Abstract
The hybrid monopile foundation attracts extensive attentions to fulfill increasing demands for offshore wind turbines. The installation method is still uncertainty to date, limiting the application of this innovative foundation in the offshore wind industry. This study conducts a series of centrifuge tests, combing with finite element models, to investigate the lateral responses of hybrid monopile foundations. Two types of pile-wheel connection modes, namely perfectly rough (PR) and perfectly smooth (PS), are studied. The replaced-friction occurs in “PS” case, representing that the absence of friction is replaced by increasing normal forces. This phenomenon leads to similar ultimate capacities between “PS” case and “Frictional” case while the underlying earth pressure is influential. Further studies are conducted to investigate the pile-wheel-soil interactions under combined vertical-horizontal loadings. The vertical load applied to the wheel in “PS” case is demonstrated to be most advantageous on the lateral capacity of a hybrid monopile foundation. The strength of underlying soil is enhanced, intensifying the pile-soil interaction. The pile is recommended to be installed firstly, with the wheel behind. The upper structure is loaded on the wheel directly. This study provides design references for the practical installation of hybrid monopile foundations in the offshore wind industry.
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