UFC 3-220-01N
15 AUGUST 2005
machine vibration problems is a function of the geometry of the problem rather than of
the physical properties of the soil.
Table 12-4 Values of Constant η Used with Equation (12-23) to Estimate
Cyclic Shear Modulus at Low Strains
Plasticity Index
K
0
0
20
0.18
40
0.30
60
0.41
80
0.48
≥ 100
0.50
(Courtesy of O. Hardin and P. Drnevich, "Shear Modulus and
Damping in Soils: Design Equations and Curves," Journal Soil
Mechanics and Foundations Division, Vol 98, No. SM7, 1972, pp 667-
692. Reprinted by permission of American Society of Civil Engineers,
New York.)
12-21
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