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铺设锁定轨温差对高原铁路无缝道岔受力特性影响

高原 杨东升 王树国

高原, 杨东升, 王树国. 铺设锁定轨温差对高原铁路无缝道岔受力特性影响[J]. 西南交通大学学报. doi: 10.3969/j.issn.0258-2724.20230222
引用本文: 高原, 杨东升, 王树国. 铺设锁定轨温差对高原铁路无缝道岔受力特性影响[J]. 西南交通大学学报. doi: 10.3969/j.issn.0258-2724.20230222
GAO Yuan, YANG Dosheng, WANG Shuguo. Influence of Stress-Free Temperature Difference on Force Characteristics of Seamless Turnouts in Plateau Areas[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230222
Citation: GAO Yuan, YANG Dosheng, WANG Shuguo. Influence of Stress-Free Temperature Difference on Force Characteristics of Seamless Turnouts in Plateau Areas[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230222

铺设锁定轨温差对高原铁路无缝道岔受力特性影响

doi: 10.3969/j.issn.0258-2724.20230222
基金项目: 中国国家铁路集团有限公司科技研究开发计划合同重大课题(K2021G026)
详细信息
    作者简介:

    高原(1994—),男,博士研究生,研究方向为道路与铁道工程,E-mail:563021287@qq.com

  • 中图分类号: U213.6

Influence of Stress-Free Temperature Difference on Force Characteristics of Seamless Turnouts in Plateau Areas

  • 摘要:

    为研究高原地区铺设无缝道岔的可行性与高原气候环境对跨区间无缝线路稳定性的影响,探讨了不同气候、不同海拔和不同结构型式道岔实现无缝化时,铺设锁定轨温差对无缝道岔力学特性的影响. 首先,基于高原铁路自然地理环境与线路运营条件,选取青藏线升级改造过程中实现无缝化的典型道岔作为研究对象;其次,结合不同结构形式下的道岔关键传力部件力学特性开展室内参数测试,掌握高原气候低温环境对扣件、道床等阻力的影响;最后,构建考虑多场耦合和塑性阻力的无缝道岔计算模型,揭示铺设轨温差与无缝道岔受力变形的关系. 研究结果表明:当线路所处温差越大,铺设锁定轨温差引起的基本轨温度附加力增加速率从4.5 kN/℃(达琼果站)增加到6 kN/℃(唐古拉北站);无缝道岔与相邻线路或相邻道岔间的铺设锁定轨温差对无缝道岔受力与变形影响较大,而线路轨节/道岔轨节铺设锁定轨温差引起的横向位移增加速率从0.010 mm/℃(达琼果站)增加到0.011 mm/℃(唐古拉北站),左右轨与直侧轨铺设轨温差对道岔失稳影响较小;考虑到高原道岔涉及多股钢轨锁定,易造成锁定轨温差相差较大,为提高安全冗余,铺设锁定轨温差应控制在±3 ℃,相邻轨节锁定轨温差不超过5 ℃.

     

  • 图 1  轨温和气温测量结果

    Figure 1.  Measuring results of rail temperature and temperature

    图 2  不同扣件型式下的阻力测试

    Figure 2.  Resistance test under different types of fasteners

    图 3  不同扣件型式

    Figure 3.  Different types of fasteners

    图 4  不同扣件型式下的阻力测试

    Figure 4.  Resistance test under different types of fasteners

    图 5  低温条件下扣件阻力测试

    Figure 5.  Resistance test of fasteners under low temperature

    图 6  道床阻力测试

    Figure 6.  Resistance test of ballast bed

    图 7  直线和曲线工况下的道床阻力

    Figure 7.  Ballast bed resistance under straight and curve line conditions

    图 8  道岔计算模型

    Figure 8.  Calculation model of turnout

    图 9  铺设锁定轨温差对无缝道岔受力与变形的影响

    Figure 9.  Influence of stress-free temperature difference on force formation of seamless turnout

    图 10  铺设锁定轨温差对无缝道岔稳定性的影响

    Figure 10.  Influence of stress-free temperature difference on stability of seamless turnout

    表  1  典型试验车站

    Table  1.   Typical experiment stations

    站名 海拔/m 纬度/(°) 线路条件
    唐古拉北 4955 34.2 最低温、最高海拔车站
    那曲 4500 31.6 西藏段、较高海拔
    达琼果 4375 30.5 低纬度、较高海拔,类似川藏条件
    望昆 4484 35.7 青海段、高纬度、较高海拔
    下载: 导出CSV

    表  2  典型车站轨温预测

    Table  2.   Prediction of rail temperature in typical stations

    站名 年气温/℃ 预测轨温/℃ 验证数据 R
    唐古拉北 −45.23~24.75 −45.22~35.84 0.9498
    那曲 −38.02~27.28 −37.26~42.18 0.9652
    达琼果 −10.04~31.06 −6.84~49.68 0.9857
    望昆 −26.52~35.58 −24.32~54.63 0.9728
    下载: 导出CSV

    表  3  限位器和间隔铁阻力测试

    Table  3.   Resistance test of limiting stopper and filler

    对象 螺母扭矩/(N·m) 最大滑移荷载/kN
    限位器 800 345
    1000 462
    间隔铁 800 364
    1000 486
    下载: 导出CSV

    表  4  接头阻力测试

    Table  4.   Resistance test of joints

    接头 夹板扭矩/(N·m) 最大荷载/kN
    胶接冻结接头 800 799
    1100 1110
    普通接头 800 307
    1100 442
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-05-09
  • 修回日期:  2023-06-30
  • 网络出版日期:  2024-07-09

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