Experimental investigation of the horizontal bearing capacity of offshore wind-turbine monopiles with grouting protection against scouring

Zhang Fengpeng; Chen Xuguang; Feng TaoZhang Yangyang

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Experimental investigation of the horizontal bearing capacity of offshore wind-turbine monopiles with grouting protection against scouring

机译：Experimental investigation of the horizontal bearing capacity of offshore wind-turbine monopiles with grouting protection against scouring

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Seabed scouring can uncover the buried component of wind-turbine monopiles and this reduces their horizontal bearing capacity. Because rigid piles with large diameters and low slenderness ratios have been widely used in offshore wind farms, there is an urgent need to address this issue. In this study, grouting protection, as a new countermeasure against scouring, was examined, with scouring tests under constant-current, regular-wave, and combined wave-current conditions being conducted, along with static and cyclic load tests on the monopile. The scouring characteristics and horizontal bearing behaviours of a pile with grouting protection (Pile a) and a pile without grouting protection (Pile b) were investigated. We found that the ultimate scouring depths of piles with grouting were much lower than those without under constant-current scouring, regular-wave scouring, and combined wave-current scouring. The H L2D & gamma;& PRIME; -y0 D and p-y curves of the piles were obtained, which showed that grouting protection can significantly strengthen the ultimate horizontal bearing capacity under a static loading. The pile with grouting was more stable under cyclic load compared to the pile without grouting. There are two explanations for the strengthening of the horizontal bearing behaviours of piles with grouting protection. First, grouting lessens the loss of pile burial depth brought about by scouring. Second, grouted seabed has a much higher sediment stiffness than ungrouted seabed, thus the grout dramatically increases the strength of the pile- sediment structure.

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来源
《Ocean engineering》 |2023年第2期|1.1-1.14|共14页
作者
Zhang Fengpeng; Chen Xuguang; Feng TaoZhang Yangyang;
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作者单位

Ocean Univ China;

Ocean Univ China||Ocean Univ China;

Water Resources Dept Linyi;

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原文格式 PDF
正文语种英语
中图分类
关键词
Scouring; Stiff pile; Scouring protection; Grouting protection; Horizontal bearing capacity; p -y curve;

Experimental investigation of the horizontal bearing capacity of offshore wind-turbine monopiles with grouting protection against scouring

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