Distribution Characteristics and Analytical Method of Dynamic Stress on Subgrade of Ballastless Track for High-Speed Railway

被引：0
|
作者：
Ye Y. [1 ,2 ]
Cai D. [1 ,2 ,3 ]
Wei S. [1 ,2 ,3 ]
Yu L. [4 ]
Shi Y. [1 ,2 ,3 ]
Wang L. [1 ,2 ,3 ]
机构：
[1] China Academy of Railway Sciences Corporation Limited, Beijing
[2] State Key Laboratory for Track Technology of High-Speed Railway, China Academy of Railway Sciences Corporation Limited, Beijing
[3] Railway Engineering Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing
[4] Geological Subgrade Consulting Department, China Railway Economic and Planning Research Institute, Beijing
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2020年 / 41卷 / 06期
关键词：
Analytical method; Ballastless track; Distribution characteristics; Dynamic stress on subgrade; High-speed railway; Measuring analysis;
D O I：
10.3969/j.issn.1001-4632.2020.06.01
中图分类号：
学科分类号：
摘要：
Through the field measurement, numerical simulation and analytical analysis of more than 20 test sections of Beijing-Tianjin, Wuhan-Guangzhou, Beijing-Shanghai, Zhengzhou-Wanzhou and Beijing-Shenyang high speed railways, it was concluded that one loading and unloading process of high-speed train load on the ballastless track subgrade was composed of two axle loads of a bogie, and the dynamic stress of subgrade surface presented the characteristics of longitudinal trapezoid and transverse uniform distribution. A simplified model for the dynamic load distribution of ballastless track foundation was proposed, in which two axle loads of one bogie were regarded as concentrated forces multiplied by a dynamic coefficient of 1.35 as the design dynamic loads. When it was transferred to the top surface of the bearing layer or base plate, the distribution was triangular in the longitudinal direction, with the action range of 3.5 m. Along the transverse direction, the load was evenly distributed on both sides with no action load in the range of 0.85 m in the middle, and the action width was the width of track slab. Based on Odemark's modulus and thickness equivalent assumption, the bearing layer or base plate, the surface layer and bottom layer of subgrade were homogenized. The Boussinesq formula was used to obtain the dynamic stress of the subgrade, and the analytical method for calculating the dynamic stress of ballastless track subgrade was established. Through the proposed method, the dynamic stresses for the subgrades of CRTS I, CRTS Ⅱ, CRTS III slab tracks and double-block ballastless track were calculated. The results were in good agreement with the numerical and measured results, which verified the rationality of the analytical method. © 2020, Editorial Department of China Railway Science. All right reserved.
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页码：1 / 9
页数：8
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