大跨斜拉桥高速铁路无砟轨道适应性研究-《高速铁路技术》

文章信息/Info

Title:: Research on Adaptability of Ballastless Track of High-speed Railway with Long-span Stayed-cable Bridge

Author(s):: QIN Yan; China Railway Shanghai Design Institute Group, Shanghai 200070, China

Keywords:: high-speed railway|stayed-cable bridge|theoretical analysis|ballastless track|adaptability

摘要:: 本文基于有限元的方法，建立了斜拉桥上双块式无砟轨道精细化模型，分析了特大桥上无砟轨道在温度及桥梁挠曲变形作用下的适应性，并运用动力学理论分析了其行车动力学响应。分析结果表明：（1）温度荷载下，大跨斜拉桥轨道结构层间铺设土工布比设置弹性垫层受力更为不利，部分区域出现层间离缝脱空现象；（2）7.9 m与6.4 m板长轨道变形与桥梁变形趋势基本一致，但抗拉工况下7.9 m板比6.4 m板受力更为不利，受力状态亦更加复杂；（3）大跨桥梁挠曲变形对道床板受力影响不大，二者整体变形协调较为一致，在高速行车条件下，脱轨系数和轮重减载率等动力学指标均满足规范要求。研究结果可为大跨斜拉桥上无砟轨道的优化设计与平顺性研究提供参考。

Abstract:: Based on the finite element method, a refined model of CRTS double-block slab track on cable-stayed bridge is established, and the adaptability of slab track on super large bridge under the action of temperature and deflection deformation of bridge is analyzed, then dynamics response of train is analyzed by using dynamics theory. The results are as follows:(1) Under the temperature load, the stress of laying geotextile between layers of the track structure of long-span cable-stayed bridge is more unfavorable than setting elastic cushion, and the gap between track layers in appeared in some areas. (2) The deformation trend of tracks on 7.9m and 6.4m slabs are basically the same as that on the bridge, but the stress of 7.9 m slab is more unfavorable than that of 6.4m slab under the tensile conditions, the stress state is more complex. (3) The flexure deformation of the large-span bridge has little effect on the stress of the bed slab, and the deformation of the two is consistent. Under the high-speed operation, the dynamic indexes such as derailment coefficient and wheel load reduction rate cab meet the requirements in the code. The research results can provide references for the optimal design and smoothness study of ballastless track on long-span cable-stayed bridge.