| 考虑界面初始黏结缺陷的CRTS Ⅱ型板式无砟轨道温度变形 |
| |
| 引用本文： | 粟淼,朱琦治,戴公连,彭晖.考虑界面初始黏结缺陷的CRTS Ⅱ型板式无砟轨道温度变形[J].交通运输工程学报,2020,20(5):73-81. |
| |
| 作者姓名： | 粟淼 朱琦治 戴公连 彭晖 |
| |
| 作者单位： | 1.长沙理工大学 土木工程学院, 湖南 长沙 4101142.长沙理工大学 南方地区桥梁长期性能提升技术 国家地方联合工程实验室, 湖南 长沙 4101143.中南大学 土木工程学院, 湖南 长沙 410075 |
| |
| 基金项目： | 实验室开放基金;国家自然科学基金 |
| |
| 摘 要： | 针对中国高速铁路CRTSⅡ型板式无砟轨道界面初始黏结缺陷导致轨道结构温度变形进一步增大的现象, 基于电荷耦合器件(CCD)工业相机与计算机图片处理技术, 建立了板式无砟轨道界面空隙率试验检测系统, 测试了3块CRTSⅡ型板式无砟轨道板与水泥沥青(CA)砂浆界面的初始空隙率; 在有限元模型中以界面空隙率定量表征了界面的黏结状态, 即根据界面空隙率检测结果, 考虑界面存在一定量值的初始空隙率, 并假设这些空隙均匀分布在整个界面上, 系统分析了界面初始黏结缺陷对板式无砟轨道温度变形的影响。研究结果表明: 3块轨道板样本界面的初始平均空隙率为22.3%, 界面四周的初始黏结状态明显差于轨道板界面中心; 在正、负竖向温度梯度作用下, CRTSⅡ型板式无砟轨道分别呈现中心上拱和四周翘曲的温度变形模式; 正温度梯度作用下轨道板最大温度变形与不考虑界面初始黏结缺陷相比增大了7.8%~10.1%, 且随着界面初始空隙率的进一步增大, 轨道板最大上拱温度变形呈线性增大趋势; 负温度梯度作用下, 界面空隙率的增大对轨道板温度变形的影响不大; 在分析CRTSⅡ型板式无砟轨道温度变形时应适当考虑轨道板与CA砂浆的界面初始黏结缺陷, 研究结果可为分析CRTSⅡ型轨道板上拱温度变形机理提供参考。
|
| 关 键 词： | 高速铁路 CRTSⅡ型无砟轨道 温度变形 界面初始黏结缺陷 图像处理 有限元分析 |
| 收稿时间： | 2020-05-08 |
Temperature deformation of CRTSⅡslab ballastless track considering interfacial initial bond defects |
| |
| SU Miao,ZHU Qi-zhi,DAI Gong-lian,PENG Hui.Temperature deformation of CRTSⅡslab ballastless track considering interfacial initial bond defects[J].Journal of Traffic and Transportation Engineering,2020,20(5):73-81. |
| |
| Authors: | SU Miao ZHU Qi-zhi DAI Gong-lian PENG Hui |
| |
| Affiliation: | 1.School of Civil Engineering, Changsha University of Science and Technology, Changsha 4101142.National-Local Joint Laboratory of Engineering Technology for Long-Term Performance Enhancement of Bridges in Southern District, Changsha University of Science and Technology, Changsha 410114, Hunan, China3.School of Civil Engineering, Central South University, Changsha 410075, Hunan, China |
| |
| Abstract: | Aiming at the phenomenon that the temperature deformation of China railway track system(CRTS) Ⅱ slab ballastless track in Chinese high-speed railways increases with the interfacial initial bond defects, an detection experimental system for the interfacial porosity of slab ballastless track was established based on the charge coupled device(CCD) industrial camera and the computer image processing technology. The initial porosities of interface between the track slab and the cement asphalt(CA) mortar from three CRTS Ⅱ ballastless track specimens were detected. In the finite element model, the initial porosity was used to quantitatively characterize the interfacial bond states. Considering a certain amount of initial porosity at the interface, according to the test results of interface porosity and assuming these voids evenly distributing on the entire interface, the effects of interfacial initial bond defects on the temperature deformation of slab ballastless track were systematically analyzed. Research result shows that the average interfacial porosity of the three CRTS Ⅱ ballastless track slabs is 22.3%, and the bond state around the bonding interface is significantly worse than that at the central positions of track slab interface. Under the actions of positive and negative vertical temperature gradients, the CRTS Ⅱ ballastless track presents the temperature deformation modes of slab center arch and slab edges warp, respectively. Compared with the track slab without considering the interfacial initial porosity, the maximum temperature deformation of track slab increases by 7.8%-10.1% under the action of positive temperature gradient, and with the further increase of interfacial initial porosity, the maximum arch temperature deformation of track slab increases linearly. Under the action of negative temperature gradient, the increase of interfacial porosity has little effect on the temperature deformation of track slab. The interfacial initial porosity defects between the track slab and the CA mortar should be considered properly when analyzing the temperature deformation of CRTS Ⅱ slab ballastless track. The research results can provide references for analyzing the temperature deformation mechanism of CRTS Ⅱ track slab. |
| |
| Keywords: | |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《交通运输工程学报》浏览原始摘要信息 |
|
点击此处可从《交通运输工程学报》下载全文 |
|
