Plot the following data and determine the preconsolidation pressure and the modified compression index. Specimen height is 25.4 mm, wn = 32.5%, d = 1.45

Plot the following data and determine the preconsolidation pressure and the modified compression index. Specimen height is 25.4 mm, wn = 32.5%, ρd = 1.45 Mg/m3. Sample is from a depth of -11.5 m.

% Strain.....................................Pressure (kPa)

0.09........................................... 5

0.11........................................... 10

0.12........................................... 20

0.26........................................... 40

0.98........................................... 80

1.91........................................... 160

4.19........................................... 320

8.05........................................... 640

8.03........................................... 320

7.83........................................... 160

7.21........................................... 80

7.34........................................... 160

7.60........................................... 320

8.35........................................... 640

12.65.......................................... 1280

17.41...........................................2560

22.18........................................... 5120

21.65........................................... 1280

20.63........................................... 160

19.26........................................... 40

15.35........................................... 5

Effective Stress (kPa) 10 100 1000 10000 0.00 5.00 10.00 15.00 20.00 25.00 Percent Strain