铁道标准设计2024，Vol.68Issue(7)：53-62,10.DOI:10.13238/j.issn.1004-2954.202212160005
考虑路基剪切效应的高速铁路有砟轨道-车辆系统移动元分析
Moving Element Analysis of Ballast Track-vehicle Systems for High-speed Railway Considering Shear Effect of Subgrade
摘要
Abstract
To consider the shear effect of subgrade soil in the existing three-layer discrete supported beam for ballasted track model,the shear layer is discretized on the basis of Pasternak two-parameter foundation model.The moving element method is used to establish the ballasted track-vehicle coupling dynamics model considering the shear effect of subgrade soil.The moving element method is combined with MATLAB to compile the calculation program.Through MATLAB numerical calculation,the influence of subgrade shear effect on vehicle-rail coupling system and the influence of track irregularity and sleeper empty suspension on system dynamic characteristics are studied.The results show that when considering the subgrade shear effect,the displacement responses of rail,sleeper and ballast are all reduced in different degrees,and the phase difference between rail and ballast is gradually increasing,and the acceleration responses of the three are also obviously reduced.Their inhibition effects on acceleration responses are reduced from ballast to sleeper in turn,but the acceleration reduction of rail is greater than that of ballast,which has a certain,but not obvious,impact on wheel-rail contact force,and the reduction is only 0.85% .The irregularity amplitude and wavelength characteristics will have a significant impact on the dynamic response of the system.With the increase of the amplitude and shortwave component,the dynamic response of the system will be significantly improved,in which the shortwave irregularity of about 2 m and the 90th percentile spectrum will have a significant impact on the dynamic characteristics of the system.When the train passes through the unsupported sleeper area,the dynamic response of the track structure of the unsupported sleeper and the surrounding area will change suddenly,resulting in the system dynamic response exceeding the limit.The coupling model of ballasted track and vehicle based on moving element method and its correlation analysis established in this paper can provide reference for vibration analysis of high-speed railway.关键词
高速铁路/有砟轨道/移动单元法/路基剪切/轨道不平顺/轨枕空吊Key words
high-speed railway/ballasted track/moving element method/subgrade shear/track irregularity/unsupported sleeper分类
交通工程引用本文复制引用
雷拓,魏鎏勇,凡尊军,徐龙祥,晋婷婷..考虑路基剪切效应的高速铁路有砟轨道-车辆系统移动元分析[J].铁道标准设计,2024,68(7):53-62,10.基金项目
陕西省自然科学基础研究项目(2021JM-178) （2021JM-178）
