DEM analysis of railway track lateral resistance

Khatibi, Fatemeh; Esmaeili, Morteza; Mohammadzadeh, Saeed

doi:10.1016/j.sandf.2017.04.001

Cited by 51 publications

(50 citation statements)

References 11 publications

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“…Recent studies conducted by Lataliza 39 confirmed that the average service life of the steel sleepers in curves and tangents was approximately 17 and 30 years, respectively. By comparing the contribution of ballast components to the lateral resistance of tracks, reported by many researchers, 1,4,11,13,40–43 it can be concluded that the ballast bed and crib ballast play a major role in lateral bearing forces. In another study, Irazábal González 24 indicated that the portion of ballast components to the lateral resistance changes throughout the displacement of the sleeper.…”

Section: The Effect Of Ballast Specifications On the Lateral Resistancementioning

confidence: 93%

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Review of the lateral resistance of ballasted tracks

Jing

Aela

2019

Proceedings of the Institution of Mechanical Engineers, Part F:

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The lateral resistance is one of the main functions of continuously welded rails that are influenced by various factors such as rail temperature, specifications of fastening systems, sleepers, ballast layer, the maintenance process of rails, etc. Nowadays, heavy haul and high-speed railways are operated under extremely complicated conditions, with the structure of the ballasted track and sleeper types also being constantly innovated. Therefore, research on the lateral resistance of ballasted tracks needs further investigation. In this paper, the ballasted track profile, the characteristics of the ballast aggregates, maintenance, and innovative sleepers were investigated and categorized to precisely examine the lateral behaviour of the ballasted tracks. In addition, the changes in the specifications of the abovementioned factors and components were also investigated. It was concluded that the geometry of the ballast layer and the interaction between the ballast and the sleeper are the main factors that led to the higher lateral resistance. In this regard, changes in the shape and type of sleepers as well as the ballast could increase the resistance. The influence of the loading frequency induced by trains and environmental conditions should be considered in further studies.

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Section: The Effect Of Ballast Specifications On the Lateral Resistancementioning

confidence: 93%

“…On the other hand, a series of numerical model tests undertaken by Khatibi et al. 40 indicated that the increase of ballast depth higher than 300 mm decreases the lateral stability of the ballast layer. Therefore, a depth of 300 mm could be defined as the optimum depth of the ballast layer.…”

Section: The Effect Of Ballast Specifications On the Lateral Resistancementioning

confidence: 99%

Review of the lateral resistance of ballasted tracks

Jing

Aela

2019

Proceedings of the Institution of Mechanical Engineers, Part F:

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“…Although more realistic models have been used to the model particle by Khatibi et al. 28 to evaluate the lateral resistance of the sleeper placed in the ballast layer, the use of 2D images of ballast aggregates cannot be a precise method for generating particles in a 3D space.…”

Section: Dem Simulations Of Stptmentioning

confidence: 99%

“…26 While previous research comparing the results of simplified and realistic particle shape models has found a slight change in the vertical displacement of the ballast layer, 27 the impact of irregularly shaped particles on the increase in interparticle friction angle and the consequential increasing in the lateral resistance of the ballast layer is undeniable. So far, little research has been carried out on the simulation of realistic ballast shapes, 28 and there have been no attempts to use 3D aggregate images for the evaluation of angularity and surface texture of 3D particles in STPT simulation.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental analysis of single tie push tests on different shapes of concrete sleepers in ballasted tracks

Jing

Aela

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part F:

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The lateral displacement of sleepers is one of the key issues in railroads, which is caused by different factors such as the geometry of the ballast layer as well as the shape of the sleepers. Several methods have been proposed to improve the lateral resistance of sleepers on ballasted tracks. In this paper, a series of single tie push tests have been carried out to assess the performance of end-winged, middle-winged, and bumped sleepers on ballasted tracks with a variety of shoulder ballast widths and heights. Based on the experimental results, 500 mm and 150 mm were proposed as the optimum shoulder width and height, respectively. In addition, among the abovementioned sleepers, the EW_sleeper shows a significant increase in the total lateral resistance. Discrete element method (DEM) simulations were performed using PFC3D to determine the optimum size of the EW_sleeper wings. It was found that using a pair of wings measuring 14 cm in length and 13 cm in width can increase the lateral resistance compared to other alternatives.

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“…They concluded that the characteristics of real angular ballast particles can be simulated when the number of ballast particles in the simulations is greater than eight. Khatibi et al 6 explored the effect of shoulder height and sleeper type on the lateral resistance of the ballast bed. Le Pen and Powrie 7 studied the effect of the different sleeper bed, sleeper sides, and shoulder resistance in the laboratory.…”

Section: Introductionmentioning

confidence: 99%

Ballast bed resistance characteristics based on discrete-element modeling

Zeng

Song

Wei-dong

et al. 2018

Advances in Mechanical Engineering

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In this study, in situ experiments were conducted to study the changing characteristics of the lateral and longitudinal resistance of a ballast bed, and a three-dimensional model for the ballast bed and sleeper was constructed based on the discrete-element method. The effects of the lateral and longitudinal resistance of the ballast bed, such as gravel ballast grading, sleeper depth, the angle of the shoulder slope, and ballast bed shoulder width, among others, were studied. The results suggest that (1) the lateral and longitudinal resistance of the ballast bed increases with the widening of ballast grading, and within the size distribution limits, the resistance of the ballast bed satisfies the specification; (2) the lateral and longitudinal resistance of ballast bed increases with an increase in the sleeper depth and the resistance of ballast bed satisfies the specifications for sleeper depth greater than 150 mm; (3) the lateral resistance of the ballast bed increases with a decrease in the angle of the shoulder slope, whereas the longitudinal resistance remains unchanged and the resistance of the ballast bed satisfies the specifications for slope gradient of 1:1.75 or less; and finally, (4) the lateral resistance of the ballast bed increases with the widening of the ballast bed shoulder, whereas the longitudinal resistance remains unchanged, and the resistance of ballast bed satisfies the specifications when the shoulder width is greater than 400 mm.

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DEM analysis of railway track lateral resistance

Cited by 51 publications

References 11 publications

Review of the lateral resistance of ballasted tracks

Review of the lateral resistance of ballasted tracks

Numerical and experimental analysis of single tie push tests on different shapes of concrete sleepers in ballasted tracks

Ballast bed resistance characteristics based on discrete-element modeling

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