复杂艰险山区铁路桥隧相连区域轨道结构温度适应性研究  

Study on Temperature Adaptability of Track Structure in Railway Bridge-tunnel Transition Area in Complex and Difficult Mountainous Areas

作　　者：侯博文[1,2] 赵闻强 高亮 蔡小培[1] 郄录朝[4] 徐旸 HOU Bowen;ZHAO Wenqiang;GAO Liang;CAI Xiaopei;QIE Luchao;XU Yang(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Beijing Rail Transit Line Engineering Safety and Disaster Prevention Engineering Technology Research Center,Beijing 100044,China;Intelligent Transportation Research Branch of Zhejiang Communications Investment Group Co.,Ltd.,Hangzhou 310030,China;Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]北京市轨道交通线路工程安全与防灾工程技术研究中心,北京100044 [3]浙江省交通投资集团有限公司智慧交通研究分公司,浙江杭州310030 [4]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081

出　　处：《铁道学报》2022年第5期119-126,共8页Journal of the China Railway Society

基　　金：中国铁路总公司科技研究开发计划(P2018G047);北京市轨道交通线路工程安全与防灾工程技术研究中心开放研究基金(RRC201802);高速铁路轨道技术国家重点实验室开放基金(2021YJ051)。

摘　　要：复杂艰险山区铁路严苛的服役环境给桥隧相连区域轨道选型提出了新的挑战。在明确复杂艰险山区铁路桥隧相连区轨道服役要求的基础上,建立艰险山区桥隧相连区轨道-下部基础空间精细化分析模型,并同时考虑了隧道内外的温度荷载特征,分析不同轨道结构在桥隧相连区域的温度适应性,提出相应的选型建议。计算结果表明:隧道口存在的纵向温度梯度荷载使得钢轨纵向位移峰值出现在温度过渡区内;桥上铺设无砟轨道后,受多层混凝土结构体系的变形协调关系影响,线路中存在中短波长的不均匀垂向变形,且道床板与底座间可能存在离缝,最大离缝量可达1.6 mm,对线路平顺性造成影响;桥上铺设有砟轨道后,有效减小了钢轨的温度应力,线路整体变形分布更为均匀。结合复杂艰险山区地区可能存在的大跨悬索桥、大跨钢桁拱桥等特殊桥梁结构,建议在艰险山区桥隧相连区域桥上铺设有砟轨道。The harsh service environment of railway in complex and difficult mountainous areas poses a new challenge to the design of tracks in bridge-tunnel transition area.Based on the analysis of service requirements of the track in the bridge-tunnel transition area of the complex and difficult mountainous area,a track-foundation spatial refined model for the bridge-tunnel transition area was built in this paper.At the same time,considering the temperature load characteristics inside and outside the tunnel,the temperature adaptability of different track structures in the bridge-tunnel transition area was analyzed,and suggestions on structure selection were put forward.The results show that:due to the longitudinal temperature gradient load at the tunnel port,the peak value of longitudinal displacement of rail appears in the temperature transition zone.After ballastless track being laid on the bridge,the deformation coordination relationship of the multi-layer concrete structure system causes uneven vertical short-medium wavelength deformations of the structures.There may be a contact loss area between the slab and the base.The maximum vertical separation distance of 1.6mm will affect the regularity of the rail line.The ballast track on the bridge effectively reduces the temperature stress of the rail,resulting in more uniform overall deformation of the structures.Considering the special bridge structures such as long-span suspension bridge and long-span steel truss arch bridge in complex and difficult mountainous areas,the ballast track is more recommended on the bridge of bridge-tunnel transition area in complex and difficult mountainous areas.

关 键 词：复杂艰险山区铁路 无砟轨道 有砟轨道 桥隧相连区域 无缝线路 

分 类 号：U213.2[交通运输工程—道路与铁道工程] U213.3