This study focuses on the case study of Changhua offshore wind farm with using two different models to simulate the behavior of soil-pile interaction of liquefiable seabed sand. Two ways are used to modify the p-y curve due to excess pore water pressure induced by seismic vibration. They are Liu and Dobry method and Chang and Hutchinson method. These two methods enable a more reasonable assessment of pile-soil interaction in the liquefiable seabed sand under the various level of weakening effect excited by excess pore water pressure using different modified p-y curves. According to results analyzed, using Chang and Hutchinson method is essentially more reasonable. However, using Chang and Hutchinson method will overestimate soil resistance as ru less than 0.2. Therefore, the Liu and Dobry method is suggested to modify the p-y curve as ru less than 0.2. Also, the effect of diameter of the pile on the behavior of pile is studied and discussed.
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