台灣位於環太平洋火山地震帶，地震頻繁且可能引發土壤液化，導致結構物損壞。因此，許多建築物採用基樁作為基礎形式，確保施工品質變得尤為重要。除了政府推行的三級品質管理制度，針對基樁的試驗驗證也不可或缺。非破壞檢測以經濟、迅速及覆蓋範圍廣泛著稱，相較於傳統檢測，基樁的樁載重試驗勞師動眾，因此非破壞檢測在基樁上已行之有年。本研究使用音波回音法之數據，將其以希伯特-黃轉換之自適應噪聲完整集合經驗模態分解法分解，找出有物理意義之本質模態函數，將其利用希伯特轉換得到相角變化資訊，以期辨識樁底與缺陷的回波訊號，找出基樁深度與缺陷位置。在設計缺陷基樁部分，結果顯示在基樁深度誤差小於4%，對於基樁上部缺陷深度誤差小於4%，具有相當可信度，然而基樁下部缺陷因距樁底過近，故無法有效分離，無法判斷位置。在現地基樁部分，相較複數連續小波轉換，基樁深度的檢測誤差小於3%，兩者結果十分接近，說明希伯特-黃轉換法可提供驗證。

Taiwan is located on the Circum-Pacific Seismic Belt, experiencing frequent earthquakes that can cause soil liquefaction, leading to structures damaged. Given that consequence above, many buildings adopt pile foundations to make the assurance of construction quality. Besides the government's implementation of a three-tier quality management system, testing and verification of piles are also necessary. Non-destructive testing (NDT) is known for its cost-effectiveness, speed, and wide coverage. In contrast to traditional testing methods, pile load tests are both workforce and capital consumed, which is why NDT has been widely utilized for pile integrity tests for many years. This study uses data from the sonic echo method, decomposed by Hilbert-Huang transform (HHT) and complete ensemble empirical modes decomposition with adaptive noise (CEEMDAN) to identify intrinsic mode functions (IMFs) with physical significance. By applying the Hilbert Transform to obtain phase angle variation, this study aims to identify the echo signals from the pile bottom and defects, determining the pile depth and defect location.In the designed defective piles, results show a pile depth error of less than 4%, with an error in the upper pile defect depth less than 4%, indicating considerable reliability. However, due to the proximity of defects in the lower pile to the pile bottom, effective separation and location determination were failed in this test. For in-service piles, the depth detection error is less than 3% compared to complex continuous wavelet transforms (CCWT), with very close results, demonstrating that the HHT method provides reliable verification of the pile foundation.

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