台灣位處於環太平洋地震帶，每年發生地震的次數頻繁且大小不一，而近年來西部沿海地區有多處的填海造陸的海浦新生地，其地質多屬疏鬆之砂性土壤，地震來臨時易有土壤液化現象發生，雖然目前對於液化潛能方面的研究成果相當豐碩，但是對高粘土及粉土細粒料含量的砂性土壤之液化行為及體積變形的研究尚未有定論，故本文藉由各種不同粘土及粉土細粒料含量的砂性土壤進行液化特性之探討，進而針對其液化後試體體積變化的行為做研究。
本文主要是以不同的粉土及粘土細粒料含量與細粒料粒徑為變因，來探討土壤所表現的液化特性、液化阻抗強度與液化後的體積應變狀況。第一部分是研究液化破壞與粉土或粘土細粒料含量間的關係，並探討初始液化與軸向應變；第二部分在建立液化阻抗曲線，以瞭解細粒料含量及細粒料特性對液化潛能的影響程度；最後，藉由液化阻抗曲線來研究土壤的變形行為，由實驗結果繪出時間及體積應變( )的關係，獲得在不同種類細粒料及不同細粒料含量情形下，兩者間的差異。
根據試驗結果顯示，土壤的液化阻抗會隨著粉土含量的增加而降低，當粉土含量超過45%時，其液化阻抗會趨向一定低值；而當添加粘土細粒料時，其液化阻抗能力會隨著粘土含量的增加而增加，且在粘土含量超過45%時，其液化阻抗亦會趨向一定高值；除此之外，液化阻抗也會隨著細粒料塑性或試體本身塑性的提高而上升。在體積應變的方面，在不改變相對密度的狀況下，液化後體積應變會隨著粉土細粒料含量的增加而變大，但會隨著粘土細粒料的增加而降低。

The main objective of this research was compare the behavior of liquefaction and liquefaction resistance and the volumetric strain after liquefaction for different fine content and the diameter of fines. In the first, study the relation between liquefaction failure and fine content; and than, we try to establish liquefaction resistances curve, to understand the fine content and the character of fines how to affect the liquefaction restances; at last, based on liquefaction resistances curve to research the behavior of the soil deformed, according to the test result to draw the relationship between time and volumetric strain.
The test result show that the liauefaction resistances of silty sand decrease as the silt content increase, but when the silt content more than 45%, the liquefaction resistances tend to low value. When we increase the clay content, the liquefaction resistances of clay sand increase as the clay content increase. And when the silt content more than 45%, the liquefaction resistances tend to high value. In addition, the liquefaction resistances were increase as the plastic of the fines and specimens. Based on the test result, in the same relative densities, the volumetric strain increase as the silt content increase, but decrease as the clay content decrease.

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