本研究先採集曾文溪沿岸五處河堤鄰近高灘地土壤，分別為尖山堤防、日新護岸、東昌堤防、寮部堤防及蘇厝堤防，進行物理性質試驗，發現組成成分主要為無塑性之粉土質砂，且其土壤粒徑分布均在容易發生土壤液化的粒徑分布範圍之內，因此，有需要進一步探討其動態行為與液化阻抗，接著採用日新護岸河灘地土壤做為試驗土樣，進行動態三軸試驗，以改變細粒料含量、相對密度與添加泥岩材料等方式來討論其抗液化強度的改變，並以應力應變曲線來分析各個土壤材料之動態行為。
　　試驗結果顯示，日新護岸乾淨砂之抗液化強度比日新護岸土壤之抗液化強度還要高，其液化阻抗上升了約91%。若改變日新護岸土壤之相對密度，以相對密度33%、50%、70%之試體來進行試驗，日新護岸土壤之抗液化強度會隨著相對密度的增加而有上升的趨勢，這兩種方式皆對日新護岸土壤抗液化的能力有會有明顯成效。而添加泥岩添加物之取代量分別為10%與30%，當泥岩取代量10%時，與取代量為0%比較，液化阻抗下降了約10%，而泥岩取代量30%時，與取代量為0%比較，液化阻抗上升了約6%左右，可以看到添加泥岩後對提升日新護岸土壤抗液化能力的效果不彰。

In this study, the collection of soil samples was conducted at five areas along the Tsengwen River banks, including the Jianshan Embankment, Rishin Embankment, Dongchang Embankment, Liaobu Embankment, and Sucuo Embankment. The soil samples were examined through physical properties to the discovery that they are mainly composed of non-plastic silty sands. Particle size distribution curves then allowed analyses to determine whether the samples are liquefiable. Next, soil from the Rishin Embankment riverbank was selected as the sample to perform dynamic triaxial tests, and through methods such as altering the fine content, relative density, and adding mudstone, changes in its liquefaction resistance were explored. Finally, the dynamic behavior of each soil sample was analyzed through the stress-strain curve.
　　The result suggests that, compared to the soil of the Rishin Embankment, its clean sand has better liquefaction resistance, increasing approximately 91%. As the relative density of the soil of the Embankment is respectively increased from 33%, 50%, to 70%, the liquefaction resistance correspondingly displays an upward trend. Therefore, both methods can notably strengthen the liquefaction resistance of the Rishin Embankment soil. In contrast, adding mudstone appears to be ineffective in strengthening the liquefaction resistance of the soil. Compared with a sample with 0% mudstone, when the mudstone content is increased to 10%, the liquefaction resistance drops roughly 10%, whereas it increases around 6% when the mudstone content is increased to 30%.

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