应用动测法检测桩基质量

THE APPLICATION OF VIBRATING INSPECTION METHOD TO EXAMINE THE QUALITY OF PILE BOTTOM

本文简述了动测法对桩基质量进行检测的基本原理和测试,解释方法。列举了几种不同地层上的桩底应力波反射特征,根据其反射系数(R)值的改变和振动频率(f_n)的大小变化进行分析、判断桩底的胶结质量以及沉渣厚度等。

This paper presents briefly an essential principle for the quality inspection and interpre tation of pile bottom with vibrating inspection method which can determine the quality of pile body according to analysis of longitudinal vibration frequency (fn) and reflect coefficient (R). It mainly analyses the character of stress wave reflection of pile bottoms which are In cated in several different strength soil layers, and basing on the analysis of changes of ceflest coefficient (R) and vibration frequency (fn), the quality of soil cementation of pile bottom and the sediment thickness can be judged. The principle and method have been applied and verified in pile quality inspection of many engineerings in Zhuhai and Zhongshan of Guangdong for its advantages of low-cost ami practicability.