中南大学学报（自然科学版）2018，Vol.49Issue(3)：764-770,7.DOI:10.11817/j.issn.1672-7207.2018.03.033
道砟胶分段固化道床动力性能测试与分析
Dynamic testing and analysis of ballasted track of different stiffness sections using polyurethane ballast reinforcement technique
摘要
Abstract
The serious degradation of the railway track is observed in the transition zones between the ballasted track and the ballastless track. The degradation is aroused by the abrupt variation of the track stiffness which is led by the vertical settlement of the track. In order to solve these problems, the polyurethane ballast reinforcement technique was adopted to form a continuous and even stiffness transition in the ballasted bed which was divided into three different stiffness sections. The dynamic test was carried out for the track using the ballast reinforcement technique. The results show that the safety index of the track line can be achieved using the ballast reinforcement technique. The dynamic stiffness of the ballasted bed in the three section is 91, 126 and 273 kN/mm, respectively, which is corresponding to different amounts of bonding areas from small to large. And the stiffness of the ballasted bed with these three bonding areas increases by 1.28 times, 1.75 times and 3.78 times, respectively, contrasted to that of the common ballasted bed. Thus, the wheel / rail vertical force, the wheel unloading ratio, the vertical displacement of the rail and the sleeper gradually increase, but the vertical displacement of the rail, the vertical displacement of the sleeper, and the vibration characteristics of the sleeper gradually decrease from the low stiffness section to the high stiffness section. In general, the ballasted track using the polyurethane ballast reinforcement technique achieves the best dynamic stiffness transition effect of the track line.关键词
有砟−无砟轨道/过渡段/道砟胶固化道床技术/动态测试/轨道刚度Key words
ballasted and ballastless track/transition zones/polyurethane ballast reinforcement technique/dynamic test/track stiffness分类
交通工程引用本文复制引用
亓伟,刘玉涛,李成辉..道砟胶分段固化道床动力性能测试与分析[J].中南大学学报（自然科学版）,2018,49(3):764-770,7.基金项目
国家杰出青年科学基金资助项目(51425804) （51425804）
高速铁路基础研究联合基金重点支持项目(U1334203,U1234201) (Project(51425804) supported by the National Natural Science Foundation of China （U1334203,U1234201）
Projects(U1334203, U1234201) supported by the National Natural Science Jointed High Speed Railway Key Program Foundation of China) （U1334203, U1234201）
