Geotechnical Engineering

DHARM

242 GEOTECHNICAL ENGINEERING

The heights of sample and the void ratios at the end of each pressure increments are
tabulated below:

Pressure in kN/m^2 Dial reading Height of sample, Void ratio

in cm H in cm

0 0.000 2.500 1.000

13 0.000 2.500 1.000

27 0.004 2.496 0.997

54 0.016 2.484 0.987

108 0.044 2.456 0.965

214 0.104 2.396 0.917

480 0.218 2.282 0.826

960 0.340 2.160 0.728

1500 0.420 2.080 0.664

Now, the pressure-void ratio curve, is drawn on a semi-logarithmic scale, the pressure
being represented on logarithmic scale as shown in Fig. 7.32.

1.00

0.95

0.90

0.85

0.80

0.75

0.70

0.65

Void ratio e

1 10 100 1000 1500 10000

Effective pressureskN/m (log scale)^2

Fig. 7.32 Pressure-void ratio diagram (Example 7.3)

(pressure to logarithmic scale)