铁道标准设计2017，Vol.61Issue(7)：56-61,6.DOI:10.13238/j.issn.1004-2954.2017.07.013
高铁列车动载作用下路基动力特性及累积变形规律研究
Study on Dynamic Characteristics and Cumulative Deformation Law of Subgrade under Dynamic Load of High-speed Train
赵莹 1商拥辉1
作者信息
- 1. 黄淮学院建筑工程学院,河南驻马店 463000
- 折叠
摘要
Abstract
In order to explore the dynamic characteristics and accumulative deformation of the subgrade under dynamic train load, the causes of the roadbed settlement overrun are analyzed with the field test data based on Shanghai-Nanjing intercity railway project and then the train-track-subgrade coupling vibration system three-dimensional model is established to analyze the influence factors ( such as train speed, bed thickness and rigidity, driving mode ) . Finally, the accumulative deformation law of the foundation bed with 400000 vibrations is analyzed by means of indoor full scale model test. The results show that the dynamic train load is one of the main causes for the subsidence of the subgrade in the operational period. The factors such as train speed, bed thickness and stiffness, and driving mode constitute effects on the dynamic stress and the dynamic displacement of the subgrade;with the increase in the number of cyclic loading, the accumulative deformation of the subgrade develops rapidly during the initial 50000 vibrations and tends to be a slow linear development afterwards. The accumulative deformation is 0. 78 mm after 400000 vibrations with impacted depth of some 5 m.关键词
高速铁路/动力特性/累积变形/数值模型/足尺模型Key words
High-speed railway/Dynamic characteristics/Cumulative deformation/Numerical model/Full scale model test分类
交通工程引用本文复制引用
赵莹,商拥辉..高铁列车动载作用下路基动力特性及累积变形规律研究[J].铁道标准设计,2017,61(7):56-61,6.
