高速重载有砟轨道路基动变形特性的数值分析  

Numerical Analysis for the Dynamic Deformation Characteristics of the Ballast Subgrade on High-Speed and Heavy Haul Railway

作　　者：董亮[1,2] 张千里[1,2] 蔡德钩[1,2] 程爱君[1,2] 叶阳升[1,2] 

机构地区：[1]中国铁道科学研究院高速铁路轨道技术国家重点实验室,北京100081 [2]中国铁道科学研究院铁道建筑研究所,北京100081

出　　处：《中国铁道科学》2010年第2期6-11,共6页China Railway Science

基　　金：中国铁道科学研究院行业服务技术创新项目(2008YJ13)

摘　　要：运用ABAQUS有限元软件建立有砟轨道—路基系统三维动态有限元模型,分析高速和重载列车荷载作用下的路基空间动应力、路基面横纵向动变形和剪应变特性。基于现场条件,选择砟脚内30cm和砟脚处作为路肩横向和纵向的动变形分析参考点,研究动变形引起的路肩倾斜角度随列车速度、道砟厚度、表层厚度和表层模量变化的规律。结果表明,路肩横向和纵向倾斜角随车速增大而增大,随道砟厚度、基床表层厚度和表层模量的增大而减小,基床表层和底层的最大剪应变较为接近,最大剪应变与路肩最大倾角大致呈线性关系。With ABAQUS FE software, 3D FE dynamic models of the ballast track-subgrade system were developed to analyze the spatial dynamic stress of the subgrade, the lateral and longitudinal dynamic deformation of the subgrade surface and the shear strain under the loads of high-speed and heavy haul trains. Based on field condition, the reference points for analyzing the lateral and longitudinal dynamic deformation of the road shoulder were chosen at 30 cm inward from the ballast slope angle and at the ballast slope angle, respectively. The change law of the road shoulder inclination, which resulted from the dynamic deformation, along with the train speed, ballast thickness, surface bedding thickness and the modulus of bedding surface was studied. The results show that the lateral and longitudinal inclination angles increase with the increase of the train speed while decrease with the increase of the ballast thickness, the thickness and the modulus of the bedding surface. The maximal shear strain of the bedding surface is close to that of the bedding bottom, and the linear relationship between the maximal shear strain and maximal slope angle of the road shoulder is obtained.

关 键 词：有砟轨道 路基动变形 路肩倾斜角 剪应变 高速铁路 重载铁路 

分 类 号：U213.1[交通运输工程—道路与铁道工程]