................................0.284
12.............................................0.150
24.............................................0.315
48.............................................0.564
100............................................0.823
200.............................................2.25
400.............................................5.34
Given that the initial height of the specimen = 20.6 mm, mass of dry specimen = 12 g, area of specimen = 31.67 cm2, and Gs = 2.49,
a. Plot the e-log σ' curve.
b. Determine the preconsolidation pressure.
c. Calculate the compression index, Cc