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Discrete element method of improved performance of railway ballast bed using elastic sleeper

Journal of Central South University 2015年第8期22卷 3223-3231页

作者：高亮罗奇徐旸井国庆蒋函珂 School of Civil Engineering Beijing Jiaotong University Beijing Key Laboratory for Railway Track Engineering (Beijing Jiaotong University)

With the development of high-speed and heavy-haul railway in China, problems like insufficient thickness of ballast bed and overlarge track stiffness are obvious. Ballast may break into small particles and their contact status will deteriorate under cyclic loading, resulting in ballast degradation. Discrete element method(DEM) was used to research improved performance of ballast bed using elastic sleeper. Clusters were generated by bonding spheres to model real ballasts, while broken bonds were utilized to distinguish breakage. Two kinds of ballast beds with elastic sleeper and conventional sleeper were established, respectively. After applying cyclic loading to the models, differences of mechanical properties between two models were analyzed by contrasting their dynamic behavior indexes, such as particle contact force, sleeper settlement, vibration velocity and acceleration, breakage characteristic. The results illustrate that compared with conventional sleeper, elastic sleeper increases sleeper settlement, while reduces ballast vibration and contact force between particles, which could depress ballast breakage.

关键词： railway ballast bed discrete element method elastic sleeper breakage mechanical property

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Dynamic Response of elastic sleeper Ballasted Track on Bridge

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Journal of Southwest Jiaotong University(English Edition) 2010年第2期18卷 124-128页

作者：翟淼王平李培刚陈小平 School of Civil Engineering Southwest Jiaotong University

A vehicle-track-bridge coupling dynamics model was built based on the theory of vehicle-track coupling dynamics. Using this model, a comparison was made between the dynamic response of an elastic sleeper ballasted track and a common sleeper ballasted track on bridge under the same working conditions. The results show that laying elastic sleepers on the bridge could solve the problem of large track stiffness caused by a thin ballast thickness, and improve the dynamic response of the bridge. This is beneficial to train operation safety and riding comfort.

关键词： elastic sleeper Ballasted track Coupling dynamics Dynamic response Bridge

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