摩擦型群桩工作性状的数值分析  

Numerical Analysis on Behavior of Friction Pile Groups

作　　者：林智勇[1,2] 戴自航[1] 

机构地区：[1]福州大学岩土工程研究所,福州350108 [2]福建工程学院土木工程学院,福州350108

出　　处：《土工基础》2014年第2期95-98,108,共5页Soil Engineering and Foundation

基　　金：福建省自然科学基金资助项目(2011J01308)

摘　　要：利用三维数值模拟法建立与一室内群桩模型相同的模型,在对二者结果分析对比基础上,建立了与实际工程中相近的摩擦型独立单桩和低承台群桩模型,用数值模拟手段揭示了二者工作性状的异同,结果表明:相同条件下,二者的荷载-沉降曲线、侧摩阻力的发挥均不同;群桩基础中荷载并非平均分配到各基桩上;群桩侧摩阻力在桩端附近存在"增强效应",在桩身上部存在"削弱效应"等。这些规律都与已有的理论认识或实测结果相符,说明方法用于摩擦型群桩工作性状的分析是可行的,并可供群桩基础设计计算参考。Three dimensional numerical analyses are performed on a pile group model. Based on the analysis and comparison of a pile group testing model using numerical simulation in 3-dimension, models of a single friction pile and friction piles group with embedded cap were built, and the similarities and differences of their behaviors were revealed by numerical simulation method. The results showed that under the same conditions, the type of load settlement curves and the development of the shaft resistance of the single pile and pile group foundations were respectively different; the upper loading was not simply allot- ted to each pile of the pile group averagely; a so-called ＂strengthen effect＂ of shaft resistance on each pile would occur near the end of the pile; and a so-called ＂weaken-effect＂ would be caused on the upper part of each pile. These laws revealed in the pa per coincided with what people have known in theory or the measurements, which showed that analysis on the behaviors of fric tion pile groups by numerical simulation method was feasible, and could be references for the design calculations of pile groups.

关 键 词：数值模拟 摩擦型群桩 工作性状 荷载一沉降曲线 侧摩阻力 

分 类 号：TU473[建筑科学—结构工程]