Abstract
Lateral flow or differential settlement caused by liquefaction results in serious damage to pavements on sandy reclaimed land in coast area. In general design procedure of port and airport facilities in Japan, a liquefaction countermeasure is applied if liquefiable sand layers exist in which the layers are thicker than 3 m and located shallower than 20 m. However, these criterions are based on an empirical rule or field investigation of past earthquakes and there is a few physical background. Moreover, it has not been systematically studied that the needs for liquefaction countermeasures when multi-liquefiable layers are existed. In present study, centrifuge modeling was conducted to simulate liquefaction and sand boiling on multi-layered sandy ground. Based on the results, conditions of occurrence of sand boiling and localized settlement were discussed. In addition, liquefaction resistance and drainage process after liquefaction of sand containing silt used in centrifuge tests were evaluated using undrained cyclic triaxial compression tests.
