本研究利用現地所取回之不擾動土樣進行一系列動力三軸試驗，用以探討現地土壤之液化強度與震陷特性。不擾動土樣包含薄管土樣與塊狀土樣兩種，以粉質砂土為主。此外，本文亦蒐集其他本土砂土之液化強度資料並與本研究試驗結果比較，發現砂土的液化強度範圍約SR20≒0.17~0.31。 本研究利用再壓密試驗結果探討現有三種液化後震陷評估法之關係圖表，並各依其程序探討集集地震所引致地盤沈陷之案例，以期工程界在選擇評估法時有所助益。 In this paper, a series of undisturbed samples were carried out in a sandy deposit at central Taiwan. Laboratory physical tests and cyclic traxial tests were then conducted to obtain the basic properties, volumetric strain and cyclic resistance. The in-site samplings consisted of tube sampling during boring and block sampling in a pit. Besides, the others cyclic resistance of in-site undisturbed samples also was collected and compared with the outcome of this study. It was found that the scope of the cyclic resistance(SR20) of in-site sandy soil ranges between 0.17 and 0.31. To investigate related charts suggested by three methods about estimation of earthquake-induced settlements in saturated sand deposits, the volumetric strain obtained from re-consolidation test would be analyzed with relative density and the maximum shear strain. These test data and conclusions may provide a valuable base for seismic design in a foundation soil with sandy soils.
