一般離岸風機基座建置時需考量風力、波浪與海流外力作用下所引起之基樁受力及震動問題，加上台灣受限於近海土層較軟弱、尚乏海上大口徑單樁施作能力、考量颱風與地震作用力以及土壤具液化潛勢等因素，海下群樁基礎為較適合之基座。本研究將以台灣福海離岸風場之風機二號土層為主要研究內容，利用GROUP基樁程式模擬海床砂土與基樁間互制的行為，分析基樁之樁身位移、彎矩值、最大旋轉角隨深度之變化情形，並且考慮海床砂土可能液化之情形，進行離岸群樁基礎在可液化土層之分析，建構土壤完全液化或部分土壤液化之p-y曲線模式。研究方式是以超額孔隙水壓比參考因子，提供兩種超額孔隙水壓修正法修正土壤液化後之p-y曲線，兩者分別為Liu和Dobry修正法(1995)與Chang和Hutchinson修正法(2013)，並設法將上述兩種修正法合併使用，提供一個更完整的修正法來描述海床砂土p-y曲線從無液化到完全液化的過程。分析之結果顯示以上述修正法修正後之p-y曲線，能合理地模擬海床砂土之樁土間互制的行為。

External forces such as wind, wave, and ocean current are factors to be considered during the installation of offshore wind turbine foundation. Limited by the weak soil layer of Taiwan offshore region and the lack of monopole construction capability, plus the consideration of typhoon, earthquake, and potential of soil liquefaction, submerged group pile foundation is believed to be the most suitable option. This study analyzed the change of pile body displacement, moment, and the maximum angle of rotation with depth by using GROUP 2013 software to simulate the interaction between seabed sand and pile foundation using data obtained from soil layer under turbine No.2 in Changhua Fuhai offshore wind farm in Taiwan. Fully and partially liquefied p-y curves were established by analyzing offshore group pile installed in liquefiable soil. By using excess pore water pressure ratio as reference, two excess pore water pressure modifying methods, Liu and Dobry (1995) and Chang and Hutchinson (2013), were selected to correct the p-y curve after soil liquefaction. The two modifying methods were combined to provide a more complete method to describe the process from sand non-liquefied to completely sand liquefied. The analyzing result shows that p-y curves modified by this method are able to simulate the interaction between soil and pile body more reasonably.

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