In order to investigate the effects of overconsolidation and cyclic prestrain history on the relationship between penetration resistance
qt and liquefaction strength
RL for sands containing fines, miniature cone penetration tests and subsequent cyclic loading tests are carried out in triaxial test specimens. A unique line relating cone resistance and liquefaction strength has been found irrespective of fines content
Fc for sands with given overconsolidation stress/prestrain history, indicating that the history tends to increase the liquefaction strength corresponding to a given
qt - value. In a comparison with similar results of accelerated tests simulating longtime cementation effect by adding small amount of cements to fines, it is clarified that a modification of
RL corresponding to
Fc in the current liquefaction potential evaluation practice cannot apply to the aging effect by overconsolidation and presstraining histories.
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