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 TABLE 32
Soil Properties - Non-Cohesive Soils
Modulus of Poisson's Friction
Soil
Description
"N" elasticity ratio
factor
Type
(psi)
n[*]
f'c
Silt
Loose
4
1,000
0.40
0.4
Very Compact 30
2,000
0.30
0.8
Granular Sand
Loose
10
1,800
0.30
0.5
Very Compact 50
7,000
0.25
0.7
Gravel Loose
15
3,000
0.20
0.6
Very Compact 70 20,000
0.15
0.7
Bedrock
20,000-
0.10
0.7
50,000
[*]For soils below the water table, n = 0.50
TABLE 33
Soil Properties - Cohesive Soils
Modulus of Poisson's
Description Plasticity Condition "N" elasticity
ratio
Ad
index
(psi)
n[*]
(p
Slightly
1 - 10 Medium soft
5
2,000
0.45
Plastic
Hard
20
5,000
0.45
Plastic
10 - 20 Medium soft
4
2,000
0.45
Hard
15
6,000
0.45
Very
20+
Medium soft
3
2,000
0.45
Plastic
Hard
12
6,000
0.45
[*]For soils below the water table, n = 0.50
2.08-308
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