海上风电大直径单桩基础灌浆连接段轴向静载荷试验

灌浆连接段是海上风机大直径单桩基础的重要组成部分,其承载性能直接影响到基础稳定性。借助模型试验手段,以海上风机大直径单桩基础灌浆连接段为研究对象,针对灌浆连接段长度、剪力键设置、灌浆连接段形状等设计参数,确定"较短无剪力键"、"较短有剪力键"、"较长有剪力键"、"锥形有剪力键"4种模型试件,开展了轴向静载荷作用下的模型试验,研究了各设计参数对于灌浆连接段承载性能的影响。结果显示:在轴向静荷载作用下,锥形有剪力键试件承载力最优,较长有剪力键试件次之,较短无剪力键试件最差。证明了剪力键设置以及灌浆连接段的锥形构造对于提高大直径单桩灌浆连接段轴向承载性能的作用,为实际工程设计提供了技术参考。

Model tests of grouted connection for monopile of offshore wind turbine under static axial load

Grouted connection is one of the important parts of the monopile for the offshore wind turbine. The stability of the monopile foundation is mostly dependent on the loading capacity of the groutent connection. The parameters such as the length， the shear keys and the shape of the grouted connection are considered. And the bearing capacity of the grouted connections is investigated through model tests with four kinds of specimens， named shorter without shear keys， shorter with shear keys， longer with shear keys and conical with shear keys. The influence of the parameters of the grouted connection is analyzed. Analysis results show that the bearing capacity characteristics of the specimen of the longer with the shear keys are worse than those of the specimen of the conical with shear keys， but better than those of the specimen of the shorter with shear keys. And the bearing capacity characteristics of the specimen of the shorter without shear keys are the worst. The effects of the shear keys and the conical designing on increasing the bearing capacity of the grouted connection are improved. Thus， this model test study can provide a reference for the design of the grouted connection for the monopile of the offshore wind turbine.