RESEARCH ON SUCTION PENETRATION TEST OF BUCKET FOUNDATION

Guo Wei; Li Sen; Fu Kun; Qiu Song

doi:10.19912/j.0254-0096.tynxb.2022-0182

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (6) : 406-412. DOI: 10.19912/j.0254-0096.tynxb.2022-0182

RESEARCH ON SUCTION PENETRATION TEST OF BUCKET FOUNDATION

Guo Wei^1,2, Li Sen^1,3, Fu Kun^1,3, Qiu Song^1,3

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Abstract

A suction penetration test of offshore wind farm multi-compartment bucket foundation is carried out. The pressure difference, earth pressure and structural stress are monitored during the penetration test,based on which the penetration resistance and side wall deformation are analyzed. Field test results indicate that, the maximum foundation inclination is about 1.2° in the self-weight penetration stage. After the bucket foundation being leveled at the initial stage of suction penetration, the foundation no longer tilts significantly. For steel bucket foundations in muddy soil, the theoretical pressure difference calculated based on cone penetration test （CPT） data with upper bound value of resistance coefficient used in calculation is the closest to the measured result. A sidewall friction coefficient of 0.23 is obtained based on the measured earth pressure. The structure stress monitoring results of the bucket foundation during construction period indicates that the maximum stress occurs at the bucket top plate, and the side wall deflects significantly as a result of the pressure difference. Based on the phenomenon that the water pressure in the compartments are basically consistent during the suction penetration stage, a sensor layout scheme is proposed, in which the stress gauge is arranged on the compartment plate to avoid the influence of difference between internal and external pressures.

Key words

offshore wind power / foundations / stress monitoring / soil resistance / suction penetration

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Guo Wei, Li Sen, Fu Kun, Qiu Song. RESEARCH ON SUCTION PENETRATION TEST OF BUCKET FOUNDATION[J]. Acta Energiae Solaris Sinica. 2023, 44(6): 406-412 https://doi.org/10.19912/j.0254-0096.tynxb.2022-0182

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