Discrete Element Modelling of Rubber-Protected Ballast Performance Subjected to Direct Shear Test and Cyclic Loading

Guo, Yunlong; Ji, Yameng; Zhou, Qiang; Markine, Valéri; Jing, Guoqing

doi:10.3390/su12072836

Cited by 23 publications

(8 citation statements)

References 51 publications

(59 reference statements)

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“…In accordance with conducted research by Sol-Sánchez et al, Coating aggregates with crumb rubber smaller than 0.5 mm reduced long-term settlement and damping [2]. The study of the shear properties of these materials by Guo et al has shown that the use of ballast with rubber coating decreased the shear strength and stiffness of the track, but the use of 0-0.025 mm rubber particles caused less reduction in these two parameters [3] In the literature, the effect of rubber coating on ballast life has not been considered. Therefore, in this study, after selecting the best method for creating rubber coating on ballast aggregates, the effect of using this material on increasing the lifespan of materials was studied by performing Los Angeles and Micro-Daval experiments.…”

supporting

confidence: 80%

Laboratory investigation of the effect of rubber coating on stone ballast life

Esmaeili¹,

Namaei²

Civil-Comp Conferences

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So far, many studies have been conducted to improve the degradation behavior of ballasted tracks by using waste tires mixed with ballast. However, coating stone ballast materials with rubber particles, which has been proposed in recent years, has received less attention in the literature. In this paper, a laboratory investigation on the effect of rubber coating on ballast life was carried out. For this purpose, the optimal coating method with a focus on selecting the appropriate percentage of rubber particles mixed with adhesive was presented in the first stage. Then, by applying the selected coating, its effect on the abrasive behavior of ballast taken from a quarry in Tehran city was investigated through Los Angeles and Micro-Deval tests. In the next step, breakage and settlement of the ballast with and without rubber coating were evaluated by performing ballast box test by applying 100,000 loading cycles with an amplitude of 15 kN and frequency of 3 Hz. The results confirm that the application of rubber coating has led to a reduction in the Los Angeles and Micro-Deval coefficients by 66.15% and 93.18%, respectively, and increasing settlement and decreasing breakage under cyclic loading by 24.17% and 88.32%, respectively. In general, according to the Canadian Pacific Rail Code, the use of this technology can enhance the average ballast life by almost 91%.

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supporting

confidence: 80%

Laboratory investigation of the effect of rubber coating on stone ballast life

Esmaeili¹,

Namaei²

Civil-Comp Conferences

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“…Gravel is connected to the two particles and is randomly located in a defined space. Subsequently, the work of stabilizing the gravel layer is simulated by loading a cycling rod onto a sleeper located at the top 3 . Gravel shapes are formed by combining randomly generated discrete elements using the Delaunay triangulation function.…”

Section: Introductionmentioning

confidence: 99%

Simplified DEM-based Modelling and Simulation of the Track ballast

Lee,

Song,

Lim

et al. 2023

Preprint

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This study proposes a rational method for modelling ballast in tracks based on the Discrete Element Method (DEM) approach. To simulate a ballast consisting of a group of gravels, it is effective to use the discrete element method. The ballast comprises randomly arranged gravels of unspecified shapes, and requires multiple steps and a separate house code for implementing the ballast. In this study, a simplified ballast analysis model using the Parallel Bond Method (PBM) is proposed and verified through comparison with design standards. Additionally, case studies are conducted to investigate the effect of particle size distribution and micromechanical parameters on the simulation results.

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“…In addition, Suhr et al 20 and Vizcarra et al 21 also studied the compression performance, direct-shear performance and triaxial-shear performance of railway ballast by combining the physical tests with the DEM simulations. Guo et al 22 used the DEM to simulate the direct-shear performance of the mixture of ballast and rubber. The simulation results could be well matched with the test results in the laboratory, which verified the correctness of the parameters in the DEM modeling.…”

Section: Introductionmentioning

confidence: 99%

“…Guo et al. 22 used the DEM to simulate the direct-shear performance of the mixture of ballast and rubber. The simulation results could be well matched with the test results in the laboratory, which verified the correctness of the parameters in the DEM modeling.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigations of the effect of temperature and moisture on the repose angle of railway ballast

Liu

Wang

Liu

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part F:

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The angle of repose (AOR) is one of the key parameters used to comprehensively characterize the basic mechanical properties and stacking properties of granular materials. In this research, the influence of temperature and moisture on the stacking performance of railway ballast was studied through tests of the AOR. Additionally, the parameters of the discrete element method (DEM) for ballast beds with various temperatures and moisture levels were calibrated and combined with the response surface method. Then, the AORs of the ballast in different environments were simulated with the DEM, and the micromechanical properties of the ballast in dry, wet, low-temperature, and frozen environments were compared. The results showed that the AOR of the ballast in a frozen environment was smaller than that in a dry environment at the same low temperature (the difference could reach 8.48° at −30°C). The AOR of the ballast increased with the decrease of the temperature in a dry environment (18.44% increase between 20°C and −30°C). The AOR of the ballast decreased with the decrease of the temperature in a wet (frozen) environment (22.86% decrease between 20°C and −30°C). In addition, the validity tests of the AOR simulations of ballast proved that the obtained parameters could be used in the DEM models of ballast for the corresponding temperature and moisture. At the same time, it was found that with the change of temperature and moisture, the force chain network of the ballast would also change.

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Discrete Element Modelling of Rubber-Protected Ballast Performance Subjected to Direct Shear Test and Cyclic Loading

Cited by 23 publications

References 51 publications

Laboratory investigation of the effect of rubber coating on stone ballast life

Laboratory investigation of the effect of rubber coating on stone ballast life

Simplified DEM-based Modelling and Simulation of the Track ballast

Numerical and experimental investigations of the effect of temperature and moisture on the repose angle of railway ballast

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