首页|高铁大跨度斜拉桥上无砟轨道变形适应性理论与试验研究

高铁大跨度斜拉桥上无砟轨道变形适应性理论与试验研究

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高速铁路大跨度斜拉桥应用无砟轨道可提高线路平顺性和稳定性,消除线路的潜在限速点,统一轨道类型,减少轨道线路运维成本,是我国高速铁路的重要技术创新.依托世界首座无砟轨道大跨度斜拉桥-昌吉赣客专赣州赣江特大桥,建立大跨度斜拉桥-无砟轨道体系精细化有限元分析模型,探明了大跨度斜拉桥-无砟轨道一体化体系的变形特征,设计并制作了大跨度斜拉桥上无砟轨道变形适应性的等效比例室内试验模型,开展了大跨度斜拉桥上无砟轨道变形适应性理论与试验研究,对比分析了大跨度桥上无砟轨道的不同长度、隔离层类型及布置方式的影响,研究了在各类变形条件下大跨度斜拉桥上无砟轨道的变形跟随性和协调性.研究结果表明:大跨度斜拉桥梁端转角和主梁整体挠曲变形仍可依据现行规范中的中小桥梁相关限值进行控制;应合理控制斜拉桥主梁节间的局部变形,避免桥上无砟轨道层间出现脱空离缝;提出了大跨度斜拉桥上单元式无砟轨道设置橡胶隔离层的技术方案,论证了橡胶隔离层的应用效果,建立了桥上无砟轨道橡胶隔离层的"缓冲作用"理念和轨道层间"隔而不离"的设计目标,显著提高了桥上无砟轨道的变形适应性;本文研究成果可为高速铁路大跨度斜拉桥上无砟轨道的推广应用提供技术支持.
Theoretical and experimental research on deformation adaptability of ballastless tracks on long-span cable-stayed bridge in high-speed railway
The application of ballastless track on long-span cable-stayed bridge of high-speed railway can improve the railway smoothness and stability,eliminate potential railway speed restrictions,unify track types,and reduce the maintenance cost of the track,which is an important technological innovation of high-speed railway in China.In this work,based on the first long-span cable-stayed bridge with ballastless track named Ganzhou Ganjiang bridge in Chang-Ji-Gan passenger dedicated line,the refined finite element model of long-span cable-stayed bridge with ballastless track was established,the deformation characteristics of the long-span cable-stayed bridge with ballastless track system were explored,the equivalent scale test model of long-span cable-stayed bridge with ballastless track was designed and produced,and the theoretical and experimental deformation adaptability research of long-span cable-stayed bridge with ballastless track was carried out.Therefore,the effects of different lengths,types of isolation layers and arrangements of ballastless track on long-span cable-stayed bridge were analyzed,and the deformation followability and coordination of ballastless track on long-span cable-stayed bridge under various deformation conditions were studied.The main conclusions are as follows:the beam end rotation and the overall deflection of the main girder can be controlled according to the relevant limits of small and medium-span bridges in current specifications in China,and the local deformation of the main girder should be reasonably controlled to avoid voids between the ballastless track and long-span bridge;The technical scheme of the unit ballastless track with rubber isolation layer laid on the long-span cable-stayed bridge is proposed,and the buffer effect of the rubber isolation layer in ballastless track and the design goal of"separation without separation"at ballastless track interlayer is put forward,so as to significantly improve the deformation adaptability of the ballastless track laid on long-span cable-stayed bridge.Therefore,this work provides a valuable technical support for the application of ballastless tracks on the long-span cable-stayed bridge in high-speed railway.

high-speed railwaylong-span cable-stayed bridgeballastless tracksisolation layerdeformation adaptabilityexperimental research

郑纬奇、朱志辉、盛兴旺、李的平、郭舜哲

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中南大学 土木工程学院,湖南 长沙 410075

高速铁路建造技术国家工程研究中心,湖南 长沙 410075

中铁第四勘察设计院集团有限公司,湖北 武汉 430063

高速铁路 大跨度斜拉桥 无砟轨道 隔离层 变形适应性 试验研究

国家自然科学基金湖南省自然科学基金湖南省教育厅科研项目国家铁路集团有限公司科技研发计划

520784882022JJ4062821A0010L2021G007

2024

10.19713/j.cnki.43-1423/u.T20230860

铁道科学与工程学报
中南大学 中国铁道学会

铁道科学与工程学报

CSTPCD北大核心EI
影响因子：0.837
ISSN：1672-7029
年,卷(期)：2024.21(4)
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