台灣地區在1999年集集地震時粉質砂土層發生大規模的液化現象，可以發現細料(通過200號篩之材料)影響著土壤的力學特性。本研究的目的是了解不同細料含量的乾砂，其動態性質的變化。研究方法為使用不同含量之無塑性細料乾員林砂利用共振柱試驗來求得其動態特性，研究設定不同的細料含量(乾淨砂、15%、30%、50%)、孔隙比(e = 0.7、e = 0.8、e = 1.0)在不同圍壓階段下來進行試驗。試驗的結果顯示，員林砂隨細料含量的增加，剪力模數會先下降後上升，而孔隙比越小，細料含量對剪力模數的影響越顯著；阻尼比的改變則不明顯。

Liquefaction phenomenon had been observed in the silty sand layer in Taiwan Chi-Chi earthquake, 1999. It can be found that the fines material (the material passing through No. 200 sieve) impact on the mechanical behavior of dynamic soil properties. The purpose is to study the effects of the different fines content on dynamic properties of dry silty sand. Resonant column test was used to obtain the dynamic properties of non-plastic fine dry Yuanlin sand, by setting different of fines content (clean sand, 15%, 30%, 50%), void ratio (e = 0.7, e = 0.8, e = 1.0) at different stages of confining pressure. The results show that the shear modulus will firstly increase with fines content then decline. The smaller void ratio, the more significant of fines content on the shear modulus. However, the varying of damping ratio was not obvious.

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