铁道科学与工程学报2017，Vol.14Issue(3)：425-436,12.
CRTSⅢ型无砟轨道基础结构冲击试验与数值分析
Full-scale model impacting experiments and numerical analysis on CRTS Ⅲ ballastless track-subgrade system
摘要
Abstract
A full-scale model experiments of wheel-drop impact was performed on a typical CRTS Ⅲ ballastless track-subgrade system. Its three-dimensional dynamical analysis model was established based on the software ANSYS/Ls-Dyna. The dynamical stresses distributions of overall CRTS Ⅲ track-subgrade under wheel-drop impact loads were systematically analyzed on the basis of the comparison of experimental data and numerical results. The influence of wheel-drop height and the loading cross section location on the stresses distributions were investigated. The results indicated that experimental and numerical data are very close and that the two methods can be validated and be complemented each other. The peak stress distribution of track structure along lateral direction has a hump-shape in general, and the maximum stresses in different layers are all located in the sites where the loading section crosses the longitudinal section through the rail. The stress distribution along longitudinal direction submits to normal one overall. The peak stresses of the self-compacting concrete layer rebound remarkably at the region beneath slab ends. The peak stress of the subgrade between the width ranges of concrete base fluctuates slightly, while it attenuates rapidly out of the range. The distribution of subgrade stress along the longitudinal direction presents a normal curve. The attenuation gradient of subgrade along the depth direction decreases with the increment of depth. The peak stress of subgrade bed decreases linearly or piecewise linearly along depth direction, while it shrinks very slowly in embankment. The peak stresses of track and subgrade increase linearly with the increase of the height of the wheel-drop, while the height has almost no influence on the stress distribution. When the loading section is located in the end of track slab, the peak stresses of track and subgrade in different layers are all greater than those when the loading section moves to the middle of track. However, loading section position has little effect on distributions of the peak stresses.关键词
无砟轨道/路基/动应力/落轴试验/实尺模型/数值分析Key words
ballastless track/subgrade/dynamic stress/wheel-drop test/full-scale model/numerical analysis分类
交通工程引用本文复制引用
裴承杰,宋小林,吕天航..CRTSⅢ型无砟轨道基础结构冲击试验与数值分析[J].铁道科学与工程学报,2017,14(3):425-436,12.基金项目
国家重点基础研究发展规划(973计划)项目(2013CB036204) （973计划）
国家自然科学基金资助项目(51478397, 51008254) （51478397, 51008254）
牵引动力国家重点实验室自主课题(2016TPL-T07) （2016TPL-T07）
