我國離岸風電離岸風場之遴選結果已於107年4月底公布，為了確保開發時程如期商轉，許多離岸風電開發商均已規劃委託鑽探公司進行離岸風場海床土壤條件之調查，包括地球物理探測、水下文資測量及地工地質鑽探等。由於台灣西部海床土壤多屬河川沖積層延續，較歐洲國家離岸海床土壤條件軟弱，加上台灣地震及颱風頻繁，海床地層變異性高。必須更審慎評估海床土壤之勁度，以提供合理的地工設計參數供後續各項水下基礎結構設計及安裝考量。
本研究透過單軸壓縮試驗求取土壤勁度參數，包括Eoed、κ及λ，以標準砂釐清各影響因子對土壤勁度參數之影響，包括壓密時間長短、壓密速率、土壤相對密度及粒徑大小等。由於粒狀土壤之排水速度甚快，大部分之沉陷量於應力施加後之1小時內完成。透過相同條件試體，分別施加不同加載速率之應力，由實驗結果分析勁度參數，觀察得壓密時間長短及應力加載速率對土壤勁度參數之影響極小。由於相對密度直接影響土壤強度，本研究透過配置不同相對密度之粒狀土壤試體，並施以相同應力條件，分析得土壤勁度參數κ隨相對密度增加而提高，λ則隨之減少。亦透過改變粒徑大小，發現土壤勁度參數κ隨粒徑增加而增加，此成果與德國港灣技術手冊EAU(2012)建議之趨勢吻合。本研究亦以台灣西部海床現地砂進行試驗，由實驗分析結果得知，於相同之相對密度及粒徑分佈條件下，台灣西部海床土壤之κ值較標準砂之κ值小。

• The selection of offshore wind farm of Taiwan has published. To make sure the wind turbine work as expected, many developers have already commission geological boring company to investigate into seabed soil situation of wind farm. Due to seabed of western Taiwan was extension of river alluvium, it weaker than European seabed soil. Additionally, Taiwan hit by devastating earthquake and typhoon frequently, the stiffness of seabed soil should be paid more attention.
The study obtained the parameter of soil stiffness by oedometer test to clarified influence factor to soil stiffness, including duration of compression, compression rate, relative density and grain size. Due to instant drainage for granular soil, most settlement finished after 1 hour of stress application. Applying different rate of stress to same condition soil and realize that the influence of compression rate to soil stiffness is extremely small. Owing to initial relative density influence the soil strength directly, the study apply same stress situation to soil of different initial relative density then gain the trend of increasing stiffness parameter with increasing initial relative density. The trend satisfied with the suggested value of EAU (2012). The study also conducted on field sand to compare the stiffness parameter with Ottawa sand. According to result of experiment, under condition of similar grain size and initial relative density, the parameter κ of field soil would smaller than Ottawa sand.

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