4.7 Article

Dynamic Impedances of Offshore Rock-Socketed Monopiles

Journal

Publisher

MDPI
DOI: 10.3390/jmse7050134

Keywords

rock-socketed piles; monopiles; impedances; dynamic responses; offshore wind turbines

Funding

  1. National Natural Science Foundation of China [51879097]
  2. Fundamental Research Funds for the Central Universities [2018B12714]

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With the development of offshore wind energy in China, more and more offshore wind turbines are being constructed in rock-based sea areas. However, the large diameter and thin-walled steel rock-socketed monopiles are very scarce at present, and both the construction and design are very difficult. For the design, the dynamic safety during the whole lifetime of the wind turbine is difficult to guarantee. Dynamic safety of a turbine is mostly controlled by the dynamic impedances of the rock-socketed monopile, which are still not well understood. How to choose the appropriate impedances of the socketed monopiles so that the wind turbines will neither resonant nor be too conservative is the main problem. Based on a numerical model in this study, the accurate impedances are obtained for different frequencies of excitation, different soil and rock parameters, and different rock-socketed lengths. The dynamic stiffness of monopile increases, while the radiative damping decreases as rock-socketed depth increases. When the weathering degree of rock increases, the dynamic stiffness of the monopile decreases, while the radiative damping increases.

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