Environmental Engineering Reference
In-Depth Information
TABLE 3.39
Continued
Typical Value of
Typical Strength Characteristics
Compression
Percent of Original
Height
Typical
Range of
Effective
Coefficient
Range of
Maximum
Range of
At 3.6
Stress
of
Range
Subgrade
Group
Dry Unit
Optimum
At 1.4 tsf
tsf (50
Cohesion as
Cohesion
Envelope
φ
Permeability
of CBR
Modulus
k
s
Symbol
Soil Type
Weight (pcf)
Moisture (%)
(20 psi)
psi)
Compacted (psf)
(Saturated) (psf)
(deg)
tan
φ
(ft/min)
Values
(lb/in.
3
)
SC
Clayey sands,
105-125
19-11
1.1
2.2
1550
230
31
0.60
5
10
7
5-20
100-300
poorly graded
sand-clay mix
ML
Inorganic silts
95-120
24-12
0.9
1.7
1400
190
32
0.62
10
5
15 or less 100-200
and clayey silts
ML-CL
Mixture of
100-120
22-12
1.0
2.2
1350
480
32
0.62
5
10
7
…
inorganic silt
and day
CL
Inorganic clays
95-120
24-12
1.3
2.5
1800
270
28
0.54
10
7
15 or less 50-200
of low to
medium
plasticity
OL
Organic silts
80-100
33-21
-
-
-
-
-
-
-
5 or less
50-100
and silt-days,
low plasticity
MH
Inorganic
70-95
40-24
2.0
3.8
1500
420
25
0.47
5
10
7
10 or less 50-100
clayey silts,
elastic silts
CH
Inorganic clays
75-105
38-19
2.6
3.9
2150
230
19
0.35
10
7
15 or less 50-150
of high
plasticity
OH
Organic clays
65-100
45-21
-
-
-
-
-
-
-
5 or less
25-100
and silty clays
