應用應力波傳理論發展之基樁完整性檢測法，於近年來被廣為使用於新建基樁之完整性及樁長之檢驗，其中尤以音波回音法最常被使用。本法具有經濟、快速、安全及涵蓋範圍廣的優點，但由於現地土壤造成能量的衰減，因而對於長大型基樁之檢測，常導致基樁完整性或樁底位置的難以判別。
　　本研究以有限元素分析軟體ABAQUS模擬三維基樁完整性檢測之音波回音法。基樁混凝土及樁周土壤採用三維實體元素C3D8R模擬，並假設其為線彈性材料。模擬結果與基本的應力波傳理論相符合。本研究模擬討論之基樁為非對稱頸縮缺陷基樁，內容包含：基樁樁頂接收器位置對接收信號的影響；不同基樁頸縮缺陷面積之檢測能力比較；各種不同長徑比基樁之衝擊荷重延時最適化探討；不同強度之層狀土壤對於檢測訊號之影響程度。將以上之模擬訊號進行低通濾波處理，再輔以連續小波轉換分析，以期能突顯速度歷時曲線不易察覺之缺陷或樁底回彈訊號。最後，本研究亦對現地敲擊檢測訊號以連續小波轉換進行分析。研究結果證明，以音波回音法檢測基樁，並配合連續小波轉換進行檢測訊號之判讀，將可有效且快速的突顯缺陷及樁底位置，有助於分析人員更準確的掌握基樁之完整性。

　　Pile integrity test (PIT), which applies stress wave theory to develop, has been widely used to test the integrity and the length of newly completed piles recently. Sonic echo (SE) method, one of PIT methods, has the most frequently been used due to its economical, fast, safe, and furthermore, it can cover a wide range of tests. However, when it comes to the test of a large diameter and long pile, due to the energy decay caused by the surrounding soil, the integrity of pile and the location of pile tip will be hard to identify.
　　In this study, SE method is simulated by using Finite Element Method software, ABAQUS. The concrete of piles and the surrounding soil of the piles are simulated by 3D solid element, C3D8R. The piles are assumed to be a linear elastic material. The result of simulation agrees well with that of using the basic stress wave theory. The piles used to simulate and to discuss in this study are the unsymmetrical necking flaws of piles. Discussions in this study include the effect of receiving signal due to the positions of geophones at pile head, the comparison of testing abilities among different necking areas of piles, the suitability of impulse duration in piles with different depth/diameter ratio, the influence of the layer soil with different intensity has on detecting signal. The signal is processed by low pass filter and continuous wavelets transform (CWT) to enforce the feature of the reflective signal caused by flaws or pile tips. Also, the signal detected in situ is analyzed by CWT method. The result shows that using SE method and CWT to enforce the flaws of the piles and the pile tips will be helpful for grasping the pile integrity test result more accurately.

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