Field Assessment of the Performance of a Ballasted Rail Track with and without Geosynthetics

Indraratna, Buddhima; Nimbalkar, Sanjay; Christie, David; Rujikiatkamjorn, Cholachat; Vinod, Jayan S.

doi:10.1061/(asce)gt.1943-5606.0000312

Cited by 216 publications

(123 citation statements)

References 18 publications

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“…The settlement pattern for ballast reinforced with other geogrids is also the same and is therefore not shown here for the sake of brevity. The settlement of ballast recorded from the current study follows a similar trend to that measured from the field by Indraratna et al (2010). For loading beyond 50000 cycles, ballast attains a stable packing and hence the total vertical settlement remains fairly constant ( Figure 4a).…”

Section: Vertical Settlement Of Ballast and Subballast Layerssupporting

confidence: 62%

“…Similarly, Matharu (1994) has reported reductions in settlement when a geogrid was used in ballasted rail track. The field studies carried by Indraratna et al (2010) also confirmed the effectiveness of geosynthetics in augmenting the track performance. The geogrid reinforcement of ballast also reduces the extent of particle breakage (Indraratna et al 2006, andFernandes et al 2008).…”

Section: Introductionmentioning

confidence: 49%

“…Le Pen (2008), and Le Pen and Powrie (2011) have also reported similar values of confining pressure considering the effect of the shoulder ballast. Moreover, the field studies carried out by Indraratna et al (2010 and for a typical railway track (300 mm ballast depth), illustrated that the confining pressure of the ballast would remain almost constant along its depth. In this context, the application of lateral pressure of 10 kPa on the movable plates is realistic.…”

Section: Materials Used and The Testing Methodology Adoptedmentioning

confidence: 99%

See 2 more Smart Citations

A laboratory investigation to assess the functioning of railway ballast with and without geogrids

Hussaini

Indraratna

Vinod

2016

Transportation Geotechnics

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Understanding the complex load transfer mechanism and the subsequent accumulation of deformation in ballast and subballast layers under repeated wheel loading is essential to design resilient rail tracks. Large-scale cyclic tests have been conducted on railroad ballast instrumented with optical based fibre Bragg grating (FBG) sensors, LVDTs, pressure plates and the settlement pegs to explore the role of geogrid and its interaction with ballast in improving the track performance. Latite basalt and geogrids with different aperture sizes were used for the investigations. The laboratory experimental results indicate that the geogrid inclusions enhance track performance by arresting the lateral spreading of ballast and thereby significantly reducing the extent of its vertical settlement. In contrast, the reinforcement of ballast with geogrid has only a marginal effect on reducing the settlement in the subballast layer. The results also show that geogrid minimises the amount of particle breakage, the effectiveness of which is governed by its placement position, with lowest breakage occurring when the geogrid is placed at a location 130 mm above the subballast. In addition, geogrids also reduce the extent of vertical stress in the subgrade soil. The laboratory test results establish beyond doubt the effectiveness of FBG sensing system in capturing the ballast movement under cyclic loading. Disciplines Engineering | Science and Technology Studies

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Section: Vertical Settlement Of Ballast and Subballast Layerssupporting

confidence: 62%

Section: Introductionmentioning

confidence: 49%

Section: Materials Used and The Testing Methodology Adoptedmentioning

confidence: 99%

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A laboratory investigation to assess the functioning of railway ballast with and without geogrids

Hussaini

Indraratna

Vinod

2016

Transportation Geotechnics

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“…Particles of railroad ballast become degraded in railroad tracks under heavy cyclic loading, thereby increasing the overall compressibility (Anderson and Fair 2008;Lackenby et al 2007;Lu and McDowell 2006;Indraratna et al 2010a). The use of geosynthetics in railroad tracks has been studied in the past, and it has been proven that geosynthetics generally improve track performance by reducing the deformation and degradation of railroad ballast (Göbel et al 1994;Rowe and Jones 2000;Raymond 2002;Shin et al 2002;Brown et al 2007;Indraratna and Salim 2003;Indraratna et al 2006Indraratna et al , 2007.…”

Section: Introductionmentioning

confidence: 99%

Stress-Strain Degradation Response of Railway Ballast Stabilized with Geosynthetics

Indraratna

Nimbalkar

2013

J. Geotech. Geoenviron. Eng.

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143

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Large cyclic loading on ballasted railroad tracks is now inevitable owing to an increased demand for freight and public transport. This leads to a progressive deterioration and densification of railroad ballast and consequently to the loss of track geometry and differential settlement. Understanding these complex stressstrain and degradation mechanisms is essential to predict the desirable track maintenance cycle, as well as the design of new track. This paper presents the results of cyclic drained tests and numerical studies carried out on a segment of model railway track supported on geosynthetically reinforced railroad ballast bed. The relative performance and effectiveness of single-and dual-layer configurations of geosynthetic reinforcement was evaluated using a large-scale prismoidal triaxial chamber. Laboratory tests on unreinforced and reinforced railway track were simulated in a numerical model, and the results were then analyzed to better understand the distribution of displacements and stresses inside the railroad ballast layer. It was observed that in view of strain and breakage control, both the type of reinforcement and its layout played a vital role in improving the capacity of the track. These laboratory test findings were supported by the predictions from an advanced elastoplastic numerical analysis. Abstract: Large cyclic loading on ballasted railroad tracks is now inevitable owing to an increased demand for freight and public transport. This leads to a progressive deterioration and densification of railroad ballast and consequently to the loss of track geometry and differential settlement. Understanding these complex stress-strain and degradation mechanisms is essential to predict the desirable track maintenance cycle, as well as the design of new track. This paper presents the results of cyclic drained tests and numerical studies carried out on a segment of model railway track supported on geosynthetically reinforced railroad ballast bed. The relative performance and effectiveness of single-and dual-layer configurations of geosynthetic reinforcement was evaluated using a large-scale prismoidal triaxial chamber. Laboratory tests on unreinforced and reinforced railway track were simulated in a numerical model, and the results were then analyzed to better understand the distribution of displacements and stresses inside the railroad ballast layer. It was observed that in view of strain and breakage control, both the type of reinforcement and its layout played a vital role in improving the capacity of the track. These laboratory test findings were supported by the predictions from an advanced elastoplastic numerical analysis.

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“…The potential use of geosynthetics in the improvement of track stability and reducing the maintenance cost is well established. The reinforcement of the track by means of geogrids provides confinement to the ballast layer, leads to significant reduction in the vertical and lateral deformations, and assures more resilient long-term performance of the ballast layer (Indraratna and Salim, 2005;Indraratna et al, 2010a). The geocomposite provides reinforcement to the ballast layer, as well as filtration and separation functions simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Use of Geosynthetics in Railways Including Geocomposites and Vertical Drains

2011

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Field Assessment of the Performance of a Ballasted Rail Track with and without Geosynthetics

Cited by 216 publications

References 18 publications

A laboratory investigation to assess the functioning of railway ballast with and without geogrids

A laboratory investigation to assess the functioning of railway ballast with and without geogrids

Stress-Strain Degradation Response of Railway Ballast Stabilized with Geosynthetics

Use of Geosynthetics in Railways Including Geocomposites and Vertical Drains

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