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Numerical simulations of the railway ballast
International Conference on Road and Rail Infrastructure, 2018The numerical simulations are usually carried out in order to determine the characteristics of the loaded structure. Discrete element method (DEM) has several advantages in use for research of the granular material such as railway ballast. Several simplifications of the railway system in the numerical models affect the accuracy of the simulation ...
Lazarević, Damir +2 more
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Geological Society, London, Engineering Geology Special Publications, 2001
Railway track formations generally consist essentially of a layer of coarse aggregate, or ballast, in which the sleepers are embedded (see Fig. 12.1). The ballast may rest directly on the subgrade or, depending on the bearing capacity, on a layer of blanketing sand. The layer of ballast is intended to provide a free draining base which is stable enough
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Railway track formations generally consist essentially of a layer of coarse aggregate, or ballast, in which the sleepers are embedded (see Fig. 12.1). The ballast may rest directly on the subgrade or, depending on the bearing capacity, on a layer of blanketing sand. The layer of ballast is intended to provide a free draining base which is stable enough
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Discrete element modelling of railway ballast
Granular Matter, 2005The discrete element method has been used to simulate the behaviour of railway ballast under different test conditions. Single particle crushing tests have been simulated using agglomerates of bonded balls, and the distribution of strengths correctly follows the Weibull distribution, and the size effect on average strength is also consistent with that ...
W. L. Lim, G. R. McDowell
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Railway Ballast Permeability and Cleaning Considerations
Transportation Research Record: Journal of the Transportation Research Board, 2017The unbound aggregate ballast layer is a major structural and drainage component of railroad track that is known to degrade over time. Progressive degradation increases the fine-grained content of the ballast layer through particle breakage and abrasion or from external sources, such as subgrade or foreign material.
Scott Schmidt +6 more
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Deformational behavior of fouled railway ballast
Canadian Geotechnical Journal, 2015Plastic strain of railway ballast subjected to various fouling conditions was determined under simulated traffic loading through testing with large-scale cyclic triaxial equipment. Mechanisms by which fouling material affects the plastic strain of railway ballast were investigated.
Ali Ebrahimi +2 more
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Ballast drainage in Brazilian railway infrastructures
Construction and Building Materials, 2015Abstract The main objective of this research work was to analyze the reduction in permeability of the ballast layer due to the presence of soil through laboratory tests. Granulometry and permeability tests were done comparing clean ballast samples with samples contaminated with 10%, 15%, 20%, 25% and 40% volumetric percentages of soil.
Cassio Paiva +2 more
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Automated Measurement of Railway Ballast Angularity
Journal of Materials in Civil Engineering, 2006Recent research achieved on recycled railway ballasts issued that they were not properly assessed using European standard test methods. Indeed, other characteristics such as wear stage of particles have to be checked to assess their resistance to tracks vertical deformations.
Yannick Descantes +2 more
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Mechanical properties of recycled railway ballast
2023Open Access. The published version of this work has been reproduced here in accordance with the author's self archiving and copyright policies.['Australasian Conference on the Mechanics of Structures and Materials. (16th : 1999 : Sydney, N.S.W.)']
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Quantifying the relative strengths of railway ballasts
Proceedings of the Institution of Civil Engineers - Geotechnical Engineering, 2005It is important to be able to distinguish easily between ballasts of poor quality and good quality in terms of strength. For a range of uniformly graded granular materials compacted to the same relative density, there will be two important factors influencing the strength of the aggregate: particle strength and voids ratio (which will be a function of
W. L. Lim, G. R. McDowell, A. C. Collop
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Development of integrated railway ballast quality index
International Journal of Pavement Engineering, 2019The quality of ballast materials is an important criterion in railway track maintenance management systems.
J. Sadeghi +2 more
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