Offshore wind power has been a flourishing industry for over ten years and is the fastestgrowing renewable energy source in the world. Underwater infrastructure is fundamentally important for building offshore wind turbines (OWTs). Large-diameter monopiles are widely used foundations for OWTs and such piles usually acquire large internal soil plugs during installation. In this study, three-dimensional finite-difference analyses were performed to estimate the static vertical load-carrying capacity of a monopile embedded in the substratum at a real site. The soil plug was shown to have a large effect on frictional resistance and vertical loading capacity. P-S curve showed frictional resistance by soil plug was increasing gradually without yielding but frictional resistance by soil strata wasn’t. This appears to be caused by compression of the soil plug during vertical loading and also inflicted t-z curve out of synchronization. The effect of soil plug should be evaluated in monopile structure design.
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