初拱变形对CRTSⅡ型轨道板上拱的影响研究  

Influence of Initial Up-warp Deformation on Up-warp of CRTSⅡ Track Slab

作　　者：陈醉 肖杰灵[1,2] 张雯皓[1,2] 李威[1,2] 刘学毅 CHEN Zui;XIAO Jie-ling;ZHANG Wen-hao;LI Wei;LIU Xue-yi(MOE Key Laboratory of High-speed Railway Engineering,Southwest Jiaotong University,Chengdu 610031,China;School ot＂ CMI Engineering,Southwest Jiaotong University,Chengdu 610031,China)

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,成都610031 [2]西南交通大学土木工程学院,成都610031

出　　处：《铁道标准设计》2018年第10期46-52,共7页Railway Standard Design

基　　金：国家自然科学基金重点项目(U1434208);国家自然科学基金(51278431);四川省科技计划项目(2016GZ0333)

摘　　要：通过不同初拱变形参数条件下CRTSⅡ型板式轨道垂向稳定性的分析,研究初拱变形对轨道结构高温稳定性的影响。基于能量变分原理,推导不等波长和波幅条件下轨道板的上拱矢度的计算公式,并与数值仿真结果进行比较;通过数值拟合的方法得出上拱弦长与板中整体温升、初拱矢度、初拱弦长的关系表达式,并用公式法分析不同初拱变形参数对轨道系统高温稳定的影响规律。结果表明:若初拱弦长小于1.5 m,幅值小于10℃的整体温升便能导致轨道板上拱;当轨道板底产生大面积脱空时,板体不易产生上拱位移;不同的温升存在着不同的最不利弦长与矢度,轨道板初始上拱弦长为5~6 m时,最不易保持2 mm的上拱位移临界值。Through analysis of vertical stability of CRTSⅡ track slab with different parameters of initial up-warp deformation,effects of initial up-warp deformation on the stability of track structure at high temperature are studied. Based on the principle of energy variation,formula for degree of up-warp rise of track slab with variable chord length and variable degree of rise is deduced and compared with numerical simulation results. The relationship between the up-warp chord length and the temperature rise,degree of initial up-warp rise and chord length is obtained by numerical fitting method,and influences of different parameters of initial up-warp deformation on the stability of track system at high temperature are analyzed by formula method. Results show that if the chord length of initial up-warp is shorter than 1. 5 m and the temperature is less than 10 ℃,track slab up-warp tends to occur. In the case of large de-bonding area of the track slab,up-warp deformation is not likely to be generated. Different temperature rises correspond to different unfavorable chord lengths and degrees of initial up-warp. When chord length of initial up-warp of the track slab is about 5 ~ 6 m,it is most difficult to keep the degree of up-warp rise of 2 mm.

关 键 词：高速铁路 CRTSⅡ型板式轨道 能量变分 稳定性 高温 

分 类 号：U213.213[交通运输工程—道路与铁道工程]