摘要
简述反射波法桩基完整性测试的基本理论,认为嵌入土中的桩基础,在桩顶激发的弹性波传播规律满足一维弹性波动过程,在波阻抗界面(缺陷)上的反射特征为平面波的反射。桩身存在的缺陷是多种多样的,低阻抗反射特征的缺陷为缩径类缺陷,高阻抗反射特征的缺陷为扩径类缺陷,主要区别表现在反射波与入射波相位特征上。根据以上原理对三根实测工程桩的时程曲线进行了分析,该技术可用于缺陷定性检测。
The basic principles of pile foundation completeness testing by reflection method were described. It was pointed out that the transmission rule of the elastic waves excited on the top of the pile foundation inserted in the earth met the procedure of one-dimentional elastic movement. The reflection feature on wave impedance boundary was plane wave reflection. The defects of low impedance reflections were reduced radial ones and the defects of high impedance reflections were enlarged radial ones. The main difference was in the phase features of reflections and incident waves. The time-displacement curves of three piles measured were analyzed. The method could be used for the discrimination of defects.
出处
《无损检测》
2003年第2期84-87,91,共5页
Nondestructive Testing
