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水平方向桶土相互作用土弹簧构建及优化研究

闫玥, 赵康, 沈泽荣, 付登锋, 闫澍旺

闫玥, 赵康, 沈泽荣, 付登锋, 闫澍旺. 水平方向桶土相互作用土弹簧构建及优化研究[J]. 岩土工程学报. DOI: 10.11779/CJGE20230502
引用本文: 闫玥, 赵康, 沈泽荣, 付登锋, 闫澍旺. 水平方向桶土相互作用土弹簧构建及优化研究[J]. 岩土工程学报. DOI: 10.11779/CJGE20230502
Research on Optimization of p-y Spring Model Applied in Bucket foundation-soil Interaction along Horizontal Direction[J]. Chinese Journal of Geotechnical Engineering. DOI: 10.11779/CJGE20230502
Citation: Research on Optimization of p-y Spring Model Applied in Bucket foundation-soil Interaction along Horizontal Direction[J]. Chinese Journal of Geotechnical Engineering. DOI: 10.11779/CJGE20230502

水平方向桶土相互作用土弹簧构建及优化研究  English Version

基金项目: 国家自然科学基金面上项目(52271290);

Research on Optimization of p-y Spring Model Applied in Bucket foundation-soil Interaction along Horizontal Direction

  • 摘要: 桶形基础作为一种新型的海洋基础型式,已逐步推广应用于海上风电开发领域,其服役的稳定性能往往与桶形基础与海洋土之间的相互作用息息相关。为高效、准确地评价桶土相互作用行为,本文以传统应用于桩基稳定性评估的p-y弹簧法为基础,通过对比三维有限元模拟结果与API规范p-y曲线,引入p-因子和y-因子双修正参数,提出了可服务于评估水平向桶土相互作用不排水行为的修正p-y弹簧法。此外,基于可有效再现土体材料非线性的NGI-ADP模型,考虑土体剪切刚度系数Gmax/su,破坏剪应变γfp等因素,对海洋常见的单层及分层黏土地质条件开展了系统化参数分析,研究发现y-因子受分层土影响显著,p-因子基于处于1.38 - 2.08区间。依托实际工程,进行了修正p-y弹簧法的应用分析,结果表明修正p-y弹簧法对实际工程场地条件具备良好适应性,最后针对部分土体工况,对多自由度下的桶土相互作用响应进行了研究。
    Abstract: As a new type of Marine foundation, barrel foundation has been gradually applied in the field of offshore wind power development. Its stable performance in service is often closely related to the interaction between barrel foundation and Marine soil. In order to evaluate the undrained behavior of bucket soil interaction efficiently and accurately, based on the traditional p-y spring method used to evaluate the stability of pile foundation, the modified p-y spring method is proposed to serve the evaluation of undrained behavior of horizontal bucket soil interaction by comparing the 3D finite element simulation results with the API standard p-y curve and introducing the p-factor and y-factor double correction parameters. In addition, based on the NGI-ADP model, which can effectively represent the nonlinearity of soil materials, a systematic parameter analysis is carried out on the geological conditions of common single-layer and stratified Marine clays, considering the soil shear stiffness coefficient Gmax/su, failure shear strain γfp and other factors. It is found that the y-factor is significantly affected by stratified soil. The p-factor is based on the range between 1.38 and 2.08. Based on the actual project, the application analysis of modified p-y spring method is carried out, and the results show that modified p-y spring method has good adaptability to the actual project site conditions,and finally the response of the barrel-soil interaction under multiple degrees of freedom is investigated for some soil conditions.
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出版历程
  • 收稿日期:  2023-06-01
  • 网络出版日期:  2025-06-25

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