Discrete element method analysis of lateral resistance of fouled ballast bed  

作　　者：XU Yang 徐旸;高亮;张艳荣;尹辉;蔡小培(School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China Key Laboratory of Rail Track Engineering of Beijing, Beijing 100044, China State Key Laboratory of Rail Traffic Control and Safety, Beijing 100044, China School of Computer and Information Technology, Beijing Jiaotong University, Beijing 100044, China)

机构地区：[1]School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China [2]Key Laboratory of Rail Track Engineering of Beijing, Beijing 100044, China [3]State Key Laboratory of Rail Traffic Control and Safety, Beijing 100044, China [4]School of Computer and Information Technology, Beijing Jiaotong University, Beijing 100044, China

出　　处：《Journal of Central South University》2016年第9期2373-2381,共9页中南大学学报（英文版）

基　　金：Projects(U1234211,61472029,51208034)supported by the National Natural Science Foundation of China

摘　　要：The lateral resistance of sleeper plays an important role in ensuring the stability of a railway track, which may change in the operation of railway, due to the fouling in the ballast bed. In this work, discrete element method was adopted to investigate the effect of fouling on the lateral resistance of sleeper. The shape information of ballast was captured by method of three-dimensional vision reconstruction. In order to calibrate the mechanical parameters and verify the models, a lateral resistance field test was carried out by using a custom-made device. The contact force distributions in the different parts of sleeper as well as the interaction between ballast and sleeper were discussed in depth. The results show that fouling of ballast bed evidently reduces the lateral resistance of sleeper and the decreasing degree is also related to the fouled position of ballast bed, in the order of shoulder > bottom > side.Therefore, the effect of fouling, especially the fouling in the ballast shoulder, on the lateral resistance of sleeper, should be taken into account in ballast track maintenance work.The lateral resistance of sleeper plays an important role in ensuring the stability of a railway track, which may change in the operation of railway, due to the fouling in the ballast bed. In this work, discrete element method was adopted to investigate the effect of fouling on the lateral resistance of sleeper. The shape information of ballast was captured by method of three-dimensional vision reconstruction. In order to calibrate the mechanical parameters and verify the models, a lateral resistance field test was carried out by using a custom-made device. The contact force distributions in the different parts of sleeper as well as the interaction between ballast and sleeper were discussed in depth. The results show that fouling of ballast bed evidently reduces the lateral resistance of sleeper and the decreasing degree is also related to the fouled position of ballast bed, in the order of shoulder 〉 bottom 〉 side. Therefore, the effect of fouling, especially the fouling in the ballast shoulder, on the lateral resistance of sleeper, should be taken into account in ballast track maintenance work.

关 键 词：discrete element modelling three-dimensional vision reconstruction BALLAST lateral resistance of sleeper ballast fouling 

分 类 号：U213.7[交通运输工程—道路与铁道工程]