工程用挤扩支盘桩承载性能分析

Analysis of Bearing Behavior of Squeezed Branch Pile Used in the Project

总结了挤扩支盘桩的特点,针对挤扩支盘桩承载力计算公式,分析了挤扩支盘桩的承载机理与受力性能,提出应考虑支盘外形尺寸和施工质量等对支盘端阻和侧阻的影响的建议。对某工程基础用挤扩支盘桩单桩承载力检测试验的试验过程与结果进行分析,结合成桩工艺与承载特性,通过以往的工程经验和理论分析,得出该工程桩基承载力试验预定极限荷载过于保守,并没有得出单桩极限承载力,依此检测结果可能会导致该工程单桩承载力得不到充分利用。

Summarizes the advantages and disadvantages of squeezed branch pile.Analyzed bearing mechanism of pile according to calculation formula in literature,put forward that should consider the impact dimensions of branch or plate and construction quality of pile on end resistance and side resistance of branch or plate.Analyzed the test procedures and results of a single pile bearing capacity test in one project,combined the pile construction process and bearing characteristics,by previous engineering experience and theoretical analysis,draw a conclusion that the assumed limit bearing capacity of pile is conservative,it does not obtain the limit bearing capacity of a single pile,maybe also make the bearing capacity of pile that not fully utilized in this project according the test result.