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现浇X形桩复合地基桩侧摩阻力分布特性

, PP. 17-23

Keywords: 道路工程,现浇X形混凝土桩,有限元分析,桩侧摩阻力,群桩复合地基

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Abstract:

?依托南京市桥北污水处理厂现场静载荷试验,应用ABAQUS软件分别建立了现浇X形单桩复合地基、群桩(梅花形布置和正方形布置)复合地基桩侧摩阻力的模型。结果表明:现浇X形桩中性点出现在桩长1/4~1/3深度处,负摩阻区明显存在但小于正摩阻区,是典型的摩擦型桩;侧摩阻力随桩体模量、土体参数和一定范围内桩长的增大而增大,随褥垫层厚度的增大而减小;布桩间距影响侧摩阻力的发挥,在允许的承载范围内,应尽量增大布桩间距,优化侧摩阻力的分布。

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