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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。
The rubber powder - loess mixed soil samples were remolded by using three kinds of mixture ratios of 6%, 9% and 15% Unconsolidated undrained triaxial shear tests were carried out to study the influence of rubber powder on the dynamic characteristics of remolded loess. The results show that the elastic modulus of mixed soil decreases with the increase of rubber powder content. The maximum dynamic elastic modulus Edmax and maximum dynamic shear modulus Gdmax of mixed soil decrease with the increase of rubber powder content. When the strain γd is in the range of 0 ~ 0.002, the rubber powder content has little effect on the dynamic shear modulus than Gd / Gdmax. When the dynamic shear strain γd is greater than 0.002, the Gd / Gdmax of the mixed soil increases with the rubber powder content When the dynamic shear strain γd is in the range of 0 ~ 0.01, the damping ratio changes greatly. When the dynamic shear strain γd is greater than 0.01, the damping ratio tends to be stable. The maximum damping ratio of the mixed soil increases with the increase of the rubber particle content Big.