自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

您目前所在的位置:首页 - 期刊简介 - 详细页面

中南大学学报(自然科学版)

Journal of Central South University

第51卷    第2期    总第306期    2020年2月

[PDF全文下载]    [Flash在线阅读]

    

文章编号:1672-7207(2020)02-0551-09
脏污对有砟道床动力特性影响的离散元分析
崔旭浩,肖宏,肖慧娟

(北京交通大学 轨道工程北京市重点实验室,北京,100044)

摘 要: 为分析脏污对有砟道床动力特性的影响,建立有砟道床及脏污颗粒的离散元分析模型,研究有砟道床在脏污条件下的动力响应,并探讨脏污程度对有砟道床动力行为的影响。研究结果表明:脏污会增大列车荷载在有砟道床中的扰动范围并提高道床振动水平,道砟颗粒的振动加速度和速度基本上随着脏污程度的提高而呈线性增大;脏污会增大道砟颗粒的受力,增加道床中所受应力较大的道砟颗粒的数量;脏污颗粒会改变道砟颗粒之间的接触状态,降低道砟颗粒之间的咬合及摩擦作用,并增大有砟道床在列车荷载下产生的弹性变形及塑性变形,不利于道床稳定,易使道床产生不均匀沉降。

 

关键字: 有砟道床;道床脏污;离散元法;动力响应;力学特性

DEM analysis of effect of ballast fouling on dynamic characteristic of ballast bed
CUI Xuhao, XIAO Hong, XIAO Huijuan

Beijing Key Laboratory of Track Engineering, Beijing Jiaotong University, Beijing 100044, China

Abstract:The DEM(discrete element method) models of ballast bed and fouling particles were established to analyze the effect of fouling on the dynamic characteristics of ballast bed. The dynamic responses of fouling ballast bed and the influence of the fouling degree on the dynamic behaviors of the ballast bed were analyzed. The results show that the disturbance range of train load in the ballast bed is expanded and the vibration of ballast bed increases due to the fouling of ballast bed. The vibration acceleration and velocity of the ballast particles increase linearly with the increase of fouling levels. The stress of ballast particles and the number of ballast particles with higher stress increase because of the fouling. The contact states between ballast particles are changed, and the occlusion and friction between the ballast particles are reduced by the fouling particles. The elastic deformation and plastic deformation of the ballast bed under train load are increased, which is detrimental to the stability of the ballast bed and causes uneven settlement of the ballast bed easily.

 

Key words: ballast bed; ballast fouling; discrete element method; dynamic response; mechanical property

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
版权所有:《中南大学学报(自然科学版、英文版)》编辑部
地 址:湖南省长沙市中南大学 邮编: 410083
电 话: 0731-88879765(中) 88836963(英) 传真: 0731-88877727
电子邮箱:zngdxb@csu.edu.cn 湘ICP备09001153号