本研究以自行研發之室內三軸圓錐貫入試驗(Triaxial Cone Penetration Test, TCPT)，求取浚填砂土在特定有效圍壓下，不同細粒料含量之圓錐阻抗qc (Cone Resistance)，同時以反覆三軸試驗(CTT)求取相對應土樣達初始液化時所需之反覆剪應力比，本文以反覆加載週期數Nc=15之反覆剪應力比(Cyclic Stress Ratio, CSR)定義為土壤之抗液化能力，以進行兩者之關連性比較。試驗結果顯示，三軸圓錐貫入阻抗qc與土壤之抗液化能力有良好之關連性，並發現土樣之qc與液化阻抗，隨著細粒料含量0%至10%增加至最大值，而當細粒料含量從10%增加至50%時，則均呈降低之現象。為瞭解細粒料之影響，本研究同時利用掃瞄電子顯微取像技術(SEM)和X光繞射(XRD)來解釋上述之現象。發現土樣中細粒料之含量與其特性在其液化阻抗上扮演了重要的角色。最後以三軸圓錐貫入試驗所獲得之(qc)peak，帶入所推得之關係式，預測土壤液化阻抗皆有良好的一致性。

This paper presents a quick and cost-effective method to evaluate the liquefaction resistance of reclaimed soils. A particular device modified from conventional triaxial compression test apparatus, namely “Triaxial Cone Penetration Test (TCPT)”, was developed to obtain the cone resistance under certain confining pressure so as to correlate the liquefaction resistance of the corresponding soil. The liquefaction resistance is defined as the Cyclic Stress Ratio (CSR) of the reclaimed soils under cyclic loading number (Nc)=15. A well correlation was found eventually. Besides, both (qc)peak and liquefaction resistance increased to the maximum values with fine content of soils increasing from 0 % to 10 % and then decreased with fine content increasing to 50 %. The techniques of Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD) were adopted to explain the above phenomenon. It is found that the fine content and its characteristics play an important role on the liquefaction resistance of the reclaimed soils. Finally, it indicated that the prediction of the liquefaction resistance of soil by using the peak cone resistance is consistent with that from the experiments.

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