Stress-dilatancy behaviour of fouled ballast: experiments and DEM modelling

Chen, Jing; Indraratna, Buddhima; Vinod, Jayan S.; Ngo, Ngoc Trung; Gao, Rui; Liu, Yangzepeng

doi:10.1007/s10035-021-01150-1

Cited by 19 publications

(2 citation statements)

References 43 publications

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“…A linear contact model was employed in the current DEM analysis. The relevant microscopic parameters, as listed in Table 1, were inherited from previous studies by the authors [30,31] and are detailed in Table 1. In this study, a total of six different PSDs (Figure 3) were considered, with three of them being non-uniformly distributed (referred to as Grading A, B, and C), and the remaining three were uniformly distributed with mono-sizes (referred to as Grading D, E, and F).…”

Section: Monotonic Shearing Testmentioning

confidence: 99%

Effects of Particle Size and Grading on the Breakage of Railway Ballast: Laboratory Testing and Numerical Modeling

Chen,

Liu,

et al. 2023

Sustainability

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Ballast is coarse aggregate with particle size normally ranging from 10 mm to 65 mm. Upon repeated train loading, ballast deteriorates in the form of either continuous abrasion of sharp corners or size degradation, which have been reported as the fundamental cause for the instability of railway tracks. In this study, the splitting behavior of ballast grain with varying particle sizes under diametrical compression was examined to investigate the size effect and the Weibull characteristics of ballast tensile strength; a Weibull modulus of 2.35 was measured for the tested granite ballast. A series of large-scale monotonic triaxial tests on ballast aggregates having various size gradings was performed to study the effect of particle gradation on the mechanical behavior of ballast. The results show that compared to mono-sized uniformly distributed aggregates, non-uniformly distributed aggregates generally have greater shear strength, larger peak friction angle, 50% strength modulus, and greater volumetric dilation. The ballast aggregate conforming to the recommended PSD as per current standards exhibited the most superior mechanical performance, possessing the greatest shear strength, peak friction angle, and 50% strength modulus. Micromechanical analysis showed that aggregates with larger d50 values have higher coordination numbers, inter-particle contact forces, and higher anisotropy level of contact normals, thus causing a greater possibility of particle breakage during shearing.

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Section: Monotonic Shearing Testmentioning

confidence: 99%

Effects of Particle Size and Grading on the Breakage of Railway Ballast: Laboratory Testing and Numerical Modeling

Chen,

Liu,

et al. 2023

Sustainability

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“…DEM allows a more detailed study of the ballast in particle level than is often possible in experiments. For instance, the porosity changes in the ballast can be measured using DEM, or as in Chen et al's study [6], other parameters such as coordination number or the rotation angle of each particle can be monitored by DEM. Monitoring the force chains during the loading is another positive aspect of performing DEM simulations [7].…”

Section: Introductionmentioning

confidence: 99%

Modelling of Railway Sleeper Settlement under Cyclic Loading Using a Hysteretic Ballast Contact Model

et al. 2021

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Ballasted tracks are common in the railway system as a means of providing the necessary support for the sleepers and the rails. To keep them operational, tamping and other maintenance actions are performed based on track geometry measurements. Ballast particle rearrangement, which is caused by train load, is one of the most important factors leading to track degradation. As a result, when planning maintenance, it is vital to predict the behaviour of the ballast under cyclic loading. Since ballast is a granular matter with a nonlinear and discontinuous mechanical behaviour, the discrete element method (DEM) was used in this paper to model the ballast particle rearrangement under cyclic loading. We studied the performance of linear and nonlinear models in simulating the settlement of the sleeper, the lateral deformation of the ballast shoulder and the porosity changes under the sleeper. The models were evaluated based on their ability to mimic the ballast degradation pattern in vertical and lateral direction. The linear contact model and the hysteretic contact model were used in the simulations, and the effect of the friction coefficient and different damping models on the simulations was assessed. An outcome of this study was that a nonlinear model was proposed in which both the linear and the hysteretic contact models are combined. The simulation of the sleeper settlement and the changes in the porosity under the sleeper improved in the proposed nonlinear model, while the computation time required for the proposed model decreased compared to that required for the linear model.

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Dem Study on the Dynamic Performance of a Fouled Ballasted Track Under Repeated Traffic Loading

Chen,

Indraratna,

Vinod

et al. 2024

Lecture Notes in Civil Engineering

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Stress-dilatancy behaviour of fouled ballast: experiments and DEM modelling

Cited by 19 publications

References 43 publications

Effects of Particle Size and Grading on the Breakage of Railway Ballast: Laboratory Testing and Numerical Modeling

Effects of Particle Size and Grading on the Breakage of Railway Ballast: Laboratory Testing and Numerical Modeling

Modelling of Railway Sleeper Settlement under Cyclic Loading Using a Hysteretic Ballast Contact Model

Dem Study on the Dynamic Performance of a Fouled Ballasted Track Under Repeated Traffic Loading

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