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Sd.K. Karimullah Hussaini¹, B. Indraratna² and J.S. Vinod³

¹Department of Civil and Environmental Engineering, Indian Institute of Technology-Patna, Bihar, India
²Faculty of Engineering and Information Sciences, Centre for Geomechanics and Railway Engineering, University of Wollongong, Australia
³Faculty of Engineering and Information Sciences, School of Civil, Mining and Environmental Engineering, University of Wollongong, Australia

doi:10.4203/ccp.104.125

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Sd.K. Karimullah Hussaini, B. Indraratna, J.S. Vinod, "An Experimental Investigation on the Deformation and Degradation Behaviour of Geogrid-Reinforced Ballast", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 125, 2014. doi:10.4203/ccp.104.125

Keywords: geogrid, ballast, lateral spread, vertical settlement, particle breakage, cyclic loading.

Summary

Railroad ballast, owing to its unbounded granular nature, spreads laterally when subjected to large vertical axle loads, which influences the track stability. In this view, large-scale cyclic tests have been conducted on ballast to explore the role of geogrid in controlling the lateral deformation of ballast and hence improving the track performance. Fresh latite ballast having a mean particle size of 35 mm and geogrids with different aperture sizes was used for the investigations. Tests were conducted using a modified process simulation test (MPST) apparatus at a loading frequency of 20 Hz, with geogrid placed at the subballast-ballast interface and within the ballast. The laboratory experimental results indicate that the geogrid arrests the lateral spreading of ballast, reduces the extent of permanent vertical settlement and minimises the particle breakage under high-frequency cyclic loading. However, the improvement in track performance is directly influenced by the effectiveness of the ballast-geogrid interface. It is shown that the higher the shear strength at the ballast-geogrid interface, the lower is the deformation and degradation of ballast. In addition, the geogrid also reduces the extent of vertical stress in the subgrade soil. These test results highlight the role of geogrid in stabilising the ballast thus encouraging its use as track reinforcement in railway applications.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 104 PROCEEDINGS OF THE SECOND INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 125 An Experimental Investigation on the Deformation and Degradation Behaviour of Geogrid-Reinforced Ballast Sd.K. Karimullah Hussaini¹, B. Indraratna² and J.S. Vinod³ ¹Department of Civil and Environmental Engineering, Indian Institute of Technology-Patna, Bihar, India ²Faculty of Engineering and Information Sciences, Centre for Geomechanics and Railway Engineering, University of Wollongong, Australia ³Faculty of Engineering and Information Sciences, School of Civil, Mining and Environmental Engineering, University of Wollongong, Australia doi:10.4203/ccp.104.125 purchase the full-text of this paper Full Bibliographic Reference for this paper Sd.K. Karimullah Hussaini, B. Indraratna, J.S. Vinod, "An Experimental Investigation on the Deformation and Degradation Behaviour of Geogrid-Reinforced Ballast", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 125, 2014. doi:10.4203/ccp.104.125 Keywords: geogrid, ballast, lateral spread, vertical settlement, particle breakage, cyclic loading. Summary Railroad ballast, owing to its unbounded granular nature, spreads laterally when subjected to large vertical axle loads, which influences the track stability. In this view, large-scale cyclic tests have been conducted on ballast to explore the role of geogrid in controlling the lateral deformation of ballast and hence improving the track performance. Fresh latite ballast having a mean particle size of 35 mm and geogrids with different aperture sizes was used for the investigations. Tests were conducted using a modified process simulation test (MPST) apparatus at a loading frequency of 20 Hz, with geogrid placed at the subballast-ballast interface and within the ballast. The laboratory experimental results indicate that the geogrid arrests the lateral spreading of ballast, reduces the extent of permanent vertical settlement and minimises the particle breakage under high-frequency cyclic loading. However, the improvement in track performance is directly influenced by the effectiveness of the ballast-geogrid interface. It is shown that the higher the shear strength at the ballast-geogrid interface, the lower is the deformation and degradation of ballast. In addition, the geogrid also reduces the extent of vertical stress in the subgrade soil. These test results highlight the role of geogrid in stabilising the ballast thus encouraging its use as track reinforcement in railway applications. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £65 +P&P)
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