高速铁路基础结构动态性能演变及服役安全的基础科学问题

中国高速铁路已经由大规模建造进入长期安全稳定运营阶段,如何科学维护庞大规模的高速铁路运营线路,使高速铁路长期保持高安全、高稳定、高可靠的运营品质,是我国现阶段面临的重大课题.在分析总结中国高速铁路基础结构构造特点及其复杂运营环境特点的基础上,提出了高速铁路基础结构动态性能演变及服役安全的三个基础科学问题:环境与动载耦合重复作用下高速铁路基础结构关键工程材料与结构动态性能演变,高速铁路基础结构累积变形与轨面几何形态的映射关系,基础结构劣化与高速列车-基础结构耦合系统动态性能的相互影响及演化机制;回顾评述了国内外在此方面的研究现状与最新进展;指出了本领域今后的发展趋势以及需要重点关注和加强的基础研究工作.

Basic scientific issues on dynamic performance evolution of the high-speed railway infrastructure and its service safety

The development of Chinese high-speed railway has entered the new stage of long-term safe and stable operations from the stage of large-scale constructions. How to scientifically maintain the large-scale operating lines, with the aim of holding a high operation quality of the high-speed railway characterized with a high safety, a high stability, and a high reliability during its long-term operation, is a key research task currently faced by China. Based on the summary and analysis of construction characteristics and operation environments of Chinese high-speed railway infrastructures, this paper proposes three key scientific issues on dynamic performance evolution of the high-speed railway infrastructure and its service safety. They include dynamic performance evolution of the critical materials and structures of the high-speed railway infrastructures subjected to repeated train and environment loads, the mapping relationship between the cumulative deformation of the high-speed railway infrastructures and the rail surface geometry, and the interaction and evolution mechanism between the infrastructure deteriorations and dynamic performances of the coupled high-speed train-infrastructure system. Then this paper reviews the current research status and the latest progress on the above three scientific issues, and points out the developing trends and the fundamental research works that need to be focused on and strengthened in the future.