煤矸石在公路路基工程中的应用研究进展

Research Progress on the Application of Coal Gangue in Highway Subgrade Engineering

煤矸石固体废料用于路基工程建设是绿色低碳交通发展的重要措施.目前煤矸石在公路路基工程中的应用主要包括作为路基填料和公路基层.详细论述了煤矸石在公路路基工程中的应用研究,系统地介绍了我国不同地区煤矸石的化学组成、物理特性和颗粒级配设计的研究进展,总结了公路基层应用中不同稳定材料对煤矸石无侧限抗压强度、抗冻性和干缩性能的影响;同时,概括了路基应用中细颗粒含量、压实参数、含水率等对路基压实特性、抗剪强度和承载比的影响.并通过煤矸石在公路路基工程中研究成果的分析,对煤矸石在路基工程中的研究方向作出展望.

Using coal gangue as a solid waste material for highway subgrade construction is a crucial measure for advancing green and low-carbon transportation.Currently,coal gangue has two main applications in highway subgrade engineering:as subgrade filler and as roadbed base material.This paper introduces the research progress on the chemical composition,,physical characteristics,and particle gradation design of coal gangue in various regions of China,focusing on its application in highway subgrade engineering.The effects of different stabilizing materials on the unconfined compressive strength,freeze resistance,and dry shrinkage of coal gangue used in highway bases are summarized.Additionally,the effects of fine particle content,compaction parameters,and water content on subgrade mechanical properties,such as compaction characteristics,shear strength,and load ratio,are summarized.Finally,based on the analysis of research results on coal gangue in highway subgrade engineering,future research directions are proposed.