为了解高速铁路轨下基础结构的动力适应性,在系统回顾轨下基础结构分析发展历程的基础上,通过有限元数值积分方法,建立了遂渝线无砟轨道路基模型,分析了列车运行速度、轴重及基床表层弹性模量对基床表层动应力、竖向动位移和竖向加速度等动力响应的影响规律,探讨了无砟轨道在列车轮载作用下的结构行为.研究表明:基床的结构性能直接影响轨下基础的结构状态,有必要加强轨下基础结构;新型轨下基础结构(如沥青混凝土整体道床)可以很好地满足无砟轨道结构和功能的要求,应作为重点研究方向之一.%To discuss the adaptivity of track substructure of high-speed railway, the historical development of the structural analysis and design of track substructure was reviewed as the numerical analysis basis of the structural behavior of ballastless track substructure with a case study of Sui-Yu (Suining-Chongqing) high-speed railway. Dynamic responses of track substructure under the action of train loading were investigated using a finite element software, and the effects of train speed, axle loading and trackbed elastic modulus on the dynamic stress, vertical deflection and vertical acceleration of track bed were researched. The research results show that a sound track bed is essential to assure structural integrity and performance of railway lines and an asphalt railway substructure may be a good alternative.
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