加勁擋土牆因施工簡單，耐震能力佳，且能抵抗較大的差異沈陷等優點，已逐漸取代傳統重力式擋土牆，成為擋土設施的主流，台灣也大量的使用加勁擋土牆於邊坡穩定。而在921集集地震當中，有許多的結構物遭到破壞，其中也包含加勁擋土牆，因此對於加勁擋土牆於動態載重下的行為，有必要做進一步的了解。
　　因此，本研究以二維有限差分法程式FLAC（Fast Lagrangian Analysis of Continua），建立數值模型，牆體考慮為二維平面應變狀況，並使用Duncan（1980）提出的雙曲線土壤模數模型來修正不同圍壓下的土壤模數，而以莫爾庫倫元素與二力桿件元素模擬背填土壤及加勁材。
　　首先選擇Perez（1999）於華盛頓大學所做的振動台試驗進行動態行為之模擬，模擬的結果與試驗量測到的牆面變位、牆體位移等，進行比對。確定了此模型在模擬動態行為可達一定的合理範圍之後，接著再針對加勁擋土牆之內部設計因子做參數分析，並探討各種動態載重之參數，分析對加勁擋土牆牆面變形，加勁材內部應力狀態等之影響，藉以更進一步了解加勁擋土牆動態行為。
　　結果發現，加勁材埋設長度對於加勁擋土牆的動態行為有顯著的影響，埋設長度越長可有效的減低牆面變形；而所輸入的振動頻率若接近擋土牆的自然頻率，則影響會特別明顯。

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