西北工程技术学报2025，Vol.24Issue(2)：152-162,170,12.
车轮滚动作用下带缺陷无砟轨道和路基的动应力响应
Dynamic Stress Response of Defective Ballastless Track and Subgrade Under Wheel Rolling Action
摘要
Abstract
To explore the impact of defects in the ballastless track subgrade of high-speed railways,a detailed wheel-track-subgrade-foundation coupling dynamic model has been developed.This model employs a wheel-rail rolling contact algorithm to describe the dynamic interaction between the wheel and rail.It replaces the infinite domain foundation with a three-dimensional viscoelastic static-dynamic unified artificial boundary,considering the finite elasticity of the substructure beneath the track and the initial static state before the wheel starts rolling.The model simulates the wheel accelerating from rest to 45 km/h and then continuing to roll at that constant speed.Under these conditions,the dynamic stress responses caused by the failure of the rubber pad directly beneath the rail seat,the voids in the track slab,the voids in the cement-asphalt(CA)mortar layer,and the voids in the surface layer of the subgrade are investigated.The results indicate that the failure of the rubber pad can lead to changes in the tensile and compressive nature of the dynamic stress in the track slab,as well as increases and decreases in the magnitude of the dynamic stress components.The stress path in the surface layer of the subgrade changes significantly,with a notable increase in intensity;the variation of dynamic stress with depth and the abrupt changes at the interface are significantly larger than in the normal model.Failure at the unit scale only has a significant impact on adjacent units,with little effect on units further away,and the impact on the track slab is greater than that on the surface layer of the subgrade.The complete failure of the rubber pad significantly alters the vertical dynamic stress spectrum of the track slab and the surface layer of the subgrade.关键词
精细化研究/轨道和路基脱空/动应力响应特征/轮轨滚动接触/高速铁路无砟轨道Key words
elaborate investigation/voids in track and subgrade/characteristics of dynamic stress response/wheel-rail rolling contact/ballastless track for high-speed railway分类
交通工程引用本文复制引用
薛富春..车轮滚动作用下带缺陷无砟轨道和路基的动应力响应[J].西北工程技术学报,2025,24(2):152-162,170,12.基金项目
国家自然科学基金项目(52369020) （52369020）
重庆市留学人员回国创业创新支持计划项目(cx2019161) （cx2019161）
