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为探讨扩径缺陷桩对竖向荷载作用下群桩基础工作性状的影响,建立了一个群桩基础数值分析模型。采用三维非线性有限元/无限元方法对正常桩基础及含有浅部或深部扩径缺陷桩的群桩基础进行了一系列对比分析。分析结果初步揭示了竖向荷载作用下含扩径缺陷桩的桩基础基本工作特性,得出了扩径缺陷对群桩各桩间轴力分布及承台弯矩分布影响的基本规律性。研究成果不仅有助于认识和合理判断扩径桩的工作机制,而且对评价有扩径缺陷的桩基承载性状、选择缺陷处理技术及桩与承台的结构设计都具有重要的实际意义。
In order to discuss the effect of the enlarged diameter defect pile on the working behavior of pile group foundation under vertical load, a numerical analysis model of pile group foundation was established. A series of comparisons were made between the normal pile foundations and the group pile foundations with shallow or deep expanded diameter defects using three-dimensional nonlinear finite element / infinity method. The analysis results basically reveal the basic working characteristics of pile foundations with enlarged diameter defects under vertical loads. The basic regularities of the influence of the diameter-expanded defects on the axial force distribution and the bending moment distribution of pile caps are obtained. The research results not only help to understand and reasonably judge the working mechanism of pile with enlarged diameter, but also have important practical significance for the bearing behavior of pile foundation, the selection of defect treatment techniques and the structural design of piles and piles in order to evaluate the expansion defects.