桥梁挤扩支盘桩承载性能探讨

Discussion on Bearing Capacity of Bridge-expanded Branch Piles

文章通过广东潮汕环线高速公路桑田高架桥桩基承载能力试验,对比分析了常规桩与支盘桩在试验荷载作用下桩身轴力与位移的差异,结果表明:常规桩在各级荷载作用下轴力与桩顶位移增加均比较均匀,加载到极限承载力时位移迅速增大,桩基失效;而对于支盘桩,当荷载增大到一定程度时承力盘开始发挥承载力,承力盘处轴力会突变增大,桩顶位移随着试验荷载的增加基本呈线性增长。同时,根据试验结果分析了支盘桩各支、盘在荷载作用下的工作特性,为以后桥梁支盘桩的设计与研究提供了参考。

Through the bearing capacity test of Sangtian Viaduct pile foundation in Guangdong Chaoshan Ring Expressway,this article compared and analyzed the difference between the pile-body axial force and the displacement of conventional pile and branch pile under the test load,the results showed that： both the axial force and pile-top displacement of conventional piles are relatively increasing evenly under different loads,the displacement rapidly increases and the pile foundation fails when loaded to the ultimate loads; for the branch piles,the bearing plate begins to exert its bearing capacity when the load increases to a certain extent,the axial force at the bearing plate will increase abruptly,and the pile-top displacement will increase linearly with the increase of test load.At the same time,according to the test results,it analyzed the work characteristics of all branches and plates of branch piles under the load,which can provide reference for the future design and research of branch piles of the bridges.