高速铁路桥隧过渡段钢轨温度和横向变形试验
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摘要
高速铁路过渡段无砟轨道可能产生以"碎弯"形式出现的钢轨横向变形,影响高速列车运行的平稳性、舒适性和安全性。以合福高速铁路桥隧过渡段为研究对象,对轨温和钢轨横向变形进行长期连续测试与分析,研究结果表明:同一时刻,钢轨沿线不足10 m范围内温差可达20℃以上,对钢轨变形产生不利影响;钢轨横向变形随着日温升降呈现周期性的变化,日波动量最大为0.25 mm;钢轨横向变形随着时间的推移呈累积增加之势,测试期间累积变形量为0.5~2 mm左右,累积速率为-0.016 32~+0.004 32 mm/d;左右2股钢轨均呈现波长为4倍扣件间距的"碎弯",最大波幅为2 mm,最大轨距偏差为1.3 mm。研究成果对于进一步揭示钢轨横向变形机理、提高无砟轨道平顺性、保证行车安全和舒适具有指导意义。
In recent years, according to on-site observation, it is found that CWR in ballastless track will produce lateral deformation in sporadic bending form. For high speed railway, it is easy to stimulate hunting motion of locomotive and rolling stock and has a great impact on driving stability, comfort and safety. The transition between bridge and tunnel in Hefei-Fuzhou high-speed railway was taken as the object of study, the rail temperature and its lateral deformation were tested and analyzed continuously for a long term, and the results shows: There is a temperature difference of over 20 ℃ in the range of no more than 10 m of the rails, which will have influence on rail deformation; The lateral deformation of rail changes periodically with the increase and decrease of day temperature, the maximum of daily fluctuations is 0.25 mm; The lateral deformation of the rail shows a cumulative increase over time, the cumulative deformation is 0.5~2 mm or so and the cumulative rate is-0.016 32~+0.004 32 mm/d; Both of the left and right rails take on sporadic bending wavelength of 4 times than the fastener spacing and there exists maximum amplitude of 2 mm and gauge irregularity of-1.0 mm~+1.3 mm. Research findings attach guiding significance to revealing the mechanism of lateral deformation of rail, improving the ride comfort of ballastless track and ensuring the stability of the ballastless track lines, as well as safety and comfort of driving.
In recent years, according to on-site observation, it is found that CWR in ballastless track will produce lateral deformation in sporadic bending form. For high speed railway, it is easy to stimulate hunting motion of locomotive and rolling stock and has a great impact on driving stability, comfort and safety. The transition between bridge and tunnel in Hefei-Fuzhou high-speed railway was taken as the object of study, the rail temperature and its lateral deformation were tested and analyzed continuously for a long term, and the results shows: There is a temperature difference of over 20 ℃ in the range of no more than 10 m of the rails, which will have influence on rail deformation; The lateral deformation of rail changes periodically with the increase and decrease of day temperature, the maximum of daily fluctuations is 0.25 mm; The lateral deformation of the rail shows a cumulative increase over time, the cumulative deformation is 0.5~2 mm or so and the cumulative rate is-0.016 32~+0.004 32 mm/d; Both of the left and right rails take on sporadic bending wavelength of 4 times than the fastener spacing and there exists maximum amplitude of 2 mm and gauge irregularity of-1.0 mm~+1.3 mm. Research findings attach guiding significance to revealing the mechanism of lateral deformation of rail, improving the ride comfort of ballastless track and ensuring the stability of the ballastless track lines, as well as safety and comfort of driving.
引文
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[9]ZHAI Wanming,XIA He,CAI Chengbiao,et al.Highspeed train–track–bridge dynamic interactions-Part I:theoretical model and numerical simulation[J].International Journal of Rail Transportation,2013,1(1):3-24.
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[11]高亮.高速铁路无缝线路关键技术研究[M].北京:中国铁道出版社,2012.GAO Liang.Research on the key technology of high-speed railway CWR track[M].Beijing:China Railway Publishing House,2012.
[12]肖杰灵,郭利康,刘学毅.无砟轨道钢轨碎弯成因分析[J].铁道建筑,2009,93(2):93-96.XIAO Jielin,GUO Likang,LIU Xueyi.Research on causes of sporadic bending of rail on the ballastless track[J].Railway Engineering,2009,93(2):93-96.
[2]万章博,杨荣山,任勃,等.太阳辐射对CRTSⅠ型双块式无砟轨道道床板表面温度影响的试验研究[J].铁道科学与工程学报,2015,12(1):1-6.WAN Zhangbo,YANG Rongshan,REN Bo,et al.Experimental study on the impact of solar radiation intensity on the surface temperature of deck slab for CRTS I twin-block ballastless track[J].Journal of Railway Science and Engineering,2015,12(1):1-6.
[3]吴斌,朱坤腾,曾志平,等.列车荷载作用下CRTSⅢ型板式无砟轨道力学特性试验研究[J].铁道科学与工程学报,2016,13(7):1-6.WU Bin,ZHU Kunteng,ZENG Zhiping,et al.Experimental study on the mechanical characteristics of CRTSⅢslab ballastless track under train load[J].Journal of Railway Science and Engineering,2016,13(7):1-6.
[4]XIN Tao,GAO Liang.Reducing slab track vibration into bridge using elastic materials in high speed railway[J].Journal of Sound and Vibration,2011,11(23):2237-2248.
[5]刘勇.无砟轨道无缝线路钢轨横向变形模型试验研究[D].成都:西南交通大学,2015.LIU Yong.Model test of CWR lateral deformation of ballastless track[D].Chengdu:Southwest Jiaotong University Press,2015.
[6]田春香.桥梁横向伸缩对无砟轨道的变形影响研究[J].铁道工程学报,2015,32(3):25-30.TIAN Chunxiang.Research on influence of lateral expansion of bridge on the deformation of the ballastless track[J].Journal of Railway Engineering Society,2015,32(3):25-30.
[7]罗华朋,马旭峰,王平,等.初始不平顺与初始弯曲的叠加方式对无缝线路稳定性的影响[J].铁道标准设计,2015,59(7):40-44.LUO Huapeng,MA Xufeng,WANG Ping,et al.Effects of initial irregularity and initial bending stacking on the stability of continuous welded rail[J].Railway Standard Design,2015,59(7):40-44.
[8]YU Zhiwu,MAO Jianfeng,GUO Fengqi,et al.Nonstationary random vibration analysis of a 3D train-bridge system using the probability density evolution method[J].Journal of Sound and Vibration,2016,366(3):173-189.
[9]ZHAI Wanming,XIA He,CAI Chengbiao,et al.Highspeed train–track–bridge dynamic interactions-Part I:theoretical model and numerical simulation[J].International Journal of Rail Transportation,2013,1(1):3-24.
[10]MAO Jianfeng,YU Zhiwu,XIAO Yuanjie,et al.Random dynamic analysis of a train-bridge coupled system involving random system parameters based on probability density evolution method[J].Probability Engineering Mechanics,2016,46(10):48-61.
[11]高亮.高速铁路无缝线路关键技术研究[M].北京:中国铁道出版社,2012.GAO Liang.Research on the key technology of high-speed railway CWR track[M].Beijing:China Railway Publishing House,2012.
[12]肖杰灵,郭利康,刘学毅.无砟轨道钢轨碎弯成因分析[J].铁道建筑,2009,93(2):93-96.XIAO Jielin,GUO Likang,LIU Xueyi.Research on causes of sporadic bending of rail on the ballastless track[J].Railway Engineering,2009,93(2):93-96.
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