Environmental Engineering Reference
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100
Sand
Clay
Silt
80
60
40
20
0
0.0001
0.001
0.01
0.1
1
10
100
Particle size, mm
Particle-size log PDF
Fredlund unimodal
Experimental
USCS (United Soil Classification System)
Figure 2.7
Grain-size distribution data fit with unimodal equation for silty sand along with
logarithmic PDF (from M.D. Fredlund et al., 2000).
100
80
60
a
gr
= 0.1
a
gr
= 1
a
gr
= 10
40
20
0
0.001
0.01
0.1
1
10
100
Particle size, mm
Figure 2.8
Effect of varying
a
gr
parameter on grain-size distribution curve (from M.D. Fredlund
et al., 2000).
100
80
60
40
20
0
0.001
0.01
0.1
1
10
100
Particle size, mm
Figure 2.9
Effect of varying
n
gr
parameter while holding other parameters constant;
a
gr
=
1
.
0,
m
gr
=
0
.
5,
d
r,
gr
=
1000, and
d
m
=
0
.
001 (from M.D. Fredlund et al., 2000).
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