橡胶砂混合土静力特性试验

Experiment on static characteristics of rubber sand mixed soil

为了研究橡胶颗粒掺量和粒径对橡胶砂混合土抗剪强度的影响,对不同粒径的橡胶颗粒与砂土混合配置成橡胶砂混合土进行了三轴固结排水剪切试验。结果表明:在砂土掺入橡胶颗粒可提高土体抗剪强度,混合土的强度随着橡胶颗粒掺量的增加呈现先增大后减小的趋势,掺量为30%时强度最大,而当橡胶颗粒掺量达到40%后,混合土强度呈现显著降低趋势;1~3 mm粒径的橡胶颗粒与细砂组成的混合土的抗剪强度最大,且掺入1~3 mm粒径橡胶颗粒的混合土强度优于掺入2~4 mm橡胶颗粒的混合土;橡胶砂应力应变曲线呈应变软化特征,随着橡胶颗粒与砂土粒径比的增大,其应力应变曲线软化特性逐渐明显;橡胶砂混合土破坏应变随橡胶颗粒掺量的增加呈递增趋势。

With the characteristics of light weight,good strength and elasticity,rubber sand mixed soil can improve the shear strength of the sand.In order to study the influence of rubber particle content and size on the shear strength of mixed soil,which consists of different sizes rubber particles with sand,the triaxial consolidation drainage shear tests were carried out.It is concluded that by adding rubber particles into sand,the shear strength of the soil can be improved.The shear strength of the mixed soil increases first and then decreases with the rubber particle content.The maximum shear strength of the mixed soil is 30%,and the strength shows a significant decrease trend when the rubber content reached 40%.The shear strength of the mixed soil is greatest when the soil is mixed by 1-3 mm rubber particles with fine sand.The strength of the mixed soil mixed with 1-3 mm rubber particles is better than that mixed with 2-4 mm rubber particles.The stress-strain curve of rubber sand shows strain softening characteristics.With the increase of the rubber sand particle size ratio,the softening characteristic of stress-strain curve is gradually obvious.The failure strain of rubber-sand mixed soil increases with the increase of the content of rubber particles.