Evaluating the p - y Curve Method of Analysis for Large-Diameter Monopiles Using Centrifuge Modelling
Evaluating the p - y Curve Method of Analysis for Large-Diameter Monopiles Using Centrifuge Modelling
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使用离心机模型评估大直径单桩的 p-y 曲线分析方法
DOI：
10.1061/9780784480137.040
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Bayton S
中科院分区：
文献类型：
--
作者：
Bayton S
采用离心模型试验研究了海上风力机单桩基础在横向荷载作用下的结构响应。模型单桩基础试验在直径5m (D)的原型桩100重力（100g）下进行。在不断增加的单调侧向荷载作用下，对20 m、30 m和40 m 3种埋置深度（L/D= 4,6和8）进行了评价。监测了桩顶挠度、侧力和相应的桩弯矩的演变。对实测和预测的挠曲形状和桩身弯矩的比较表明，设计规范的分析方法可能低估了这两个参数高达30%。此外，卸载后，单桩会经历一定程度的“锁定”力矩，这表明在初始加载过程中，由于弯曲主轴上的砂粒重组，水平约束增加。
Centrifuge model tests were performed to evaluate the structural response of offshore wind turbine monopile foundations in sand subjected to lateral loading. Model monopile foundation tests were performed at 100 gravities (100g) of a prototype pile 5 m in diameter (D). Three embedment depths (L) of 20 m, 30 m and 40 m (L/D= 4, 6 and 8) were evaluated under an increasing monotonic lateral load. Evolution of pile head deflection, lateral force and consequential pile bending moments were monitored. Comparison of the observed and predicted deflected shape and pile bending moments indicates that the design codesp – ymethods of analysis may underestimate the two parameters by up to 30 percent. Additionally, upon unloading, the monopile experiences a degree of ‘locked-in’ moment, which suggests an increase in horizontal restraint due to sand particle restructuring in the principle axis of bending during the initial load application.