摘要
研究目的:本文以某山地米轨铁路为例,研究坡度250‰以上有砟轨道结构的稳定性和极限坡度。首先进行米轨混凝土枕的道床阻力测试试验,并建立轨排结构有限元模型,分析坡度和扣件阻力对轨排结构稳定性的影响;接着建立米轨有砟轨道三维有限元模型,研究坡度与竖曲线半径对有砟道床稳定性的影响;最后,根据扣件阻力、道床阻力与大坡道有砟轨道稳定性的关系提出米轨有砟轨道极限坡度和竖曲线半径的建议值。研究结论:(1)通过试验测试,得到了道床阻力-位移关系,结果表明轨排结构的稳定性随坡度增大而减弱,在扣件阻力不大于10 k N/组时其极限坡度为500‰;(2)有砟道床的稳定性随着坡度的增大而逐渐减弱,在列车荷载作用下,有砟道床保持稳定的最大坡度为500‰;(3)变坡点凸形竖曲线附近道床稳定性弱于直坡道地段,且其稳定性随着竖曲线半径的增大而逐渐增强,在坡度为250‰的情况下,为了保持有砟道床稳定竖曲线半径不能小于400 m;(4)本文研究成果可为米轨铁路大坡道有砟轨道结构稳定性分析提供理论与试验依据。
Research purposes:Taking a meter-gage railway in a mountainous area as an example,this paper studied the stability of ballasted track over the slope of 250‰and the limit slope.Firstly,the meter-gage railway’s longitudinal resistance test of ballast bed was carried out,the finite element model of track pane was established and the influence of slope and fastener resistance on the stability of track panel was analyzed.Then the three-dimensional finite element model of ballasted track with meter-gage railway was established and the influence of slope and vertical curve radius on the stability of ballast bed was studied.Finally,this paper put forward suggested value of the limit slope and vertical curve radius according to the relationship between the fastener resistance,the ballast bed resistance and the stability of large-slope ballasted track.Research conclusions:(1)The relationship between resistance and displacement of ballast bed is obtained through test.Analysis result shows that the stability of the track panel decreases with the increase of slope.When the resistance of the fastener is no more than 10 kN/m,the limit slope reaches 500‰.(2)The stability of ballast bed gradually weakens with the increase of slope.Under the action of train load,the maximum slope of ballast to maintain stability is 500‰.(3)It is found that the stability of the ballast bed near the convex vertical curve is weaker than that of the straight slope section,and its stability gradually increases with the increase of the vertical curve radius.In order to maintain the stability of the ballast bed,the vertical curve radius cannot be less than 400 m when the slope is 250‰.(4)The research results can provide theoretical and experimental basis for the stability analysis of meter-gage railway ballasted track structure on large slope.
作者
李粮余
欧灵畅
尤睿
韦凯
王平
LI Liangyu;OU Lingchang;YOU Rui;WEI Kai;WANG Ping(China Railway Eryuan Engineering Group Co.Ltd,Chengdu,Sichuan 610031,China;MOE Key Laboratory of High-speed Railway Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China)
出处
《铁道工程学报》
EI
北大核心
2019年第12期23-28,共6页
Journal of Railway Engineering Society
基金
旅游铁路米轨轨道系统成套关键技术研究〔KYY2018097(18-19)〕
关键词
大坡道
轨排
纵向阻力
有砟道床
稳定性
等效塑性应变
large slope
track panel
longitudinal resistance
ballast bed
stability
equivalent plastic strain
