Application of Shock Mats in Rail Track Foundation Subjected to Dynamic Loads

Navaratnarajah, S. K.; Indraratna, Buddhima; Nimbalkar, Sanjay

doi:10.1016/j.proeng.2016.06.152

Cited by 12 publications

(11 citation statements)

References 13 publications

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“…Increase in contact area reduces the contact stress at this interface significantly [18, 20], which can be assumed to be the reason why help to reduce ballast degradation, at least near the sleeper/ballast interface. This has been confirmed by the smaller amount of fines measured at the end of test with [12, 13, 18]. Not only the contact area, but the number of contacts at the sleeper/ballast interface also increase with [20].…”

Section: Introductionmentioning

confidence: 68%

“…Not only the contact area, but the number of contacts at the sleeper/ballast interface also increase with [20]. A common behavior observed by most researchers in experimental tests is the reduced settlement with [10, 12, 16, 18, 21], however a clear understanding at the microscopic ballast level scale is experimentally challenging. In track systems, due to higher bending of the rail with , the axle load is distributed to more sleepers.…”

Section: Introductionmentioning

confidence: 99%

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Micro-mechanical investigation of railway ballast behavior under cyclic loading in a box test using DEM: effects of elastic layers and ballast types

et al. 2019

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Ballasted tracks are the commonly used railway track systems with constant demands for reducing maintenance cost and improved performance. Elastic layers are increasingly used for improving ballasted tracks. In order to better understand the effects of elastic layers, physical understanding at the ballast particle level is crucial. Here, discrete element method (DEM) is used to investigate the effects of elastic layers – under sleeper pad () at the sleeper/ballast interface and under ballast mat () at the ballast/bottom interface – on micro-mechanical behavior of railway ballast. In the DEM model, the Conical Damage Model (CDM) is used for contact modelling. This model was calibrated in Suhr et al. (Granul Matter 20(4):70, 2018) for the simulation of two different types of ballast. The CDM model accounts for particle edge breakage, which is an important phenomenon especially at the early stage of a tamping cycle, and thus essential, when investigating the impact of elastic layers in the ballast bed. DEM results confirm that during cyclic loading, reduces the edge breakage at the sleeper/ballast interface. On the other hand, shows higher particle movement throughout the ballast bed. Both the edge breakage and particle movement in the ballast bed are found to influence the sleeper settlement. Micro-mechanical investigations show that the force chain in deeper regions of the ballast bed is less affected by for the two types of ballast. Conversely, dense lateral forces near to the box bottom were seen with . The findings are in good (qualitative) agreement with the experimental observations. Thus, DEM simulations can aid to better understand the micro-macro phenomena for railway ballast. This can help to improve the track components and track design based on simulation models taking into account the physical behavior of ballast.Graphical Abstract

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Section: Introductionmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Micro-mechanical investigation of railway ballast behavior under cyclic loading in a box test using DEM: effects of elastic layers and ballast types

et al. 2019

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“…Resilient mats can be grouped into two categories, because of the range of applications in various types of railways track construction:  Under-Ballast Mats (UBM)/ Sub-Ballast Mats (SBM)used in ballast railway track (Fig. 1); their two variants can be classified due to the main purpose of their use according to standard [11]: a. used primarily for isolation from vibration, b. used primarily for stress reduction in ballast [12,13].  Slab-Track Mats (STM)used in ballastless railway track (applied under or from the sides of concrete track base plate - Fig.…”

Section: Resilient Support and Fixing Of Rail Track Structurementioning

confidence: 99%

Overview of vibroacoustic isolators used in railway tracks

et al. 2018

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The paper presents an overview of vibroacoustic isolators used in railway tracks to reduce negative effects from railway traffic. These include single components or their assemblies, with different material characteristics and location in the track structure due to track structure type (ballasted or ballastless track system). The reduction of negative effects relates mainly to the reduction of vibration and structure-borne noise. The practical solutions for railway structures include various components that perform different functions at the same time: vibroacoustic isolation and mechanical function to ensure safe and durable use of rail track (i.e. rail fastening systems, rail supporting structures). The main goals of this paper are systematization and description of basic material characteristics of vibroacoustic isolators applied sufficiently close to the place of vibration generation during the movement of rail vehicles.

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“…[3][4][5]10,28,[31][32][33][34] Since they increase the contact surface between ballast and sub-ballast, avoiding excessive contact forces between the interface and ballast particles causing loads to distribute uniformly, they have lots of advantages, including increasing stability and improving the elasticity of track, isolating track from relatively softer subgrade, attenuating noise and vibration, reducing track deformation as well as ballast protection, ballast thickness reduction, and proper transition zones. 14,[35][36][37][38] All in all, UBMs are an effective solution that can improve the dynamic behavior of track, track stiffness, and overall vertical elasticity of the substructure, as well as having a beneficial effect on track alignment and maintaining a long service life. 35,[39][40][41] Table 1 shows some available UBMs.…”

Section: Introductionmentioning

confidence: 99%

Under ballast mat – A review of recent developments, limitations, and future prospects

Wang

Jing

Wang³

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part F:

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A high frequency of loadings and an excessive amount of axle loads are rising as trains are becoming faster and heavier. In this regard, improvements in track design, such as using an under ballast mat, are vital to performance improvement. In addition to reducing noise, vibration, and ballast degradation, UBMs are designed to improve the dynamic behavior of tracks, thus extending their service life and increasing safety. This paper provides an overview of the recent developments on UBMs, identifies the crucial characteristics of different kinds of mats, including fatigue strength, environmental conditions, stiffness, and ballast deformation, and describes challenges for more widespread adoption. Limitations of using a UBM include their high cost and stiffness, limited knowledge of long-term efficiency, and interlocking reliability. This paper also provides future perspectives and prospects for overcoming the challenges in the utilization and acceptance of UBMs.

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Application of Shock Mats in Rail Track Foundation Subjected to Dynamic Loads

Cited by 12 publications

References 13 publications

Micro-mechanical investigation of railway ballast behavior under cyclic loading in a box test using DEM: effects of elastic layers and ballast types

Micro-mechanical investigation of railway ballast behavior under cyclic loading in a box test using DEM: effects of elastic layers and ballast types

Overview of vibroacoustic isolators used in railway tracks

Under ballast mat – A review of recent developments, limitations, and future prospects

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