三维复合模型及其在散体桩复合地基分析中的应用.pdf

第 23 卷第 20 期岩石力学与工程学报 23(20):3405~3412
2004 年 10 月 Chinese Journal of Rock Mechanics and Engineering Oct.,2004



三维复合模型及其在散体桩复合地基
分析中的应用

徐洋 1 谢康和 2 何丽波 1 许国平 1
(1 宁波市建筑设计研究院宁波 315012) (2 浙江大学岩土工程研究所杭州 310027)

摘要在假定复合地基桩土间竖向和切向变形协调以及应力平衡的基础上,用有效应力分析法建立了三维复合有
限元模型。并令复合有限元模型的平均固结度等于单桩轴对称复合地基的平均固结度,从而反算出其在线性加荷
情况下的渗透系数,把得到的渗透系数代入三维复合有限元模型中就可用于固结变形分析。算例分析表明,无论
复合地基中的桩体是否打穿软土层,该方法都具有较好的计算精度,该方法较适用于对散体桩复合地基的固结分
析。
关键词土力学,复合地基,三维有限元,复合模型,固结
分类号 TU 433 文献标识码 A 文章编号 1000-6915(2004)20-3405-08

ESTABLISHMENT OF THREE POSITE MODEL AND
ITS APPLICATION POSITE FOUNDATION WITH
GRANULAR PILES

Xu Yang1,Xie Kanghe2,He Libo1,Xu Guoping1
(1Ningbo Architectural Design and Research Institute, Ningbo 315012 China)
(2Institute of Geotechnical Engineering,Zhejiang University, Hangzhou 310027 China)

Abstract On the basis of assuming deformation consistence and stress equilibrium at the interface between piles
and soil posite foundation,three posite FEM model is established by effective stress
analysis method in this paper. By assuming that the average consolidation degree in the model is equal to that in
composite foundation,the permeability of the model is back calculated and the procedure of consolidation analysis
posite foundation is programmed at the same time. Numerical examples show that the proposed method is
of good accu