桩基缺陷偏心的二维效应分析

桩基低应变动测中经常会遇到桩身缺陷偏于一边的情况。对此 ,不同的检测人员可能会给出有一定差异的检测结果 ,这给有关部门对缺陷桩的定性以及决策带来不便。本文针对桩基低应变动测中可能遇到的桩身缺陷偏心问题 ,采用二维波动有限元方法进行数值模拟分析 ,研究桩身缺陷偏心的二维效应 ,分析缺陷偏心时桩顶各部位振动信号的差异 ,探讨对缺陷偏心桩在现场检测中应注意的问题。

Analysis of the two-dimensional effects of eccentric flaws in pile foundation

A problem encountered frequently in dynamic inspection of pile foundation under low strains is the bias of flaws in pile body The inspection results given by different inspectors might differ from each other to some degree The fact often causes inconveniences to related departments in identifying defective piles and related decision making The present paper is aimed at the problem of the eccentric flaws in pile body often encountered in the dynamic inspection of pile foundation under low strains Based on the finite element method of two dimensional wave theory digital simulation analysis has been made to study the two dimensional effect of the eccentric flaws in pile body, to analyse the differences between the vibration signals received at different positions on the top of the pile in the case of eccentric flaws Finally, the problems needing attention in the in situ inspection of piles with eccentric flaws have been suggested and discussed