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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第11卷    第1期    总第57期    2014年2月

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文章编号:1672-7029(2014)01-0043-06
抑制CRTSⅡ型轨道板与水泥沥青砂浆离缝的
王雪松1,曾志平1,2,元强1,郭建光3,张捍东3

(1.中南大学 土木工程学院,湖南 长沙 410075;
2.中南大学 重载铁路工程结构教育部重点实验室,湖南 长沙 410075;
3.沪昆铁路客运专线江西有限责任公司,江西 南昌 330002
)

摘 要: 采用空间梁单元模拟钢轨,实体单元模拟轨道板,水泥沥青砂浆和支承层(底座);钢轨与轨道板,支承层(底座)与基础之间的竖向连接以弹簧单元模拟,建立在温度梯度荷载作用下,CRTSⅡ型板式无砟轨道结构力学特性分析模型, 基于MATLAB编制相应的计算程序。以桥上CRTSⅡ型板式无砟轨道为例,考虑3种约束工况(轨道板纵接之前;轨道板纵连之后、铺轨之前;轨道板铺轨之后),分析轨道板的不同负温度梯度,以及轨道板与砂浆层之间不同的黏结条件对轨道系统受力与变形的影响,并求出对应不同的黏结条件的离缝临界温度梯度。研究结果表明:砂浆的拉应力从板端迅速向板中衰减;轨道板纵连对轨道板的翘曲位移和砂浆的拉应力影响很大,钢轨和扣件的约束对此却影响却很小;板角处砂浆一旦出现离缝,则其离缝的深度很容易继续扩大。提出了抑制CRTSⅡ型轨道板与砂浆离缝的施工技术措施。

 

关键字: CRTSⅡ板式无砟轨道;水泥沥青砂浆;翘曲变形;临界温度梯度;离缝

Study of technical measures to restrain the gap between CRTSⅡslab and cement asphalt mortar
WANG Xuesong1, ZENG Zhiping1,2, YUAN Qiang1, GUO Jianguang3, ZHANG Handong3

1. School of Civil Engineering, Central South University, Changsha 410075, China;
2. Key Laboratory of Engineering Structure of Heavy Railway of Ministry of Education, Changsha 410075, China;
3. Jiangxi Co. Ltd. of Shanghai-Kunming Railway Passenger Special Line, Nanchang 330002, China

Abstract:Mechanical characteristic model of CRTSⅡ slab track was established based on temperature gradient load by utilizing spatial beam element to simulate rail, adopting solid element to simulate slab, cement asphalt morter, supporting layer(base), and using spring element to reflect the correlation between rail and slab, supporting layer(base) and foundation, and then the corresponding calcalation program was developed based on MATLAB. Take CRTSⅡ slab track on bridge as an example to analyze the influence of different minus temperature gradient between the upper and lower surface of slab and different bonding conditions between slab and mortar on the force and deformation of track system under three working conditions (slab and slab have not been yet longitudinal connected; slab and slab have been longitudinal connected but not been restricted by rail; slab and slab have been longitudinal connected and restricted by rail and fasteners). So as to calculate the critical temperature gradient of different bonding conditions. The results show that tensile stress of mortar attenuates rapidly from slab side to middle. The longitudinal connection influences warping displacement greatly, and the rail and fasteners’ restrict have a little effect on it. Once there exists gap in slab angle, the depth of the gap could broaden very easily. The construction technical measures were proposed to restrain the gap between CRTSⅡ slab and mortar based on the results.

 

Key words: CRTSⅡ slab track; cement asphalt mortar; warping deformation; critical temperature gradient; gap

ISSN 1672-7029
CN 43-1423/U

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