地裂缝环境下地铁列车高低调整型板式无砟轨道竖向振动特性分析
康孝利
Vertical Vibration Characteristic Analysis of Subway Train Height-Adjustable Slab Ballastless Track in Ground Fissure Environment
KANG Xiaoli
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作者信息:陕西红柠铁路有限责任公司， 719300， 榆林
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Affiliation:Shaanxi Hongning Railway Co., Ltd., 719300, Yulin, China
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关键词:
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Key words:
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DOI:10.16037/j.1007－869x.20245127
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中图分类号/CLCN:U231
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栏目/Col:土建工程
摘要:
［目的］受地裂缝上盘预留联络线等工程条件限制，既有无砟轨道结构无法满足地裂缝大变形条件下地铁轨道结构高低调整功能，为此，需要一种高低调整型板式无砟轨道结构。［方法］考虑地裂缝区域轨道结构的特点，将可调支座与框架板结合，提出了一种支座高低调整型板式无砟轨道结构，并基于有限单元法建立列车-轨道系统竖向振动分析模型，探讨地裂缝条件下无砟轨道结构的力学特性和环境适应性。［结果及结论］高低调整型板式无砟轨道调高能力达300 mm，可确保地裂缝大变形条件下轨道的平顺性；钢轨最大竖向位移等典型动力指标满足相关规范要求，高低调整型板式无砟轨道的功能可靠；日常养护维修应着重关注支座结合处状态，板中支座离缝不应大于0.15 mm，板端支座避免形成离缝。
Abstracts:
［Objective］ Limited by engineering conditions such as the reserved connecting line on the hanging wall of the ground fissure, the existing ballastless track structure cannot meet the height adjustment function of subway track structure under large ground fissure deformation condition. Therefore, a height-adjustable slab ballastless track is needed. ［Method］ Considering the track structure characteristics in the ground fissure area, combining adjustable support with the frame plate, a slab ballastless track structure with height-adjustable support is proposed. A vertical vibration analysis model of the train-track system is established based on the finite element method, to discuss the mechanical properties and environmental adaptability of the ballastless track structure under ground fissure conditions. ［Result & Conclusion］ The height-adjustable slab ballastless track is capable of adjusting up to 300 mm, ensuring the track smoothness under large ground fissure deformation condition; typical dynamic indicators such as the rail maximum vertical displacement meet the requirements of relevant specifications, verifying the reliable functions of the height-adjustable slab ballastless track; it is noticed that the daily maintenance and repair should focus on the state of the support joint, the seam in the middle slab supports should not be greater than 0.15 mm, so as to avoid the seams forming at the slab end supports.
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