轻质橡胶颗粒-砂混合土的压缩性试验研究

Experimental Study on Compressibility of Lightweight Granulated Rubber-Sand Mixtures

通过单向压缩试验,研究了橡胶颗粒-砂混合土中橡胶颗粒的压缩性以及不同橡胶掺量混合土的压缩性.为确定混合土中橡胶颗粒自身的压缩性,配制了与橡胶颗粒同级配的纯砂试样,将纯橡胶试样压缩量减去纯砂试样压缩量,得到了混合土中橡胶颗粒自身的压缩量.同时,依据混合土中橡胶颗粒和砂颗粒各自的压缩曲线,考虑混合土的压缩量等于橡胶颗粒自身压缩量与孔隙减小量之和,采用更为合理的体积分数来表达橡胶颗粒的掺量,建立了一种混合土的压缩模型,并与试验结果进行了对比验证.结合模型和试验结果发现,橡胶颗粒掺量的界限质量分数为20%,工程应用中不应超过此临界值.

Through uniaxial compression test,the compressibility of rubber particles in the lightweight granulated rubber-sand mixtures and the compressibility of mixed soil with different contents of rubber particles were studied.In order to determine the compressibility of the rubber particles in the mixed soil,the pure sand particles with the same grade as the rubber particles were prepared.By subtracting the compression amount of the pure sand sample from the compression amount of pure rubber sample,the compression amount of the rubber particles in the mixed soil was obtained.At the same time,according to the respective compression curves of rubber sample and sand sample,considering that the compression amount of the mixed soil is equal to the sum of the compression amount of rubber particles and the reduction amount of pores,a more reasonable volume fraction was proposed to express the mixing amount of rubber particles,and a compression model of the mixed soil was established,which was verified by comparison with the test results.Combined with the model and test results,it was found that the limiting mass fraction of rubber particles was 20%,which should not be exceeded in engineering application.