摘要
　　本研究針對砂質土層承受地震後之沉陷分別以飽和砂層及乾砂土層兩種情況進行研析。在飽和砂土層方面，本研究基於不同理論的三種評測方法：(1)在某一定值的剪應變下，土壤的體應變將隨著震動所造成的剪應變增大而增大的Ishihara評測法；(2)伴隨著液化後超額孔隙水壓消散而導致的體應變，配合程式GeoStudio進行的壓密沉陷評測法；(3)本研究提出之液化後體應變有關的土壤各性質參數關係。在乾砂土層方面，本研究採Tokimatsu and Seed評測法及Pradel評測法，並提出改良之綜合法。

　　在飽和砂土層液化後沉陷量評測方面，本研究以集集地震時彰濱崙尾地區和Nevada sand砂土層的離心機試驗做為Ishihara評測法、壓密沉陷評測法及土壤參數關係評測法等三種評測方法的驗證及模擬實例；在乾砂土層受震後沉陷的評測方面，則以離心機試驗模擬Nevada sand乾砂土層受EL Centro earthquake後之沉陷量資訊做為Tokimatsu and Seed評測法、Pradel評測法及綜合法的模擬數據。

　　在飽和砂土層的研究結果發現土壤參數評測法可概略評估崙尾地區在集集地震時的液化後沉陷量，在Nevada sand飽和砂土層的評估則更為精確；乾砂土層的研究結果以綜合法比較出Pradel評測法的不合理處，且以本文之數據資料得出綜合法的沉陷量評測結果亦優於Pradel評測法；綜合法之評測過程則優於Tokimatsu and Seed評測法。

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