冲刷对海上风力机单桩基础水平承载特性的影响
Effects of scour on horizontal bearing behavior of monopile foundations for offshore wind turbines
查看参考文献32篇
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文摘
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大直径单桩是用于海上风力机的一种典型基础形式.波浪与海流引起的桩基冲刷会削弱桩基的承载能力而危及结构安全.本文建立了模拟桩基与土体相互作用的三维有限元数值模型,并用试验结果对模型进行了验证.基于数值计算结果获得了一系列典型砂土及桩基参数下的桩土相互作用p-y曲线,拟合得到适用于砂土的大直径单桩基础p-y曲线参数化表达式.冲刷所致的桩基埋深变化可导致桩基变形向刚性桩模式转变.数值分析结果表明,刚性桩变形模式下桩基底面和桩基侧壁切向的土阻力对桩基承载力产生重要影响,而目前仅考虑桩土间水平作用力的p-y曲线法所预测的桩基变形偏大.对于距冲刷后泥面同一深度处的土体,p-y曲线的斜率随着局部冲刷深度的增加而逐渐增大,变化规律与基于离心机实验结果一致.随着冲刷坡角的减小,局部冲刷坑周围土体对桩基的约束逐渐弱化,p-y曲线修正方法中参数f的取值也逐渐减小. |
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其他语种文摘
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Monopile is widely used as a typical foundation for offshore wind turbines (OWT). Local scour usually occurs around offshore pile foundations, which may bring the reduction of both the effective stresses in the surrounding soil and the effective pile embedment. Until now, the effects of local scour on the lateral pile-soil interaction have not been well understood. In this study, a three-dimensional finite element model for the lateral pile-soil interaction is proposed and verified with experimental results. The p-y curves describing the pile-soil interaction are extracted from a series of numerical results with various sandy soil conditions and pile parameters. A parameterized expression of the p-y curves for large-diameter monopile in sand is proposed. The results indicate that scour could induce a significant transition of pile behavior for a monopile typically employed for OWT. If the pile exhibits rigid structural behaviors after scour, the pile’s tip and shaft resistance may become a significant component of the whole soil resistance, which would render the traditional p-y approach inapplicable. For a given depth below the scour base, the p-y curves get significantly stiffer with increasing scour depth, especially at relatively shallow depths. The scour effects on the variation of p-y curves from the present numerical results are generally consistent with the existing centrifuge results. As the slope angle of scour holes decreases, the effect of the remaining sloping overburden soil above the level of the scour base reduces and the stiffening of the p-y curves at a given depth below the scour base is correspondingly alleviated. |
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来源
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中国科学. 物理学
, 力学, 天文学,2016,46(12):124710-1-124710-10 【核心库】
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DOI
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10.1360/SSPMA2016-00295
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关键词
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单桩基础
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冲刷
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p-y曲线
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砂土
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地址
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中国科学院力学研究所, 中国科学院流固耦合系统力学重点实验室, 北京, 100190
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1674-7275 |
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学科
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建筑科学 |
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基金
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国家自然科学基金
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国家973计划
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文献收藏号
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CSCD:5857920
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