竖向受荷单桩细观工作性状  

Meso-behavior of single pile subjected to vertical load

作　　者：陈亚东[1] 佘跃心[1] 龚成中[1] 

机构地区：[1]淮阴工学院建筑工程学院,江苏淮安223001

出　　处：《南京工业大学学报（自然科学版）》2012年第5期49-52,共4页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：江苏省自然科学基金资助项目(BK2011406)

摘　　要：在单桩室内模型试验提供宏观依据基础上,通过对颗粒流程序的二次开发,建立单桩的三维颗粒流分析模型,对竖向受荷单桩的承载特性、荷载传递特性、桩周土体位移场、应力及孔隙率变化规律进行研究。颗粒流数值分析结果表明:单桩桩侧摩阻力的发挥先于端阻力,加载后期在桩身中下部存在一侧摩阻力弱化区,单桩桩侧摩阻力的分布与桩表面的法向应力一致;单桩桩身接触力上小下大,桩侧接触力方向以斜向下为主,桩端下土体孔隙率的变化趋势与土体应力的发展趋势保持一致。颗粒流数值模拟研究完善了对单桩细观工作性状的认识。Based on the experiment results for a sigle pile,a three-dimensional numerical analysis model was established by the secondary development of particle flow program.Characteristics under vertical loading such as load-bearing,load transfer,soil displacement around pile,soil stress and porosity changing regularity of single pile,were studied.Results show that the shaft resistance of single pile developed first than tip resistance and a shaft resistance weakening zone exists in the lower part of pile.The distribution of shaft resistance was consistent with that of pile side normal stress.It could also be found that the contact force on pile body increases gradually with pile depth the contact force,on pile side directs obliquely downward,and variation trend of soil porosity remains consistent with that of soil vertical stress.The particle flow numerical method enhances the recognition on meso-behavior of single pile.

关 键 词：桩基础 颗粒流 数值分析 工作性状 

分 类 号：TU473[建筑科学—结构工程]