制动力作用下桥上道岔区纵连无砟轨道受力与位移  

Braking Forces and Displacements of Longitudinally Counpled Ballastless Welded Turnout on Bridges

作　　者：任娟娟[1] 王平[1] 刘学毅[1] 刘佳[2] 

机构地区：[1]西南交通大学高速铁路线路工程教育部重点实验室,四川成都610031 [2]慕尼黑工业大学交通运输研究所,慕尼黑d81245

出　　处：《西南交通大学学报》2011年第1期49-55,共7页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金资助项目(51078320);高等学校博士学科点专项科研基金资助项目(20100184120021);中央高校基本科研业务费专项资金资助项目(SWJTU09BR014);中央高校基本科研业务费科技创新项目(SWJTU09CX003)

摘　　要：为系统分析纵连无砟轨道与桥上无缝道岔在制动力作用下的受力与变形规律,以武汉—广州客运专线雷大桥铺设博格纵连式无砟道岔为例,将客专18号渡线、纵连式无砟轨道、桥梁和墩台视为整体,建立了岔-板-梁-墩一体化计算模型,分析制动力作用下道岔、道床板、桥墩的受力和变形规律.分析结果表明:在制动力作用下,基本轨制动附加力及位移随道床板伸缩刚度的减小而增大,但板轨相对位移未超过1 mm;限位器和间隔铁的纵向力及心轨、尖轨处板轨相对位移受无砟轨道结构的影响较小,限位器未贴靠,间隔铁力最大未超过13 kN;道床板制动附加力随伸缩刚度的降低而减小,减小量最大达到3 832.9 kN,位移则增大,最多达到17.4 mm;道床板伸缩刚度和滑动层摩擦因数减小对桥墩受力不利;当滑动层摩擦因数μ≤0.2时,取消固结机构,桥墩纵向力减小值接近500 kN.A finite element model of turnout-track slab-bridge beam-pier was established to analyze the forces exerted on ballastless track and welded turnout on bridge and their displacements under braking forces,in which a single crossover（composed of 2 sets of No.18 welded turnouts）,the longitudinally coupled ballastless track,the bridge beam and the pier are regarded as one system.The welded turnout of longitudinally coupled ballastless track on Leida bridge on Wuhan-Guangzhou high speed passenger line was taken as an example.Calculation results show that braking forces on and displacement of the stock rail increase with a decrease in the slab stiffness,and the displacement between the slab and the rail is less than 1 mm.The structure of the ballastless track has a little effect on the longitudinal forces exerted on the position-limited devices and spacers,and the displacements of nose rail and switch rail.Braking forces do not result in contact between the two blocks of the position-limited device,and the forces exerted on them are less than 13 kN.A decrease in slab stiffness reduces the forces exerted on it,with a maximum value of 3 832.9 kN,and increases its displacement,with a maximum value of 17.4 mm.Decreasing slab stiffness and friction coefficient of slip layers increases the forces exerted on the piers,and when the friction coefficient is less than 0.2,the longitudinal forces exerted on the piers decreases by about 500 kN.

关 键 词：桥上无缝道岔 纵连式无砟轨道 制动附加力 纵向位移 

分 类 号：U213.6[交通运输工程—道路与铁道工程]