本研究使用Stokoe固定–自由型式共振柱儀器，試驗土樣採用台灣彰化近海鑽探取得砂質海床土壤，利用濕搗法製作重模試體進行共振柱試驗，以不同孔隙比(e = 0.7、0.8與0.9)、細粒料含量(FC = 15%、30%與50%)與飽和度(S = 15%、30%、60%與100%)在不同有效圍壓(Pc = 20 kPa、80 kPa與320 kPa)狀態下進行高、低振幅試驗以及自由振動衰減試驗，透過試驗所求得剪力模數與阻尼比等參數，與動力三軸試驗之剪應變範圍連接，獲得完整動態特性曲線，以探討海床土壤其動態特性受上述四種因素之影響。
其結果顯示完整動態特性之正規化剪力模數衰減曲線，對孔隙比及有效圍壓來說其衰減趨勢隨著剪應變增加影響愈不顯著，細粒料含量反之，而對飽和度來說不論其應變範圍，衰減趨勢皆為飽和度上升衰減趨勢趨緩。完整動態特性之阻尼比曲線，孔隙比與飽和度兩者隨剪應變增加其趨勢與小應變時完全相反，有效圍壓隨剪應變增加受有效圍壓之影響逐漸消失，而不論其應變範圍阻尼比皆隨細粒料含量增加而上升。

In this research, the Stokoe-type fixed-free end resonant column apparatus was exploited to obtain the dynamic properties of reconstituted specimens by moist tamping method. The soil samples were sandy seabed soils which extracted from the offshore near Changhua, Taiwan. The specimens with different void ratio (e = 0.7,0.8 and 0.9), fines content (FC = 15%, 30% and 50%) and degree of saturation (S = 15%, 30%, 60% and 100%) in the different stages of confining pressure (Pc = 20 kPa, 80 kPa and 320 kPa) were conducted in low amplitude test, high amplitude test and free vibration decay method to acquire the shear modulus and the damping ratio. This study integrates (1) the resonant column and dynamic triaxial data to comprehensively characterize the complete dynamic property curves and (2) discussion on the influence of the above mentioned four factors on the dynamic properties of sandy seabed soils.
As characterized in resonant column and dynamic triaxial tests, normalized shear modulus reduction curve demonstrates that void ratio and confining pressure exhibit less influence than fines content does with increasing shear strains. Moreover, normalized shear modulus reduction curve rises with increasing degree of saturation, which is applicable in every shear strain region. Also, the damping ratio declines with increasing void ratio and degree of saturation at small strains but raises at large strains as observed in damping curve from resonant column and dynamic triaxial tests. The confining pressure is insensitive with increasing shear strains. Noteworthy, damping curve elevates with increasing fines content in every shear strain region.

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