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| Analysis of Ballast Dynamic Behavior with Three-dmiensional Discrete Element Method |
| XIAO Hong, GAO Liang, HOU Bo-wen |
| Beijing Jiaotong university, Beijing 100044, China |
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Abstract Research purposes: Railway ballastbed is a typical granular structure, thus with special focuson the distinct behavior of railway ballast, as patial coupling sleeper-ballast model is established using the discrete element method. The researches are done on the railway ballast vibration behavior and the dynamic response of ballast granule through loading the dynamic time domain spectroscopy of high -speed train.
Research conclusions: Through establishing the model and calculation, the model validation isverified by comparing the calculation results with the test results. Based on i,t the analysis of the dynamic characteristics of railway ballast is made. The results show that the contact force between ballasts transfers as nearly 45b, and there exists a vibration superposition effect within the ballast under neighboring sleepers for the ballast vibration acceleration and ballastcontact force. The ballast vibration acceleration, the dynamic displacement and the contact force are reduced as the depth of the ballastbed increases.
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Received: 07 April 2009
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2009, Vol. 26 
