With the rapid development of the offshore wind power industry, large-diameter grouted connections (GCs) with high-strength grout have become a developing trend. Previous studies on ordinary-strength and small-scale GCs may not meet current engineering needs. A numerical study was carried out to investigate how the axial mechanical properties of a large-diameter GC that has high-strength grout are influenced by geometric parameters, such as radial stiffness, the height to space ratio (h/s) of shear keys, and the length to diameter ratio (L_g/D_p). The finite element model was verified against the results of the experimental test. The mechanical properties of ultimate bearing capacity, interface transfer strength, ductility, nominal average stress and grout contact pressure distribution are discussed in detail. The results suggest that the increase in radial stiffness can strengthen the axial ultimate bearing capacity and ductility of the GC. Besides, the h/s of the shear keys can affect the ultimate bearing capacity and ductility of GC by influencing the number of diagonal compression struts. Although the L_g/D_p can significantly improve the axial ultimate bearing capacity of GCs, conversely, the interface transfer strength is continuously reduced. The research results can provide technical reference for the design of GCs in the offshore wind turbine industry.

随着海上风电产业的快速发展，高强度灌浆的大口径注浆连接已经成为发展趋势。以前有关普通强度和小型GC的研究可能无法满足当前的工程需求。进行了一项数值研究，以研究具有高强度灌浆的大直径GC的轴向力学性能如何受到几何参数的影响，例如径向刚度，剪切键的高度与空间之比（h / s），长径比（L _g / D _p）。对照实验测试结果验证了有限元模型。详细讨论了极限承载力，界面传递强度，延展性，名义平均应力和灌浆接触压力分布的机械性能。结果表明，径向刚度的增加可以增强GC的轴向极限承载能力和延展性。此外，剪切键的h / s可以通过影响对角压缩支柱的数量来影响GC的极限承载能力和延展性。虽然L _g / D _p可以显着提高GC的轴向极限承载力，反之，界面传递强度则不断降低。研究结果可为海上风机行业的气相色谱设计提供技术参考。