基于数值模拟的海上风电大直径桩桩土相互作用研究

摘要

As a method that can describe the non-linear characteristics of pile-soil, the p-y curve method is widely used for the analysis of laterally loaded piles. Because the 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, the suitability of p-y method for the monopile with diameter of 4-6 m or even more used in offshore wind farms needs to be proved. The simulated data are processed and analyzed, then using the finite element software of ABAQUS and SACS to analyze the monopile with a diameter of 6.2 m. Through the comparative analysis of examples, the validity and applicability of the simulated data are proved. The simulation results show that the p-y curves recommended by standards is more safe.%p-y曲线能够反映桩土非线性特征，是分析水平受荷桩常采用的方法。但现场多为3m以内的试桩，对于4~6m甚至更大的海上风电单桩基础结构而言，其适用性值得商榷。为此，采用数值仿真技术对海上风电基础结构大直径钢管桩现场试桩试验进行了有限元数值模拟，分别采用ABAQUS和SACS软件对6.2 m直径桩进行了对比分析，证明了数值实验得到的大直径桩p-y数据的有效性；并将数值实验得到大直径桩p-y数据通过软件SACS与规范推荐的p-y曲线计算结果进行对比，结果表明，规范推荐的p-y曲线偏安全。