Modelling the effects of trafficking and tamping on scaled railway ballast in triaxial tests

Aingaran, Sinthuja; Pen, Louis Le; Zervos, A.; Powrie, W.

doi:10.1016/j.trgeo.2018.04.004

Cited by 39 publications

(15 citation statements)

References 18 publications

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“…The Network Rail grain size specification for full size ballast, shown in Fig. 9, is too large for triaxial testing of specimens less than at least 200 mm in diameter; hence a 1 / 3 scale ballast that reproduces the key attributes of fresh ballast mechanical behaviour has been developed [8] and used in standard triaxial and other laboratory tests [9,11,26]. Here, the aim is to develop a scaled material representative of used ballast, for use in triaxial tests on 150 mm diameter specimens.…”

Section: Scaled Ballastmentioning

confidence: 99%

Grain characterisation of fresh and used railway ballast

et al. 2022

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Ballasted railway track requires regular maintenance to reverse the effects of plastic deformation of the trackbed, which leads to a gradual loss of level. Maintenance is usually by tamping, an aggressive process, which damages ballast grains such that the interval between maintenance interventions steadily reduces with increasing number of tamps. After a certain number of tamps, the ballast is deemed life expired and renewed, with the recovered ballast usually being down-cycled to lower grade uses. The ability to re-use the recovered ballast in the trackbed would make a significant contribution to decarbonising and improving the sustainability of railway infrastructure. This requires detailed knowledge of how the grain characteristics affecting mechanical behaviour differ between fresh and used ballast—specifically grain shape. This paper compares the shape parameters of form, angularity and surface roughness of fresh and used ballast, and proposes a method to synthesize full-size and scaled used ballast for use in laboratory and model tests.

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Section: Scaled Ballastmentioning

confidence: 99%

Grain characterisation of fresh and used railway ballast

et al. 2022

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“…It was concluded that degradation rate after tamping was increased. A paper [25] investigates the reasons for the deterioration rate increase in ballast after tamping with reference to triaxial tests on scaled ballast. The implication of the study is that the tamping is disruptive to ballast structure and resilience, and the tamping should be carried out as rarely as possible.…”

Section: Literature Reviewmentioning

confidence: 99%

“…The full-hydraulic tamping allows load-controlled tamping with better compaction quality as well as lower energy consumption and noise emission. However, the main shortcoming of the tine tamping is a high destruction of ballast material particles, which was indicated in many studies [22][23][24][25]. A high destruction and multiple tamping leads to a necessity of costexpensive ballast cleaning.…”

Section: Analysis Of Technologies For Track Geometry Correctionmentioning

confidence: 99%

Experimental and Theoretical Evaluation of Side Tamping Method for Ballasted Railway Track Maintenance

Przybyłowicz¹,

Sysyn²,

Kovalchuk³

et al. 2020

Transport Problems

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Ballast layer is the most weak element of railway track that causes track geometry deterioration. At the same time, it is subjected to intensive particle breakage during the corrective tamping. This causes high maintenance costs of ballasted track. The present paper is devoted to the study of tamping methods. The present machine tamping methods are considered and compared. The possible influence of the tamping technology on the ballast-related maintenance costs is analyzed. The side tamping technology is studied in detail with theoretical and experimental methods. The process of material transport during the side tamping is studied using a scale model of ballast layer and photogrammetric measurements. A theoretical finite element model (FEM) is validated to the experimental results. The study shows that the side tamping is a promising method for the development of a universal, superstructure independent tamping technology.

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“…According to parallel gradation technique, if the model material is composed of the same material as the prototype material and its particle size is parallel to the prototype material, and then scaleddown particle size can be used for triaxial testing [23,24]. Consecutively, many researchers have used the parallel gradation technique to predict the strength, stiffness and compressive properties of a larger material [25][26][27][28][29][30].…”

Section: Laboratory Testing Programme Materialsmentioning

confidence: 99%

Physico-Chemical and Mechanical Characterization of Steel Slag as Railway Ballast

2020

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With the rapid development of dedicated fright corridors, semi-high speed railroads and upgradation of the existing railroad to higher speed limit, Indian railways need a huge amount of natural ballast material. However, towards sustainable development, steel slag has enormous potential to be used as railway ballast. An in-depth understanding of material characteristics of steel slag is imperative for its proper use as a ballast material. The present studies examine the suitability of steel slag as railway ballast material based on their physico-chemical and mechanical characteristics. The physical properties such as specific gravity, water absorption and particle size distribution have been determined. For the chemical characterization, X-ray diffraction and energy-dispersive X-ray spectroscopy have been carried out and found that steel slag is enriched in calcium oxide (CaO), iron oxide (FeO) and silica (SiO 2 ) along with a little amount of magnesia (MgO) and alumina (Al 2 O 3 ). Along with it, leaching of heavy metals such as Hg, Pb, As, Ba, Cd, Cr, Cu, Fe, Ni and Zn from it using acid digestion testing method has also been carried out. Mechanical properties such as resistance of steel slag aggregate against abrasion, impact and crushing action have been performed. In addition, the cyclic triaxial tests are performed to get a better insight into characteristics under a passing train wheels. Maximum deviator stress and angle of shearing resistance are determined from monotonic load tests, and resilient modulus, permanent axial strain and damping ratio are determined from cyclic load tests. Results show that physical and mechanical properties are within the standards prescribed by the major countries.

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Modelling the effects of trafficking and tamping on scaled railway ballast in triaxial tests

Abstract: Modelling the effects of trafficking and tamping on scaled railway ballast in triaxial tests. Transportation Geotechnics.

Cited by 39 publications

References 18 publications

Grain characterisation of fresh and used railway ballast

Grain characterisation of fresh and used railway ballast

Experimental and Theoretical Evaluation of Side Tamping Method for Ballasted Railway Track Maintenance

Physico-Chemical and Mechanical Characterization of Steel Slag as Railway Ballast

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