我国废旧轮胎数量众多，形成的黑色污染日益加剧，将废旧轮胎回收再利用是消纳轮胎的途径之一。废旧轮胎具备强度高、耐腐蚀等良好的土建材料特性，研究其在路基中的作用，对于指导废旧轮胎加筋路基工程建设具有重要意义。然而，现有的研究主要集中在轮胎碎片的再利用，对废旧轮胎整胎再利用的研究较少。为了进一步探究轮胎之间的连接以及填料类型对整胎加筋路基的影响，开展了三组模型试验探究废旧轮胎加筋路基的承载变形特性，分析了竖向荷载作用下路基顶面位移、内部土压力分布以及轮胎应变。研究结果表明：轮胎加筋层有利于附加应力的扩散，并且随着荷载增大，轮胎加筋层扩散应力的作用逐渐增强。在轮胎加筋层下方布设土工格栅有效增加了加筋区的整体刚度，减小了路基变形，二者共同作用使加筋区附近土体的附加应力的扩散角增大，并且土工格栅分担了部分竖向荷载，使轮胎变形减小。

The large number of waste tires in our country has led to increasingly severe black pollution. Applying waste tires to engineering is one of the ways to dispose of tires. Waste tires have good engineering properties, such as high strength and corrosion resistance. Studying their role in subgrade construction is of great significance for guiding the construction of reinforced subgrades with waste tires. However, existing research mainly focuses on the reuse of tire fragments, and there is insufficient research on the reuse of whole tires. In order to further investigate the connection between tires and the influence of fillers on the whole tire reinforced subgrade, three model tests were conducted to explore the deformation characteristics of waste tire reinforced subgrades. The subgrade top surface displacements, vertical soil pressures, and tire strains under different stress levels were analyzed. The research results indicate that the tire reinforcement layer is conducive to the distribution of additional stress, and as the load increases, the role of the tire reinforcement layer in distributing stress gradually strengthens. Laying geogrids below the tire reinforcement layer effectively increases the overall stiffness of the reinforced zone and reduces subgrade deformations. The combined effects of the tire and geogrid increases the distribution angle of additional stress in the soil near the tire reinforced zone, and geogrids share some loads, reducing tire deformations.

TU411;U414

国家自然科学基金项目（面上项目，重点项目，重大项目）