921地震時台灣地區粉質砂土層發生大規模的液化現象，其中發現含細粒料（通過200號篩顆粒）砂土有獨特力學特性。本研究的目的為探討不同細料含量對飽和砂試體其動態性質的影響。研究方法為使用低塑性細料飽和員林砂控制不同細粒料含量（乾淨砂、15%、30%、50%）與不同孔隙比（e = 0.7、e = 0.8、e = 1.0）在不同圍壓下（50 kPa、100 kPa、200 kPa）利用共振柱試驗求其動態特性，最後再以一原樣試體與重模試體比較。試驗的結果顯示，員林砂在孔隙比為0.7時隨細料含量的增加剪力模數會下降，而孔隙比為0.8、1.0時，剪力模數隨細料含量先下降在30%有最低點50%又升高；細粒料含量對阻尼比的影響則不明顯。而比較原樣試體與重模試體正規化剪力模數衰減曲線，發現其趨勢十分吻合。

Liquefaction phenomenon had happened in western Taiwan widely during 921 earthquake, 1999. It was found that the fines material (the material pass through No. 200 sieve) is an important influence factor in the liquefaction area. This study focuses on the effects of different fines content (FC) on the dynamic properties of saturated specimen. The material tested is low plastic Yuan-Lin sand (YLS). The fines content considered are 5%, 15%, 30%, and 50%, while the void ratios considered are 0.7, 0.8, and 1.0. The resonant column apparatus is used to measure the dynamic properties of saturated reconstituted specimen in different confining pressure. The results show that the shear modulus of the reconstituted specimen decreases with increasing the fine content as the void ratio at 0.7. And, the shear modulus will firstly decrease as FC at 30%, however, it will increase with FC at 50% for the void ratio equal to 0.8 and 1.0. The effect of FC on damping ratio is insignificant. The result also shows that the normalize shear modulus attenuation curves matches well when comparing with undisturbed specimen and reconstituted specimen.

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