Abstract：Based on the combination of theoretical calculation and model test，the influence of two factors on longitudinal strain and pile impedance gradual change is studied considering the material damping of pile body and the generalized Voigt model of pile side soil. We found that the model test is in good agreement with the theoretical calculation. The longitudinal length size of the pile body defect will obviously affect the reflection phenomenon of the pile body defect and the varying degrees of the pile impedance will also behave regularly on the time history curve. The results obtained in this paper can provide guidance for the testing of pile integrity in practical engineering，in order to reduce the risk of misjudgment.
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2019, Vol. 38 
