期刊
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
卷 195, 期 19-22, 页码 2841-2859出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cma.2005.07.006
关键词
discrete element; cyclic loading; ballasted track; contact detection
Discrete element simulation provides some insight into the alteration of railway ballast after repeated train passings. The present Part I is devoted to a 2D model of this granular layer interposed between the deformable ground and the rail sleeper, to which a large number of loading cycles is applied. Ballast grains are modelled as indeformable polygonal solids. A detailed account of the application to this frictional dynamical problem of the Non-Smooth Contact Dynamics numerical method is given. Validation is obtained through comparison with physical experiments performed on assemblies of prismatic mineral grains. Numerical results on the settlement of a track submitted to 20,000 loading cycles or more are presented. (c) 2005 Elsevier B.V. All rights reserved.
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