Cyclic Response and Post-cyclic Settlement of Sand Experiencing Repeated Earthquakes

초록

This study evaluated the cyclic response and re-consolidation volumetric strain (epsilon(V)) of clean sand subjected to repeated earthquakes at non-fully liquefied stage. A series of repeated cyclic direct simple shear tests (CDSS) at various cyclic stress ratios (CSR) and followed re-consolidation phases were performed on loose sand. From the experimental results, CSR, number of applied shear event, shear strain induced by shaking event were factors influencing the cyclic behavior and epsilon(V). For non-liquefied samples subjected to repeated shear events, two concepts of maximum double amplitude shear strain (gamma(DA) max) and evolution of double amplitude shear strain (Delta gamma(E)DA) in relation to epsilon(V) were examined, in which (Delta gamma(E)DA - epsilon(V)) concept exhibited a better correlation and was suggested as an alternative approach for examining the dynamic response during shaking events induced by earthquakes.

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