基于动力分析的CRTSⅢ板式无砟轨道路基冻胀控制标准研究  

Research on Division Standard of Subgrade Frost Heaving for CRTS Ⅲ Slab Track Based on Dynamic Analysis

作　　者：杨国涛[1] 高亮[1] 刘秀波 赵闻强 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]中国铁道科学研究院基础设施检测研究所,北京100081

出　　处：《铁道学报》2017年第10期110-117,共8页Journal of the China Railway Society

基　　金：国家自然科学基金(51578053;51578056);中国铁路总公司科技研究开发计划(2015G001-L);北京交通大学基本科研业务费(2015JBZ004)

摘　　要：哈大高速铁路的冬季运营经验表明,严寒地区高速铁路路基冻胀问题比较普遍。路基冻胀引起的轨道静、动态不平顺影响高速列车运行平稳性,有必要制定高速铁路路基冻胀控制标准。本文应用有限元方法建立车辆-轨道-路基冻胀分析模型,分析路基冻胀作用下CRTSⅢ型板式无砟轨道变形规律及车辆-轨道结构的动力响应特征。计算结果表明:冻胀主要影响列车垂向动力学性能;随着冻胀量的增加,车辆运营平稳性明显下降,其中波长较短冻胀的影响更剧烈;当冻胀达到10m波长、15mm冻胀量时,底座板动态拉应力超出其抗拉强度。基于动力学分析结果绘制冻胀控制标准临界曲线,对路基不均匀冻胀进行划分。The winter operation experience of Harbin-Dalian High-speed Railway shows that the frost heaving ofhigh-speed railway subgrade in cold region is common. As the static and dynamic track irregularity caused by the subgrade frost heaving affects the stable operation of the high speed trains, it is urgent to establish stan-dard for frost heaving control of subgrade of high speed railway. Based on FEM, a dynamic model of vehicle- track-subgrade frost heaving was built to analyze the deformation law of CRTS HI type slab track and dynamic response of vehicle-track system under frost heave action combined. Results indicate that the subgrade frost heaving mainly affects the vertical dynamic performance of the train. With the increase of frost heave, the ve-hicle running stability decreased obviously. The effect of the frost heave is more severe when the wavelength is shorter. For the frost heave with 10 m wavelength and 15 mm amount of frost heaving, the dynamic tensile stress of the base plate exceeds its tensile strength. Combining with the results of dynamic analysis, different critical curves of the frost heaving controlling standard were drawn to give a division standard of subgrade une-ven frost heaving development.

关 键 词：无砟轨道 路基冻胀 离缝 动力学 控制标准 

分 类 号：U213.14[交通运输工程—道路与铁道工程]