低应变法浅部缺陷测试波形分析与验证总结

ANALYSIS AND VERIFICATION OF SHALLOW DEFECTS BY LOW STRAIN INTEGRITY TESTING

桩身完整性是基桩发挥承载力的保证。国内外普遍采用的低应变反射波法(或瞬态时域分析法)是对基桩进行桩身完整性普测最常用的方法,该方法浅部缺陷测试波形复杂、较正常测试波形区别大、易被误判漏判,需要一定的工程经验才能对浅部缺陷作出判定。结合低应变反射波法检测工程实例与检测后验证结果就低应变反射波法检测中遇到的典型测试波形尤其是浅部缺陷典型测试波形进行分析、总结。

Pile integrity is the guarantee of bearing capacity of foundation pile.The low strain reflected wave method(or transient time domain analysis)widely adopted at home and abroad is the most commonly used method for general testing of pile integrity testing.The shallow defect testing waveform of this method is complex and different from the normal testing waveform,which is easy to be misjudged and missed.Therefore,certain engineering experience is required and necessary.In this paper,the typical test waveforms encountered in the low strain reflected wave method,especially the typical shallow defect test waveforms,are analyzed and summarized in combination with the testing engineering examples and the verification results after testing.