换填接缝后连续型无砟轨道温度应力控制措施研究  

Research on Control Measures for Temperature Stress of Continuous Ballastless Track After Seam Replacement

作　　者：禹雷 谈遂 吉哲颖[5] 张鲁顺 张东风 凌锋 冯诚禹 YU Lei;TAN Sui;JI Zheying;ZHANG Lushun;ZHANG Dongfeng;LING Feng;FENG Chengyu(China Railway Engineering Design and Consulting Group Co.,Ltd.,Beijing 100055;National Engineering Research Center of High-speed Railway Construction Technology,Changsha 410018;China Railway Group Limited,Beijing 100039;School of Civil Engineering,Central South University,Changsha 410075,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中铁工程设计咨询集团有限公司,北京100055 [2]高速铁路建造技术国家工程研究中心,长沙410018 [3]中国中铁股份有限公司,北京100039 [4]中南大学土木工程学院,长沙410075 [5]西南交通大学土木工程学院,成都610031

出　　处：《铁道勘察》2025年第1期1-6,12,共7页Railway Investigation and Surveying

基　　金：湖南省自然科学基金项目(2021JJ30053);中国国家铁路集团有限公司科技研究开发计划项目重点课题(L2023G007,L2022G007);高速铁路建造技术国家工程研究中心开放基金课题(HSR-202109);中国中铁股份有限公司科技研究开发计划重点课题(2020-专项-02,2021-专项-08);中铁工程设计咨询集团有限公司科研项目重点课题(研-2021-10)。

摘　　要：夏季高温作用下,连续型无砟轨道易发生层间离缝甚至热胀上拱失稳,严重影响高速列车运行安全。建立连续型无砟轨道温度应力计算模型,研究整体温升50℃时,不同植筋方案对换填接缝后连续型无砟轨道损伤和受力的影响。研究表明,(1)在4种植筋方案中,方案4层间界面损伤峰值为0.9,方案2层间界面损伤峰值为0.81,均未超过1。(2)4种植筋方案均表现为轨道板顶面纵向应力发生显著下降,而轨道板底面纵向应力显著上升,这表明接缝换填后,接缝附近轨道板顶面纵向应力得到释放,而轨道板底面应力大幅增加;方案3轨道板顶面应力降幅最大,为38.8%,最有利于释放轨道板温度应力;方案4轨道板底面应力增幅最大,达35.2%,对轨道板最为不利。Under the influence of high temperature in summer,continuous ballastless tracks are prone to interlayer separation and even instability due to thermal expansion,which severely impacts the safety of high-speed train operation.This paper established a calculation model for temperature stress in continuous ballastless tracks and investigated the effects of different post installed rebar schemes on the damage and stress of continuous ballastless tracks after joint filling when the overall temperature rises by 50℃.The study reveals:(1)Among the four post installed rebar schemes,the peak interlayer interface damage for Scheme 4 is 0.9,and for Scheme 2,it is 0.81,both of which do not exceed 1.Among the four schemes,Scheme 2 is the most optimal.(2)All post installed rebar schemes show a significant decrease in longitudinal stress on the top surface of the track slab and a significant increase in longitudinal stress on the bottom surface of the track slab,indicating that after joint filling,the longitudinal stress near the joint is released on the top surface of the track slab,while the stress on the bottom surface increases significantly.Scheme 3 exhibits the greatest decrease in top surface stress of the track slab,by 38.8%,which is most favorable for releasing the temperature stress of the track slab.Scheme 4 shows the largest increase in bottom surface stress of the track slab,reaching 35.2%,which is the most unfavorable for the track slab.

关 键 词：高速铁路 连续型无砟轨道 层间离缝 热胀上拱 接缝换填 植筋加固 

分 类 号：U238[交通运输工程—道路与铁道工程] U213.2