摘要:
以复合地基为对象,将桩、土、垫层、承台视为一个相互作用的复合地基体系,通过考虑桩土界面接触摩擦作用、土体的非线性特性及系统各个部分的主要作用及其相互影响,采用三维有限元数值分析对复合地基进行系统地分析,研究复合地基的承载机理及其加强效应。首先分析一般单桩和复合地基中单桩的荷载传递特性,然后研究群桩复合地基中桩侧摩阻力、桩顶应力及桩身附加应力分布规律与特性,得出了一些有益的结论,为复合地基的理论分析及工程设计提供理论依据和借鉴。
关键词:
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复合地基
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相互作用
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承载
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数值分析
Abstract:
In the composite foundation,the pile,soil,cushion and pile cap were considered as an interacting foundation system.In consideration of the friction between the soil and the piles,nonlinear character of soil,main effect of each part in the system and their interrelationship,the composite foundation and it′s bearing mechanism and the stiffen effect were studied by the three-dimensional finite element numerical analysis.At first,the load transfer character of the single pile was analyzed,then the lateral friction of the pile,the stress on the pile top and the distribution of the stress in the pile of the composite foundation were studied.Finally,some results would be profitable and helpful to the theoretical analysis and the engineering design.
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