路基刚度不均匀对无砟轨道动力特性影响研究  

Study on influence of uneven subgrade's stiffness on dynamic performance of ballastless track

作　　者：张家玲[1] 徐光辉[1] 蔡英[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《铁道建筑》2014年第5期135-138,共4页Railway Engineering

基　　金：国家自然科学基金项目资助(51178405)

摘　　要：为了分析路基刚度不均匀对无砟轨道结构动力特性的影响,采用层状体系理论,应用ABAQUS有限元软件,建立无砟轨道—路基多层体系动力学模型。模型荷载考虑自重荷载和移动车轮荷载,路基刚度不均匀部位的性状采用不同的面积和刚度进行模拟,分析了路基各种不均匀性状对无砟轨道结构动位移和动应力的影响。计算结果表明:轨道结构的动位移随着路基刚度不均匀部位面积的增大而增大,随不均匀部位刚度值的减小而增大;基床底层刚度对轨道结构的动力特性影响也很大,据此提出了路基刚度不均匀面积及不均匀程度的限值,为路基施工质量检验和控制提供理论依据。The paper intends to analyze the influence stiffness irregularity of the subgrade has on the dynamic performance of the ballastless track. For this purpose,the paper with the help of the ABAQUS finite-element software adopts the layering architecture theory and builds the dynamics model for the ballastless track and the multi-layer subgrade system. Both self weight and rolling wheels are considered in the account of the loading in the model. The irregularity in the subgrade is simulated via different size and stiffness,so as to identify the relation between such irregularity and the dynamic displacement of the track,as well as its dynamic stress. The results indicate that the dynamic displacement of the track goes up as the size of the irregularity increases;while the same pattern can be observed as the stiffness of such irregularity drops. Also,it is noticed that the stiffness of the subgrade bed largely affects the dynamic performance of the track. Based on the findings mentioned above,the limit values for the size and degree of such irregularity can be concluded,which provide theoretical foundation for the quality supervision and control of subgrade projects.

关 键 词：路基 无砟轨道 有限元模型 刚度不均匀 动位移 

分 类 号：U213.1[交通运输工程—道路与铁道工程]