铁道科学与工程学报Issue(4)：724-730,7.
高速铁路路基不均匀沉降对 CRTS III 板式轨道受力变形的影响
Effect of uneven subgrade settle ment on the CRTS III slab track stress and deformation of high -speed railway
摘要
Abstract
A spatial coupled dynamic model of CRTS III slab track system on the soil subgrade was established based on the finite element method.The stress and deformation characteristics of the slab track under the influ-ence of subgrade settlement were studied,and the variations of the contact stress and cavity area between the supporting layer and the subgrade surface were analyzed when the uneven settlement occurs.Results indicate that:the layers of non -ballast track structure deform accordingly with the subgrade settlement under gravity. The stresses of the track slab,self -compacting concrete layer and supporting layer are affected comprehensively by the wavelength and amplitude of the subgrade settlement.The slab stress would increase when the amplitude of the subgrade settlement rises,and the subgrade settlement with wavelength between 20 ~30 m has a greater influence on the slab stress.An increase in the subgrade settlement amplitude would lead to larger cavity areas and contact stresses between the supporting layer and the surface of subgrade.Meanwhile the cavity areas and contact stresses show a trend of first increasing and then decreasing as the wavelength increases.It can be seen that the uneven subgrade settlement has a significant influence on the track stress and deformation,even causes track layer gaps,all of which will worsen the riding comfort and running safety of the vehicle.Therefore it is nec-essary to take a good control of the uneven subgrade settlement.关键词
CRTS III 板式无砟轨道/路基不均匀沉降/轨道变形/应力特性Key words
CRTS III slab track/uneven subgrade settlement/track deformation/stress characteristic分类
交通工程引用本文复制引用
肖威,郭宇,高建敏,翟婉明..高速铁路路基不均匀沉降对 CRTS III 板式轨道受力变形的影响[J].铁道科学与工程学报,2015,(4):724-730,7.基金项目
国家重点基础研究发展计划（973计划）项目（2013CB036205，2013CB036206）；中国铁路总公司开发计划项目（2014G001－G）；国家自然科学基金资助项目 （）
