CRTSⅡ型板式无砟轨道植筋修复方案优化研究  

Research on CRTSⅡ Slab Ballastless Track Planting Bar Restoration Scheme Optimization

作　　者：黄自鹏 何越磊[1] 路宏遥 赵彦旭 HUANG Zipeng;HE Yuelei;LU Hongyao;ZHAO Yanxu(School of Urban Rail Transportation,Shanghai University of Engineering Science,Shanghai 201620,China;China Railway 21st Bureau Group Co.,Ltd.,Lanzhou 730070,China)

机构地区：[1]上海工程技术大学城市轨道交通学院,上海201620 [2]中铁二十一局集团有限公司,兰州730070

出　　处：《铁道标准设计》2022年第10期52-57,共6页Railway Standard Design

基　　金：国家自然科学基金项目(51978393);甘肃省科技计划项目(19ZD2FA001);中国铁建股份有限公司科技研发项目(2019-B08)。

摘　　要：服役于自然环境下的纵连无砟轨道对温度荷载具有较强敏感性,在夏季高温作用下易产生轨道板上拱与层间相对变形等病害,严重影响列车运行安全。对服役状态下CRTSⅡ型板式无砟轨道进行植筋加固是现阶段控制轨道病害的主要措施。为研究植筋锚固方案的可行性,试验分析植筋后轨道板与砂浆层之间粘结性能变化规律。基于试验,建立CRTSⅡ型板式无砟轨道植筋锚固修复有限元模型,确定了最优的植筋数目和植筋位置。结果表明:轨道板植筋数量超过8根时,对抑制轨道板高温上拱变形的效果无明显差异;建议工务部门在植筋修复后,进一步关注植筋孔与接缝等位置处的开裂与破坏。The longitudinally connected ballastless track in natural environment is highly sensitive to temperature loads.Under the action of high temperature in summer,it is likely to cause such damages as relative deformation of the track slab and relative deformation between layers,which seriously affects the safety of train operation.Reinforcement of CRTSⅡ slab ballastless track in service is the most important measure to control track damages at present.In order to study the feasibility of the anchoring plan of planting bars,the experiment and analysis of the change law of the bond performance between the track slab and the mortar layer with planted bars are conducted.Based on experiments,a finite element model for the anchorage restoration of the CRTSⅡ slab ballastless track is established,and the optimal number and location of the reinforcement are determined.The results show that when the number of bars implanted in the track slab exceeds 8,there is no significant difference in the effect of suppressing track slab deformation at high temperature.It is recommended that the track maintenance department should pay more attention to the cracking and damage at the positions of the bar planting holes and joints after the planting bar is repaired.

关 键 词：无砟轨道 CRTSⅡ型 植筋锚固 剪切试验 方案优化 高速铁路 

分 类 号：U213.244[交通运输工程—道路与铁道工程] U216