Evaluation of Reliquefaction Behavior of Coastal Embankment Due to Successive Earthquakes Based on Shaking Table Tests

Liquefaction caused by long-term cyclic loads in loose saturated soil can lead to ground subsidence and superstructure failures. To address this issue, study aimed emulate the liquefaction phenomenon based on a shaking table test while especially focusing behavior mechanism due reliquefaction effect. behaviors were analyzed according conditions when an embankment was located coastal ground. Silica sand used for experiment various thickness liquefiable conditions, constructed fixing height at 4 m slope ratio of 1:1.8. For seismic waves, 5 Hz sine wave excitation applied 8 s, total five excitations (cases) conducted. When upper layer consisted non-liquefiable layer, did not occur first but occurred third excitation. The results indicated that as earthquake applied, water level increased could occur. It identified even if main earthquake, aftershocks rise groundwater series earthquakes. In general design code, assessment is performed only layers below level; however, successive earthquakes occur, unexpected damage Therefore, mitigate risk embankments, it necessary evaluate under low.