土石壩體材料之動態特性為評估壩體於地震反應時，安全性分析所需之重要參數。由於試驗室所取得的土樣其應力狀態和現地情形已不相同，且試體代表性不足，因此進行現地試驗有其必要性。現地試驗常使用之鑽孔震測法量
測時需事先鑽孔且需變換接收器位置，除試驗過程耗時費用高外，鑽孔對壩體安全影響之風險亦難以評估。表面波譜法(Spectral Analysis of Surface Wave method，簡稱SASW) 為近年來新發展之現地震測方法，為使用脈衝震源產生雷利波，利用頻散曲線求取土層剪力波速剖面。利用SASW進行試驗僅需將受波器安置於土層表面無需鑽孔，震波對於土層產生之應變範圍屬微小應變 (γ<0.001%)，為一種非破壞性檢測方法，可以快速、經濟的求取土層動態參數。
於現地試驗時使用不同震源及受波器間距，比較各試驗參數之影響，同時佈設多個受波器量測以取得現地完整頻散曲線。分析時利用改良式平均演算法求得平均頻散曲線，並以改良Satoh近似反算法求得土層試算參數進行正向模式反算分析，為評估SASW應用於土石壩體動態參數特性之適用性，本文針對曾文水庫及阿公店水庫之土石壩體進行SASW之試驗研究，並和其他震測法試驗結果進行分析比對。最後依據研究結果提出結論與建議。
研究結果顯示，表面波譜法推估之土層剪力波速剖面與壩體土層分佈圖趨勢相當吻合，可有效判讀土層材料分佈剖面，與下孔式探測法之平均差異值約6.2%。顯示利用表面波譜法可於不破壞土石壩體結構條件下，求得壩體材料剪力波速及剪力模數等動態參數，為一經濟快速有效的壩體材料動態參數檢測評估法。

It is required to determine the dynamic properties of the subject material in the evaluation of earth dam’s response during earthquakes. There are laboratory methods and in-situ seismic methods to measure the dynamic stiffness of earth dam materials. The laboratory test methods usually suffer from the effects of factors such as sample disturbance, alteration of state of stress and non-representative samples. Therefore, it is preferable to measure the properties using in-situ seismic methods. In-situ seismic methods such as cross-hole and down-hole tests have been proven to be the reliable. Unfortunately, the need of boreholes makes these methods too expensive or time consuming. They are extremely difficult to use when site conditions is difficult to install the boreholes.
The spectral analysis of surface wave method (SASW) is an in-situ seismic method which is recently developed. This method uses a transient impact to generate Rayleigh wave on the ground surface, and measures the ground surface response to determine the shear wave velocity profiles of soil deposits. This study includes field measurement of dispersion curves to evaluate shear wave velocity profiles of soil. Different impact sources were used to generate broad frequencies domain, and multi-receivers were used to determine the complete dispersion curve in this study. By applying a forward model for the inversion process, the profile parameters obtained using the modified Satoh’s method was compared with those of using down-hole test method.
The dissertation presents the results on the study of in-situ investigation of Tseng-Wen and A-Gung-Dian earth dam using SASW method. The results show that the deviation is within 6.2% between SASW method and the down-hole test data. It is show that SASW method can evaluate the dynamic properties of earth dam quickly and cost effectively.

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