高速铁路路基沥青混凝土结构研究现状及发展趋势

Research Status and Development Trend of Asphalt Concrete Structure of High-speed Railway Subgrade

为提升中国高速铁路路基工程品质和服役水平,围绕结构型式、材料性能、设计方法、应用情况及效果等四大主题,系统梳理了国内外高速铁路路基沥青混凝土结构的研究现状、工程应用及存在问题,探讨高速铁路路基沥青混凝土结构的发展趋势。分析结果表明:全断面沥青混凝土结构应视为基床表层的组成部分,可降低基床结构的应力水平,改善轨道-路基系统的振动特性,兼具防水、承载、减振、降噪、隔离等功能,且在全生命周期内具有明显的技术经济性优势。指出高速铁路路基沥青混凝土结构适应于“一带一路”沿线复杂气候条件的配制技术、基于结构和性能的设计方法、长期服役性能评价、轨道与路基结构体系优化等发展趋势。

In order to improve the quality and service level of high-speed railway subgrade engineering in China, focusing on the four major themes of structure type, material performance, design method, application and effect, this paper systematically sorted out the research status, engineering application and existing problems of railway asphalt concrete structure at home and abroad, and discussed the development trend of high-speed railway subgrade asphalt concrete structure. The analysis results show that the full-section asphalt concrete structure should be regarded as a part of the surface of the subgrade, which can reduce the stress level of the subgrade structure, improve the vibration characteristics of the track-subgrade system, and has prominent technical and economic advantages in the whole life cycle with the functions of waterproofing, bearing capacity, vibration reduction, noise reduction and isolation. Finally, it is pointed out that the research on the preparing technology that adapts to the complex climatic conditions along “the Belt and Road Initiatives”, the design method based on structure and performance, the evaluation of long-term service performance, the structure optimization of track and subgrade system, etc. are the future development trends of high-speed railway subgrade asphalt concrete structure.