To solve the problem where the low-strain testing method for pile integrity can only qualitatively identify the level of pile defects and cannot quantitatively identify relevant issues,the governing equation of foundation pile considering the action of soils around the pile was established according to the dynamic theory,and the analytical solution of the velocity response of any section of the pile was obtained using wave theory.Through numerical simu-lation and from test results of model piles at different ages,with the increase in age,the soil damping around the pile was found to gradually increase,whereas the ratio of the reflected wave amplitude to the incident wave ampli-tude of speed gradually decreased.According to the attenuation law and the reflection law on the change in section impedance,a quantitative identification relationship of defect degree was established,which could be used to quan-titatively identify the defect level of a pile simply and rapidly.
关键词
基桩/振动波/桩土相互作用/阻尼/桩顶速度响应/反射波/缺陷程度/定量识别
Key words
pile/vibration wave/pile-soil interaction/damping/pile top velocity response/reflection wave/defect level/quantitatively identify
维普
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