Table 8-1.4
Typical Properties of Compacted Soils
Group
Soil
Range of
Range of
Typical
Range of
Typical Strength Characteristics
Typical
Range
Symbol
Type
Maximum
Optimum
Value of
Subgrade
Coefficient
of
Dry Unit
Moisture,
Compression
Modulus
of
CBR
Weight,
Percent
k
Permeability
Values
At
At
Cohesion
Effective
Cohesion
Tan
gm/cm3
gm/cm3
cm/min
134
(Saturated)
345
Stress
(as
(lbs/ft3)
(lbs/ft3)
(ft/min)
kPa
kPa
kPa
Envelope
Compacted)
(lb/ft2 )
(1.4
(3.6
Deg
kPa
(lb/ft2 )
tsf)
tsf)
3 x 10-2
SW
Well
20
5,500
1.762
16 9
0.6
1.2
0
0
38
0.79
graded
40
8,300
2.082
(>10-3)
clean
(200
(110
sands,
300)
130)
gravelly
sands
3 x 10-2
SP
Poorly
10
5,500
1.602
21 12
0.8
1.4
0
0
37
0.74
graded
40
8,300
1.922
(>10-3)
clean
(200
(100
sands,
300)
120)
sand
gravel
mix
1.5 x 10-3
SM
Silty
10
5,500
1.762
16 11
0.8
1.6
50 (1050)
20 (420)
34
0.67
soils,
40
8,300
2.002
(>5 x > 10-5)
poorly
(200
(110
graded
300)
125)
sand-silt
mix
>6 x 10-5
SM
Sand-
5-30
2,800
1.762
15 11
0.8
1.4
50 (1050)
14 (300)
33
0.68
(>2 x 10-6)
SC
silt clay
8,300
2.082
(100-300)
mix with
(110-
slightly
130)
plastic
fines
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