台灣在1999年發生集集大地震，芮氏規模7.3，當時在粉土質砂質發生大規模的液化現象，其中發現含細粒料(通過200號篩顆粒)砂土有獨特力學性質。本研究的目的為探討在不同細粒料下飽和之粉質砂土最大剪力模數(G_max)與不排水剪力強度(S_u)之相關性。研究方法為使用低塑性細粒料飽和員林砂，並控制不同細粒料含料(15 %、30 %、50 %)與不同孔隙比( e = 0.7、0.8、1.0 )在不同為壓下( 50 kPa、100 kPa、200 kPa )及加軸差應力時不同應變量(ε= 5 %、7 %、10 %、15 % )下，利用彎曲元件(bender element)求其剪力波速(V_s)。試驗結果顯示，在孔隙比為0.7時隨細粒料含量的增加剪力波速會下降，而孔隙比0.8、1.0時剪力波速隨細粒料含量增加先下降，在30%有最低點50%又升高的趨勢；在加軸差的過程中量測不同應變量之剪力波速，結果發現相同細粒料含量下，在量測之不同應變量下，孔隙比越大剪力波速越慢；最後嘗試探討最大剪力模數與不排水剪力強度之相關性。

Liquefaction phenomenon had happened in western Taiwan widely during Chi-Chi earthquake, 1999. It was found that the fines material
(the material pass through No.200 sieve) is an important influence factor in the liquefaction area.
The study focuses on the effects of fines content on undrained shear strength and maximum shear modulus. The material tested is low plastic Yian-Lin sand (YLS). The fines content considered are 15 %, 30 %, 50 %, while the void ratios considered are 0.7, 0.8, 1.0, in different confining pressure and different strain amplitude deviator stress increases. The bender element apparatus is used to measure the shear wave velocity in the above situation.
The results show that the shear velocity of the reconstituted specimen decreases with increasing the fines content (FC) when the void ratio is 0.7. And, the shear wave velocity will firstly decrease as FC at 30%, however, it will increase on FC at 50% for the void ratio equal to 0.8 and 1.0.The results also showed that the greater the void ratio, the slower shear wave velocity.

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