基于粉碎性黄土环境的砂岩类弃渣在路面基层中的应用研究

Research on Application of Sandstone Spoils in Pavement Base Basedon Pulverized Loess Environment

目前砂石材料供应难以满足高等级公路建设需求,同时,公路、隧道施工过程中产生大量岩石类弃渣。为解决砂石材料短缺和弃渣占用土地问题,依托昔榆高速公路工程具体标段,在将弃渣砂岩作为路基材料使用的基础上,对弃渣砂岩进行母材预选,通过试验研究弃渣砂岩的物理力学性能,探索用于路面基层的母材,并对其进行组成设计与性能优化,提高砂岩基层力学性能。通过试验研究探索出适用于粉碎性黄土环境的砂岩破碎筛分工艺,将砂岩弃渣加工制备成稳定性良好、硬度较高的砂岩集料,满足路面基层、底基层强度等设计要求,代替普通石灰石集料用于制备砂岩路面基层材料,为项目建设提供充足的碎石资源,且具有良好的经济效益、生态效益。

At present,the supply of sand and gravel materials is difficult to meet the demand of high road construction,at the same time,a large amount of rock waste is produced during the construction of roads and tunnels.In order to solve the shortage of sand and stone materials and the occupation of land by waste slag,relying on the specific section of Xiyang-Yuci Expressway project,on the basis of using abandoned sandstone as roadbed material,the base material of the abandoned sandstone is preselected,the physical and mechanical properties of abandoned sandstone were studied through experiments,and the base material used for pavement base was explored.The composition design and performance optimization were carried out to improve the mechanical properties of sandstone base.The process of sandstone crushing and screening suitable for pulverized loess environment is explored through experimental research,the sandstone waste slag is processed into sandstone aggregate with good stability and high hardness,the design requirements of pavement base and base strength is met,instead of ordinary limestone aggregate,it is used to prepare sandstone pavement base material,which provides sufficient gravel resources for project construction,and has good economic and ecological benefits.