废旧轮胎颗粒—尾砂混合土动力特性试验研究

为了探究废旧轮胎颗粒—尾砂混合土的减震隔震效果，在不同轮胎颗粒掺量、不同围压条件下，利用动三轴试验测试分析了混合土的动强度、动弹性模量和阻尼比及其影响规律，对混合土颗粒间的相互作用机制进行了分析，确定混合土中轮胎颗粒的临界掺量范围为4%~8%。研究表明：在相同围压条件下，混合土动强度均小于纯尾砂，且随着轮胎颗粒掺量增加而减小；混合土动弹性模量均低于纯尾砂，且降低明显，轮胎颗粒掺量为4%~8%时，混合土的动弹性模量明显降低，而掺量大于8%时，相同动应变下轮胎颗粒掺量对混合土动弹性模量的影响很小。阻尼比随着围压增大而减小，随着轮胎颗粒掺量增加先增大后有所减小，当轮胎颗粒掺量为4%时，混合土的阻尼比显著增加，当掺量增加到8%、12%时，相同的动应变条件下，混合土阻尼比不再增加反而有所减小。在一定的轮胎颗粒掺量范围内，混合土动弹性模量减小、阻尼比增大，有利于其发挥减震隔震的优势。研究成果可为废旧轮胎颗粒在土工抗震减灾方面的应用提供参考。

Experimental Study on Dynamic Characteristics of Waste Tyre Particles and Tailings Mixed Soil

In order to study the damping effect of waste tire particle-tailed mixed soil，the dynamic strength，dynamic elastic modulus，damping ratio and their influence law of mixed soil were tested by dynamic triaxial test under different tire particle content and different confining pressure.The interaction mechanism between particles of mixed soil was analyzed，and the critical content of tire particles in mixed soil was determined to be 4%~8%.The test results show that under the same confining pressure conditions，the dynamic strength of the mixed soil is less than that of pure tailings，and decreases with the increase of the amount of tire particles； the dynamic elastic modulus of the mixed soil is lower than that of pure tailings， and the decrease is obvious， when the amount of tire particles is between 4% and 8%，the dynamic elastic modulus of the mixed soil is significantly reduced，when the amount of tire particles is greater than 8%，the effect of the amount of tire particles on the elastic modulus of the mixed soil under the same dynamic strain is small.The damping ratio decreases with the increase of the confining pressure，it increases first and then decreases with the increase of the amount of tire particles，when the amount of tire particles is 4%，the damping ratio of the mixed soil increases significantly，when the amount of tire particles increases to 8% and 12%，the damping ratio of mixed soil under the same dynamic strain no longer increases but decreases.Within a certain range of tire particle content， the dynamic elastic modulus of the mixed soil decreases and the damping ratio increases，which is conducive to the advantages of shock absorption and vibration isolation.The above study results can provide a reference for the application of waste tire particles in the earthquake resistance and disaster reduction of the earth.