循环荷载作用下大坡度地铁道岔钢轨爬行分析
王天1马前涛2,3郑兆光2,3杨健2,3方嘉晟2,3陈嵘2,3徐井芒2,3
Analysis of Large-slope Metro Turnout Rail Creeping under Cycling Loads Action
WANG Tian1MA Qiantao2,3ZHENG Zhaoguang2,3YANG Jian2,3FANG Jiasheng2,3CHEN Rong2,3XU Jingmang2,3
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作者信息:1.中铁建华南建设有限公司，511458，广州
2.西南交通大学高速铁路线路工程教育部重点实验室，610031，成都
3.西南交通大学土木工程学院，610031，成都
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Affiliation:1.China Railway Construction South China Construction Co., Ltd., 511458, Guangzhou, China
2.MOE Key Laboratory of High-Speed Railway Engineering, Southwest Jiaotong University, 610031, Chengdu, China
3.School of Civil Engineering, Southwest Jiaotong University, 610031, Chengdu, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.07.033
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中图分类号/CLCN:U213.6
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栏目/Col:研究报告
摘要:
［目的］当道岔铺设在坡道上时会由于列车的循环制动导致轨道的纵向力有所增加，进而产生不均匀的钢轨爬行现象，使得道岔的受力变形规律更为复杂，甚至会影响道岔的正常服役使用，因此需对循环制动荷载作用下的大坡度道岔钢轨受力变形特征进行研究。［方法］开展了循环荷载作用下的扣件纵向阻力试验，建立了9号道岔非线性有限元模型，分析了循环荷载作用下的道岔钢轨爬行规律。［结果及结论］扣件系统在循环荷载作用下会出现阻力退化现象；在第1次列车制动后，道岔钢轨的爬行量最大；在循环荷载作用下，钢轨累积爬行增长量会随着循环荷载作用次数的增加而逐渐趋于稳定；坡度的存在会显著增大循环荷载作用下的钢轨爬行量；列车荷载形式对循环制动荷载作用下道岔钢轨的爬行量影响很小。
Abstracts:
［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.
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