新型装配式无砟轨道设计方案理论与试验研究  

Theoretical and Experimental Research on the Design Scheme for a New Type of Prefabricated Ballastless Track

作　　者：陈潇[1] 任西冲 易正红 CHEN Xiao;REN Xichong;YI Zhenghong(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China;Hubei Key Laboratory of Railway Track Safety Service,Wuhan 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063 [2]铁路轨道安全服役湖北省重点实验室,武汉430063

出　　处：《铁道标准设计》2024年第9期32-39,共8页Railway Standard Design

基　　金：中铁第四勘察设计院集团有限公司科技研发课题(2022K032,2021K004)。

摘　　要：为适应城市轨道交通铺设装配式无砟轨道的发展趋势,克服传统现浇整体道床混凝土浇筑量较大等缺点,提出一种新型装配式无砟轨道结构设计方案,采用理论分析与试验测试相结合的方法,建立轨道系统有限元精细化分析模型和室内实尺试验模型,对城市轨道交通新型装配式无砟轨道力学响应开展理论分析和试验研究。研究表明:新型装配式无砟轨道在列车荷载作用下轨道板最大拉应力为0.696 MPa,最大位移为0.04 mm;静载试验中轨道结构应变随着垂向静荷载增大呈线性增加趋势,在510 kN垂向加载力作用下轨道板最大压应变为38.4με,卸载后残余变形很小,未出现明显塑性变形,结构承载能力满足要求;疲劳试验中随着疲劳加载次数增加,轨道板混凝土和钢筋应变在较小范围内变化,钢筋变化最大幅值为3με,混凝土最大变化幅值为10με,结构未见裂缝,抗疲劳性能良好;轨道结构加速度和位移峰值从上往下逐层递减,衰减效果显著;结构第一阶主频为70 Hz,与车辆系统频率相差较大,不会产生共振。To adapt to the development trend of laying prefabricated ballastless tracks in urban rail transit and to overcome the disadvantages of traditional cast-in-place monolithic track bed,such as the large amount of concrete required,a new design scheme for a prefabricated ballastless track structure was proposed.This study combined theoretical analysis and experimental testing to establish a refined finite element analysis model and a full-scale indoor test model of the track system.Theoretical analysis and experimental research on the mechanical response of the new prefabricated ballastless track for urban rail transit were carried out.The results showed that the maximum tensile stress of the track slab in the new prefabricated ballastless track under the action of train load was 0.696 MPa,and the maximum displacement was 0.04 mm.In static load test,the strain of the track structure increased linearly with the increase in vertical static load.Under a vertical load of 510 kN,the maximum strain of the track slab was 38.4με.After unloading,the residual deformation was minimal,with no obvious plastic deformation,and the structural bearing capacity met the requirements.In the fatigue test,as the number of fatigue loading cycles increased,the strain of concrete and steel reinforcement in track slab changed within a small range,with the maximum variation in steel strain being 3μεand in concrete strain being 10με.No cracks were found in the structure,indicating good fatigue resistance.The peak acceleration and displacement of the track structure decreased progressively from top to bottom,showing a significant attenuation effect.The first natural frequency of the structure was 70 Hz,which differed significantly from the vehicle system frequency,ensuring no resonance.

关 键 词：城市轨道交通 装配式无砟轨道 结构方案 理论分析 实尺试验 

分 类 号：U239.5[交通运输工程—道路与铁道工程] U213.2