| 多雨地区双块式无砟轨道湿态混凝土力学性能 |
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| 引用本文： | 杨荣山,李莹,许钊荣,刘佳.多雨地区双块式无砟轨道湿态混凝土力学性能[J].西南交通大学学报,2022,57(4):840-847. |
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| 作者姓名： | 杨荣山 李莹 许钊荣 刘佳 |
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| 作者单位： | 1.西南交通大学高速铁路线路工程教育部重点实验室，四川 成都 6100312.中国铁路设计集团有限公司，天津 300308 |
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| 基金项目： | 国家自然科学基金（51778543,51978584）； |
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| 摘 要： | 长期处于水环境中的双块式无砟轨道内部存在不均匀的湿度场，而湿度会对轨道结构的力学性能产生一定的影响. 为研究水环境中双块式无砟轨道内部不同湿度状态下混凝土宏观力学性能，结合水环境中双块式无砟轨道的湿度分布情况，建立了混凝土基质纳观组分（C-S-H）分子动力学模型，对混凝土基质展开多尺度计算，并进行两级均匀化分析. 结果表明:水环境中的双块式无砟轨道结构表层湿度的梯级分化明显，轨道内部的湿度差最高可达38.41%；混凝土的弹性模量和泊松比随饱和度的增加而增大；混凝土饱和度由0增加到100.00%时，支承层、道床板及轨枕混凝土弹性模量的增幅分别可达35.0%、19.5%、16.2%.
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| 关 键 词： | 双块式无砟轨道 水环境 湿度场 湿态混凝土 材料性能 |
| 收稿时间： | 2020-05-27 |
Mechanical Properties of Wet Concrete Inside Double-Block Ballastless Tracks in Rainy Areas |
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| YANG Rongshan,LI Ying,XU Zhaorong,LIU Jia.Mechanical Properties of Wet Concrete Inside Double-Block Ballastless Tracks in Rainy Areas[J].Journal of Southwest Jiaotong University,2022,57(4):840-847. |
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| Authors: | YANG Rongshan LI Ying XU Zhaorong LIU Jia |
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| Affiliation: | 1.MOE key Laboratory of High-speed Railway Engineering, Southwest Jiaotong University, Chengdu 610031, China2.China Railway Design Corporation, Tianjin 300308, China |
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| Abstract: | An uneven humidity field forms inside double-block ballastless tracks long located in the water environment, and humidity will affect the mechanical properties of track structures. In order to study the macroscopic mechanical properties of concrete under different humidity conditions inside the double-block ballastless tracks in the water environment, combined with the humidity distribution of the double-block ballastless track in the water environment, the molecular dynamics of the nano-component (C-S-H) of the concrete matrix is established. Multi-scale calculation of concrete matrix and two-level homogenization analysis are conducted. The results show that the surface humidity of double-block ballastless tracks in the water environment show distinct gradient differentiation, and the maximum humidity difference inside the tracks can reach up to 38.41%; the elastic modulus and Poisson’s ratio of concrete increase with saturation; when concrete saturation is increased from 0 to 100%, the increases of the elastic modulus of the bearing layer, the track bed slab and the sleeper concrete attain 35.0%, 19.5% and 16.2%, respectively. |
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