p-y曲线能够反映桩土非线性特征,是API,DNV等规范推荐的一类桩-土相互作用分析方法,其计算公式是根据现场试桩数据归纳所得,但多为3m直径以内的试桩,对于直径4～6m甚至更大的海上风电单桩基础结构而言,p-y曲线法的适用性值得商榷.然而,直接针对这类大直径单桩进行现场试验来获取p-y曲线并对规范推荐公式进行验证或修正难度较大,为此,采用数值仿真技术,通过有限元模拟,对p-y曲线法的适用性进行了计算和分析.结果表明,规范给出的p-y曲线用于海上风电大直径钢管桩桩-土仿真分析误差较大.%As a method that can describe the non-linear characteristics of pile-soil, the p-y method is recommended by some codes (API, DNV, etc.) for pile-soil interaction analysis. Hie recommended p-y curve formulations are based on the results of lateral load test on instrumented piles with diameter less than or equal to 3 m, but for the monopile with diameter of 4-6 m or even more used in the offshore wind farms, the suitability of p-y method needs to be proved. Because it is hard to obtain the real p-y curve or prove the recommended p-y curve through in-situ test for large-diameter piles, the numerical simulation is used to analyze the suitability of p-y method.The simulation results show that it is unreasonable to use the recommended p-y curves for pile-soil interaction analysis of large-diameter monopile.
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