新型板式高速磁浮轨道疲劳试验研究  

Fatigue Test of New Type Plate High-speed Maglev Track

作　　者：陈嵘[1,2] 王巍钦 陈治朱 朱翔宇[1,2] 徐舟[1,2] 蔡文锋[3] 刘凯[1,2] CHEN Rong;WANG Weiqin;CHEN Zhizhu;ZHU Xiangyu;XU Zhou;CAI Wenfeng;LIU Kai(MOE Key Laboratory of High-speed Railway Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China;Southwest Jiaotong University,Chengdu,Sichuan 610031,China;China Railway Eryuan Engineering Group Co.Ltd,Chengdu,Sichuan 610031,China)

机构地区：[1]西南交通大学高速铁路线路工程教育部重点实验室,成都610031 [2]西南交通大学,成都610031 [3]中铁二院工程集团有限责任公司,成都610031

出　　处：《铁道工程学报》2025年第1期20-25,共6页Journal of Railway Engineering Society

基　　金：中国中铁股份有限公司科技计划项目(2021-重大-16);中铁二院科技计划项目(KSNQ213004)。

摘　　要：研究目的:高速磁浮轨道在长期运营时受列车、环境等荷载影响,会产生桥梁变形和地基沉降等问题,轨道平顺性降低,同时高速磁浮轨道结构几何形位难以调整且维修不便,致使列车运营安全性降低。本研究借鉴无砟轨道CRTSⅢ型板式结构,设置自密实混凝土层作为调整层,制作单元轨道结构试件并开展300万次列车荷载疲劳试验,研究结构应变变化与功能件位移、加速度变化。研究结论:(1)随着加载次数增加,轨道板横向、纵向应变和调整层表面应变均先剧烈变化后趋于稳定,轨道板横向应变拉、压应变最终稳定在[15,30]με、[20,30]με,纵向应变拉、压应变最终稳定在[5,15]με、[15,25]με;混凝土自密实层表面应变拉、压应变最终稳定在[5,15]με、[15,30]με;(2)功能件位移最值0.15 mm,加速度最值约0.23 m/s^(2),存在较大安全余量;(3)300万次疲劳荷载作用下轨道结构应变水平稳定,无结构破坏现象,新型板式高速磁浮轨道能较好适应列车荷载;(4)本研究可为高速磁浮轨道梁结构优化设计提供参考。Research purposes:During long-term operation,high-speed maglev tracks,influenced by train-related loads and environment-related loads,may encounter problems such as bridge deformation and foundation settlement,which leads to a decline in track smoothness.Moreover,the geometric position of the high-speed maglev track structure is hard to adjust and inconvenient to maintain,thus reducing train operation safety.In this study,inspired by the ballastless track CRTSⅢslab structure,a self-compacting concrete layer is set as an adjustment layer.Unit track structure specimens are fabricated and 3 million cycle train-load fatigue tests are conducted to investigate the structural strain changes and the displacement and acceleration changes of functional components.Research conclusions:(1)With the increase in loading cycles,the transverse and longitudinal strains of the track slab and the surface strain of the adjustment layer initially experience significant fluctuations before reaching a stable state.The ultimate transverse tensile and compressive strains of the track slab stabilize within the ranges of[15,30]μεand[20,30]μεrespectively,while the longitudinal ones are within[5,15]μεand[15,25]μεrespectively;the ultimate surface tensile and compressive strains of the self-compacting concrete layer are within[5,15]μεand[15,30]μεrespectively.(2)The maximum displacement of the functional component is 0.15 mm,and the maximum acceleration is approximately 0.23 m/s^(2),suggesting a substantial safety margin.(3)Under 3 million cycle fatigue loading,the track structure exhibits a stable strain level without any signs of structural failure,indicating that the new type of plate high-speed maglev track can better adapt to train loads.(4)This study can provide a reference for the optimal design of high-speed maglev track beam structures.

关 键 词：高速磁浮 轨道梁 疲劳试验 疲劳性能 

分 类 号：U237[交通运输工程—道路与铁道工程]