Ⅲ型轨枕有砟轨道动刚度特性研究  

Research on Dynamic Stiffness Characteristics of Ballast Track with Ⅲ-type Sleepers

作　　者：亓伟[1] 李成辉[1] 郑建[1] 刘玉涛[1] QI Wei LI Chenghui ZHENG Jian LIU Yutao(Key Laboratory of High-speed Railway Engineering,Ministry of Education,Southwest Jiaotong University Chengdu Sichuan 610031, China)

机构地区：[1]西南交通大学高速铁路线路工程教育部重点实验室,四川成都610031

出　　处：《铁道建筑》2016年第12期90-93,共4页Railway Engineering

基　　金：国家自然科学基金高速铁路基础研究联合基金(U1334203;U1234201)

摘　　要：轨道动刚度是反映轨道动力特性的重要参数。本文通过建立Ⅲ型轨枕有轨道力学模型,研究扣件刚度、扣件阻尼、道床刚度等轨道结构参数的变化与轨道动刚度的关系。结果表明:增加扣件刚度会增大轨道第1反共振频率、第2共振频率及轨道动刚度的波动幅值,会增加低频范围内的轨道动刚度,而降低中、高频范围内的轨道动刚度;增大扣件阻尼会削减轨道动刚度的波动幅值,当扣件阻尼为75 k N·m/s时,在中、高频范围内,轨道动刚度波动幅值很大程度上会被削减;道床刚度的增大使得轨道第1共振频率、第1反共振频率增大,轨道动刚度波动幅值减小;通过降低扣件刚度、增加扣件阻尼、增加道床刚度等措施可以有效减小轨道共振,从而实现有砟轨道的动平顺性。Dynamic stiffness is an important parameter reflected the dynamic characteristics of track.The relationships between track dynamic stiffness and some parameters of track structure,including fastening stiffness,fastening damping,ballast bed stiffness were analyzed by building ballast track model with Ⅲ-type sleeper in this paper.The results showthat with the increase of fastening stiffness,the frequencies of the first anti-resonance,the second resonance and the fluctuation amplitude of track dynamic stiffness increase,while the track dynamic stiffness increases in lowfrequency and decreases in middle and high frequency.With the increase of the fastening damping,the amplitude of track dynamic stiffness decreases.When the fastening damping is 75 k N·m/s,the fluctuation amplitudes of track dynamic stiffness in middle frequency and high frequency are greatly reduced.The increase of ballast bed stiffness causes the frequencies of first resonance and anti-resonance increase,meanwhile,causes the amplitude of track dynamic stiffness decrease in lowfrequency.The track resonance can be efficiently decreased by decreasing fastening stiffness and increasing fastening damping and ballast bed stiffness,which can be realized the comfortability requirements of dynamic geometry on ballast track.

关 键 词：高速铁路 有砟轨道 动刚度 轨道参数 激振频率 

分 类 号：U211.3[交通运输工程—道路与铁道工程]