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Discrete element method analysis of lateral resistance of fouled ballast bed 被引量:3

Discrete element method analysis of lateral resistance of fouled ballast bed
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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.
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)
出处 《Journal of Central South University》 SCIE EI CAS CSCD 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
关键词 discrete element modelling three-dimensional vision reconstruction BALLAST lateral resistance of sleeper ballast fouling 道床横向阻力 离散元法 污染 铁路轨道 横向电阻 镇流器 形状信息 三维视觉
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