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中文摘要：
作为异形截面桩,现浇X形桩承载特性主要受侧摩阻力特性的影响。采用有限元软件ABAQUS建立了三维X形桩和圆形桩单桩复合地基计算模型,对比分析了两种桩型的侧摩阻力分布特点和侧阻承载能力的差异。分别分析了X形桩侧摩阻力沿桩周和桩长的分布特性。结果表明：X形桩侧摩阻力和侧阻承载能力都优越于等截面积的圆形桩,在理想成桩条件下,X形桩侧摩阻力在0.9倍桩长深度处比圆形桩侧摩阻力有较大的提高。在水平方向,由于土拱效应,X形桩凸出段侧摩阻力为凹弧段的1.5～3倍。深度方面,X形桩凸出段侧摩阻力与凹弧段侧摩阻力比值沿深度逐渐增大。这些结论为X形桩的承载力设计计算提供了一定的理论依据。
英文摘要：
The bearing capacity of X-section cast-in-place concrete pile（XCC pile）,a special cross-section pile,is significantly influenced by side resistance.The single-piled composite foundation including XCC pile and circular pile is simulated by means of the finite element program ABAQUS.The side resistance and side bearing capacity are compared between XCC pile and circular pile.The distribution of side resistance of XCC pile is analyzed via cross-section plan and depth.The results indicate that both the side resistance and the side bearing capacity for XCC pile are better than those of circular pile,and that the side bearing capacity of XCC pile is significantly larger than that of circular pile at the relative depth of 0.9.At the cross-section plan,because of the soil arching,the side resistance of convex arc is about 1.5 to 3 times as large as that of concave arc for XCC pile.The ratio of the side resistance for convex arc to that of concave arc increases with the relative depth.The results are available for the design of XCC pile.
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