| 疲劳荷载下无砟轨道混凝土中氯离子传输研究 |
| |
| 引用本文： | 任娟娟,杜威,邓世杰,凤翔.疲劳荷载下无砟轨道混凝土中氯离子传输研究[J].西南交通大学学报,2021,56(3):510-516. |
| |
| 作者姓名： | 任娟娟 杜威 邓世杰 凤翔 |
| |
| 基金项目： | 国家自然科学基金（52022085）；中国铁路设计集团有限公司科技开发课题（2020YY340120-1） |
| |
| 摘 要： | 疲劳荷载作用下，无砟轨道混凝土的抗氯离子渗透性能是影响其服役特性的主要因素之一. 为分析混凝土在疲劳荷载作用下氯离子的传输变化规律，首先针对浸泡于氯离子溶液的混凝土试件进行弯曲疲劳试验，然后利用COMSOL有限元软件建立结构力学场与氯离子传输场的两场耦合模型，模拟氯离子在混凝土中的扩散行为. 研究结果表明:当侵蚀时间为2 d时，应力比为0.3、0.5和0.7对应的氯离子扩散深度分别为7、11、16 mm，混凝土中氯离子扩散深度随荷载应力比的增大而增大；两场耦合有限元模型计算得到的氯离子含量与试验测试结果基本吻合，验证了模型的合理性；混凝土中氯离子扩散深度随侵蚀时间的增大而增大，采用一元二次多项式可较好地描述扩散深度与侵蚀时间的关系.
|
| 关 键 词： | 无砟轨道 混凝土 氯离子传输 疲劳荷载 |
| 收稿时间： | 2019-07-13 |
Chloride Ion Transport in Concrete of Ballastless Track under Fatigue Loading |
| |
| REN Juanjuan,DU Wei,DENG Shijie,FENG Xiang.Chloride Ion Transport in Concrete of Ballastless Track under Fatigue Loading[J].Journal of Southwest Jiaotong University,2021,56(3):510-516. |
| |
| Authors: | REN Juanjuan DU Wei DENG Shijie FENG Xiang |
| |
| Abstract: | The chloride ion penetration resistance of concrete structure of ballastless track under fatigue load is one of the main factors affecting its service performance. In order to analyze the variation of chloride ion transport in concrete under fatigue load, the bending fatigue loading test of concrete specimens immersed in chloride solution was carried out. A two-field coupling model based on the structural mechanics field and the chloride transport field was then established with COMSOL finite element software to simulate the chloride diffusion behavior in concrete. The results show that when the erosion time is 2 d, the chloride ion diffusion depths corresponding to the stress levels of 0.3, 0.5, and 0.7 are 7, 11 and 16 mm, respectively, which indicates that the chloride diffusion depth in concrete increases with an increase in fatigue stress level. The chloride ion concentration calculated by the two-field coupling finite element model is basically consistent with the experimental test results, which proves that the model is reasonable. What’s more, the diffusion depth of chloride in concrete increases with the erosion time, and the relationship between them can be described well by a unary quadratic polynomial. |
| |
| Keywords: | |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《西南交通大学学报》浏览原始摘要信息 |
|
点击此处可从《西南交通大学学报》下载全文 |
|
