LIQUEFACTION STRENGTH OF SANDS SUBJECTED TO SUSTAINED PRESSURE

概要

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Using two kinds of sands, a series of cyclic undrained triaxial tests was performed on loose and dense specimens subjected to different periods between O.1 hour and 68 days of sustained pressure. At the same time, tests on specimens over-consolidated with an OCR of two or four were performed in order to compare the effects of long-term consolidation and over-consolidation. For each sand, the strength increase after 68 days under sustained pressure was found to be equivalent to that due to over-consolidation with an OCR of about two. It was further found that for each sand the strength increase due to long-term consolidation and over-consolidation was found to be a similar function of the plastic axial strain which had occurred during each consolidation history. This result suggests that the strength increase by these different consolidation histories is due to a similar mechanism. It was also found that strength increase due to either long-term consolidation or over-consolidation was larger for the sand including some fines than the other clean sand.
社団法人地盤工学会の論文
1988-03-15