摘要
為求取真實的土壤動態性質，野外現地試驗是不可缺少的一環，鑽孔震測法在土壤波速檢測中經常被提起，其試驗獲得的剪力波速，可透過彈性波傳理論得到剪力模數，為獲得準確的剪力模數，判斷準確的剪力波速是必要的。傳統上多透過人為判斷應力波傳遞到受波器的時間，波形特徵微弱時，多半含有人為誤差，本研究透過複數連續小波轉換，進行訊號處理，藉由傅利葉轉換得到的最大振幅頻率，並應用於時頻域的時頻分析和相角頻譜圖，企圖降低人為判斷的誤差、實現客觀判斷波傳時間的目的。對於小波轉換使用的參數沒有一定標準，為提高分析結果的效率、準確率，本研究透過可行性調查，分析可用的參數，並透過整體分析，確定合用於鑽孔震測法的函數及參數。研究結果顯示：應力波最大振幅頻率約在50~100 Hz時，下孔式震測法適合使用複數Gaussian、複數Morlet小波，跨孔式震測法適合使用複數Gaussian、複數Morlet小波。上述小波函數與參數的轉換結果與人工判讀誤差< 3 %，甚至在雜訊程度很高的波形也能辨別，並能提供下孔式震測法頻譜-深度關係圖，以達成判斷波傳時間的目的。

SUMMARY
In order to obtain the real dynamic properties of soil, the field test is an indispensable method. The borehole seismic test is often mentioned in the detection of soil wave velocity. The shear modulus can be obtained by elastic wave propagation theory and shear wave velocity. In order to obtain accurate shear modulus, it is necessary to judge the shear wave velocity accurately. Traditionally, the time which stress waves transmitted to the receiver is judged artificially. When the waveform characteristics are weak, most of them contain artificial errors. In this study, the signal processing is carried out by a complex continuous wavelet transform. The maximum amplitude-frequency obtained by Fourier transform is applied to time-frequency analysis and phase-angle spectrogram in the time-frequency domain in attempt to reduce the error of artificial judgment and realize the objective judgment of wave propagation time.
The results show that when the maximum amplitude-frequency of stress wave is about 50 Hz to 100 Hz, the downhole seismic method is suitable to use complex Gaussian, complex Morlet, and the cross-hole seismic method is suitable to use complex Gaussian and complex Morlet. The error between the results of the transformation result and artificial judgment is less than 3%.

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