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研究目的:为描述高速铁路结构设计中路基和地基的整体结构性能,提出并解释了路基面支承刚度概念,并对其工程意义及设计检测方法进行探讨。研究结论:路基面支承刚度是无砟轨道结构分析的重要参数,也是实现无砟轨道线下基础纵向刚度匹配的关键指标,可用于描述基床表层顶面对轨道结构地面的结构支承性能,同时也可作为轨道结构对路基结构性能的要求。通过对路基层状体系竖向刚度组合优化设计,可以实现路基面支承刚度的控制;通过不同断面的路基竖向刚度组合设计,可以实现线路纵向刚度调整,实现路基与其它构筑物刚度匹配。路基面支承刚度可通过承载板试验进行测试,承载板面积宜为1.0×1.0m2～1.5×1.5m2。
Research purposes: To describe the overall structural performance of subgrade and foundation in the design of high-speed railway structure, the concept of subgrade support stiffness is proposed and explained, and its engineering significance and design and testing methods are discussed. Research conclusions: The bearing stiffness of the roadbed is an important parameter in the analysis of ballastless track structure and also the key index for matching the longitudinal stiffness of the foundation under ballastless track line. It can be used to describe the structural supporting performance of the top surface of the bedrock on the ground of track structure, Can also be used as track structure of the subgrade structure performance requirements. Through the optimization design of vertical stiffness of subgrade system, the stiffness of subgrade support can be controlled. Through the combination design of vertical stiffness of subgrade in different sections, the vertical stiffness of the line can be adjusted and the stiffness of subgrade can be matched with that of other structures. The bearing stiffness of the embankment can be tested by the bearing plate test. The bearing plate area should be 1.0 × 1.0m2 ~ 1.5 × 1.5m2.