【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/s2，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。更多还原

【Abstract】 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 CRTS Ⅲ slab 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]με and[20,30]με respectively,while the longitudinal ones are within[5,15]με and[15,25]με respectively;the ultimate surface tensile and compressive strains of the self-compacting concrete layer are within[5,15]με and[15,30]με respectively.(2)The maximum displacement of the functional component is 0.15 mm,and the maximum acceleration is approximately 0.23 m/s2,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.更多还原