Research purposes: The coal particles dropped from the coal train were immersed in the ballast bed, which changed the composition and working performance of the ballast bed, and caused great trouble to the railway department. In order to study the impact of coal particle immersion on the performance of the ballast bed, this paper conducted large-scale tri-axial tests and large-scale direct shear tests on the ballast particles to verify the feasibility of the selected parameters and simulation methods of the model; On the basis of this, a more accurate method was used to carry out the discrete element multi-scale study of the ballasted track structure of the Datong-Qinhuangdao Railway, and the working performance of the clean and dirty track bed under initial and loading conditions was simulated and analyzed.
Research conclusions: (1) As the degree of contamination of the ballast bed increases, the ability of ballast particles to resist external forces decreases, while the load relatively increases, which increases the risk of performance failure of the ballast bed; (2) Along the transverse position, the force of the track bed under the rail is greatest; (3) The simulation process and conclusions prove the feasibility of the simulation method, and the method can be used in the study of the discrete element of ballasted bed.
Key words
heavy-haul railway /
track structure /
coal particles /
multi-scale /
discrete element
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References
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