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350 km/h高速铁路有砟轨道基床结构的技术条件分析
田地1,2, 罗强1,2, 谢宏伟1,2
1.西南交通大学 土木工程学院;2.高速铁路线路工程教育部重点实验室, 成都 610031
摘要:
采用车辆轨道路基垂向耦合动力学模型,研究了轨道高低不平顺下有砟轨道路基动力影响系数φi的概率分布特性;根据循环荷载下路基粗粒土典型填料单元模型试验反映出的累积变形状态特征与荷载水平的关系,明确了基床以下填料处于无时间效应变形状态、基床填料处于微弱时间效应变形状态的设计工作状态;以基床结构的动强度、长期动力稳定性、循环变形为设计控制指标,开展了高速铁路有砟轨道基床结构的技术条件分析。研究表明:表征路基承受列车动力效应程度的φi沿线路纵向服从对数正态分布;列车荷载作用下,路基各结构层的累积变形状态与填料性质密切相关;基床结构的长期动力稳定性为设计主控因素,据此,提出了适用于350 km/h有砟轨道高铁基床双层结构型式的技术标准建议。
关键词:  高速铁路  有砟轨道路基  荷载概率特征  填料累积变形状态  基床结构设计
DOI:10.11835/j.issn.2096-6717.2019.090
分类号:U213.1
基金项目:国家自然科学基金(51878560)
Analysis of technical conditions for subgrade of 350 km/h high-speed railway of ballast track
Tian Di1,2, Luo Qiang1,2, Xie Hongwe1,2
1.School of Civil Engineering;2.MOE Key Laboratory of High Speed Railway Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China
Abstract:
A vehicle-track-subgrade coupling dynamics vertical model was applied to study the probability distribution characteristics of dynamic influence coefficients φi of ballast track subgrade with vertical profile irregularity. According to the relationship between cumulative deformation state characteristics and loading levels revealed by model test of typical coarse-grained soil filler of subgrade under cyclic loading, it is found that the embankment below subgrade is in a time-independent deformation state, and subgrade filler is in weak-time effect state. Using the dynamic strength of subgrade structure, long-term dynamic stability and cyclic deformation as design control indicators, the technical conditions of the high-speed railway ballast track subgrade structure were analyzed. The study shows that:lg φi which characterize the degree of subgrade bearing the dynamic effect of the train along the line longitudinal direction, obeys the normal distribution; the cumulative deformation state of each structural layer of the subgrade under train load is closely related to the nature of the filler; the subgrade structure's long-term dynamic stability is the main design control factor. Accordingly the technical standards for 350km/h high-speed rail double-layer subgrade structure of ballast track was proposed.
Key words:  high-speed railway  ballast track subgrade  load probability characteristics  accumulative deformation states of fillers  subgrade design
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