Behaviour of Track Ballast Under Repeated Loading

Al-Saoudi, Namir K. S.; Hassan, Khawla H.

doi:10.1007/s10706-013-9701-z

Cited by 21 publications

(11 citation statements)

References 12 publications

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“…-relationship between ballast aggregate degradation, additionally cohesion, inner friction angle and the water permeability of material and its layer was investigated [29], -angularity breakage phenomenon [15,37], -relationship of PSD of ballast material and its mechanical abrasion was examined, and newly PSD was improved and induced according to more real loading conditions [26,56], -volumetric and axial deformations, additionally particle breakage were measured by laboratory triaxial testing regarding to different stress values (main stresses and deviator stresses) [8,37], -a special method was developed to be able to define PSD of ballast aggregate with using of ground penetrating radar (GPR) [4,55], -at DEM simulations more real particle shape generation method was researched and DEM models were validated [11,37,53], -laboratory and field tests were performed with and without geosynthetic inclusions, ballast material degradation was measured [10,15,38,46], -tyre derived aggregates (TDA) were tested in case of sand fouled ballasted tracks [18], -ballast grain degradation due to ballast tamping was investigated [1,17], -ballast structure with adhesive material was examined [30].…”

Section: Methodsmentioning

confidence: 99%

Special Laboratory Testing Method for Evaluation Particle Breakage of Railway Ballast Material

Fischer

2018

STP

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Purpose. There are special, standardized laboratory test methods to evaluate railway ballast particle breakage; they are the Los Angeles and the Micro-Deval abrasion test. The authors opine that these methods aren't the most adequate methods to assess the real ballast particle degradation because in reality never occurs these kinds of stresses and strains (i.e. particles in a rotating drum with or without steel balls and with or without water). A new laboratory test procedure is needed. The authors attempted to configure an adequate one in 2014, it is detailed in the paper, as well as the initial results and improvement possibility. This test method is related to dynamic pulsating test, the particle size distributions (PSD) had to be determined before and after fatigue. In 2017-2018 the research is supported by ÚNKP-17-4 program. Methodology. Multi-level steel box is utilized with a special layer structure, detailed in the paper. Five different types of railway ballast samples were tested. PSDs were defined, and regarding to the results relationship between ballast particle degradation values (according to Los Angeles and Micro-Deval abrasion tests, as well as this newly developed laboratory test method) was searched, as well as time interval between necessity railway ballast cleaning work was also calculated. Findings. The authors sentenced the results regarding to the self-developed laboratory test method that is able to assess the particle degradation and time interval between railway ballast cleaning work more precisely related to the real railway operation circumstances. Relationship was determined between particle breakage according to standardized and unique (non-standardized) laboratory test methods. Originality. The paper summarized the results a newly developed laboratory test method for evaluation of the degradation of railway ballast particles. Practical value. It sentenced the possibility to improve the measurements and assessments regarding to the research phase supported by the ÚNKP-17-4 project.

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Section: Methodsmentioning

confidence: 99%

Special Laboratory Testing Method for Evaluation Particle Breakage of Railway Ballast Material

Fischer

2018

STP

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“… laboratory tests [11,12,13,14,15,16,17,18,19]  finite element modelling (FEM) [13],  discrete element modelling (DEM) and/or 3D particle generation [19,20],  in-situ tests in railway tracks [21].…”

Section: History Of the Researchmentioning

confidence: 99%

Railroad Ballast Particle Breakage with Unique Laboratory Test Method

Fischer

Juhász

2019

Acta Tech Jaur

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This paper demonstrates the results in the research topic of the railway ballast particles’ breakage test with unique laboratory test. The most railway lines in the world have so called traditional superstructure (ballasted tracks). In the past few years there were a lot of railway rehabilitation projects in Hungary, as well as abroad. Nowadays cannot be expected that there is enough quantity of railway ballast in adequate quality, because of the modifications and restrictions in the related regulations in Hungary since 2010. In Hungary there are only a few quarries which are able to ensure adequate railway ballast material for construction and maintenance projects for speed values between 120 and 160 km/h. This may cause supply and quality risk in production of railway ballast. The authors’ research’s main goal is to be able to simulate the stress-strain effect of ballast particles in real and objective way in laboratory conditions as well as in discrete element modelling.

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“…There are two main materials used to build the box; wood [89,90,92] and steel [93][94][95][96][97][98]. Some researchers [91,99,100] used other transparent material like Perspex sheet to be used in one side of the steel box for better observation to the test sample during testing.…”

Section: Large Scale Equipmentmentioning

confidence: 99%

“…In the literature there are various number of box tests built and developed in a large-scale length to experimentally study the mechanical behaviour of railroad ballast under real traffic loadings. For example, box test built at the University of Massachusetts [89,101], box test build by Gerald and Richard [102] as a part of collaborative research between Queen's University and Royal Military College, box test developed by Selig and Waters [9], box test build at the University of Nottingham [91,103], box test designed and built at the University of Wollongong [95,104] and box test designed and built by Al-Saoudi and Hassan [99].…”

Section: Large Scale Equipmentmentioning

confidence: 99%

Large-scale triaxial and box testing on railroad ballast: a review

Alabbasi

Hussein

2019

SN Appl. Sci.

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The use of railway transportation systems has been increased throughout the years. The conventional ballasted tracks have been used widely in many countries around the world. Ballast material is the basic element of ballasted tracks. Ballast degrades and deforms after service. Therefore, periodical ballast maintenance is needed which is a cost and time expensive activity. Understanding ballast mechanical behavior leads to better design and efficient maintenance. From the literature, experimental approach is used to understand the mechanical behavior of railroad ballast. Traditional experimental tests provide inaccurate results due to the large ballast particle size with relative to sample size. Researchers used large scale triaxial and box tests extensively to understand the mechanical behavior of railroad ballast. The target of this paper is to present a concise review of the extensive literature presented on the mechanical behavior of railroad ballast using large scale triaxial and box testing. It discusses the various aspects of large-scale equipment such as apparatus' setup , size, material and shape, simulated load condition and test purpose. It presents the key findings of the large-scale triaxial and box tests in understanding ballast mechanical behavior.

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Behaviour of Track Ballast Under Repeated Loading

Cited by 21 publications

References 12 publications

Special Laboratory Testing Method for Evaluation Particle Breakage of Railway Ballast Material

Special Laboratory Testing Method for Evaluation Particle Breakage of Railway Ballast Material

Railroad Ballast Particle Breakage with Unique Laboratory Test Method

Large-scale triaxial and box testing on railroad ballast: a review

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