由於我國位處於太平洋地震帶西環，每年大小地震不斷，而在台灣西南部沖積平原中，仍然有相當多的斷層存在，一旦發生強烈的地震，沿海地震下陷區之沖積飽和砂土層，極易發生液化並引發災害。
1999年921集集大地震造成我國災情慘重，除了奪走二千餘條寶貴生命外，也發生多處建物倒塌、港灣液化、邊坡滑動。其中，員林、彰濱等地液化情形相當嚴重，更引起國人對地震液化災害與防制的關注與重視。
　　基於此，本研究使用動態三軸試驗針對砂質土壤資料分別施做反覆三軸不排水試驗、壓密排水試驗、壓密不排水試驗及定值平均正向有效應力試驗，進而回饋於有限元素分析程式(SUMDES)中，藉此來探討與模擬土壤液化後之沉陷量、孔隙水壓變化及地表加速度。另外，經由經驗式液化沉陷量的分析與現地觀測沉陷量來進行比較與探討。研究結果顯示，本研究藉由數值模擬所得之沉陷量較經驗式更接近於現地觀測之液化後沉陷量，本研究完成近60組各不同應力路徑之三軸試驗，並成功的運用數值模式之模擬出沉陷量，將可擴展應用於大地工程理論與實務設計時之參考。

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