温度荷载下充填层性能对CRTS Ⅲ型板式轨道塑性损伤的影响  

The influence of the performance of the filling layer on the plastic deformation damage of CRTSⅢslab track under temperature load

作　　者：项阳 杨怀志 于连山 张国红[5] 王勇 马昆林[1] 揣贾林鸿 XIANG Yang;YANG Huaizhi;YU Lianshan;ZHANG Guohong;WANG Yong;MA Kunlin;CHUAI Jialinhong(School of Civil Engineering,Central South University,Changsha 410075,China;Beijing-shanghai High-speed Railway Co.,Ltd.,Beijing 100089,China;China Railway Bridge Bureau Ninth Engineering Co.,Ltd.,Zhongshan 528451,China;China Railway 21 Bureau Group Co.,Ltd.,Lanzhou 730070,China;China Railway 12th Bureau Group Co.,Ltd.,Taiyuan 030027,China;Bridge Construction Co.,LTD.,China Railway 24 Bureau Group,Nanchang 330100,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]京沪高速铁路股份有限公司,北京100089 [3]中铁大桥局第九工程有限公司,广东中山528451 [4]中铁二十一局集团有限公司,甘肃兰州730070 [5]中铁十二局集团有限公司,山西太原030027 [6]中铁二十四局集团桥梁建设有限公司,江西南昌330100

出　　处：《铁道科学与工程学报》2025年第2期590-601,共12页Journal of Railway Science and Engineering

基　　金：京沪高速铁路股份有限公司科技研究项目(京沪科研-2024-17);湖南省自然科学基金资助项目(2022JJ30732)。

摘　　要：自密实混凝土(self-compacting concrete, SCC)浇筑的充填层是CRTS Ⅲ型板式轨道的核心部件,在较大正温度梯度荷载下,充填层易出现塑性损伤,从而导致轨道结构产生病害。为探究充填层性能对板式轨道塑性损伤的影响,分别制作了高、中、低3组弹性模量的SCC试件,测试并拟合了每组SCC本构曲线,推导了CDP参数,导入ABAQUS软件对应建立了不同充填层性能的轨道结构塑性损伤有限元模型,计算了不同温度荷载下,轨道结构的应力、位移及塑性损伤变化情况,分析了充填层力学性能对板式轨道塑性损伤的影响。研究结果表明:在大温度梯度荷载工况下,充填层更易发生塑性损伤且损伤发展速度较快,该工况下充填层主要发生受拉损伤,损伤位置从充填层凸台上方最先出现;随着温度上升,板角也出现损伤,凸台上方的损伤向整个充填层扩展。在整体升温与温度梯度组合荷载下,轨道结构温度变化相对均匀,采用低弹性模量的充填层,可以显著延迟充填层塑性损伤的发生时间,有效降低损伤发展速度,使充填层以受压损伤为主,损伤位置主要从板角出现且仅在板角区域发展。因此,在极端气候地区应监测轨道结构温度,同时降低充填层弹性模量从而减轻轨道结构损伤,并可将塑性损伤控制在板角区域,利于轨道的检修及养护。The filling layer poured with self-compacting concrete(SCC)is a core component of the CRTSIII type slab track.Under large positive temperature gradient loads,the filling layer is prone to plastic damage,which can lead to structural damage in the track system.To investigate the influence of filling layer’s properties on plastic damage in slab track systems,three groups of SCC specimens with high,medium,and low elastic moduli were prepared.After testing and fitting the constitutive curves of each SCC group,the CDP parameters were derived.Finite element models of track structure plastic damage were then established in ABAQUS software,incorporating different filling layer properties.The stress,displacement,and plastic damage evolution of the track structure were calculated under different temperature loads to analyze the mechanical effects of the filling layer on plastic damage in the slab track.The results show that plastic damage is more likely to occur,and the damage develops more rapidly under high temperature gradient loads.Under this condition,tensile damage mainly occurs,and the damage initiates at the top of the fill boss.As the temperature rises,the plate angle is also damaged,and the damage above the boss extends to the entire pack.However,under the coupled load of overall temperature rise and temperature gradient,the track structure is heated more uniformly.By combining measures to reduce the elastic modulus of the filling layer,the onset of plastic damage in the filling layer can be significantly delayed,and the rate of damage development can be effectively reduced.In this scenario,the filling layer is dominated by compressive damage,and the damage primarily initiates at the plate angle and develops only within the plate angle area.Therefore,it is essential to monitor the temperature of the track structure in extreme climate areas,reduce the elastic modulus of the filling layer to mitigate track structure damage,and control plastic damage in the plate angle area.These measures are conducive to the maint

关 键 词：CRTSⅢ型板式轨道 充填层 塑性损伤 荷载效应 

分 类 号：U213.244[交通运输工程—道路与铁道工程]