环境因素引发的CRTS Ⅲ型无砟轨道板温度场和竖向变形特征分析
杨东晓1吴尚2周俊召2
Analysis of Temperature Field and Vertical Deformation Characteristics of CRTS Ⅲ Ballastless Track Slab Caused by Environmental Factors
YANG DongxiaoWU ShangZHOU Junzhao
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作者信息:1.中国铁路上海局集团有限公司徐州工务段，221005，徐州；
2.同济大学铁道与城市轨道交通研究院, 201804，上海
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Affiliation:1.Xuzhou Track Maintenance Subdivision, China;
2.Railway Shanghai Bureau Group Co., Ltd., 221005, Xuzhou, China
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关键词:
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DOI:10.16037/j.1007-869x.2021.06.003
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中图分类号/CLCN:U213.2+44
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栏目/Col:研究报告
摘要:
针对轨道交通CRTS Ⅲ无砟轨道板在环境因素作用下产生的翘曲变形，在实际运营线路上采用传感器对其温度和竖向变形进行现场测试，分析在不同的环境条件下轨道板的变形规律以及轨道板变形后对列车运行的平稳性和舒适性的影响。研究发现：板内温度梯度是CRTS Ⅲ型轨道板产生翘曲变形的主要影响因素，在夏季晴天，轨道板在太阳辐射和环境温度共同作用下，白天时轨道板变形呈现上凸变形，夜晚时轨道板变形呈现下凹变形，且上凸变形幅度大于下凹变形；阴雨天气由于太阳辐射程度减小，轨道板变形相对较小；在不同的环境条件下的轨道板变形中，轨道板边缘处的竖向变形要大于其他部位；轨道板变形会对钢轨的不平顺产生影响，但其变形量对列车的平稳性和舒适度影响不大，且在极端工况下，列车的平稳性指标和舒适性指标均为优。
Abstracts:
In view of the warping deformation of CRTS Ⅲ ballastless track slab of rail transit under the action of environmental factors, the temperature and vertical deformation taking place on actual operation line are observed and tested on site by sensors. The deformation patterns of the track slab under different environmental conditions and the influence of the track slab deformation on stability and comfort of train operation are studied. It is found that the temperature gradient is the main factor affecting the warpage of CRTS Ⅲ track slab. On a sunny Summer day, under combined action of solar radiation and ambient temperature, the deformation of track slab in daytime presents "upward convex", while it is "concave" at night, and the deformation amplitude of convex deformation is larger than that of concave deformation. Due to the reduction of solar radiation, the deformation of track slab is relatively small in rainy weather. The vertical deformation at the edge of track slab is larger than that of other parts in different environmental conditions. Through calculation, it is found that track slab deformation will affect irregularity of the rail, however the deformation value has little effect on stability and comfort of the train. Under extreme working conditions, stability and comfort indicators of the train are both excellent.Key wordsrail transit; ballastless track slab; temperature field; vertical deformation characteristics; environmental factors
引文 / Ref:
杨东晓，吴尚，周俊召.环境因素引发的CRTS Ⅲ型无砟轨道板温度场和竖向变形特征分析[J].城市轨道交通研究，2021，24（6）：10.
YANG Dongxiao，WU Shang，ZHOU Junzhao.Analysis of Temperature Field and Vertical Deformation Characteristics of CRTS Ⅲ Ballastless Track Slab Caused by Environmental Factors[J].Urban mass transit，2021，24（6）：10.
YANG Dongxiao，WU Shang，ZHOU Junzhao.Analysis of Temperature Field and Vertical Deformation Characteristics of CRTS Ⅲ Ballastless Track Slab Caused by Environmental Factors[J].Urban mass transit，2021，24（6）：10.
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