将废旧橡胶轮胎破碎后与砂混合形成橡胶砂作为轻型回填材料用于岩土工程领域,是目前处理废旧轮胎最有前途的措施之一。为了研究橡胶砂的压缩特性,本文开展了透明橡胶砂的一维压缩试验,探究了橡胶砂的变形机制,并建立橡胶砂压缩特性表征模型。结果表明:橡胶砂的总竖向应变随着橡胶掺量的增加而增加,塑性应变大于弹性应变；相比纯砂,橡胶砂压缩变形的增量主要来源于橡胶颗粒自身压缩变形以及橡胶颗粒变形导致周围砂颗粒滚动重排引起的变形；基于纯砂及橡胶的压缩模型,建立了不同橡胶掺量下的橡胶砂压缩特性表征模型,该模型具有较好的适用性。本文的研究结果可为橡胶砂的工程应用提供科学支撑。

Using crushed waste rubber tires mixed with sand as a lightweight backfill material in geotechnical engineering is one of the most promising measures to deal with waste tires. In order to study the compressive characteristics of rubber sand, this paper conducted one-dimensional consolidation compression tests on transparent rubber sand to investigate the deformation mechanism of rubber sand and established a characterization model of rubber sand"s compressive characteristics. The results show that the total vertical strain of rubber sand increases with the increase of rubber content, and the plastic strain is greater than the elastic strain. Compared with pure sand, the increment of the compressive deformation of rubber sand mainly comes from the compression deformation of rubber particles themselves and the rolling rearrangement of sand particles caused by the deformation of rubber particles. Based on the compression models of pure sand and rubber, a compressive characteristic characterization model of rubber sand with different rubber content was established, and the model has good applicability. The research results can provide scientific support for the engineering application of rubber sand.

南京市交通运输科技项目(2022)