A consolidation test is performed on the specimen with these characteristics:

Height of specimen = 37.60 mm

Area of specimen = 90.1 cm2

Wet weight of specimen = 645.3 g

Dry weight of specimen = 491.2 g

Density of solids = 2.72 Mg/m3

The consolidation data (after A. Casagrande) are summarized in Table P9.15.

(a) Plot the effective stress versus void ratio curve for both arithmetic and semilogarithmic scales.

(b) Estimate the preconsolidation pressure.

(c) Compute the compression index for virgin consolidation.

(d) Plot the time curve for the load increment from 256 to 512 kg for both arithmetic and semilogarithmic scales.

(e) Compute the coefficient of compressibility av, the coefficient of permeability, and the coefficient of consolidation cv, for the load increment from 256 kg to 512 kg.

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TABLE P9.15 Consolidation Test Data Load (kg) Temp. (°C) Date Time Elapsed Time (min) Deformation (mm) 5/16/08 0.772 16 32 1.161 1.839 64 128 2.881 256 4.189 0933 23.0 5/22/08 512 Sudden 4.290 0.10 4.328 1.00 4.445 4.00 4.648 10.00 4.875 28- 5.220 72- 5.466 182– 5.583 22.7 1733 2240 480- 5.654 22.6 5.685 5/23/08 1055 5.715 23.4 22.8 5/24/08 5.738 1100 5/24/08 1024 7.351 5/30/08 1024 7.432 512 256 7.224 6.934 128 6.597 32 5.863 6/7/08 0.27 4.105 6/30/08 0.27 3.678