挤扩支盘桩桩土相互作用的三维有限元分析  

3D finite element analysis of pile-soil interaction of squeezed branch pile

作　　者：杨保全[1] 俞晨[1] 张思军 

机构地区：[1]河海大学土木工程学院,江苏南京210098 [2]河南省电力勘测设计院,河南郑州450007

出　　处：《河海大学学报（自然科学版）》2008年第3期350-353,共4页Journal of Hohai University(Natural Sciences)

基　　金：国家自然科学基金(50239070)

摘　　要：简要分析了挤扩支盘桩挤扩成盘过程中及受压状态下的桩土相互作用,并结合一工程实例,利用ADINA有限元程序建立了桩土作用三维模型,对挤扩支盘桩受压状态下桩体、土体的应力状态进行了分析计算.结果表明,上支盘内的有效应力要明显大于下支盘,两支盘间土体存在应力叠加,并通过分析指出了最佳的盘间距应大于3.5倍支盘直径.The pile-soil interaction of a squeezed branch pile under squeezing and compression is briefly analyzed. A 3D model was developed based on a finite element program, ADINA, and applied to calculating the stress of the piles and soil when the squeezed branch pile is in compression. The results from a case study show that the effective stress is larger on the upper disk than the lower one, and stress superposition efficiency exists between two disks. It is proposed that the optimal distance between the disks is larger than 3.5 times the diameter of the disk.

关 键 词：挤扩支盘桩 桩土相互作用 盘间距 有限元分析 

分 类 号：TU473.12[建筑科学—结构工程]