基桩低应变反射波法典型时域信号识别技术研究

Research on Typical Time Domain Signal Recognition Technology by Method of Low Strain Reflection Wave

根据检测实践和现场试验结果,对低应变反射波法检测中经常出现的典型时域信号进行了分析研究。结果表明,传感器粘贴好坏、盲区内浅部缺陷、长桩段扩颈现象、桩周土中软硬夹层的组合特性及嵌岩桩桩底岩土特性变化等,在检测曲线上均具有典型的反射信号。正确认识这些反射信号的特征,可以保证基桩低应变反射波法的检测效果。

Based on testing practice and the result in situ test, analyzing research is carried out on typical time domain signal when using method of low strain reflection wave. The result shows that, situation that the sensor are sticking, inner defect in fade area, long pile section enlarge neck phenomenon, composite characteristic of soft and hard interbed soil around piles as well as changing of geotechnical characteristics at the bottom of socked pile, which has typical reflection signal on the testing curves. Recognizing the reflection signal correctly can make sure the effect of the low strain reflection wave testing method.