桩顶竖向荷载作用下桩土响应的数值分析  

Numerical analysis of pile soil interaction under pile head vertical load

作　　者：刘自由[1] 林杭[2] 江学良[1] 

机构地区：[1]湖南城市学院土木工程学院,湖南益阳413000 [2]中南大学资源与安全工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2011年第2期508-513,共6页Journal of Central South University:Science and Technology

基　　金：湖南省研究生创新基金资助项目(1343-74236000014);中南大学前沿研究计划项目(2010QZZD001)

摘　　要：为了研究桩土之间的相互作用机理,利用数值方法建立桩土计算模型,分析桩顶荷载作用下桩侧摩阻力分布、桩体轴力分布、中性点位置的变化规律以及桩周土体的位移。研究结果表明:桩侧负摩阻力沿桩身先增大后减小,并逐渐过渡到正摩阻力;随着桩顶荷载的增大,桩侧负摩阻力逐渐减小,中性点位置上移;桩体轴力沿桩身呈现先增大后减小的趋势;受到桩侧摩阻力的作用,位于地表的桩周土体沉降受到一定影响,其影响范围随桩顶荷载的增大而减小。In order to study the interaction mechanism of pile soil,the calculation of the pile soil system was built by the numerical method,the skin friction and axial stress distribution of pile were analyzed as well as the variation discipline of neutral point position and the soil displacement situation.The results show that the negative skin friction of pile first increases then decreases,and finally changes to the positive skin friction.With the increase of pile head load,the pile negative skin friction decreases gradually,and the neutral point position moves higher.The axial stress of pile first increases and then decreases.Due to the effect of pile skin friction,the settlement of the ground surface soil is influenced by the pile skin friction,and the influence area reduces with the increase of the pile head load.

关 键 词：桩 摩阻力 轴力 中性点 数值分析 

分 类 号：TU457[建筑科学—岩土工程]