海上风机基础大直径加翼单桩常重力模型试验研究

1g-model test of large diameter monopile with wings for offshore wind turbine

风电机组运行对基础承载力和变形有严格要求,海上风机基础承受风、浪、流等水平荷载作用,水平承载性能是桩基设计中需要重点考虑的问题之一,尤其是对于大直径单桩基础,提高其水平承载性能是重要和必要的。针对一种通过在近地表桩体上设置稳定翼板以充分调动浅层土抗力的海上风机大直径加翼单桩基础展开室内模型试验。试验结果表明,稳定翼的设置能够显著提高浅层土抗力的利用率,桩身位移、转角等控制指标显著降低,单桩水平承载力显著提高,提高的幅度与翼板形状参数及埋深相关。

The running of wind power generations imposes strict requirements on the bearing capacity and deformation of foundation. For offshore wind turbine suffering horizontal loads such as wind, wave and current, the horizontal bearing capacity is one of the most important issues in foundation design. Especially for large diameter single pile （monopile） , it＇ s important and necessary to improve its horizontal bearing capacity. A new type of large diameter monopile with wings is investigated. A group of wings are set on the monopile near the ground level, and hence the soil resistance is mobilized fully. The indoor model test is carried out. Test results reveal that the utilization rate of the shallow soil resistance is improved; the displacement and rotation angle of the monopile are reduced; the horizontal bearing capacity of the monopile is obviously improved, but the improvement is influenced by the parameters of the wings.