土壤液化潛能分析法中，簡易經驗評估法為工程界所常利用。這一類分析方法對於地震所引致剪應力之計算多涉及地震規模和地表加速度，以往許多研究皆將兩個參數指定一保守數值來進行分析，但土壤液化是一種全面而廣泛的現象，地表加速度隨著距離震源越遠而遞減，對於廣泛區域之液化分析，將上述兩參數固定雖有其簡化分析之效果，但較不具合理性。基於此，本研究嘗試引入地震能量的觀點來評估液化潛勢，運用震波能量(seismic wave energy)原理來探討斷層帶周邊土層液化發生的可能性。本研究使用三種不同的方式來預估地震能量：方法一係將國外學者所提出的能量經驗公式進行推導並計算地震能量；方法二利用數值模擬評估程式SUMDES計算受震時，土層中的超額孔水壓增量，代入經驗公式中計算地震能量；方法三利用倒傳遞類神經網路模擬地震加速度傅立葉頻譜，並積分求得地震能量。本研究運用多變量分析中的判別分析與自行定義兩種方式訂定液化判別分界線，用以判定相對於特定能量與 值下液化與否。另外，藉由統計學中的 常態分佈與多變量中的判別分析計算液化機率，配合現場試驗數據，建立液化評估之經驗準則，並據以發展風險評估模式。本研究結合地理資訊系統的空間繪圖功能，展繪出液化潛勢分區圖。研究結果顯示本研究提出之評估模式有合理之液化評估能力，將可擴展應用於大地工程理論與實務設計時之參考。

This paper presents a seismic wave energy-based method with back-propagation networks to assess the liquefaction probability. The empirical equation and Fourier spectrum are employed respectively to calculate the seismic wave energy. The discriminant analysis is used to determine the equation in separating the cases with and without liquefaction. The results reveal that the proposed method shows capability in evaluating the probability of soil liquefaction based on the established boundary line and the application of logarithm normal distribution. Furthermore, the geography information system is utilized to geographically present the liquefaction potential and the maps compare favorably to in situ liquefaction areas induced by 1999 Chi-Chi earthquake in central Taiwan.

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