无砟轨道无缝线路钢轨碎弯影响因素分析  

Analysis on Influencing Factors of Rail Continuous Bending of Ballastless Track Continuous Welded Rail

作　　者：展旭和 张涛 金泰木 罗俊 王开云[2] ZHAN Xuhe;ZHANG Tao;JIN Taimu;LUO Jun;WANG Kaiyun(National Innovation Center of High Speed Train,Qingdao Shandong 266111,China;State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]国家高速列车青岛技术创新中心,山东青岛266111 [2]西南交通大学牵引动力国家重点实验室,成都610031

出　　处：《铁道建筑》2021年第8期106-109,113,共5页Railway Engineering

基　　金：国家自然科学基金(51735012,11790283);国家自然科学基金高速铁路基础研究联合基金(U1334203)。

摘　　要：在轨条纵向力、钢轨初始弯曲和线路横向抗力作用下,无砟轨道无缝线路钢轨可能以碎弯形式产生一定的横向变形,危害行车安全。本文通过建立CRTSⅠ型双块式无砟轨道无缝线路有限元模型,考虑等效升温幅值引起的钢轨纵向力,分析了钢轨碎弯影响因素及作用规律。结果表明:不同初始弯曲线形均存在最不利波长,复曲线形初始弯曲容易使钢轨产生更大的横向变形;正弦曲线形初始弯曲的横向位移幅值会随着初始弯曲半波数的增加而增大;养护维修过程中在防止扣件扣压力损失过多的同时,还应避免横向刚度不均匀分布造成轨道几何形位超限。Under the action of longitudinal force of rail,initial bending of rail and lateral resistance of railway track,the rail of ballastless track Continuous Welded Rail(CWR)may produce certain lateral deformation in the form of rail continuous bending,which endangers train safety.In this paper,by establishing the finite element model of CRTS I double block ballastless track CWR and considering the longitudinal force of rail caused by equivalent heating amplitude,the influencing factors and action law of rail continuous bending were analyzed.The results show that the most unfavorable wavelength exists in different initial bending curves,and the initial bending of compound curve is easy to cause greater lateral deformation of rail.The lateral displacement amplitude of sinusoidal initial bending increases with the increase of initial bending half wave number.During track maintenance,besides preventing excessive loss of fastening force,it is also necessary to avoid exceeding the limit of track geometry caused by uneven distribution of lateral stiffness.

关 键 词：高速铁路 无砟轨道 钢轨碎弯 数值模拟 初始弯曲 扣件横向刚度 横向变形 

分 类 号：U213.2[交通运输工程—道路与铁道工程]