铁道标准设计2018，Vol.62Issue(2)：39-43,5.DOI:10.13238/j.issn.1004-2954.201704130003
大轴重双线铁路路基结构动力学分析
Dynamic Analysis of Subgrade Structure on Double-track Railway of Heavy Axial Load
尹紫红 1赵丰年 1高雪1
作者信息
- 1. 西南交通大学土木工程学院,成都610031
- 折叠
摘要
Abstract
With rapid development of economy,the heavy haul railway is favored by the society because of its good transportation ability.However,the line spacing is limited by the contradiction in land utilization.In order to analyze the influence of different line spacing on the dynamic response of the subgrade structure subject to large axle load,load transfer law and dynamic stress distribution of the subgrade structure are studied under different axle loads,line spacing and bed modulus.The conclusions show that:(1) The dynamic stress of the bed structure in the midline of the double line railway line is increased logarithmically first and then decreased linearly in the depth direction.(2) The dynamic stress peak is mainly related to the line spacing and the axle load,and the position of the peak in the depth direction is mainly related to the line spacing and independent of the axle load.When line spacing is increased by 0.2 m each time,the dynamic stress peak is reduced by 4.8 kPa and the position of the peak in the depth direction is increased by 0.15 m.(3) When the line spacing is less than 4.4 m,the dynamic stress of the subgrade body at the midline of the line spacing is greater than that at the midline of the line.When line spacing is less than 4.4 m,the roadbed structure design should take into account the dynamic stress value at the midline of the line spacing.(4) The attenuation of the elastic modulus of the bed surface is smaller.关键词
重载铁路/双线铁路路基/大轴重/线间距/动力响应Key words
Heavy haul railway/Double-track railway subgrade/Heavy axial load/Line spacing/Dynamic response分类
交通工程引用本文复制引用
尹紫红,赵丰年,高雪..大轴重双线铁路路基结构动力学分析[J].铁道标准设计,2018,62(2):39-43,5.
