地铁线路U型槽区段轨道设置钢支墩的维修方案及其力学特性研究
张娅敏
Study on Maintenance Plan and Mechanical Characteristics of Steel Abutment Setting for Metro Line U-shaped Groove Section Track
ZHANG Yamin
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作者信息:1.1. 中铁第四勘察设计院集团有限公司，430063，武汉；
2.2. 铁路轨道安全服役湖北省重点实验室，430063，武汉
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Affiliation:China Railway Siyuan Survey and Design Group Co., Ltd., 430063, Wuhan, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2022.09.015
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中图分类号/CLCN:U231.2
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栏目/Col:研究报告
摘要:
在地铁实际运营中，由于列车荷载长期作用等因素，导致U型槽截水沟处的整体道床出现垂向分层及水平位移现象，进而影响列车正常运营。针对此病害，提出设置钢支墩结构的临时支承维修方案，以保证在道床整治更换期间列车的正常运行。为验证所提维修方案的可行性，通过建立有限元模型对列车静荷载和动荷载作用下，钢支墩受力变形情况和轨道结构动力响应结果进行分析，同时对施工流程提出建议。研究结果表明：在最不利荷载作用下，钢支墩结构最大应力为82.10 MPa，最大垂向位移为0.16 mm，满足正常使用要求；当列车运行速度分别为80 km/h和25 km/h时，钢支墩等效应力最大值分别为23.24 MPa和23.22 MPa，混凝土底座的主应力最大值分别为0.68 MPa和0.47 MPa，均满足使用要求。所提维修方案施工作业过程简单，在减少维修期间对既有线路条件及轨道设备干扰的同时，保障了列车的正常运营。
Abstracts:
In the actual operation of metro, because of factors such as long-term action of train load, vertical stratification and horizontal displacement of the whole track bed appear at the U-shaped groove cut-off ditch, which affects the normal operation of the train. In response to this disease, a temporary support maintenance plan of setting steel abutment structure is proposed to ensure the normal operation of the train during renovation and replacement of track bed. To verify the feasibility of the proposed maintenance plan, a finite element model of train under static and dynamic loading is established, and the result of steel abutment stress deformation and track structure dynamic response is analyzed. Meanwhile, suggestions are put forward for the construction process. Research results show that: under the most adverse load action, the maximum stress of steel abutment structure is 82.10 MPa, and the maximum vertical displacement is 0.16 mm, which meets the requirements of normal use. When the train running speeds are 80 km/h and 25 km/h, the maximum equivalent stress of the steel abutment are 23.24 MPa and 23.22 MPa respectively, and the maximum principal stress of the concrete base are 0.68 MPa and 0.47 MPa, both of which meet the requirements of use. Therefore, the proposed maintenance plan is simple in construction process, reducing the interference to existing line conditions and track equipment during maintenance while ensuring normal operation of the train.
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