海上风电大直径加翼桩水平承载性能研究

为改善海上风电大直径钢管桩的水平承载性能,基于ABAQUS有限元软件对单桩改进形式的加翼桩结构进行了系统研究,计算分析了软黏土地基中加翼桩在水平荷载作用下桩身弯矩、应力、位移、桩身泥面处倾斜率和极限承载力,研究了加翼桩面积、形状、埋深和刚度等翼板参数对加翼桩水平承载性能的影响规律,根据加翼桩的桩-土作用机理,参考现行规范模式提出适用于软黏土地基大直径钢管桩的P-Y曲线。研究结果表明,加翼桩通过在泥面处设置翼板可降低桩基泥面处倾斜率50%、提高桩基极限承载力60%以上,加翼桩水平承载性能明显优于单桩。

Study on horizontal bearing capacity of large diameter wing-monopile of offshore wind turbine

In order to improve the horizontal bearing capacity of large diameter steel pipe pile of offshore wind turbine, the structure of wing monopile was studied systematically based on ABAQUS finite element method. The horizontal bearing performance of wing-monopile in soft clay foundation was analyzed under the horizontal load, including the bending moment, stress, displacement, inclination rates of pile at mud surface and ultimate bearing capacity. In addition, the influence of the area, shape, stiffness and buried depth of the wing plate on the horizontal bearing capacity of the wing-monopile was studied. According to the mechanism of soil-pile interaction, the P-Y curve of the large-diameter monopile in soft clay foundation was proposed by referring to the P-Y curve model of the current specification. The results show that the wing-monopile with wing plates on mud surface can reduce the inclination rates of pile at mud surface by 50% and increase the ultimate bearing capacity more than 60% than monopile. With higher horizontal bearing capacity than monopile, the wing-monopile can be widely used in the future.