Abstract: With the rapid development of the construction industry, highrise buildings and underground complex building structures continue to be erected. The number of pile foundations used in the construction of these projects is very large, and the construction quality of pile foundations is directly related to the safety and stability of above buildings. Therefore, to ensure the quality of these piles meeting the engineering requirements and design specifications has always been one of the most important topics in the construction industry. The piling is a hidden construction, so it is very complicated and difficult to detect the integrity because it cannot be directly inspected. The low strain detection method based on wavelet analysis for pile integrity testing is adopted in this paper. This is a method used to evaluate the deformation and strain of a pile under loading. This method has the advantages of non-destructive, high precision and real-time, and can effectively guide the design and construction of the pile installation. In this paper, the waveform characteristics of a pile with different defect types are compared with those obtained by finite element numerical evaluation. It is concluded that the numerical simulation results are in good agreement with the actual measured waveform characteristics. Therefore, the low strain detection method on piles by using wavelet analysis can provide an important reference for the piling industry. It can also improve the accuracy and reliability of the pile integrity test results.

Key words: Wavelet Analysis, Pile Foundation Tests, Stress Wave Reflection Method, Pile Integrity Tests