Abstract The influence of scour on the lateral response of monopile foundations for offshore wind turbines is investigated in this paper. Application of lateral load-displacement (p-y) curves to predict the lateral pile behaviour is subject to uncertainty as many of the presently used design approaches have been derived for long, slender piles. These piles, with typical length/diameter ratios (L/D) of greater than 10 behave differently compared to rigid monopiles, with L/D typically less than 6. In this paper, centrifuge tests are conducted on a monopile model under various scour scenarios and p-y curves are derived from strain gauges embedded along the model pile wall. Global scour and two different shapes for local scour holes are studied. Using the piecewise polynomial method for extraction of p-y curves from sparsely distributed strain measurements, it is recommended to use a 4th order polynomial for the moment profile to extract soil reaction and a 7th order polynomial for the moment profile to calculate pile deflection. Results indicate that the pile behaviour is significantly influenced by the nature (size, shape) of the scour holes affecting the pile–soil system and suggest that the p-y curves should be appropriately modified to account for this behaviour.

中文翻译：

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土工离心机中单调横向荷载作用下冲刷深度和类型对砂中单桩p-y曲线的影响

摘要 本文研究了冲刷对海上风电机组单桩基础横向响应的影响。应用侧向荷载位移 (py) 曲线来预测侧向桩行为受到不确定性的影响，因为目前使用的许多设计方法都是针对长而细长的桩推导出来的。这些桩的典型长度/直径比 (L/D) 大于 10，与刚性单桩相比，L/D 通常小于 6。 在本文中，在各种冲刷场景下对单桩模型进行离心机测试和 py 曲线来自沿模型桩壁嵌入的应变片。研究了全局冲刷和局部冲刷孔的两种不同形状。使用分段多项式方法从稀疏分布的应变测量中提取 py 曲线，建议对弯矩剖面使用 4 阶多项式来提取土壤反应，对弯矩剖面使用 7 阶多项式来计算桩挠度。结果表明，桩行为受到影响桩土系统的冲刷孔的性质（大小、形状）的显着影响，并建议应适当修改 py 曲线以解释这种行为。