非破壞檢測有著經濟、快速及覆蓋範圍廣等諸多優點，且對基樁本身不會造成損害，故非破壞檢測在基樁檢測上是非常有效之方法。在非破壞檢測中，無樁帽基樁之檢測技術已相當成熟，但含樁帽基樁之檢測因其邊界條件的影響，訊號相對複雜許多，使得含樁帽基樁檢測困難重重。本研究使用脈波反應法進行現地試驗，並透過希伯特-黃轉換之總體經驗模態法分解後，再利用快速傅立葉轉換進行含樁帽基樁分析，期許能透過此方法將樁帽、樁底及缺陷頻率分離並嘗試推算出其基樁長度與缺陷位置。研究結果顯示此方法分解出之內建模態函數對於含樁帽基樁長度之推算誤差皆小於6%，存在相當的可信度，但在缺陷的位置方面，對於擁有環狀缺陷的基樁皆無法判斷出其缺陷位置，而對於擁有方型缺陷的基樁，可判斷出其上部缺陷的位置，且誤差均小於3%，但下部缺陷因距離樁底太近，無法判斷出其位置。

Non-destructive testing (NDT) has the advantages of economical, fast, and a wide range of applicability. Therefore it is a fairly effective testing method. The testing of piles without pile cap has been considered a well-developed technique. However, affected by complex boundaries conditions, testing of piles with pile cap is more difficult. This study use Impulse response (IR) method for the field test, then use ensemble empirical mode decomposition (EEMD) by Hilbert-Huang Transform to decompose the signals, finally use Fast Fourier Transform (FFT) to transform time domain data to frequency domain data. The purpose of this study is to separate the pile cap, pile bottom, and defect frequency and try to estimate the pile length and defect locations of piles with pile cap. The results show that the error of the estimation of pile length is less than 6%, and the errors of estimating top rectangular-defect were less than 3%. However, this method was less effective to detect circularity-defect and bottom rectangular-defect.

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