Mechanical characterisation of the fouled ballast in ancient railway track substructure by large-scale triaxial tests

Trinh, Viet Nam; Tang, Anh Minh; Cui, Yu‐Jun; Dupla, Jean Claude; Canou, Jean; Calon, Nicolas; Lambert, Lucie; Robinet, Alain; Schoen, Olivier

doi:10.1016/j.sandf.2012.05.009

Cited by 130 publications

(60 citation statements)

References 24 publications

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“…All the tests were conducted by applying a cyclic load as a 5 Hz haversine, bell-shaped loading pulse with peaks (200 kPa or 300 kPa) and rest loads (11.7 kPa) [37] for 200,000 repetitions. This frequency is considered corresponding to the frequency measured in situ for a train speed of 100 km/h [38] and is commonly used in laboratory dynamic tests simulating railway traffic loading [39]. A constant initial confining pressure of 10 kPa was applied to all the specimens as representative of the in-situ confining pressure of self standing ballast [40].…”

Section: Test Set Upmentioning

confidence: 99%

Bitumen stabilized ballast: A potential solution for railway track-bed

D’Angelo

Thom

Presti

2016

Construction and Building Materials

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Davide (2016) Bitumen stabilized ballast: a potential solution for railway track-bed. Construction and Building Materials, 124 . pp. 118-126. ISSN 1879-0526 Access from the University of Nottingham repository: http://eprints.nottingham.ac.uk/36984/1/Accepted%20Manuscript%20-%20Bitumen %20stabilized%20ballast%20-%20A%20potential%20solution%20for%20railway%20track-bed.pdf Copyright and reuse:The Nottingham ePrints service makes this work by researchers of the University of Nottingham available open access under the following conditions. This article is made available under the Creative Commons Attribution Non-commercial No Derivatives licence and may be reused according to the conditions of the licence. For more details see: http://creativecommons.org/licenses/by-nc-nd/2.5/ A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. U N C O R R E C T E D P R O O F ARTICLE INFO ABSTRACTRailway ballast degradation under dynamic loads progressively leads to loss of mechanical performance and geometry of the track, so that maintenance interventions are frequently needed. In order to systematically avoid this issue, recently solutions have been proposed to reinforce track-bed by using polyurethane and/or resins as well as asphalt layers among others. Nonetheless, their main limitations are related to the high initial cost and low productivity.To cope with these limitations, in this study, bitumen stabilized ballast (BSB) is proposed as a new solution for ballast stabilization. This method aims at improving durability and reducing settlement by modifying both stiffness and the ability of energy dissipation of the layer. The paper introduces the potential of this technology as material to be used in railway track-beds by presenting the results of a laboratory-based investigation using the Precision Unbound Material Analyser (PUMA). Different variables such as ballast grading, bitumen emulsion dosage, compaction method and stress levels are considered. Results showed a significant decrease in permanent deformation and deformation rate associated with modified stiffness and energy dissipation properties of BSB, which suggest the potential for improving long-term performance and sustainability of ballasted track.

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Section: Test Set Upmentioning

confidence: 99%

Bitumen stabilized ballast: A potential solution for railway track-bed

D’Angelo

Thom

Presti

2016

Construction and Building Materials

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“…However, it appears that no single bond strength for the 8-asperity clump is capable of capturing the mobilized strength and dilation at both 15 and 200 kPa. Thus the effect of the number of the crushable asperities on the behaviour was investigated in simulations [8][9][10].…”

Section: Simulations With Breakagementioning

confidence: 99%

“…In order to design ballasted track and maintain it properly, it is important to fully understand the mechanical behaviour of the ballast material. With regards to most geomaterials, the triaxial test is one of the most useful laboratory tests for investigating the deformation and strength of railway ballast [2][3][4][5][6][7][8][9]. Indraratna et al [2] performed large scale triaxial tests on latite basalt under various confining pressures and found the angle of internal friction was a function of the confining pressure and particle breakage was more pronounced at higher confining pressure.…”

Section: Introductionmentioning

confidence: 99%

Discrete element modelling of scaled railway ballast under triaxial conditions

McDowell

2016

Granular Matter

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The aim of this study is to demonstrate the use of tetrahedral clumps to model scaled railway ballast using the discrete element method (DEM). In experimental triaxial tests, the peak friction angles for scaled ballast are less sensitive to the confining pressure when compared to fullsized ballast. This is presumed to be due to the size effect on particle strength, whereby smaller particles are statistically stronger and exhibit less abrasion. To investigate this in DEM, the ballast is modelled using clumps with breakable asperities to produce the correct volumetric deformation. The effects of the quantity and properties of these asperities are investigated, and it is shown that the strength affects the macroscopic shear strength at both high and low confining pressures, while the effects of the number of asperities diminishes with increasing confining pressure due to asperity breakage. It is also shown that changing the number of asperities only affects the peak friction angle but not the ultimate friction angle by comparing the angles of repose of samples with different numbers of asperities.

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“…The mechanical behaviour has been investigated using a large scale cyclic triaxial cell that can host a sample of 300 mm diameter and 600 mm height [29]. Emphasis was put on the effects of water content and fines content on the resilient modulus and permanent deformation [30].…”

Section: Mechanical Behaviourmentioning

confidence: 99%

Unsaturated railway track-bed materials

Cui

2016

E3S Web Conf.

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Abstract. Railway track-bed materials are mostly in unsaturated state, and their hydro-mechanical properties depend strongly on their water contents or suctions. In France, problematic soils such as collapsible loess and swelling marl can be origin of instability problems for new lines for high speed trains, while the hydro-mechanical behaviour of interlayer soil formed mainly by interpenetration of ballast and subgrade soil is of concern for conventional lines. In the latter case, the main challenge relies in the large variability of the interlayer soils owing to the variability of natural subgrade soils involved in the railway network. In this paper, a study on interlayer soils is presented, that covers a large spectrum of aspects: geotechnical/geophysical site characterisation, laboratory investigation into the hydraulic behaviour and mechanical behaviour as well as the mud pumping/interlayer creation phenomena, and field monitoring. The combined effect of water content and fines content were emphasized in the laboratory investigation, whilst interaction between atmosphere and track was focused on in the field monitoring. The results show clearly that it is of paramount importance to consider the unsaturated aspect of track-bed materials when analysing the overall behaviour of tracks, in particular when clay is involved in fine fraction.

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Mechanical characterisation of the fouled ballast in ancient railway track substructure by large-scale triaxial tests

Cited by 130 publications

References 24 publications

Bitumen stabilized ballast: A potential solution for railway track-bed

Bitumen stabilized ballast: A potential solution for railway track-bed

Discrete element modelling of scaled railway ballast under triaxial conditions

Unsaturated railway track-bed materials

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