Analysis of pile behavior in liquefiable seabed sand with p-y curve approach

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 r_u less than 0.2. Therefore, the Liu and Dobry method is suggested to modify the p-y curve as r_u less than 0.2. Also, the effect of diameter of the pile on the behavior of pile is studied and discussed.