Nature and Phase Properties of Unsaturated Soil - Unsaturated Soil Mechanics in Engineering Practice - page 41

100

Clay Silt Sand

80

60

40

20

0

0.0001 0.001 0.01 0.1 1 10 100

Particle size, mm

Experimental
Particle-size log PDF
Fredlund bimodal

Figure 2.13 Fitting gap-graded clayey silt sand with bimodal equation along with its logarithmic
PDF (from M.D. Fredlund et al., 2000).

100

80

60

Sand

40

20 Silt

Clay

0

0.00001 0.0001 0.001 0.01 0.1 1 10 100

Particle size, mm

Figure 2.14 Determination of soil-size fractions (i.e., % clay, % silt, and % sand) according to
USCS (from M.D. Fredlund et al., 2000).

100

80

d 60

60

d 50

40

d 30

d 20

20

d 10

0

0.00001

0.0001 0.001 0.01 0.1 1 10 100

Particle size, mm

Figure 2.15 Determination of percent passing for selected particle sizes, d( from M.D. Fredlund

et al., 2000).