【摘要】 将橡胶粉干质量百分比分别设定为6%、9%和15%这3种配合比,重塑橡胶粉-黄土混合土试样,采用动三轴试验系统对橡胶粉-黄土混合土试样进行了不固结不排水三轴剪切试验,研究了橡胶粉对重塑黄土动力特性的影响规律。试验结果表明:混合土动弹性模量随橡胶粉含量的增加而逐渐降低,混合土的最大动弹性模量Edmax与最大动剪切模量Gdmax随橡胶粉含量的增加而明显降低;当动剪应变γd在0～0.002范围内时,橡胶粉含量对动剪切模量比Gd/Gdmax影响不大,当动剪应变γd大于0.002时,混合土的Gd/Gdmax随着橡胶粉含量的增加而增大;动剪应变γd在0～0.01范围内时,阻尼比变化幅度很大,当动剪应变γd大于0.01后,阻尼比趋于稳定;混合土最大阻尼比随橡胶颗粒含量的增加而增大。更多还原

【Abstract】 Manipulated loess and rubber powder was mixed with percentage of rubber powder as 6%,9% and 15% respectively.Triaxial shear test on manipulated loess sample was conducted by dynamic triaxial test system under unconsolidated and undrained condition,and the influence of rubber powder on the dynamic mechanic properties was studied.The results show that the dynamic modulus(Ed) of manipulated loess decreases with the increment of rubber powder percentage,and the maximum dynamic modulus(Edmax) and dynamic shear modulus(Gdmax) decrease significantly with the increment of rubber powder percentage.The influence of rubber powder percentage on the dynamic shear modulus ratio(Gd/Gdmax) is not obvious when the dynamic shear strain(γd) is in the range of 0 and 0.002 but the dynamic shear modulus ratio(Gd/Gdmax) increases with the increment of rubber powder percentage when the dynamic shear strain(γd) exceeds 0.002.When the dynamic shear strain(γd) is in the range of 0 and 0.001,the damping ration changes significantly.When the dynamic shear strain(γd) exceeds 0.01,the damping ratio tends to be steady and the maximum damping ratio of manipulated loess increases with the increment of rubber powder percentage.更多还原