客货共线铁路弹性支承块式无砟轨道混凝土支承块结构承载力试验  

Test on Bearing Capacity of Concrete Block on Ballastless Tracks with Elastic Bearing Blocks for Mixed Passenger and Freight Railway

作　　者：尹银艳 易正红 张培辉 YIN Yinyan;YI Zhenghong;ZHANG Peihui(China Railway SIYUAN Survey and Design Group Co.,Ltd.,Wuhan Hubei 430063,China;Hubei Key Laboratory of Railway Track Safety Service,Wuhan Hubei 430063,China;Guangdong Jiehui Railway Co.,Ltd.,Jieyang Guangdong 522000,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,湖北武汉430063 [2]铁路轨道安全服役湖北省重点实验室,湖北武汉430063 [3]广东揭惠铁路有限责任公司,广东揭阳522000

出　　处：《中国铁路》2023年第2期25-32,共8页China Railway

基　　金：广东省交通运输厅科技项目(2021-J-001);中铁第四勘察设计院集团有限公司科研项目(2022K106)。

摘　　要：以客货共线铁路弹性支承块式无砟轨道混凝土支承块为对象,通过开展承载力破坏试验,验证Q/CR 9130—2018《铁路轨道设计规范(极限状态法)》中无砟轨道钢筋混凝土结构抗力计算方法相关规定。结果表明:(1)混凝土支承块结构符合平截面假定,混凝土支承块结构中和轴在截面中线靠上;(2)面支承试件裂缝发展、破坏形式等静载力学性能与简支梁不同,无砟轨道结构极限状态不能照搬GB 50010—2010《混凝土结构设计规范》的相关规定;(3)建议重点开展单元式无砟轨道结构静载开裂特性试验,并对裂缝截面处纵向受拉钢筋应力计算公式进行优化研究。With the concrete block on ballastless tracks with elastic bearing blocks for mixed passenger and freight railway as the object,the bearing capacity failure test is carried out to verify the relevant provisions of the resistance calculation method of the reinforced concrete structure of ballastless track in Code for Design on Track of Railway(Limit State Method)(Q/CR 9130-2018).The results show that:(1)The concrete block structure conforms to the assumption of the plane section,and the neutral axis of the concrete block structure is above the centerline of the section;(2)The static mechanical properties such as crack development and failure form of surface bearing specimens are different from those of simply-supported beams.Relevant provisions of Code for Design of Concrete Structures(GB 50010-2010)cannot be simply adopted to the ultimate limit state of ballastless track structure;(3)It is suggested to focus on the static load cracking characteristic test of unit ballastless track structure and optimize the calculation formula of longitudinal tensile reinforcement stress at the crack section.

关 键 词：客货共线铁路 弹性支承块式无砟轨道 混凝土支承块 极限状态法 承载力试验 

分 类 号：U213.2[交通运输工程—道路与铁道工程]