本研究使用反覆單剪試驗進行側向應變控制之K_0壓密動態試驗，試驗土樣為台灣彰化近海取得之含細粒料砂土，以濕搗法架設重模試體，探討有效圍壓、孔隙比、飽和度及細粒料含量四種因素對彰濱海床土壤大應變之動態性質的影響，並從反覆單剪試驗之數據估計彰濱海床土壤之尖峰強度，分析最大剪應力與影響因素之關係，及比較單剪試驗與直剪試驗之摩擦角差距。
試驗結果顯示，飽和度影響剪力模數隨細粒料含量增加的趨勢方向，只有在土壤緊密且飽和度低於30%時，剪力模數隨細粒料含量增加而上升，土壤鬆散或飽和度較高時，剪力模數隨細粒料含量增高而下降，且門檻細粒料含量受到飽和度影響，而飽和試體之剪力模數曲線衰減較非飽和試體劇烈。細粒料含量較高之試體在飽和度較低、土壤顆粒緊密的情況下阻尼比較小，阻尼比隨孔隙比增加、隨飽和度增加而上升；而正規化剪力模數衰減曲線及阻尼比曲線大部分位於Seed and Idriss (1970)建議範圍之下界以下。反覆單剪試驗數據所估計之彰濱海床土壤尖峰強度，可能較實際尖峰強度高約4% ~ 15%，而最大剪應力隨孔隙比增加而下降，且飽和度越大，最大剪應力隨細粒料含量增高而下降的趨勢增大。單剪試驗之摩擦角明顯小於直剪試驗之摩擦角，而細粒料含量越高，單剪試驗之摩擦角隨孔隙比增大而下降之趨勢越劇烈。

This research uses the cyclic simple shear test to conduct a transverse strain-controlled dynamic test of anisotropic compaction. Analysis of fine-grained sand from Changhua, Taiwan, and remolded specimens was made by wet tamping method. Discuss the effects of effective confining pressure, void ratio, saturation, and fines content on dynamic properties of seabed soil under large strain. In addition, using the stress-strain data obtained from the experiment to estimate the peak strength of the seabed soil, analyzing the variation of the maximum shear stress with the factors, and comparing the friction angle of the simple shear test and the direct shear test.
The experimental results show that saturation affects the trend change of shear modulus with increasing fine aggregate content. Only when the soil is dense and the saturation is less than 30%, the shear modulus increases with the increase of fines content. And the threshold of fines content is affected by saturation. In addition, the shear modulus decay curve of the saturated sample decays the most. The damping ratio increases with decreasing mean effective confining pressure, increasing void ratio and increasing saturation. The estimated peak strength of the seafloor soil from the cyclic simple shear test data may be about 4-15% higher than the actual value, and the maximum shear stress decreases with increasing void fraction. The maximum shear stress decreases with the increase of fines content, and the trend is more obvious with the increase of saturation. The friction angle of the simple shear test is significantly smaller than that of the direct shear test, and the friction angle of the simple shear test decreases with the increase of porosity, and this trend is more obvious with the increase of fines content.

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