CENTRIFUGE SHAKING TABLE TEST ON SINGLE PILE IN LATERAL SPREADING SOIL

Dynamic centrifuge model tests on single pile foundation in sloping liquefiable ground were conducted to investigate the behavior of pile foundations in liquefiable soil during earthquakes.Acceleration and excess pore pressure of the foundation and moment of the pile were measured and recorded during the test.Test results showed the top of the ground liquefied and excess pore pressure patterns varied with the depth.Upon liquefaction,soil filtered out high frequency contents of the earthquake,reducing the maximum acceleration of the earthquake.The maximum moment of the pile occurred after initial liquefaction at the pile head.Relatively large residual moment was observed in the pile after the excitation.These results indicate that the response of piles varies in the three different stages including pre-liquefaction,post-liquefaction and lateral ground displacement after earthquakes,and further studies should consider these differences.This research enhanced the understanding of pile responses during earthquake,and would provide basis for further investigation into the soil-pile-structure interaction mechanism in liquefiable soil.