承力盘对支盘桩单桩负摩阻力影响的有限元分析  

Bearing Plates Influence of Negative Friction of Single Pile with Plates Via Finite Element Analysis

作　　者：范孟华[1] 刘国涛[1] 孔德志[1] 

机构地区：[1]河南大学土木建筑学院,河南开封475004

出　　处：《河南大学学报（自然科学版）》2015年第4期499-504,共6页Journal of Henan University:Natural Science

基　　金：河南大学研究生教育研究与改革实践项目(Y1313012);河南大学本科教学改革项目(HDXJJG2014-127)

摘　　要：通过建立轴对称有限元模型,分析了在大面积地表荷载作用下支盘桩单桩轴向应力的变化情况,得到了承力盘对支盘桩负摩阻力的影响规律.通过分析发现:承力盘处由负摩阻力产生的桩身轴向应力变化较大,地表均布荷载对中性点的位置影响较小;支盘桩的负摩阻力分布形态和普通桩类似,中性点以上的承力盘对负摩阻力影响较大,以下的影响较小;中性点的位置随着承力盘位置的上升和盘数的增多略有上升,随盘数、盘径及盘间距的增加桩的轴向应力增大,但中性点位置基本不变,随着桩长的增大,中性点深度与桩长之比略有降低.Through the establishment of axisymmetric finite element models, axial stress of single pile with plates under large area ground loads was analyzed, and the influence laws of bearing plates on negative friction were deduced. The analysis revealed that the axial stress of piles caused by negative friction had significant change at the plates, while the uniformly distributed ground load slightly affected on the location of the neutral point; the distribution of negative skin friction of pile with plates was similar to ordinary pile, and the effects of bearing plates above the neutral point on the negative friction were bigger, below the neutral point being less ; as the rising position of bearing plates and plates number increased, position of the neutral points was increased slightly; as the plate＇s number, plate＇s diameters and plates spacing increased, the axial stress was increased, but position of the neutral points basically remained unchanged; as pile length increased, ratio of the depth of the neutral point and the pile length was slightly reduced.

关 键 词：承力盘 支盘桩 负摩阻力 有限元分析 

分 类 号：TU473.12[建筑科学—结构工程]