摘要
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：The introduction is given to the integrated structural perforrmance of subgrade and foundation in design of high-speed railway,the explanation is offered to the support stiffness for subgrade surface and the the discussion is made on the meaning in construction and inspection method of the support stiffness.Research conclusions：The support stiffness for subgrade surface is an important parameter for analysis of ballastless track structures and also the key factor for matching the longitudinal stiffness of the foundation under ballastless track.It can reflect the structural support performance of the top surface of roadbed to the track structure surface and it is also as the requested index of the track structure for the subgrade structure.The support stiffness for subgrade surface can be controlled by optimal design of the vertical stiffness of the subgrade bedded system.The longitudinal stiffness of track can be adjusted and matching the stiffness of the subgrade with the other structure can be realized by optimal design of the vertical stiffness of the subgrades with different sections.The support stiffness for subgrade surface can be tested with loading plate and the area of loading plate should be 1.0×1.0 m^2 to 1.5×1.5 m^2.
出处
《铁道工程学报》
EI
北大核心
2010年第7期15-19,24,共6页
Journal of Railway Engineering Society
基金
中铁二院科技发展计划"基于层状体系的无砟轨道铁路路基结构设计理论与应用研究"(097140010)
关键词
无砟轨道
路基面支承刚度
纵向刚度匹配
ballastless track
support stiffness for subgrade surface
match of longitudinal stiffness
