UFC 3-220-01N
15 AUGUST 2005
Figure 12-9 Idealized Cyclic Stress-Strain Loop for Soil
12-1.5.4
Correlations. Empirical correlations from many sets of data have
provided several approximate methods for estimating the S-wave velocity and shear
modulus for soils corresponding to low-strain excitation. For many undisturbed
cohesive soils and sands:
(12-23)
1230(21973 e) 2
(OCR)η (0)0.5 (pounds per square inch)
G=
1+e
where
e = void ratio
η = empirical constant, which depends on the PI of cohesive soils (table
12-4); For sands, PI = 0
and η = 0, so OCR term reduces to 1.0. For clays, the maximum
value is η = 0.5 for PI ≥ 100.
12-19
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