橡胶-粉土轻质混合土击实及动变形特性研究

Compaction and Dynamic Deformation Properties of Rubber-Silt Lightweight Mixed Soil

将废弃橡胶轮胎颗粒与粉土混合制成轻质混合土,并对其进行击实试验和动三轴试验,基于Davidenkov方程建立了混合土的动弹性模量比-应变本构方程,同时根据经验关系建立了混合土的阻尼比-应变本构方程.结果表明:掺入橡胶颗粒显著减小了橡胶-粉土轻质混合土的最大干密度和最优含水率;当围压相同时,橡胶颗粒掺量越高,混合土的最大动弹性模量越低,动弹性模量比衰减越快;掺入橡胶颗粒显著增大了粉土的阻尼比,当围压相同时,橡胶颗粒掺量越高,混合土的阻尼比越大.

Waste rubber tire particles were mixed with silt to make lightweight mixed soil,and the compaction tests and dynamic triaxial tests were carried out.Based on Davidenkov equation,the dynamic elastic modulus ratio⁃strain constitutive equation of mixed soil was established.The damping ratio⁃strain constitutive equation of mixed soil was established according to the empirical relationship.The results show that the maximum dry density and optimum water content of rubber⁃silt lightweight mixed soil are significantly reduced by adding rubber particles.When the confining pressure is the same,the higher content of rubber particles,the lower the maximum dynamic elastic modulus of mixed soil,and the faster the dynamic elastic modulus decays.The damping ratio of silt is significantly increased by adding rubber particles.When the confining pressure is the same,the higher the content of rubber particles,the higher the damping ratio of mixed soil.