本研究以C.K.C.動力三軸儀，針對試體的原狀與重模狀態進行動態性質試驗，係採用台南歸仁地區現地取樣方式獲得之高品質不擾動土樣，並在試驗過程中改變不同圍壓狀態下，探討原狀試體與重模試體間的液化阻抗、剪力模數與剪應變、液化後體積應變之影響；最後彙整本研究與所蒐集的台灣西南半部粉土質砂之相關資料，並針對其基本物性、微觀結構、礦物成分及液化阻抗之影響等方面探討。
據研究結果顯示，於動態行為方面，在相同細粒料含量及圍壓下之原狀試體液化阻抗較重模試體來的高，並由剪力模數與剪應變圖可知原狀試體抵抗外力及吸收能量之能力較重模試體來的佳；在體積應變方面，不論圍壓大小，液化後原狀試體之體積變化較重模試體來的小。
由彙整資料顯示台灣西南部地區，粉土質砂比重範圍為2.67-2.75之間，且皆呈無塑性(NP)或低塑性(PI＜4)狀態；自然含水量與液性限度相當接近，為高靈敏性土壤之一；平均粒徑D50約在0.48-0.06mm之間，此結果與Seed(1967)與Lee&Fitton (1968)分別所提有關發生液化的指標和範圍，均與其吻合。在動態性質方面，原狀試體之液化阻抗隨細粒料含量增加而提高，重模試體則隨細粒料含量增加而液化阻抗隨之降低，其強度衰減會隨著細粒料含量的增加而增大；強度衰減率部分會隨試體的緊密狀態會有所改變，緊密狀態試體液化阻抗衰減率會比中等緊密狀態來的小。

The main purpose of this study is to study the influence of disturbance effect of soil samples on the liquefaction resistance of soil. The dynamic triaxial tests were conducted under different confining pressures to investigate the liquefaction resistance, shear modulus, shear strain and volume change after liquefaction of both undisturbed and remolded samples. The high-quality of undisturbed samples were collected in Kueiren area near Tainan City.
Based on test results, the liquefaction resistances of undisturbed samples were higher then those of remolded samples under the same fine content and same confining pressures; In compassion to the capability of absorbing the applied energy to the soils, the undisturbed samples were better then remolded once and volume changes of samples after liquefaction, the undisturbed samples were smaller then the remolded samples. According to test date of silty soil there collected from southwestern of Taiwan, the specific gravities of silty sand were ranging from 2.67 to 2.75. Most of silty sands were nonplastic or low plastic with plastic index lower than 4; Then liquid limits of the sands were near the field water contents and can be cataloged as sensitive soil. The mean grain sizes were in between 0.48mm and 0.06mm. The range of grain size was coincided with the range of grain size that were senstive to be liquefied.
The liquefaction resistances of undisturbed samples were increasing as the fine content of sample increase on the contrary, the resistances of remolded samples were decreasing as the fine content of sample increases. The rate of liquefaction resistance of a dense specimen is smaller then that of a intermediate dense specimen.

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