Geosynthetic-Reinforced Soils Under Repeated Loading: A Review and Comparative Design Study

Ashmawy, Alaa K.; Bourdeau, Philippe

doi:10.1680/gein.2.0029

Cited by 27 publications

(15 citation statements)

References 21 publications

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“…section 3 and section 5) were compared, it was observed that the effectiveness of a geogrid to reduce track settlement became higher for softer subgrades (Figure 5(a) and (b)). This observation is in agreement with the results of full-scale tests presented by Ashmawy and Bourdeau (1995). It was also observed that among the four types of geosynthetic used, the geogrid at section 3 performed most effectively.…”

Section: Vertical Deformations Of Ballastsupporting

confidence: 91%

Performance assessment of reinforced ballasted rail track

Indraratna

Nimbalkar

Neville³

2014

Proceedings of the Institution of Civil Engineers - Ground Impr

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In coastal Australia, high population density and increased traffic volumes have promoted rapid expansion of urban transportation infrastructure including railways. Coastal soft clays pose significant construction challenges. Therefore, the search for innovative ground improvement techniques imperative for more resilient and sustainable transport infrastructure has become an obvious priority in research and development. Use of artificial inclusions such as polymeric geosynthetics and energy-absorbing shock mats is described in this paper as a suitable alternative for reducing unacceptable track degradation and for ensuring sustainable track alignment. An extensive monitoring programme was undertaken on fully instrumented track sections constructed near Singleton, New South Wales, Australia. Four types of geosynthetics were installed at the ballast-capping interface of track sections located on different types of subgrades. It was found that geogrids could decrease the vertical settlement of the ballast layer with the obvious benefits of improved track stability and decreased cost of maintenance. It was also found that the effectiveness of reinforcing geogrids is greater when the subgrade is soft. Notation

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Section: Vertical Deformations Of Ballastsupporting

confidence: 91%

Performance assessment of reinforced ballasted rail track

Indraratna

Nimbalkar

Neville³

2014

Proceedings of the Institution of Civil Engineers - Ground Impr

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“…When the results for sections with similar geogrids are compared, it is observed that the effectiveness of a geogrid to reduce track settlement becomes higher for softer subgrades. This observation is in agreement with previous study by Ashmawy and Bourdeau [35].…”

Section: Vertical Strains In Ballastsupporting

confidence: 94%

Modernisation of Rail Tracks for Higher Speeds and Greater Freight

Indraratna¹,

Nimbalkar²,

Rujikiatkamjorn³

2013

Int J Railw Tech

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An efficient transportation infrastructure has become utmost priority for global economic reforms. Railways are designed to provide high speed passenger and heavy haul freight transportation. Ballast is one of important constituents of the rail track however, it experiences excessive deformation and degradation from trains operating at high speeds. In addition, tracks built along coastal areas often undergo large settlements due to soft compressible clay deposits. This leads to progressive track deterioration and necessitates frequent and costly track maintenance. The use of artificial inclusions such as geogrids, geocomposites, shock mats and prefabricated vertical drains (PVDs) is often an attractive design alternative for track practitioners. However performances of these inclusions are predominantly governed by their technical specifications in addition to geotechnical characterization of the track substructure including ballast and subgrade. Therefore, full scale field trials were conducted on instrumented track sections built along the south-east coast of Australia (e.g. Bulli and Singleton). The performance of geogrids and geocomposite was demonstrated in terms of specific key parameters such as stiffness and aperture size of geogrids, placement location of geogrids, as well as subgrade types. Placement of shock mats (rubber pads) in rail tracks has also lead to the mitigation of particle breakage. Empirical approaches to relate ballast strains with the number of load cycles are presented. Bearing capacity analyses of track substructure is discussed. The use of PVDs to dissipate the excess pore pressure for increased stability of the soft clay subgrade is presented. AbstractAn efficient transportation infrastructure has become utmost priority for global economic reforms. Railways are designed to provide high speed passenger and heavy haul freight transportation. Ballast is one of important constituents of the rail track however, it experiences excessive deformation and degradation from trains operating at high speeds. In addition, tracks built along coastal areas often undergo large settlements due to soft compressible clay deposits. This leads to progressive track deterioration and necessitates frequent and costly track maintenance. The use of artificial inclusions such as geogrids, geocomposites, shock mats and prefabricated vertical drains (PVDs) is often an attractive design alternative for track practitioners. However performances of these inclusions are predominantly governed by their technical specifications in addition to geotechnical characterization of the track substructure including ballast and subgrade. Therefore, full scale field trials were conducted on instrumented track sections built along the south-east coast of Australia (e.g. Bulli and Singleton). The performance of geogrids and geocomposite was demonstrated in terms of specific key parameters such as stiffness and aperture size of geogrids, placement location of geogrids, as well as subgrade types. Placement of shock mats (r...

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“…Such an observation is in agreement with the results of full-scale tests presented by Ashmawy and Bourdeau (1995). It is also observed that among the four synthetic types used TerraGrid performed most effectively.…”

Section: Settlements Of Ballast Layersupporting

confidence: 91%

Effects of Geosynthetic Reinforcement on Performance of Ballasted Rail Track

Anantanasakul¹,

Indraratna²,

Nimbalkar³

et al. 2012

Proceedings of the International Conference on Ground Improvement &Amp; Ground Control

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The 'field' performance of different geosynthetics to reinforce ballasted rail tracks was investigated. An extensive monitoring program was undertaken on fully instrumented track sections constructed near Singleton, New South Wales. Four types of geosynthetics were installed at the ballast-subballast interface of track sections located on subgrades with three distinctly different values of stiffness. It was found that geogrids could decrease vertical settlements of the ballast layer with obvious benefits of improved track stability and decreased maintenance cost. It was also found that the effectiveness of reinforcing geogrids increased when the subgrade stiffness decreased. Keywords: Geosynthetic, Reinforcement, Rail track, Ballast. The 'field' performance of different geosynthetics to reinforce ballasted rail tracks was investigated. An extensive monitoring program was undertaken on fully instrumented track sections constructed near Singleton, New South Wales. Four types of geosynthetics were installed at the ballast-subballast interface of track sections located on subgrades with three distinctly different values of stiffness. It was found that geogrids could decrease vertical settlements of the ballast layer with obvious benefits of improved track stability and decreased maintenance cost. It was also found that the effectiveness of reinforcing geogrids increased when the subgrade stiffness decreased. EFFECTS OF GEOSYNTHETIC REINFORCEMENT ON PERFORMANCE OF BALLASTED RAIL TRACK

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Geosynthetic-Reinforced Soils Under Repeated Loading: A Review and Comparative Design Study

Cited by 27 publications

References 21 publications

Performance assessment of reinforced ballasted rail track

Performance assessment of reinforced ballasted rail track

Modernisation of Rail Tracks for Higher Speeds and Greater Freight

Effects of Geosynthetic Reinforcement on Performance of Ballasted Rail Track

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