温度荷载作用下CRTSⅡ型板式无砟轨道材料参数对界面损伤的影响  

Influence of Material Parameters of CRTS II Slab Ballastless Tracks on Interface Damage Under Different Temperature Loads

作　　者：李全鹏 LI Quan-peng(State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China)

机构地区：[1]西南交通大学,牵引动力国家重点实验室

出　　处：《交通运输工程与信息学报》2019年第2期51-57,共7页Journal of Transportation Engineering and Information

基　　金：国家重点基础研究发展计划课题(批准号:2013CB036202)

摘　　要：高速铁路板式无砟轨道在施工和服役过程中,结构材料参数可能发生改变,并与其工程设计值有较大差别,这种改变对轨道板与砂浆层之间界面的损伤有何影响,目前还缺乏较深入的研究。本文建立了CRTS Ⅱ型板式无砟轨道有限元模型,采用内聚力模型模拟界面的损伤行为,分析了在90℃/m极端温度梯度荷载作用下,轨道板弹性模量、砂浆层弹性模量和界面黏结强度对轨道板与砂浆层界面损伤的影响。结果表明:轨道板和砂浆层弹性模量对界面损伤的影响规律基本一致,高弹性模量恶化了界面受力情况,将加大界面损伤程度和损伤区域;界面黏结强度对界面损伤有显著的影响,当黏结强度小于其设计值时,界面损伤随黏结强度降低而快速恶化。During the construction and service of slab ballast less tracks for high-speed railways, the material parameters of the track structures may change and show greater differences than their engineering design values. How do these changes affect the damage of the interface between the track slab and mortar layer? To answer this question, additional intensive research is required. This study constructed a finite element model of a CRTS II slab ballastless track using the cohesive zone model to simulate interface damage behaviors. Then, the effects of the track slab elastic modulus, CA mortar elastic modulus, and interface cohesive strength on the damage of the interface between the track slab and CA mortar layer under 90°C/m temperature gradient loads were investigated. Results show that the elastic modulus of the track slab and CA mortar layer exhibited similar influence laws on interface damage, where a higher elastic modulus deteriorated interface stress status and then increased the degree of interface damage and that of damaged areas. In addition, the interface adhesive strength had a considerable impact on interface damage. When the adhesive strength was less than the design value, the interface damage developed rapidly with decreasing adhesive strength.

关 键 词：高速铁路 无砟轨道 轨道结构参数 界面损伤 

分 类 号：U213.3[交通运输工程—道路与铁道工程]