Structural analysis and parametric study ballasted track in sandy regions

Xiao, H.; Zhang, Zhihai; Chi, Yihao; Wang, Xiaoyu; Wang, Haoyu; Jiang, Ziqing

doi:10.1016/j.conbuildmat.2022.127439

Cited by 10 publications

(1 citation statement)

References 39 publications

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“…In the past, scholarly research has focused mostly on the aerodynamic performance of trains running on ballasted tracks. Xiao [1] and García et al [2] studied the influence of the ballasted track on the flow field characteristics under the train. Ding [3] studied the flow field characteristics on the surface of the ballast bed, the flow characteristics under the train, the aerodynamic characteristics of ballast particles, and the influence of the ballast bed structure on the flying ballast, using the wind tunnel test and CFD method.…”

Section: Introductionmentioning

confidence: 99%

Influence of Structural Types of CRTS I Plate-Type Ballastless Track on Aerodynamic Characteristics of High-Speed Train

Bian

Zhang

2022

Urban Rail Transit

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In order to improve the running quality of trains on a ballastless track, the influence of the CRTS I ballastless track with different structures (flat-type and frame-type tracks) is investigated with respect to the aerodynamic characteristics of high-speed trains. In the present paper, the aerodynamic force changes on the head, middle, tail, and whole car of the high-speed train were studied under two conditions, with crosswind and without crosswind, and the influence of different crosswind speeds (10, 15, 20, 25, 30 m/s) on the aerodynamic force of the train was analyzed. The pressure and flow field distribution characteristics were also studied, and the reasons for the different aerodynamic characteristics of different track structures and trains running in different wind environments were analyzed, respectively. The results indicate that the ballastless track structure obviously influences the aerodynamic characteristics of the high-speed train. When there is no natural wind, compared with the flat track, the frame track reduces the drag and lateral forces of the train but increases the lift force. The frame track causes the drag force of the whole vehicle to decrease slightly (the maximum ratio is 2.15%), the lift force increases significantly (the maximum ratio is 12.55%), and the lateral force obviously decreases (the maximum ratio is 52.43%). The lift and lateral forces of the middle car are most affected, which is because the frame structure changes the vortex motion state of the middle car. Compared with the flat track, the drag force of each car on the frame track is reduced under the crosswind; the lift force of each car is increased, and the maximum increase in the lift force of the head, middle, and tail cars is 5.60%, 2.55%, and 3.63%, respectively; the lateral force of the tail car increases greatly at a wind speed of 15 m/s, reaching 6.84%. Due to the existence of the frame structure, the space under the vehicle increases, resulting in a decrease in the airflow rate and an increase in local pressure, which leads to changes in the train’s aerodynamic force. Meanwhile, the train’s aerodynamic change under the crosswind is smaller than that when there is no wind.

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Section: Introductionmentioning

confidence: 99%

Influence of Structural Types of CRTS I Plate-Type Ballastless Track on Aerodynamic Characteristics of High-Speed Train

Bian

Zhang

2022

Urban Rail Transit

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Analysis of mesoscopic mechanical dynamic characteristics of ballast bed with under sleeper pads

Yang,

Yu,

Wang

et al. 2023

Rail. Eng. Science

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The meso-dynamical behaviour of a high-speed rail ballast bed with under sleeper pads (USPs) was studied. The geometrically irregular refined discrete element model of the ballast particles was constructed using 3D scanning techniques, and the 3D dynamic model of the rail–sleeper–ballast bed was constructed using the coupled discrete element method–multi-flexible-body dynamics (DEM–MFBD) approach. We analyse the meso-mechanical dynamics of the ballast bed with USPs under dynamic load on a train and verify the correctness of the model in laboratory tests. It is shown that the deformation of the USPs increases the contact area between the sleeper and the ballast particles, and subsequently the number of contacts between them. As the depth of the granular ballast bed increases, the contact area becomes larger, and the contact force between the ballast particles gradually decreases. Under the action of the elastic USPs, the contact forces between ballast particles are reduced and the overall vibration level of the ballast bed can be reduced. The settlement of the granular ballast bed occurs mainly at the shallow position of the sleeper bottom, and the installation of the elastic USPs can be effective in reducing the stress on the ballast particles and the settlement of the ballast bed.

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Research on the mechanism of railway ballast shear performance under various sand contents and load conditions

Chi,

Xiao,

Cui

et al. 2024

Comp. Part. Mech.

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Structural analysis and parametric study ballasted track in sandy regions

Cited by 10 publications

References 39 publications

Influence of Structural Types of CRTS I Plate-Type Ballastless Track on Aerodynamic Characteristics of High-Speed Train

Influence of Structural Types of CRTS I Plate-Type Ballastless Track on Aerodynamic Characteristics of High-Speed Train

Analysis of mesoscopic mechanical dynamic characteristics of ballast bed with under sleeper pads

Research on the mechanism of railway ballast shear performance under various sand contents and load conditions

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