非破壞檢測技術之發展已歷時多年，其檢測技術、設備與規範皆已日趨完善，對於土木工程中樁基礎品質之檢測佔有一席之地。常見的訊號處理方式為小波轉換技術，本研究針對長徑比為20(包含一根完整樁，五根缺陷樁)、32.5與40之無樁帽與含樁帽基樁進行音波回音法試驗，並將所得之訊號進行複數連續小波轉換，藉由時頻分析法進行基樁完整性評估並比較各種方法之優劣，更從相角之微小變化尋找潛藏缺陷，同時探討土壤之圍束效應對於應力波於樁身傳遞之影響。對於小波轉換所使用之函數至今仍無一定標準，為提高分析結果之準確率，構思一套標準流程進行分析，並根據不同性質之無樁帽及含樁帽基樁，找尋最適合分析之頻率範圍及函數，以供後人研究參考。研究結果顯示：complex Gaussian小波函數，對於無樁帽與含樁帽基樁最合適之小波參數為(p=2)，與周暐翔(2016)之研究結果相符合，complex Morlet小波函數對於無樁帽基樁最合適之小波參數為(fb=0.5, fc=1)，含樁帽基樁則為(fb=2, fc=0.5)；前述之小波函數樁長評估結果幾近相等，整體誤差小於5%；藉由相角圖之微小訊號變化，即可檢測出基樁本身或周圍阻抗之變化，同時也影響著訊號分析之結果。

In recent years, the technique of wavelet transform has been widely used in signal processing in different fields, including non-destructive testing(NDT) of pile foundations. In addition, using time-frequency analysis to analyse time-domain data, from sonic echo(SE) method, can also evaluate the pile integrity effectively. The purpose of this study is about using complex continuous wavelet transform(CCWT) to estimate the pile length and impedance changes of large-scale and in-situ piles, ratio of slenderness are 20, 32.5, 40, by analyzing the time-frequency analysis. In order to increase the accuracy, conceiving a set of standard processes to find the most appropriate analysis frequency and parameter of function for the piles.
The results show that using the most suitable complex wavelet function for analysis can effectively evaluate different types of foundation piles, the analysis results are almost equal, and the overall pile length error results are less than 5%. Beside, the phase angle diagram can compensate for the disadvantage that the phase spectrogram cannot see the tiny reflected signals.

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