反射波法检测长螺旋钻孔压灌混凝土桩波形曲线特征分析

Detecting the Wave Curve Characters of Auger Bored Concrete Pile by Reflected Wave Method

低应变反射波法是桩基检测中常见的一种方法。为了积累长螺旋钻孔压灌混凝土桩身缺陷波形曲线特征判别的经验,为以后基桩检测提供参考,本文介绍低应变反射波法的基本原理,结合工程实例和已有资料进行了长螺旋钻孔压灌混凝土桩身缺陷理论波形曲线特征对比和实测波形曲线对比分析讨论。提供了现场反射波法检测长螺旋钻孔压灌混凝土桩的波形曲线特征,并通过对波形曲线的分析得出,结合时域和频域曲线分析可以判断长螺旋钻孔压灌混凝土桩身缺陷。

Low strain reflected wave method is a common method in foundation pile detection. In order to accumulate experiences to discriminate auger bored cast-with-pressure concrete pile defeet wave curve and offer important reference to pile detection, the article introduced basic principle of low strain reflected wave method. Combining with practice engineering examples and data, the article analyzed and discussed the comparison of auger bored east-with-pressure concrete pile defect theory wave curves and measured low strain wave curve. The article offered in-situ tests to reflect wave shape of the auger bored cast-with-pressure concrete pile test by reflected wave method. Based on the wave curves and analysis, it was pointed out that we can judge the auger bored cast-with-pressure concrete pile defect by means of frequency domain and time domain analysis.