Abstract: 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.

Key words: Waste tire particles, Tailings, Dynamic strength, Dynamic elastic modulus, Damping ratio, Shock absorption and vibration isolation