摘要
无砟轨道几何形位满足要求、轨道刚度连续均匀是列车高速平稳运行的根本保障条件,作为支承轨道的线下基础必须持久稳定、坚固。路基与桥、隧构筑物连接处是高速铁路线路相对薄弱的环节。如何做好路基与桥、隧构筑物之间差异沉降的控制与刚度匹配的协调是无砟轨道铁路建设的技术关键。本文从轨道刚度与线下基础刚度的关系入手,讨论了线下基础纵向刚度的匹配问题以及实现路基过渡段纵向刚度匹配的技术关键、技术路径。提出更高速无砟轨道铁路需进一步强化线下基础的刚度匹配,实现过渡段纵向刚度匹配需要做好轨道结构与线下基础的协同设计,做好线下基础的纵断面设计,优先采用减小路基与桥、隧等构筑物沉降与刚度差异的结构措施。
The satisfactory ballastless track geometry and the continuous and uniform track rigidity are the fundamental guarantee conditions for the smooth running of trains at a high speed.The substructure supporting the track must be enduringly stable and solid.The joints between subgrade and structures of bridge and tunnel are the relatively weak parts of high-speed railway lines.How to control the differential settlement between subgrade and structures of bridge and tunnel and coordinate the rigidity matching is the technical key for the construction of the ballastless track railways.Starting from the relationship between track rigidity and substructure rigidity,this paper discusses the longitudinal rigidity matching of substructure and the key technical issues and technical path to realizing the longitudinal rigidity matching of the subgrade transition section.It is proposed that the rigidity matching of substructure shall be further strengthened for the higher-speed ballastless track railways.In order to realize the longitudinal rigidity matching of the transition section,it is necessary to carry out the collaborative design of track structure and substructure,improve the vertical section design of substructure,and preferentially take the structural measures of reducing the settlement and rigidity difference between subgrade and structures such as bridge and tunnel.
作者
魏永幸
刘秀波
吴细水
WEI Yongxing;LIU Xiubo;WU Xishui(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu610031,China;China Academy of Railway Sciences Corporation Limited,Beijing100081,China;China State Railway Group Co.,Ltd.,Beijing100844,China)
出处
《高速铁路技术》
2021年第2期39-42,共4页
High Speed Railway Technology
基金
中铁二院工程集团有限责任公司科技发展计划项目(KSNQ202060)。
关键词
无砟轨道
线下基础
刚度匹配
差异沉降
设计协同
ballastless track
substructure
rigidity matching
differential settlement
design collaboration
