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Abstract: Discrete element simulation on ballasted beds is an important method to study the service characteristics of ballasted track%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>ballasted tracks; an effective simulation should be based on proper ballast parameters. ballast contact parameter, which exhibits a high discreteness affected by factors such as material, shape, and gradation, can effectively be calibrated by an angle of repose test. Based on the testing principles of a multi-parameter response surface method, the Box–Behnken method is adopted to design the angle of repose test under the influence of restitution, static friction, and rolling friction coefficients; laboratory-measured results are combined with the simulation; regression analyzed angle of repose is considered as the goal; parameters optimization and ballasted bed resistance simulations are verified for multiple parameters. The results demonstrate that Chinese special-grade ballasts exhibit an average laboratory-measured angle of repose of (39.78±1.27)°, and the optimal combination of parameters in this discrete element simulation based on the response surface method are as follows: the restitution coefficient is 0.72, the static friction coefficient is 0.56, and the rolling friction coefficient is 0.27. The results of the lateral resistance simulation are in accordance with the laboratory test, indicating that the optimal parameters are usable. The multi-parameter response surface method effectively helps calibrate the parameters of the discrete element simulation on ballasted beds.

The manuscript presents a study on the use of discrete element method (DEM) to study the angle of repose of the special-grade ballast. A discrete element model is developed to examine the lateral resistance forces of the ballast aggregates and sleepers. Regression analysis approach is used to analyse results and the predicted DEM results are also comparable with field measurements. I find this study is interesting and will be useful for readership.

基于响应面法的碎石道床离散元模型参数研究

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