单桩与群桩变形特征对比有限元分析  

FINITE ELEMENT ANALYSIS OF SOIL ARCHING EFFECT OF SINGLE PILE AND PILE GROUP IN SOFT SOIL FOUNDATION

作　　者：崔军强 耿敏 CUI Junqiang;GENC Min(School of Civil Engineering,Dalian Jiaotong University,Liaoning Dalian 116028,China)

机构地区：[1]大连交通大学土木工程学院,辽宁大连116028

出　　处：《低温建筑技术》2023年第2期126-129,共4页Low Temperature Architecture Technology

摘　　要：群桩基础广泛应用于建筑领域,为深入研究群桩基础作用详细机理,通过非线性有限元ABUQUS建立单桩与群桩模型,研究轴力、桩土应力比、桩土差异沉降对单桩和群桩的影响,并计算群桩效率系数,优化桩承式加筋路堤设计参数.研究结果表明,群桩基础相对于单桩基础承载力明显;通过分析桩土应力比变化规律,随着荷载的增大,中心桩、边桩、角桩的桩土应力比逐渐变大;越靠近群桩基础中心的位置,桩间土承受的压力越小,在边缘处达到最大值.成果将丰富数值模拟研究并为实践应用提供借鉴和参考.Pile group foundation is widely used in the construction field.In order to study the detailed mechanism of pile group foundation,the single pile and pile group models are established by nonlinear finite element ABUQUS.The effects of axial force,pile-soil stress ratio and pile-soil differential settlement on single pile and pile group are studied.The efficiency coefficient of pile group is calculated and the design parameters of pile-supported reinforced embankment are optimized.The results show that the bearing capacity of pile group foundation is obviously higher than that of single pile foundation.By analyzing the variation law of pile-soil stress ratio,with the increase of load,the pile-soil stress ratio of central pile,side pile and corner pile gradually increases.The closer to the center of the pile group foundation,the smaller the pressure on the soil between the piles,reaching the maximum at the edge.The results will enrich the numerical simulation research and provide reference for practical application.

关 键 词：群桩 土拱效应 桩土应力比 轴力 

分 类 号：TU473.1[建筑科学—结构工程]