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中文摘要：
以西昌经久乡昔格达组粉砂和黏土为研究对象,借助室内动三轴试验,对粉砂和黏土动剪切模量阻尼比特性进行研究。分析试验结果表明：粉砂和黏土的动剪切模量Gd均随动剪应变γd增加而减小,阻尼比D均随动剪应变γd增加而增加,且两者均趋于稳定。动剪切模量Gd均随固结围压σ3c或固结主应力比Kc的增加而增加,且增大趋势明显;阻尼比D均随固结围压σ3c或固结主应力比Kc升高而略有降低,减小趋势相对不明显;黏土在10-5～10-2应变范围内等压状态下阻尼比D的三种趋势线窄带要比偏压状态下要宽,即等应变下参数值D变化等压状态要大于偏压状态。粉砂和黏土Edmax（Gdmax）均有随σ3c和Kc的增大而增大,且数值增加趋势明显;Dmax均随σ3c和Kc的增大而减小,但减小微弱。两种土样在等压固结和偏压固结条件下Gd/Gdmax和D/Dmax的三条曲线均集中于一条窄带内,且无论是粉砂还是黏土,等压固结条件下的实验点相对于偏压固结条件要发散;等压固结状态下,σ3c越小,Gd/Gdmax越小,D/Dmax越大;偏压固结状态下,Kc越小,Gd/Gdmax越小,D/Dmax越大。粉砂的动剪切模量相对较高,阻尼比相对较小,故其动力特性相对较好,相对不易产生动力破坏。
英文摘要：
Characteristics of dynamic shear modulus and damping ratio of silt and clay of the Xigeda Group in Xichang are examined by means of indoor dynamic triaxial tests. The results show that the dynamic shear modulus Gdof the silt and clay decreases with the increasing dynamic shear strain γd. The damping ratio D increases with the increasing dynamic shear strain γd,and both tend to be stable. The dynamic shear modulusGdincreases with the increasing confining pressure σ3cor consolidation principal stress ratio Kc,and the increasing trend is evident. The damping ratio D slightly decreases with the increasing confining pressure σ3c or consolidation principal stress ratio Kc,and the reducing tendency is relatively insignificant. As the clay＇s strain state is at 10-5- 10-2,the damping ratio D＇s three trend lines fall in a narrowband under the isobaric consolidation conditions,whichseems to be wider than that of the bias consolidation pressure conditions,namely,changes in parameter D under isostatic state is more than that under the bias conditions. The silt and clay＇s Edmax（ Gdmax） increases with the increasing σ3cand Kc,and the trend is clearly. Dmaxdecreases with the increasing σ3cand Kc,but the decrease is weak. Modulus-damping ratio＇s three curves of the two kinds of soil samples under the isobaric consolidation conditions and the bias consolidation pressure conditions fall in a narrow band,and whether it is silt or clay,the test point under isobaric consolidations relatively diverges to that of the bias. In the isobaric consolidation states,the smaller the σ3c,the lower the Gd/Gdmax,and the greater the D /Dmax. But in the bias consolidation pressure states,the smaller the Kc,the lower the Gd/Gdmax,and the greater the D /Dmax. The dynamic shear modulus of silt is relatively high,and the damping ratio is relatively small. Thus the dynamic characteristics are relatively good and relatively difficult to produce dynamic failure.
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