文档介绍：更多岩土工程资料 741952
某大型哑铃型承台群桩基础与土体共同作用
竖向承载变形特性数值模拟分析
摘要:用 ANSYS 对某特大桥索塔哑铃型承台群桩基础与土体共同作用进行了三维弹塑性有限元分析。利用桩土界面
间水平方向位移相容,桩土界面间竖向设置双曲线本构方程的弹簧,能较好模拟竖向荷载作用下特大型群桩基础桩土
间相互作用。分析结果表明,数值分析所得承台沉降与承台荷载的关系曲线、桩顶轴力分布、桩顶轴力随承台荷载变
化的关系曲线,与其离心模型试验实测成果较一致。在用离心模型试验成果验证数值分析的正确性下,用其数值分析
成果进一步深入分析群桩基础的承载变形特性。
关键词:离心模型;弹簧;群桩基础;数值分析;ANSYS
中图分类号:TU 文献标识码:A 文章编号:1000–4548(2005)10–1129–07
作者简介:曾友金(1975–),男,工程师。主要从事土工数值分析与离心模型试验方面的工作。
Numerical analysis of interaction between group piles and dumbbell shaped
cap in a super large bridge
Abstract: Interaction between group piles and dumbbell shaped cap in a super large bridge was analyzed with ANSYS software
of 3-D elasto-plastic finite element method. Spring was used in hyperbolic constitutive equation to model the pile-soil-pile
interaction under the vertical load assuming consistency of horizontal displacement on the interface between pile and soil. It
could be seen that the curve of settlement and load of pile, the distribution of axial force on the pile top, the curve of load on cap
and axial force on the top pile obtained with numerical analysis were agreed with those measured in centrifugal model test.
Bearing capacity and settlement of super large pile-cap and pile foundation were thoroughly analyzed with numerical analytical
results validated by centrifugal model test.
Key words: centrifugal model;