铁道科学与工程学报2017，Vol.14Issue(11)：2299-2308,10.
高速铁路无砟轨道路基动应力频谱特性研究
Research on dynamic stress frequency spectrum of ballastless track subgrade of high speed railway
摘要
Abstract
A three-dimensional finite element model of the ballastless track-subgrade system was established, and then the operation process of a CRH380A train with eight cars was modeled to investigate the spatio-temporal distribution and spectral characteristics of dynamic stresses of ballastless track subgrade under vehicle dynamic loads. The results of the analyses indicate that the time-history of vertical dynamic stresses changed periodically for hump and wave patterns. The attenuation rate of dynamic stresses was about 60% at the bottom of embankment. The frequencies of dynamic stresses acting on subgrade was 1 to 4 times the fundamental frequency generated by the vehicle length and mainly controlled by vehicle length, bogie intervals and train speed, and the principal frequency of dynamic stresses was not affected by track irregularity. According to the characteristics of dynamic stress time-history and the frequency, a load functional expression of subgrade was constructed with respect to the situation that a passing train on CRTSⅡ-type slab ballastless track has an axle load of 140 kN, which might provided design load for the dynamic test of filler and subgrade structure design.关键词
无砟轨道路基/列车动荷载/动应力/频谱Key words
ballastless track subgrade/vehicle dynamic load/dynamic Stress/frequency spectrum分类
建筑与水利引用本文复制引用
王启云,张丙强,赵卫华,陈军浩..高速铁路无砟轨道路基动应力频谱特性研究[J].铁道科学与工程学报,2017,14(11):2299-2308,10.基金项目
国家自然科学基金资助项目(51508097) （51508097）
福建省自然科学基金资助项目(2015J05090) （2015J05090）
