因土地成本愈趨昂貴，海上風力發電已成為各國綠色能源發展重點研究之一，設計出足以承受海上惡劣環境影響的基礎設施，是為海上風力發電安全運轉的條件。大口徑單樁基礎(monopile)是海上風力發電機普遍採用的基礎型式之一，然而海域環境中之樁基礎周圍因受海流及波浪作用造成大口徑單樁基礎鄰近的海床淘刷，使基礎埋置深度減少，降低基礎的承載力，影響整體安全性。
本研究係利用PLAXIS與APILE兩種分析程式建立單樁基礎模型，分析單樁基礎埋至在緊密砂土時，受到軸向載重作用後之影響進行比較，當APILE無法完全考量大口徑單樁基礎之行為時，可利用有限元素模型來分析大口徑單樁基礎受力行為，且將淘刷坑幾何形狀考慮在數值模型中，能更準確模擬大口徑單樁基礎周圍海床受淘刷時之情形。

The development of green power focus on the offshore wind turbine because the cost of land is much higher. To design of the foundation which can maintain the stability of wind turbine in the harsh offshore environments is important. Monopiles are used as foundation structures for offshore wind energy towers, which are open-ended steel pipe piles with large diameters. For a pile foundation, the scour caused by wave and current lead to the reduction of embedded pile length and may decrease the lateral resistance.
This study is used the program PLAXIS and APILE to generate the model on the deformation response of monopile foundation embedded in sandy soil under axial loading. The behavior of a large-diameter monopole is simulated by the finite element model instead of APILE. And numerical models take the geometry of scour hole into account can accurately simulate the behavior of a monopile with a scour in sandy soil.

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