Abstract
Effects of undrained cyclic stress-strain history on clay behavior were studied by cyclic triaxial compression tests. An apparently-overconsolidated clay produced by undrained cyclic loading decreases its undrained strength because of the decrease in effective stress in clay. while a clay subjected to drained cyclic loading gains the strength similarly to the long-termed consolidated clay. Undrained strengths of a reconstituted marine soft clay were predicted by a method which was formerly extended from the empirical relation existing between overconsolidated and normally-consolidated clays. In terms of the effective stress analysis, the critical state parameter in clay has nothing to do with undrained cyclic loading histories.
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