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An Investigation into the Effect of Scour on the Loading and Deformation Responses of Monopile Foundations

Author

Listed:
  • Wei-Chen Tseng

    (Department of Civil Engineering, National Cheng Kung University, Tainan 701, Taiwan)

  • Yu-Shu Kuo

    (Department of Hydraulic and Ocean Engineering, National Cheng Kung University, Tainan 701, Taiwan)

  • Jing-Wen Chen

    (Department of Civil Engineering, National Cheng Kung University, Tainan 701, Taiwan)

Abstract

Severe foundation scour may occur around monopile foundations of offshore wind turbines due to currents and waves. The so-called p-y curves method is suggested in the existing design recommendations to determine the behavior of monopiles unprotected against scour and the reduction of effective soil stress is accounted for by the extreme scour depth. This conservative design approach does not consider the geometry of the scour hole and the effect of pile diameter on the soil resistance. An underestimated foundation stiffness would be obtained, thereby influencing the predicted overall response of the support structure of an offshore wind turbine. In this study, we calculated the load-deformation response and foundation stiffness of a monopile when scour occurred. The influence of pile diameter on the initial modulus of subgrade reaction, and the modification of the ultimate soil resistance of a monopile subject to scour are evaluated. The commercial software BLADED was used to simulate the dynamic response of the reference offshore wind turbine with monopile unprotected against scour at Chang-Bin offshore wind farm in Taiwan Strait. The results showed that when the p-y curve suggested by existing design regulation was used to calculate the load-deformation response, the foundation stiffness was underestimated where the scour depth was greater than the pile diameter, but the foundation stiffness was overestimated when the scour depth was less than the pile diameter.

Suggested Citation

  • Wei-Chen Tseng & Yu-Shu Kuo & Jing-Wen Chen, 2017. "An Investigation into the Effect of Scour on the Loading and Deformation Responses of Monopile Foundations," Energies, MDPI, vol. 10(8), pages 1-19, August.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:8:p:1190-:d:107905
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    References listed on IDEAS

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    1. Yu-Kai Wang & Juin-Fu Chai & Yu-Wen Chang & Ti-Ying Huang & Yu-Shu Kuo, 2016. "Development of Seismic Demand for Chang-Bin Offshore Wind Farm in Taiwan Strait," Energies, MDPI, vol. 9(12), pages 1-19, December.
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    Cited by:

    1. Wei-Chen Tseng & Yu-Shu Kuo & Kung-Chun Lu & Jing-Wen Chen & Chiou-Fong Chung & Ruey-Chyi Chen, 2018. "Effect of Scour on the Natural Frequency Responses of the Meteorological Mast in the Taiwan Strait," Energies, MDPI, vol. 11(4), pages 1-18, April.

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