相較陸上風機，離岸風機在設計基礎時需特別注重因風力、波浪以及海流外力等側向力對問題，再加上台灣離岸土層較為軟弱，地震頻繁以致土壤多具液化潛勢等因素，對基樁側向抵抗力要求更高。本文主要研究基樁在較深層土壤液化時，利用LPILE Plus v5.0以及GROUP 7.0 程式模擬不同程度地震引發土壤液化後基樁與土壤之間的互制行為，並且以台灣福海離岸風場之風機二號土層資料為實例分析。將以往學者提出之土壤液化時產生的超額孔隙水壓比對p-y曲線修正方法應用至現地土層，配合現今台灣《建築物基礎構造設計規範》中對液化地盤設計要求，並嘗試提出新的p-y曲線修正法來比較基樁在不同修正法之樁身位移、旋轉角變量與最大彎矩值，以及超額孔隙水壓比之靈敏度選用對基樁分析之影響誤差，有助日後於液化土層設計側向樁基礎和對制定液化土層中耐震基礎設計規範。

As the weak soil layer of Taiwan offshore region is easily to be liquefied induced by earthquake and also lateral forces such as wind, wave and ocean current, the foundation of offshore wind turbine in Taiwan should provide enough lateral force resistant. This study analyzed the change of pile body deflection, maximum rotation angle and moment by using various p-y curved modified method combined with the specification of foundation design issued in Taiwan. Further practical study is to simulate the interaction of pile and liquefied soil layer under turbine No.2 in Changhua Fuhai offshore wind farm in Taiwan. In addition, by using Chang, Shu-Yu (2015) excess pore water ratio modifying method as reference, a new modified method is established in this study. This method is able to simulate the behavior of pile under a great depth of liquefied soil layer reasonably.

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