铁道标准设计2024，Vol.68Issue(6)：51-57,7.DOI:10.13238/j.issn.1004-2954.202210160002
有轨电车嵌入式轨道路基不均匀沉降限值研究
Study on the Threshold Value of Uneven Settlement of Subgrade under Embedded Rail Track of Tram
摘要
Abstract
In order to determine the specific threshold value of uneven settlement of subgrade under embedded rail track of tram,a coupled dynamic model of tram-embedded rail track-subgrade considering uneven settlement of subgrade is proposed according to the multi-rigid body dynamics and finite element method.The influence of subgrade settlement amplitude and wavelength on the geometry of embedded rail track under self weight load is investigated in detail.And the subgrade settlement wavelength that is sensitive to the dynamic responses of tram vehicle and track structure is identified.Then the threshold value of uneven settlement of subgrade is obtained on the basis of the fatigue life of track slab.The results show that,under the action of self-weight load,the following deformation curve of rail in the area of uneven settlement of cosine subgrade also presents cosine-like shape,which is basically the same as that of ballastless track supported by ordinary fasteners.Secondly,with the increase of the settlement wavelength,the vertical acceleration of the car body and the dynamic responses of the embedded rail track show a trend of first increasing and then decreasing.When the subgrade settlement wavelength is 10 m,the vertical acceleration of the car body,the dynamic displacement of the rail,the dynamic displacement of the track slab and the bending stress of the track slab all get the maximum value,which indicates that the sensitive subgrade settlement wavelength is 10 m.Finally,in order to ensure the 60-year service life of the embedded rail track of tram,it is recommended to strictly control the differential settlement of subgrade with wavelength below 10m,and the corresponding settlement amplitude of differential settlement of subgrade with wavelength of 20m shall not be greater than 24 mm.关键词
有轨电车/嵌入式轨道/路基不均匀沉降/轨道几何形态/疲劳寿命Key words
tram/embedded rail track/subgrade uneven settlement/track geometry/fatigue life分类
交通工程引用本文复制引用
孙魁,农兴中,肖军华,冯青松,翟利华..有轨电车嵌入式轨道路基不均匀沉降限值研究[J].铁道标准设计,2024,68(6):51-57,7.基金项目
国家自然科学基金项目(51878277) （51878277）
广东省城市轨道交通工程建造新技术企业重点实验室课题(51678447) （51678447）
