Novel discrete element modeling coupled with finite element method for investigating ballasted railway track dynamics

Nishiura, Daisuke; Sakai, Hirotaka; Aikawa, Atsushi; Tsuzuki, Satori; Sakaguchi, Hiroki

doi:10.1016/j.compgeo.2017.10.011

Cited by 37 publications

(20 citation statements)

References 47 publications

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“…track subsidence At present, a large number of models, from simple phenomenological models to complex finite element and discrete element models are presented for calculating deformation processes in the ballast layer. The complex models (Nielsen 2018, Nishiura at al. 2018, Miguel at al.…”

Section: The Present Phenomenological Models Ofmentioning

confidence: 99%

The complex phenomenological model for prediction of inhomogeneous deformations of railway ballast layer after tamping works

Sysyn

Gerber

Kovalchuk

et al. 2018

AoT

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The given article considers the method of calculating the track geometry deformation with respect to uneven accumulation of residual deformations along the track. The technique proposes two significant changes in existing approaches to calculating the efficiency of the ballast layer. The transition from the approach of allowable stresses design in the ballast layer to the deformative approach of accumulations of track geometry deformations allows us to draw conclusions regarding the intervals of track tamping and the duration of ballast layer life cycle. The transition from the determinative to probabilistic approaches makes it possible to draw conclusions not only from the average unevenness, but also with regard to all possible facts of unevenness. The method is based on the mechanism of sudden and gradual deformations occurrence, which depends on a number of key factors: dynamic stresses on the ballast, non-uniformity of track elasticity, performance of current maintenance work. Based on the experimental studies results, the dependencies of sudden deformations and the intensity of gradual deformations on the level of stress on the ballast layer were established. The experimental results of the influence of the sub-ballast base elasticity on the intensity of accumulation of residual deformations are shown. On the basis of the developed method, the prediction of track geometry deterioration for a given structure of the track, the rolling stock and the permissible level of geometric deviations for track maintenance is presented.

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Section: The Present Phenomenological Models Ofmentioning

confidence: 99%

The complex phenomenological model for prediction of inhomogeneous deformations of railway ballast layer after tamping works

Sysyn

Gerber

Kovalchuk

et al. 2018

AoT

View full text Add to dashboard Cite

show abstract

“…Earlier studies have shown the feasibility of the DEM in evaluating the ballast performance [26][27][28][29][30][31][32]. However, there still exist some aspects for improvement.…”

Section: Introductionmentioning

confidence: 99%

Discrete element modelling of railway ballast performance considering particle shape and rolling resistance

et al. 2020

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To simulate ballast performance accurately and efficiently, the input in discrete element models should be carefully selected, including the contact model and applied particle shape. To study the effects of the contact model and applied particle shape on the ballast performance (shear strength and deformation), the direct shear test (DST) model and the large-scale process simulation test (LPST) model were developed on the basis of two types of contact models, namely the rolling resistance linear (RRL) model and the linear contact (LC) model. Particle shapes are differentiated by clumps. A clump is a sphere assembly for one ballast particle. The results show that compared with the typical LC model, the RRL method is more efficient and realistic to predict shear strength results of ballast assemblies in DSTs. In addition, the RRL contact model can also provide accurate vertical and lateral ballast deformation under the cyclic loading in LPSTs.

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“…erefore, to address the coupling dynamics, many scholars, e.g., Gao and Xu [20] and Ngo et al [21], built the numerical model of the granular ballast soil subgrade based on the coupling algorithm of discrete element and finite difference, analyzed the interface stress of its interaction, and verified the correctness of the model through the field measurement results. Dowding and Gilbert [22], Michael et al [23], and Nishiura et al [24] established the coupling models of the bulk track bed and track structure by means of the coupling method of discrete element and finite element to study the mechanical characteristics of the ballasted track. e coupling of the discrete element, the finite element, and the finite difference method provides a new method for studying the interaction between the ballast and the track structure.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Coupling Mechanism between Ballast Bed and Track Structure of High-Speed Railway

Xue-jun

et al. 2020

Mathematical Problems in Engineering

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In this paper, a discrete and continuous body coupling algorithm is used to study the dynamic contact characteristics between ballasts and between ballasts and track structures. Firstly, the three-dimensional fine modeling of ballast particles is realized based on the three-dimensional laser scanning method, and then through the discrete and continuum coupling algorithm from the micro-macro point of view, a multiscale and unified particle-track structure coupling model is established. Based on the coupling model, the macro-and microdynamic characteristics of the ballast bed and the mechanical characteristics of the track structure under the dynamic load of high-speed trains with different driving speeds are studied. It is shown that the cumulative settlement of the ballast bed is directly proportional to the contact force and rotation speed of the ballast, and the faster the driving speed is, the greater the cumulative deposition speed and cumulative settlement of the ballast are. e contact force between the ballast and sleeper mainly comes from the bottom of the sleeper, and its contact force and contact strength increase with the increase of driving speed.

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Novel discrete element modeling coupled with finite element method for investigating ballasted railway track dynamics

Cited by 37 publications

References 47 publications

The complex phenomenological model for prediction of inhomogeneous deformations of railway ballast layer after tamping works

The complex phenomenological model for prediction of inhomogeneous deformations of railway ballast layer after tamping works

Discrete element modelling of railway ballast performance considering particle shape and rolling resistance

Modeling of Coupling Mechanism between Ballast Bed and Track Structure of High-Speed Railway

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