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以一维应力波理论为基础,运用有限元显式分析方法,对混凝土桩在桩顶自由和桩顶受约束时的低应变动测进行数值模拟;并对比两种情况下的动测曲线,发现桩顶受约束时桩的动测曲线不仅受桩周土体的影响,还受到上部结构的干扰,并且桩身反射的三维效应更明显。然后,通过信号处理得到桩顶受约束的混凝土桩的滤波信号,使这种情况下的混凝土桩的缺陷识别更加简便和准确。最后,通过对模拟曲线与实测曲线的较好拟合,表明基于有限元显式分析方法的桩基检测模拟是可靠的,所得结论对于提高混凝土桩低应变动测的准确性具有一定的指导意义。
Based on the one-dimensional stress wave theory, the finite element explicit analysis method is used to simulate the low-strain dynamic behavior of concrete piles when the top of the pile is free and the top of the pile is restrained. By comparing the dynamic deformation curves under two conditions, It is found that the dynamic response curve of pile is not only affected by the soil around the pile, but also disturbed by the superstructure, and the three-dimensional effect of pile reflection is more obvious. Then, the filtered signal of the concrete pile with the top of the pile is obtained by signal processing, which makes the identification of the concrete pile in this case easier and more accurate. Finally, by fitting the simulation curve and the measured curve well, it shows that the pile foundation simulation based on the finite element explicit analysis method is reliable. The conclusions can be helpful to improve the accuracy of low-strain dynamic measurement of concrete piles .