有轨电车线路扣件埋入式轨道衔接路面受力仿真分析
雷震宇赵阳李莉耿传智
Stress Simulation Analysis of the Pavement-Track Joint with Embedded Fasteners ofTram Line
LEI ZhenyuZHAO YangLl LiGENG Chuanzhi
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作者信息:同济大学铁道与城市轨道交通研究院
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Affiliation:Institute of railway and urban rail transit, Tongji University
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2022.04.006
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中图分类号/CLCN:U482.1
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栏目/Col:学术专论
摘要:
目前在已经开通运营的有轨电车扣件埋入式轨道线路道口段，轨旁沥青路面经过车辆反复碾压破坏较为严重。通过有限元软件ABAQUS构建轨道-路面衔接部分的有限元模型，研究社会车辆荷载作用下轨旁沥青路面响应特性，并对扣件罩和轨腰护块进行设计优化。根据仿真计算结果可知：最不利工况下，沥青层最大变形出现在沥青上面层，为0.423 4 mm,最大应力出现在下面层，为0.971 6 MPa。随着扣件罩或轨腰护块弹性模量的提高，沥青路面的应力和变形呈现线性减小的趋势，其中下面层沥青的应力和变形下降幅度比上面层大；提高到约原弹性模量的2.5倍时，沥青层竖向变形最大降幅分别为3.34%、8.27%,最大应力降幅分别为2.41%、7.55%;扣件罩和轨腰护块最大应力增幅较大，分别达到45.69%、140.61%。故在提高部件弹性模量来改善轨旁沥青路面响应性能的同时还应该考虑在高应力状态下部件的工作性能。
Abstracts:
At present, for the track sections with embedded fasteners of operating trams, the asphalt pavement along the rail is seriously damaged after being repeatedly rolled over by vehicles. Through finite element software ABAQUS, the finite element model of railpavement joint section is constructed, to study the response characteristics of trackside asphalt pavement under social vehicle load and to optimize design of fastener covers and rail side protection blocks. According to the calculation results, under the most unfavorable working condition, the maximum deformation occurs in the top layer of asphalt, which is 0.423 4 mm, and the maximum stress occurs in bottom layer, which is 0.971 6 MPa. With the increase of elastic modulus of fastener covers or rail side protection blocks, the stress and deformation of asphalt pavement shows tendency of linear decrease, of which the decrease range of stress and deformation of bottom asphalt layer is larger than that of the top layer. When the elastic modulus is increased to about 2.5 times of the original one, the maximum vertical deformation reduction of asphalt layer is 3.34% and 8.27% respectively, and the maximum stress reduction range is 2.41% and 7.55% respectively. The maximum stress of fastener covers and rail side protection blocks has increased greatly, reaching 45.69% and 140.61% respectively. Therefore, while the response performance of trackside asphalt pavement is improved by increasing the elastic modulus of components, the performance of components under high stress should also be considered.
引文 / Ref:
雷震宇, 赵阳, 李莉. 有轨电车线路扣件埋入式轨道衔接路面受力仿真分析. 城市轨道交通研究, 2022,25(4): 27.
LEI Zhenyu, ZHAO Yang, Ll Li. Stress simulation analysis of the pavement-track joint with embedded fasteners of tram line. Urban Mass Transit, 2022, 25(4): 27.
LEI Zhenyu, ZHAO Yang, Ll Li. Stress simulation analysis of the pavement-track joint with embedded fasteners of tram line. Urban Mass Transit, 2022, 25(4): 27.
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