本研究係以C.K.C動力三軸試驗儀，採用高雄苓雅區捷運橘線CO2區段LUO09聯絡通道上方之土壤，針對試體不同的整體孔隙比，藉由變化試體中不同的細粒料含量，先對重模試體施加前期反覆荷重，再進行動力三軸試驗，探討砂土受前期反覆荷重後，整體孔隙比與細粒料含量對於土壤抗液化強度之影響，並在試體破壞後，量測其體積變化，作為日後評估液化後沉陷量的依據。
根據試驗結果發現，在相同的整體孔隙比區間當中，土壤的液化阻抗會隨著細粒料含量的增加而降低，當細粒料含量超過40%時，其液化阻抗有漸趨一定值的傾向。若將試體之雙振幅軸向應變達5%時，即視為液化破壞的定義下，細粒料含量為60%之試體，其抗液化強度約比純淨砂土試體降低25%。
另外，在前期反覆荷重影響方面，針對試體相同的孔隙比區間而言，試體在承受前期反覆荷重後，體積應變與超額孔隙水壓激發百分比均會隨細粒料含量的增加而變大。
最後，在液化後體積應變方面，不論細粒料含量的多寡，液化前整體孔隙比越大的試體，其液化後的體積應變也越大；若以相同的整體孔隙比而言，液化後體積應變會隨著細粒料含量的增加而有上升的趨勢。

In this study, dynamic triaxial tests were conducted by CKC cyclic triaxial test system. The low-plastic sand with fines content over LUO09 areaway of orange line of Kaohsiung Metropolitan Mass Transit. The specimens are prepared by moist tamping at several global void ratio under different fines content. The purpose of this reaserch is to investigate the effect between global void ratio and fines content on the liquefaction resistance of soils after previous cyclic loading. The influence of liquefaction on volumetric strain were also studied for the understanding of the relationship of global void ratio and fines content.

According to the test results, liquefaction resistance of specimens decreases with increasing fines content of samples. As the fines content of samples over 40%, the liquefaction resistance would tend to a constant value gradually. This reaserch defines the liquefaction destruction as the double amplitude axial strain approaching 5% of specimens. The liquefaction resistance of the samples with fines content of 60% approximately reduces 25% than the samples with pure sand.

Besides, the part on the effect of previous cyclic loading, the volumetric strain and excess pore water ratio would both increase with increasing fines content when the specimens of the same global void ratio area are imposed with small previous cyclic loading.

Eventually, irrespective of the fines content, the volumetric strain following liquefaction of the samples is also larger with the samples of larger global void ratio before liquefaction. The volumetric strain following liquefaction of the samples have a rising trend along increasing fines content of samples.

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