RESEARCH AND PRELIMINARY VERIFICATION OF CALCULATION METHOD FOR LOCAL SCOUR AROUND PILE FOUNDATION UNDER COMBINED ACTION OF WAVES AND CURRENT

Pan Xiaochun; Cai Shenghua; Lu Hongqian; Song Kunlin; Shu Jiaqing

doi:10.19912/j.0254-0096.tynxb.2024-1160

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (11) : 629-640. DOI: 10.19912/j.0254-0096.tynxb.2024-1160

RESEARCH AND PRELIMINARY VERIFICATION OF CALCULATION METHOD FOR LOCAL SCOUR AROUND PILE FOUNDATION UNDER COMBINED ACTION OF WAVES AND CURRENT

Pan Xiaochun, Cai Shenghua, Lu Hongqian, Song Kunlin, Shu Jiaqing

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Abstract

The existing calculation methods for local scour around pile foundation under the combined action of waves and current have some shortcomings, and there is an urgent need to develop accurate and reliable analysis and calculation methods for local scour around pile foundation under the combined action of waves and current. According to 69 sets of physical model test data on local scour around pile foundation under wave and current effects, combined with analysis of the main influencing factors of scour, dimensional analysis and multiple regression analysis were used to select variables and their coefficients. Based on the accuracy analysis of 12 sets of regression analysis results and the analysis of the impact of pile foundation scale, and considering the pier-shape coefficient for foundation scouri, a new formula for calculating the maximum local scour around pile foundation under the combined action of waves and current is developed. Research has shown that a single factor calculation formula based solely on the Froude number of pile diameter is difficult to achieve high calculation accuracy; The verification using 12 sets of publicly released measured data and 6 sets of physical model data shows that the formula in this paper is superior to Han Haiqian's wave current formula, and more significantly superior to other methods. The formula in this article is applicable for the analysis and calculation of local scour around pile foundation under the combined action of waves and current on fine and medium sandy seabed. However, in the future, it is still necessary to continuously accumulate pile scour and marine hydrological data for improvement.

Key words

offshore wind farm / pile foundation / dimensional analysis / wave and current / Froude number / local scour

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Pan Xiaochun, Cai Shenghua, Lu Hongqian, Song Kunlin, Shu Jiaqing. RESEARCH AND PRELIMINARY VERIFICATION OF CALCULATION METHOD FOR LOCAL SCOUR AROUND PILE FOUNDATION UNDER COMBINED ACTION OF WAVES AND CURRENT[J]. Acta Energiae Solaris Sinica. 2025, 46(11): 629-640 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1160

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