低应变反射波法检测桩身完整性及缺陷判别

Completeness Testing and Defect Analysis of Piles by Low Strain Reflection Wave Method

根据低应变反射波基本原理,在检测桩基完整性时,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过程,在波阻抗界面(缺陷)上的反射特征为平面波的反射。根据低应变反射波法的检测理论,结合工程实例说明检测的成像特征。工程应用中,该技术可以用于桩身缺陷定性检测,同时也可用于对缺陷类别的判断。

According to the theory of the low strain reflection wave method, the transmission of the elastic wave excited on the top of the pile foundation inserted in the earth meets the procedure of one - dimentional elastic movement when it is used to test the completeness of piles. The reflection feature on wave impedance boundary is plane wave reflection. In this paper, the basic principles of pile completeness testing by the low strain reflection wave method were described. The imaging feature was introduced in some application cases. In practice, this method could be employed for the discrimination of pile deflects. It should be noted that deflects should be discreetly ascertained.