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)
>2 x 10-7
SC
Clay like
5-20
2,800
-2.002
19-11
1.1
2.2
74 (1550)
11 (230)
31
0.60
sands,
8,300
(105-
(>2 x 10-7)
poorly
(100-300)
125)
graded
sand/
clay
mix.
>3 x 10-6
CL
Inorgan-
15 or
1,400
1.922
24-12
1.3
2.5
86 (1800)
13 (270)
28
0.54
(>10-7)
ic clays
less
5,500
(95-120)
(50-200)
of low to
medium
plasti-
city
OL
Organic
80-100
33-21
***
***
****
*****
***
***
***
5 or
1,400
silts and
less
2,800
silt clays
(50-100)
low
plasti-
city
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