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<p>Owing to the insufficient bearing capacity of monopile foundations in the deep sea, pile–bucket foundations, which consist of a traditional monopile and a wide-shallow bucket and can effectively improve lateral performance, are receiving increasing attention. This paper describes the results obtained from a large-scale model testing campaign on laterally loaded pile–bucket foundations in clay. The results obtained from monotonic tests performed on pile–bucket foundations with three different bucket sizes are presented, and a monopile is used as a comparison. The pile–soil interaction was investigated in terms of the overall load–displacement behavior, distribution of the bending moment, pile (bucket) deflection, net soil resistance, and <i>p</i>–<i>y</i> curves. The monotonic test results show that with the addition of the bucket, the ultimate bearing capacity and initial stiffness of the hybrid foundation obviously increase. Compared with that of the monopile foundation, the displacement at the mud surface of the hybrid foundation is 80–90% lower under the same load, and the peak soil resistance of the hybrid foundation is approximately 12–15 times greater than that of the monopile foundation. Furthermore, supplementary 3D FEM analyses were also performed to reveal the foundation failure mode and soil flow mechanism of pile–bucket foundations. This study provides design references for further practical applications of hybrid foundations.</p>

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Large-scale model tests of monotonic response of lateral loaded hybrid pile–bucket foundation in unsaturated clay

  • 期刊论文

  • 发表日期：

    2025年7月29日

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  • Haoran OuYang,
  • Zhiyu Gong,
  • Chonglin Dai,
  • Wei Qin,
  • Weiming Gong,
  • Guoliang Dai

摘要

Owing to the insufficient bearing capacity of monopile foundations in the deep sea, pile–bucket foundations, which consist of a traditional monopile and a wide-shallow bucket and can effectively improve lateral performance, are receiving increasing attention. This paper describes the results obtained from a large-scale model testing campaign on laterally loaded pile–bucket foundations in clay. The results obtained from monotonic tests performed on pile–bucket foundations with three different bucket sizes are presented, and a monopile is used as a comparison. The pile–soil interaction was investigated in terms of the overall load–displacement behavior, distribution of the bending moment, pile (bucket) deflection, net soil resistance, and p–y curves. The monotonic test results show that with the addition of the bucket, the ultimate bearing capacity and initial stiffness of the hybrid foundation obviously increase. Compared with that of the monopile foundation, the displacement at the mud surface of the hybrid foundation is 80–90% lower under the same load, and the peak soil resistance of the hybrid foundation is approximately 12–15 times greater than that of the monopile foundation. Furthermore, supplementary 3D FEM analyses were also performed to reveal the foundation failure mode and soil flow mechanism of pile–bucket foundations. This study provides design references for further practical applications of hybrid foundations.