Effectiveness of geogrid reinforcement in improvement of mechanical behavior of sand-contaminated ballast

Vertical stiffness and shear strength of ballasts are significantly degraded when contaminated with sands. There is a lack of solutions/studies related to strengthening ballast against sand contamination. Addressing this limitation, a comprehensive laboratory investigation was made on effectiveness...

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Published inGeotextiles and geomembranes Vol. 48; no. 6; pp. 768 - 779
Main Authors Sadeghi, Javad, Tolou Kian, Ali Reza, Ghiasinejad, Hossein, Fallah Moqaddam, Mosarreza, Motevalli, Sepehr
Format Journal Article
LanguageEnglish
Published Essex Elsevier Ltd 01.12.2020
Elsevier BV
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Abstract Vertical stiffness and shear strength of ballasts are significantly degraded when contaminated with sands. There is a lack of solutions/studies related to strengthening ballast against sand contamination. Addressing this limitation, a comprehensive laboratory investigation was made on effectiveness of geogrid reinforcement for improvement of mechanical properties of sand-contaminated ballast. To this end, large-scale direct shear tests as well as plate load tests were conducted on geogrid-reinforced ballast samples prepared with different levels of sand contamination. The obtained results indicate that geogrid reinforcement considerably improves shear strength and vertical stiffness of contaminated ballast. A bandwidth was obtained for contamination levels in which ballast reinforcement is effective. Through examining geogrid with different aperture sizes and locations in the ballast layer, the best performance conditions of geogrid reinforcement were derived. The results were used to propose an effective method of ballast reinforcement and an efficient ballast maintenance approach in sandy areas.
AbstractList Vertical stiffness and shear strength of ballasts are significantly degraded when contaminated with sands. There is a lack of solutions/studies related to strengthening ballast against sand contamination. Addressing this limitation, a comprehensive laboratory investigation was made on effectiveness of geogrid reinforcement for improvement of mechanical properties of sand-contaminated ballast. To this end, large-scale direct shear tests as well as plate load tests were conducted on geogrid-reinforced ballast samples prepared with different levels of sand contamination. The obtained results indicate that geogrid reinforcement considerably improves shear strength and vertical stiffness of contaminated ballast. A bandwidth was obtained for contamination levels in which ballast reinforcement is effective. Through examining geogrid with different aperture sizes and locations in the ballast layer, the best performance conditions of geogrid reinforcement were derived. The results were used to propose an effective method of ballast reinforcement and an efficient ballast maintenance approach in sandy areas.
Author Fallah Moqaddam, Mosarreza
Motevalli, Sepehr
Sadeghi, Javad
Ghiasinejad, Hossein
Tolou Kian, Ali Reza
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Issue 6
Keywords Shear strength
Plate load test
Sand contamination
Ballast
Geogrid
Railway track
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Snippet Vertical stiffness and shear strength of ballasts are significantly degraded when contaminated with sands. There is a lack of solutions/studies related to...
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elsevier
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StartPage 768
SubjectTerms Ballast
Concrete pavements
Contamination
Geogrid
Geogrids
Load tests
Mechanical properties
Plate load test
Railway track
Reinforcement
Sand
Sand contamination
Shear strength
Shear tests
Soil fertility
Stiffness
Studies
Title Effectiveness of geogrid reinforcement in improvement of mechanical behavior of sand-contaminated ballast
URI https://dx.doi.org/10.1016/j.geotexmem.2020.05.007
https://www.proquest.com/docview/2486865226
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