Abstract
Constant rate of strain (CRS) consolidation tests were conducted for undisturbed Ariake clay samples from three boreholes in Saga Plain of Kyushu Island, Japan. The coefficients of consolidation () were interpreted from the CRS test results by small- and large-strain theory. Large-strain theory was found to interpret smaller values and less strain rate effect on than that by small-strain theory. Comparing the theoretical strain distributions within a soil specimen to those obtained by numerical simulation shows that the small-strain theory can be used only for the dimensionless parameter (where is strain rate and is the specimen height), and the large-strain theory can be used for a larger range of strain rates. Applying the criterion to undisturbed Ariake clay with a value of about , it is suggested that the large-strain theory should be adopted for calculating the value when > 0.03%/min.
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