低应变检测现场采样质量的影响因素分析

Analysis on Influence Factors for Field Sampling Quality in Low Strain Inspection of Piles

现场采集的应力波反射信号是低应变检测分析的基础,采样信号质量的好坏直接影响到时基桩完整性的评判。本文首先简单介绍了应力波反射法的基本原理,然后就影响低应变采样质量的三个因素进行了分析,这三个因素分别是:桩顶条件、震源特性及其影响、传感器的性能及其安装。最后在上述分析的基础上总结出现场采样中应注意的几个问题,为实际工作提供参考。

The signal gathered in the field is the analytical basis for the low strain tests, and the quality of the gathered signal influences directly the judgment of the integrity of foundation piles. The principle of the reflected wave testing with low strain is introduced briefly, and three factors that influence the quality of the wave signal are analyzed. The three factors are the condition of foundation piles, the properties and influence of vibration source and the properties and installation of sensors. Some crucial considerations in the field sampling are summarized based on the above analysis which could supply the reference for engineering practice.