離岸風力發電為我國積極推動之再生能源政策，目前規劃彰化縣芳苑鄉外海與苗栗縣竹南鎮外海為示範風場，並已於苗栗外海設置海氣象觀測塔及兩架示範風機、於彰化外海設置兩座觀測塔。由於初步規劃之潛力風場及示範場址區位鄰近於台灣保育類動物白海豚之棲息地，以負壓沉箱基礎之抽水安裝工法取代打樁可減低噪音與振動對海洋生態之衝擊，鋼材成本低且易於移除，為極具經濟效益並結合環境保育之基礎型式。
多腳負壓沉箱基礎之受力分析由於塔架幾何結構，拉拔承載力為研究重點，而為了確保沉箱順利安裝，臨界流量與吸力之關係亦需評估。本研究以1g模型試驗進行沉箱基礎受負壓吸力之安裝過程，並施加極快拉拔速率模擬基礎受極端環境載重時內部產生吸力阻抗之情況，針對數值模擬未考量之負壓安裝及吸力阻抗進行分析，試驗結果為當沉箱內部負壓趨近理論臨界值時首先發生土體膨脹抬升現象，導致沉箱無法持續下沉，且於沉箱長徑比0.5~1內，隨長徑比增大，沉箱臨界流量越低。本研究亦以不同流量安裝沉箱，比較沉箱受拉拔力之行為，結果為採用較低之安裝流量，沉箱基礎可發揮較大之極限拉拔力。僅增加內徑或裙翼長均可提高負壓沉箱之極限拉拔力及吸力阻抗，且各尺寸沉箱產生之吸力佔總拉拔力之比例約為55至60%。

Offshore wind power is becoming the important energy policy, and the wind farm will be built at western coast of Taiwan. Installed two observation towers and offshore wind turbines, the demonstration wind farm is located off the coast of Fangyuan and Zhunan township. In the case of protected animals habitat, suction bucket foundation is favorable due to low noise and vibration during installation. In recent years, suction bucket is thought to be the economical and environmentally friendly foundation.
If multipod buckets foundation supports a wind turbine, the pull-out capacity should be considered first because of the geometry. During installation, the critical suction and discharge are investigated in order to explore more effective installation techniques. In this study, 1-g model tests have been conducted and analyzed the suction which numerical model seldom considered. The test results indicate that suction buckets obtain better pull-out capacity after using lower discharge during installation in loose sand. For five aspect ratios, buckets require higher critical installed discharge with smaller H/D. In the same pull-out rate, suction resistance is around 60% of the total load for each soil density.

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