Table 8-3.1 Typical Engineering Properties of Compacted Materialsa
Typical Value of
Compression
(Percent of
Original Height)
Range of
Typical Strength Characteristics
Range of
Typical
Range of
Range of
Maximum
Optimum
Coefficient
CBR
Subgrade
At 138
At 345
Cohesion
Cohesion
Effective
Dry Unit
Water,
of
Values
Modulus k
kPa
kPa
(as
(saturated)
Stress
Weight,
Content
Permeability
kPa/mm
Group
Soil Type
(20
(50 psi)
compacted)
psf
Envelope
gm/cm3
Percent
cm/sec
(lb/cu in)
Symbol
psi)
psf
deg
(pcf)
(ft/min)
2.5 x 10-2
GW
Well
2.00-2.16
11-8
0.3
0.6
0
0
>38
40-80
81-136
(5x10-2)
graded,clean
(125-135)
(300-500)
gravels,
gravel-sand
mixtures
5 x 10-2
GP
Poorly
30-60
68-108
1.84-2.00
14-11
0.4
0.9
0
0
>37
(10-1)
graded clean
(250-400)
(115-125)
gravel-sand
mix
>5 x 10-7
GM
Silty gravels,
20-60
27-108
1.92-2.16
12-8
0.5
1.1
-----
-----
>34
(>10-6)
poorly graded
(100-400)
(120-135)
gravel-sand-
silt
>5 x 10-8
GC
Clayey
20-40
27-81
1.84-2.08
14-9
0.7
1.6
-----
-----
>31
(>10-7)
gravels,
(100-300)
(115-130)
poorly graded
gravel-sand-
clay
5 x 10-4
SW
Well graded
20-40
54-81
1.76-2.08
16-9
0.6
1.2
0
0
38
(>10-3)
clean sands,
(200-300)
(110-130)
gravelly
sands
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