Analysis of Large-slope Metro Turnout Rail Creeping under Cycling Loads Action

WANG Tian; MA Qiantao; ZHENG Zhao-guang; YANG Jian; FANG Jiasheng; CHEN Rong; XU Jingmang

doi:10.16037/j.1007-869x.2024.07.033

Chengshi guidao jiaotong yanjiu (Jul 2024)

Analysis of Large-slope Metro Turnout Rail Creeping under Cycling Loads Action

WANG Tian,
MA Qiantao,
ZHENG Zhao-guang,
YANG Jian,
FANG Jiasheng,
CHEN Rong,
XU Jingmang

Affiliations

WANG Tian: China Railway Construction South China Construction Co., Ltd., 511458, Guangzhou, China
MA Qiantao: MOE Key Laboratory of High-Speed Railway Engineering, Southwest Jiaotong University, 610031, Chengdu, China
ZHENG Zhao-guang: MOE Key Laboratory of High-Speed Railway Engineering, Southwest Jiaotong University, 610031, Chengdu, China
YANG Jian: MOE Key Laboratory of High-Speed Railway Engineering, Southwest Jiaotong University, 610031, Chengdu, China
FANG Jiasheng: MOE Key Laboratory of High-Speed Railway Engineering, Southwest Jiaotong University, 610031, Chengdu, China
CHEN Rong: MOE Key Laboratory of High-Speed Railway Engineering, Southwest Jiaotong University, 610031, Chengdu, China
XU Jingmang: MOE Key Laboratory of High-Speed Railway Engineering, Southwest Jiaotong University, 610031, Chengdu, China

DOI: https://doi.org/10.16037/j.1007-869x.2024.07.033
Journal volume & issue: Vol. 27, no. 7
pp. 191 – 196

Abstract

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Objective When turnouts are laid on slope, the longitudinal force increase on the track due to the cyclic braking of trains will cause uneven rail creeping phenomena， resulting in a more complex stress and deformation pattern for the turnout, and even affecting its normal service. Therefore, it is necessary to study the characteristics of stress and deformation of large-slope turnout rails under cyclic braking loads. Method Tests on fastener longitudinal resistance under CLA (cycling loads action) are conducted, and a non-linear finite element model of the No.9 turnout is established to analyze the turnout rail creeping pattern under CLA. Result & Conclusion The fastener system exhibits resistance degradation under CLA. The maximum creep of the turnout rail occurs after the first train braking. Under CLA, the cumulative increase in rail creeping gradually stabilizes with the increasing number of CLA. The presence of slope will significantly increase rail creeping amount under CLA. The train loading form has minimal influence on turnout rail creeping under cycling braking loads action.

Published in Chengshi guidao jiaotong yanjiu

ISSN: 1007-869X (Print)
Publisher: Urban Mass Transit Magazine Press
Country of publisher: China
LCC subjects: Technology: Engineering (General). Civil engineering (General): Transportation engineering
Website: https://umt1998.tongji.edu.cn/

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