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Pile Integrity Testing Based on Wavelet Analysis

Author: TanHaiLi
Tutor: ChenJingZuo
School: Wuhan University of Technology
Course: Engineering Mechanics
Keywords: Pile foundation inspection Integrity Stress wave reflection method Wavelet Analysis
CLC: TU473.1
Type: Master's thesis
Year: 2010
Downloads: 93
Quote: 1
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Abstract


With the large number of applications of the pile, the pile foundation engineering problems more and more, which makes the detection of Pile Integrity increasingly important. Foundation piles as a commonly used form the basis of, in various engineering fields a wide range of applications, has achieved a certain degree of social and economic benefits. Pile foundation is a covert project to ensure its safety and reliability of its quality testing is particularly important. Low strain reflected wave method has the advantages of low-cost, convenient, simple operation, and has been widely used in pile integrity testing. However, due to the traditional interpretation of the stress wave reflection method of waveform mainly rely on the experience of testers, so pile testing results there is a big error, its theoretical basis, test technology, especially post-processing analysis means remains to be the perfect place. Wavelet theory as a theory of science and Applied Sciences close together, as a technical tool and method has been widely used in signal processing, pattern recognition, and space exploration. Wavelet analysis is developed in recent years, a new time-frequency analysis method. Wavelet analysis to overcome the short-time Fourier transform defect characterized by multi-resolution analysis is widely used in various time-frequency analysis of the field. This article first summarizes the low strain the basic principle of the law of reflection wave of low strain reflected wave method of testing techniques and pile integrity testing based on low strain reflected wave method, limitations and scope as well as test blind and combined engineering analysis and interpretation of pile integrity detection signal. Secondly, on the basis of the full introduction of wavelet theory, the paper analyzes the Fourier transform and the short time Fourier transform Details continuous wavelet transform and discrete wavelet transform, the wavelet transform time-frequency localization characteristics described multi-resolution theory and wavelet packet analysis and wavelet packet decomposition and reconstruction algorithm, summarized the best choice of the wavelet basis. Finally, the nature of the use of wavelet function, the paper selects biorthogonal wavelet bases db6, wavelet analysis applied to the pile foundation signal denoising MATLAB software and RS piles under dynamic tester, determine the pile foundation shallow defects position to eliminate baseline drift signal processing, with its multi-resolution analysis. By comparison with the traditional low strain reflected wave method of signal analysis method, the results show that the correct interpretation of these analyzes will help pile integrity.

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Foundation > Pile foundation and deep foundation > Pile
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