台灣地理位置位於板塊交界帶，造就地震頻繁的發生，當地震時飽和砂土層受地震力作用激發超額孔隙水壓，使得土壤失去應有強度進而引發土壤液化，造成鄰近建物受損。近年來評估土讓液化的方法非常多種，其中超額孔隙水壓比(??)為經常作為判斷土壤液化的指標之一。 地動強度量值為描述地震時地表運動之特性，依據定義的不同，因此具有許多不同特性的強度量值，本研究使用七組地動強度量值結合加速度門檻值的概念進行計算，因此一共具有90個強度量值作為參賽者，探討何種地動強度量值與超額孔隙水壓比關係最佳。 本研究利用中央大學地工離心機與振動台於60g重力場下進行試驗，模擬18m自由場飽和砂土層受震行為，並以1-D地盤反應分析軟體DEEPSIOL進行驗證，結果顯示，DEEPSOIL模擬的超額孔隙水壓比與離心試驗結果相似，因此可以判斷DEEPSOIL模擬之結果具有一定的參考價值。 由強震測站場址工程地質資料庫(EGDT)中取得高雄9個測站真實土層資料，以DEEPSOIL建立土層並使用100筆振動事件進行地盤反應分析，針對其超額孔隙水壓比之結果，與90個地動強度量值進行比較，結果顯示，CAV7 與孔隙水壓激發關聯性最佳，PGA 關聯性則是最低。;This study investigated the relationship between pore water excitation in soil and a number of different ground motion intensity measures (e.g., PGA). The calculation of pore pressure in soil was on the basis of using DEEPSOIL, a computer program for ground response analysis. In this investigation, a centrifuge test was conducted for verifying the DEEPSOIL computation, showing that the measured pore pressure from the centrifuge test was close to the computation from DEEPSOIL. This study shows that the correlation between pore pressure excitation in soil and PGA was poor. By contrast, pore pressure excitation in soil had a stronger correlation with cumulative absolute velocity (CAV) of earthquake ground motions. In particular, pore pressure excitation in soil had the best correlation with CAV7, inferring that low amplitudes of ground motions would not induce pore pressure excitation in soil.
