A uniform arrangement of individual piles is commonly adopted in the conventional pile group foundation, and basin-shaped settlement is often observed in practice. Large differential settlement of pile groups will decrease the use-safety requirements of building, even cause the whole-building tilt or collapse. To reduce differential settlement among individual piles, non-uniformly arranged pile groups can be adopted. This paper presents a finite element analysis on the response of pile groups with different layouts of individual piles in pile groups. Using the user-defined subroutine FRIC as the secondary development platform, a softening model of skin friction and a hyperbolic model of end resistance are introduced into the contact pair calculation of ABAQUS software. As to the response analysis of a single pile, the reliability of the proposed secondary development method of ABAQUS software is verified using an iterative computer program. The reinforcing effects of individual piles is then analyzed using the present finite element analysis. Furthermore, the response of non-uniformly arranged pile groups, e.g., individual piles with variable length and individual piles with variable diameter, is analyzed using the proposed numerical analysis method. Some suggestions on the layout of individual piles are proposed to reduce differential settlement and make full use of the bearing capacity of individual piles in pile groups for practical purposes.

中文翻译：

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考虑桩土系统渐进破坏的非均匀排列群桩响应的有限元预测

在传统的桩基基础中，通常采用均匀分布的单个桩，并且在实践中经常观察到盆状沉降。大的桩群差异沉降会降低建筑物的使用安全要求，甚至会导致整个建筑物倾斜或倒塌。为了减少各个桩之间的差异沉降，可以采用非均匀排列的桩组。本文对桩组中单个桩不同布置的桩组的响应进行了有限元分析。使用用户定义的子例程FRIC作为辅助开发平台，将皮肤摩擦的软化模型和端电阻的双曲线模型引入了ABAQUS软件的接触对计算中。至于单桩的响应分析，使用迭代计算机程序验证了所提出的ABAQUS软件二次开发方法的可靠性。然后使用当前的有限元分析来分析单个桩的加固效果。此外，使用所提出的数值分析方法来分析非均匀排列的桩组的响应，例如长度可变的单个桩和直径可变的单个桩。提出了一些关于单桩布置的建议，以减少差异沉降，并在实际中充分利用桩组中单桩的承载力。利用所提出的数值分析方法，分析了非均匀排列的桩群，例如长度可变的单个桩和直径可变的单个桩的响应。提出了一些关于单桩布置的建议，以减少差异沉降，并在实际中充分利用桩组中单桩的承载力。利用所提出的数值分析方法，分析了非均匀排列的桩群，例如长度可变的单个桩和直径可变的单个桩的响应。提出了一些关于单桩布置的建议，以减少差异沉降，并在实际中充分利用桩组中单桩的承载力。