本研究係以C.K.C.動力三軸儀，採用彰化縣員林鎮崙雅里之民安宮前取樣之土壤，在控制不同的整體孔隙比下，逐步改變重模試體的細粒料含量，並進行動態三軸試驗，以探討整體孔隙比與細粒料含量對於粉質砂土動態行為之影響；之後再彙整本研究與所蒐集的台灣中南部粉質砂土之相關資料，並針對其基本物性、微觀結構、礦物成分及動態強度之影響等方面做進一步的整合、比較與探討，以更全面的描述細粒料含量對於粉質砂土動態強度之影響。
本試驗之結果顯示，在相同整體孔隙比下，粉質砂土的最大剪力模數與動態強度會隨著細粒料含量的增加而降低，特別在細粒料含量15%-30%區間有大幅衰減的行為，而當細粒料含量超過60%時，則有漸趨於一定值的走向。大體而言，細粒料含量為60%之試體，其動態強度約比純淨砂土試體降低25%。其次，據本試驗與翁華鴻(1997)、簡宏濱(1998)等針對台南七股地區土壤動態特性之研究均指出，在砂性土壤中細粒料含量高時，最大剪力模數與動態強度之相關性不高。
最後由彙整的資料顯示，台灣中南部地區粉土質砂比重範圍為2.67-2.75之間，且大多呈無塑性(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；而平均粒徑D50約在0.08 mm～0.70 mm之間，均座落在Seed(1967)所提之易發液化之區間內。而在動態強度的探討方面，隨細粒料含量增加將呈現「逐漸下降」、「逐漸上升」以及「先下降後上升」等三種截然不同的趨勢。

In this study, dynamic triaxial tests were conducted by CKC cyclic triaxial test system. The sand with fines content were collected in Yuanlin of Changhua. The samples are prepared by moist tamping and the fines content of sample will be gradually adjusted under different global void ratio. The purpose of this study is to investigate the effect of global void ratio and fines content on the dynamic behavior of silty sands. The study will also integrate the data from this project and researches of silty sands collected in the central and southern Taiwan, and especially focus on the comparison and discussion of basic properties, micro-structure, mineral composition and dynamic strength within those data.
According to the test results, the maximum shear modulus and dynamic strength of samples decrease with increasing fines content of samples. It declines between the range from 15% to 30% of fines content. As the fines content of samples over 60%, the maximum shear modulus and dynamic strength would gradually tend to a constant value. Generally speaking, the dynamic strength of the samples with fines content of 60% approximately reduces 25% of that of the samples with pure sand.
According to the date, the specific gravity 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. The liquid limits of the sands were nearly the same as the field water contents, and it can be cataloged as sensitive soil. The mean grain sizes were in between 0.08mm and 0.7mm. The range of grain size was coincided with the range of grain size which were senstive to be liquefiable. In the exploring of dynamic strength, the result show that three completely different trends including, they are "a gradual decreasing", "a gradual increasing", and "a first decreasing then increasing ".

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