DEM simulation of ballast degradation and breakage under cyclic loading

作者：Jing Guoqing^*; Feng Kun; Gao Liang; Wang Jun

来源：Journal of Southwest Jiaotong University, 2012, 47(2): 187-191.

DOI：10.3969/j.issn.0258-2724.2012.02.003

• Ballast-sleeper interaction
• Contact forces
• Cyclic loadings
• DEM Simulation
• Major factors
• Micro mechanisms
• Model-based OPC
• Particle crushing
• Research results

In order to reflect the micro-mechanism of ballast-sleeper interaction and the process of ballast breakage, a 3-D ballast-sleeper model based on the discrete element method (DEM) was established, and ballast degradation and breakage under cyclic loading were simulated. In this model, irregular ballast particles are modeled by clusters, they are divided into two kinds, i.e., unbreakable and breakable, and ballast is respectively subjected to monotonic and cyclic loads. The research results show that under the same load, contact force between ballast and sleeper is larger when the ballast is loaded than that when it is unloaded. The crushed clusters mainly appear underneath the sleeper, particle crushing is a major factor for sleeper settlement, and the sleeper settlement increases when ballast strength reduces.

• 出版日期2012
• 单位北京交通大学