路基上CRTSⅢ型板式无砟轨道结构设计方案分析

Analysis on Design Scheme of CRTSⅢ Slab Track Structure on Roadbed

摘要:

我国在总结新建高速铁路采用的CRTSⅠ型板式、CRTSⅡ型板式和双块式无砟轨道结构型式的优缺点的基础上，提出了CRTSⅢ型板式无砟轨道结构。路基上CRTSⅢ型板式无砟轨道结构存在单元式和纵连式两种设计方案。本文通过建立纵横垂向空间耦合有限元计算模型，对两种设计方案在温度荷载、列车荷载、混凝土收缩及基础沉降变形作用下的力学特性进行了计算与对比分析。计算结果表明，对于严寒地区，考虑温度荷载的影响较大以及轨道的可维修性，建议采用单元式结构。

Abstract:

On the basis of the summary of advantages and disadvantages of the main track types used in newly built high-speed railway in China include CRTSⅠslab, CRTSⅡslab and double-block ballastless track, CRTSⅢ slab ballastless track has been proposed. CRTSⅢ slab ballastless track on roadbed have two design schemes which are unit style and longitudinal continued style. In this paper, longitudinal-transverse-vertical spatial coupled model is established, and the mechanical characteristics of two design schemes under the action of temperature load, vehicle load, concrete shrinkage and foundation settlement deformation are calculated and analyzed. Analysis results show that for the severe cold area, considering the influence of temperature load and maintainability of track, the unit style structure is suggested.