箱式路基差异沉降对无砟轨道静力行为影响  

Impact of Differential Settlement of Box-type Subgrade on Static Mechanical Behavior of Ballastless Track

作　　者：余雷 陈文东 王亚威 王祥[3] YU Lei;CHEN Wendong;WANG Yawei;WANG Xiang(China Railway Economic and Planning Research Institute,Beijing 100038,China;Southwest Jiaotong University,Chengdu 610031,China;China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China)

机构地区：[1]中国铁路经济规划研究院有限公司,北京100038 [2]西南交通大学,成都610031 [3]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《高速铁路技术》2025年第1期1-7,共7页High Speed Railway Technology

基　　金：中国铁路总公司科技研究开发计划课题(2017G008-C);中铁第四勘察设计院集团有限公司重大课题(2020K035)。

摘　　要：箱式路基是由钢筋混凝土空心箱体作为路基主体的新型路基结构。针对箱式路基结构上无砟轨道对箱式路基差异沉降的静力行为响应问题,以衢丽铁路的无砟轨道-箱式路基结构为依托,通过数值模拟建立了无砟轨道-箱式路基三维有限元模型,分析了4种箱式路基沉降类型(错台、折角、对折和横向错位)下轨道结构竖向位移、10 m弦长轨道高低不平顺值和扣件竖向力的变化规律,提出了以扣件竖向力和10 m弦长轨道高低不平顺的限值为依据的无砟轨道下箱式路基的沉降限值控制标准。研究结果表明:(1)箱式路基发生错台型和横向错位型沉降时,沉降变形区呈现轨道结构层间离缝现象,而折角型和对折型沉降时沉降变形区内轨道结构各层间未出现明显层间离缝现象;(2)基于扣件力限制的无砟轨道下箱式路基发生错台、折角、对折、横向错位沉降的限值分别为2.5 mm、39.0 mm、27.6 mm和2.6 mm;(3)基于10 m弦长轨道不平顺限制的4种沉降限值分别为5.2 mm、17.5 mm、8.9 mm和6.5 mm。The box-type subgrade is a novel subgrade structure with reinforced concrete hollow boxes serving as the main body.To determine the static mechanical responses of ballastless track to the differential settlements of box-type subgrade structures,a three-dimensional finite element model of the ballastless track box-type subgrade was established based on Quzhou-Lishui Railway,to analyze the changes in vertical displacement of the track structure,irregularity values of track longitudinal level over a 10 m chord length,and vertical forces in fasteners under four types of box-type subgrade settlement(staggered settlement,angular settlement,folded settlement,and lateral displacement settlement).Based on the limiting values of vertical forces in fasteners and track longitudinal level irregularity over a 10 m chord length,control standards for settlement limits of box-type subgrades under ballastless tracks were proposed.The research findings indicate:(1)When box-type subgrades experience staggered settlement and lateral displacement settlement,interlayer separation occurs in the track structure within the settlement deformation zone,whereas no significant interlayer separation is observed among the layers of the track structure within the settlement deformation zone during angular settlement and folded settlement.(2)The settlement limits for staggered settlement,angular settlement,folded settlement,and lateral displacement settlement of box-type subgrades under ballastless tracks,based on fastener force limitations,are 2.5 mm,39.0 mm,27.6 mm,and 2.6 mm,respectively.(3)The four settlement limits based on track irregularity restrictions over a 10 m chord length are 5.2 mm,17.5 mm,8.9 mm,and 6.5 mm,respectively.

关 键 词：箱式路基结构 无砟轨道 差异沉降 有限元法 静力行为 

分 类 号：U213.1[交通运输工程—道路与铁道工程]