饱和橡胶颗粒-砂混合料的动力学特性

Dynamic Behavior of Saturated Rubber Particle-Sand Mixture

将废旧轮胎加工粉碎后与砂混合制成橡胶颗粒砂混合料,并对其进行了循环三轴试验研究.结果表明:随着橡胶掺量(wR)的增大,橡胶颗粒砂混合料破坏振次(N^(f))呈先减小后增大的趋势,在循环应力比不同的条件下,N^(f)达到最小值所需的橡胶掺量有所差异;随着橡胶掺量的增大,橡胶颗粒砂混合料双幅剪应变幅值与循环振次比的关系曲线由突变增长型慢慢过渡到线性增长型;当w R=0%~20%时,橡胶颗粒砂混合料的动力学特性与纯砂相似;当w R=30%~50%时,随着橡胶掺量的增大,橡胶颗粒砂混合料的动力学特性由砂土向橡胶颗粒逐步转变;当橡胶掺量超过70%时,橡胶颗粒砂混合料的动力学特性与纯橡胶颗粒一致.

Mixture containing rubber particle from wasted tire and sand was prepared and a series of cyclic triaxial tests were conducted.The results show that with the increase of rubber content(w^(R)),the failure vibration(N^(f))increases at first then decreases.Also,the rubber content corresponding to the failure vibration differs from different cyclic stress ratios.When rubber content increases,the curves of the relationship between the double-shear strain amplitude and the cyclic vibration ratio gradually transform from abrupt growth type to linear growth type.Meanwhile,it is found that rubber content has a significant effect on the main dynamic characteristics of mixtures.When w R=0%20%,the rubber particle-sand mixture is similar to pure sand.With w R=30%50%,the dynamic characteristics of mixture gradually change from sand to rubber particles as rubber content increases.When rubber content exceeds 70%,the characteristics of the mixture are consistent with pure rubber particles.Based on the basic theory of micro-soil dynamics and the characteristics of energy dissipation,the experimental phenomena and their laws are preliminarily explained.