挤扩多支盘混凝土灌注桩承载力试验研究  

EXPERIMENTAL STUDY ON BEARING CAPACITY OF SINGLE PILE WITH EXPANDED BRANCHES AND PLATES

作　　者：杨志龙[1] 顾晓鲁[1] 张国梁 

机构地区：[1]天津大学 [2]北京华俊公司

出　　处：《土木工程学报》2002年第5期100-104,共5页China Civil Engineering Journal

摘　　要：根据挤扩多支盘混凝土灌注桩 (以下简称多支盘桩 )的现场静载荷试验结果 ,分析多支盘桩的荷载传递机理。试验结果表明 ,随着竖向荷载的增加 ,由上到下各承力盘或分支先后发挥其端承作用 ;各承力盘或分支上、下一定范围内桩侧摩阻力不能发挥出来 ,建议在多支盘桩设计时 ,承力盘或分支间距宜不小于 (4～ 6)d (d为桩径 ) ;对于粉土、粉质粘土 ,桩侧极限摩阻力为 30～70kPa,所对应的极限位移为 5～ 2 0mm ;桩侧极限侧摩阻力和极限位移随土层埋深而增大。在相同条件下多支盘桩的极限承载力比等截面桩高 50 %。A new type of pile with expanded branches and plates under vertical load is proposed in the paper It is developed from the normal bored pile Refer to the results of field test,some researches are performed The bearing mechanism of the proposed pile is discussed in detail Then,the load transfer of the resistance around the pile and the load applied on branches and plates transfered from the top of pile are studied It is found that the bearing capacity of the pile is higher than that of the normal one about 50% It is patented that the new type of pile has higher economical efforts

关 键 词：承载力 多支盘桩 现场试验 荷载传递 

分 类 号：TU473.14[建筑科学—结构工程]