Improved Performance of Rail Track Substructure Using Synthetic Inclusions: Experimental and Numerical Investigations

Ngo, Ngoc Trung; Indraratna, Buddhima

doi:10.1007/s40891-016-0065-3

Cited by 23 publications

(9 citation statements)

References 29 publications

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“…Most of the settlement is caused by the permanent deformation of the ballast layer [1], which results from densification or dilation, distortion, and degradation, as concluded in [2]. Because ballast undergoes gradual and continuing degradation due to the cyclic loadings and the maintenance operations, researchers keep developing methods (examples in [3][4][5]) to study ballast bed degradation. Nevertheless, some issues are still controversial, such as the effects of shape and size on degradation and deformation.…”

Section: Introductionmentioning

confidence: 99%

Ballast degradation: Effect of particle size and shape using Los Angeles Abrasion test and image analysis

Guo

Markine

Song

et al. 2018

Construction and Building Materials

100

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Ballast track is the most widely used track for the railway transport, and ballast bed plays a significant role to provide resistances during train operation. Generally, the ballast bed consists of crushed stones. To achieve the mitigation of ballast degradation, the first priority is to describe the degradation development and to study its effect factors. The influence of ballast morphology (particle size and shape) on ballast degradation is examined here using the Los Angeles Abrasion (LAA 1) test in combination with 3-D image analysis. LAA tests are used to obtain the deteriorated ballast. Then, based on the 3-D images, the changes of ballast particles after the tests were analysed. To quantify the ballast degradation (abrasion and breakage), the Abrasion Depth based on the analysis of 3-D images were proposed, while ballast breakage was estimated using the broken particles ratio. The results have shown that ballast degradation is directly related to the ballast morphology. The proposed image-based procedure can effectively be applied to assess ballast degradation. The results can be used for ballast material standardization, modelling of ballast degradation process and maintenance cycle prediction.

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Section: Introductionmentioning

confidence: 99%

Ballast degradation: Effect of particle size and shape using Los Angeles Abrasion test and image analysis

Guo

Markine

Song

et al. 2018

Construction and Building Materials

100

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“…2. The angular-shaped grains of sub-ballast were simulated by connecting a number of circular-shaped particles together, mimicking the actual sub-ballast shape and angularity [21], [22], [23], [24]. A total of 26,567 particles, with sizes ranging from 0.5 to 19 mm, were generated to simulate actual sub-ballast 3 .…”

Section: Dem Modelling Of Cubical Triaxial Testmentioning

confidence: 99%

Dem Modelling of Geocell-Stabilised Sub-Ballast Under Cyclic Loading

Ngo¹

2017

GEOMATE

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Upon repeated train loading, sub-ballast aggregates, placed underneath a ballast layer in rail track, become degraded and fouled by the progressive accumulation of external fine particles such as mudpumping of soft subgrade, seriously decreasing the shear strength and drainage capacity of the track. This paper presents a study of the load-deformation response of geocell-reinforced sub-ballast under cyclic loads using laboratory tests and discrete element method (DEM). A series of large-scale cubical triaxial tests with and without geocell inclusions are conducted in the laboratory and simulated in DEM to investigate the beneficial effect of the geocells in decreasing the lateral and vertical deformations of railway subballast. Irregularly-shaped particles of sub-ballast are modelled by connecting and bonding of many circular balls together at appropriate sizes and positions. The geogcell was simulated by bonding many small spheres together to build a desired geometry and structure. The load-deformation behaviour of the geocell-stabilised sub-ballast specimen at varied load cycles predicted from the DEM modelling agrees well with those measured experimentally, showing that the proposed DEM model in this study is able to capture the deformation behaviour of the sub-ballast stabilised by the geocell. Additionally, the DEM modelling also provides insight into the distribution of contact forces, average contact normal and shear forces, which cannot be determined experimentally. These observations clearly prove the reinforcement effect of the geocell in eliminating the deformation of sub-ballast from a micromechanical perspective.

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“…The cyclic loading may not be recorded high at the interface of base and subgrade. However, it can be higher right underneath the loading plate [29]. Experimental research was used to validate the efficacy of the geosynthetic-reinforced pavements developed by finite element modeling [30].…”

Section: Introductionmentioning

confidence: 99%

A Parametric Study on Pavement with Geocell Reinforced Rock Quarry Waste Base on Dredged Soil Subgrade

Sheikh

Mandhaniya

Shah

2021

Int. J. of Geosynth. and Ground Eng.

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Dredging produces a vast amount of waste from water bodies worldwide, whose valorization is an environmental problem. Weak dredged soil requires some treatment to provide them with adequate strength for construction applications. In the present study, static plate load tests are conducted to understand the effect of high-density polyethylene geocell reinforcement on limestone aggregates and quarry waste on subgrade (dredged soil). Finite element analysis was carried out to compare the results with the experimental analysis. The dolomitic limestone and crushed quarry waste are waste materials readily available in the near vicinity. Static plate load tests were observed for three different geocell heights (100, 125 and 150 mm) in terms of increase in bearing capacity and vertical stress distribution for three different thicknesses of bases (120, 150 and 170 mm). This study aims to present the results in terms of load versus deformation and vertical stress distribution. The results showed that the reinforced layer had undergone a maximum reduction in deformation in comparison to the unreinforced bases. Due to the inclusion of geocell, the average bearing capacity improvement factor enhances, and the vertical stress distribution increases significantly. The average bearing increases by 50% in the case geocell reinforced test section. The results from this study suggest that rock quarry waste can be used as an alternative base material for pavement construction if proper geocell confinement is provided. The present study results will be used as a reference to support that valorization of waste can be beneficial for both nature and the economy.

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Improved Performance of Rail Track Substructure Using Synthetic Inclusions: Experimental and Numerical Investigations

Cited by 23 publications

References 29 publications

Ballast degradation: Effect of particle size and shape using Los Angeles Abrasion test and image analysis

Ballast degradation: Effect of particle size and shape using Los Angeles Abrasion test and image analysis

Dem Modelling of Geocell-Stabilised Sub-Ballast Under Cyclic Loading

A Parametric Study on Pavement with Geocell Reinforced Rock Quarry Waste Base on Dredged Soil Subgrade

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