• Journal of Wind Energy
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• v.13 no.4
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• pp.70-79
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• 2022

It is difficult to control differential settlement and long-term settlement on soft ground with the template used in the pre-filing method of offshore wind power. In this study, the template adopted a suction foundation with high utility on soft ground. To analyze the penetration performance of the doughnut-type suction foundation, step-by-step numerical analysis was applied by calculating the minimum suction pressure needed for ground penetration at that depth. Scale model tests were performed and compared with the numerical analysis results. The ratio of the inside diameter compared to the outside diameter is higher, and penetration by suction was more advantageous than push-in load penetration. The step-by-step numerical analysis method showed an error within 2 % compared to the model tests, so the numerical analysis method confirmed results that the penetration performance of the doughnut-type suction foundation is valid.