Characterization of geogrid reinforced ballast behavior at different levels of degradation through triaxial shear strength test and discrete element modeling

Qian, Yu; Mishra, Debakanta; Tutumluer, Erol; Kazmee, Hasan

doi:10.1016/j.geotexmem.2015.04.012

Cited by 103 publications

(47 citation statements)

References 21 publications

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“…With the use of irregular shapes, the shear strength of ballast particles has been successfully modelled by triaxial simulations [18][19][20][21]. The improvement of using geogrid-reinforced ballast has also been successfully [22][23][24][25] by representing the geogrid as a group of bonded spheres, which is similar to the generation method for the USP in this study. In this paper, DEM is employed to simulate the behaviour of an under sleeper pad in a box test developed by McDowell [26].…”

Section: Introductionmentioning

confidence: 93%

Discrete element modelling of under sleeper pads using a box test

McDowell

2018

Granular Matter

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It has recently been reported that under sleeper pads (USPs) could improve ballasted rail track by decreasing the sleeper settlement and reducing particle breakage. In order to find out what happens at the particle-pad interface, discrete element modelling (DEM) is used to provide micro mechanical insight. The same positive effects of USP are found in the DEM simulations. The evidence provided by DEM shows that application of a USP allows more particles to be in contact with the pad, and causes these particles to transfer a larger lateral load to the adjacent ballast but a smaller vertical load beneath the sleeper. This could be used to explain why the USP helps to reduce the track settlement. In terms of particle breakage, it is found that most breakage occurs at the particle-sleeper interface and along the main contact force chains between particles under the sleeper. The use of USPs could effectively reduce particle abrasion that occurs in both of these regions.

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Section: Introductionmentioning

confidence: 93%

Discrete element modelling of under sleeper pads using a box test

McDowell

2018

Granular Matter

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“…From the literature, several studies on railroad ballast was done using monotonic triaxial test [10,29,[31][32][33]. Large number of publications in the literature studied the mechanical behaviour of railroad ballast under cyclic loading condition like [18,22,23,25,27,34,35].…”

Section: Test Typementioning

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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“…For example, typical specimen sizes selected by researchers for direct shear testing of railroad ballast are 400 400 300 mm mm mm  (Dissanayake et al, 2016), 300 300 200 mm mm mm  (Indraratna et al, 2012;Ngo et al, 2014). Similarly, typical cylindrical specimen sizes used for triaxial monotonic shear strength testing of railroad ballast are, 610 height 305 diameter mm mm  (Qian et al, 2013(Qian et al, , 2015Mishra et al, 2014a), 600 height 300 diameter mm mm  (Indraratna et al, 2009(Indraratna et al, , 2012Lu and McDowell, 2010;Ngo et al 2016), 508 height 254 diameter mm mm  (Kashani et al, 5 2017, Rohrman et al, 2017, 300 height 150 diameter mm mm  (McDowell and Li, 2016).…”

Section: Background and Problem Statementmentioning

confidence: 99%

“…Owing to the large particle-size (often as large as 63 mm ) of railroad ballast, significantly large specimens have to be tested in the laboratory for realistic estimation of the shear strength properties. For example, typical specimen sizes selected for triaxial monotonic shear strength tests are, 610 height 305 diameter mm mm  (Qian et al, 2013(Qian et al, , 2015Mishra et al, 2014a). A schematic of the stresses applied to the specimen in a triaxial test setup is shown in Figure 2.8.…”

Section: Triaxial Monotonic Shear Strength Testingmentioning

confidence: 99%

“…The triaxial shear strength test is traditionally performed in the laboratory to evaluate the effects of monotonic and repeated loading on ballast behavior (Indraratna et al, , 2009Suiker et al, 2005;Aursudkij et al, 2009;Lu and McDowell, 2010;Qian et al, 2013Qian et al, , 2014Qian et al, , 2015Mishra et al, 2014a;McDowell and Li, 2016;Ngo et al, 2016).…”

Section: Dem Simulation Of Triaxial Monotonic Shear Strength Tests (Txt)mentioning

confidence: 99%

See 1 more Smart Citation

Effect of Particle Size Distribution and Packing Characteristics on Railroad Ballast Shear Strength: A Numerical Study Using the Discrete Element Method

Mahmud¹

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Characterization of geogrid reinforced ballast behavior at different levels of degradation through triaxial shear strength test and discrete element modeling

Cited by 103 publications

References 21 publications

Discrete element modelling of under sleeper pads using a box test

Discrete element modelling of under sleeper pads using a box test

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

Effect of Particle Size Distribution and Packing Characteristics on Railroad Ballast Shear Strength: A Numerical Study Using the Discrete Element Method

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