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<p>Geosynthetics are increasingly being considered as a sustainable alternative in railway ballast stabilisation. In this paper, the effectiveness of planar geogrid reinforcement is explored with suitable comparisons performed with geocells under cyclic loading conditions, where the latter provides more all-around confinement. Finite element simulations are performed over long-term cyclic loading conditions using a realistic 3D (three-dimensional) railway model with typical standard track geometries. Model validation is performed against existing controlled cyclic testing data on typical railway ballast. A weak undrained clay subgrade found typically in the coastal regions is modelled with a low unconfined compressive strength (UCS). A commercial geogrid (TX190L) with a triangular opening of 60&#xa0;mm is used. The geocell modelled had a typical height of 150&#xa0;mm. The geogrid placement depth as well as the number of geogrid layers are varied with track and subgrade complete settlement profile, stresses, and lateral ballast spreading potential assessed with performance compared with geocells. It is shown that the geogrids provide substantial benefit in increasing track performance with the track and subgrade settlement reducing about 20%, with a 10% decrease in ballast lateral deformation. The performance is improved with two geogrid layers placed within the ballast with appropriate clearances. A single layer geocell placed on the subgrade was found to outperform both single- and double-layer geogrid cases, under all conditions studied.</p>

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A Relative Performance Assessment of Geocells and Geogrids in Stabilising Railway Ballast over Soft Clay Subgrade

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月15日

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  • Rufaida Zikria,
  • Shah Neyamat Ullah

摘要

Geosynthetics are increasingly being considered as a sustainable alternative in railway ballast stabilisation. In this paper, the effectiveness of planar geogrid reinforcement is explored with suitable comparisons performed with geocells under cyclic loading conditions, where the latter provides more all-around confinement. Finite element simulations are performed over long-term cyclic loading conditions using a realistic 3D (three-dimensional) railway model with typical standard track geometries. Model validation is performed against existing controlled cyclic testing data on typical railway ballast. A weak undrained clay subgrade found typically in the coastal regions is modelled with a low unconfined compressive strength (UCS). A commercial geogrid (TX190L) with a triangular opening of 60 mm is used. The geocell modelled had a typical height of 150 mm. The geogrid placement depth as well as the number of geogrid layers are varied with track and subgrade complete settlement profile, stresses, and lateral ballast spreading potential assessed with performance compared with geocells. It is shown that the geogrids provide substantial benefit in increasing track performance with the track and subgrade settlement reducing about 20%, with a 10% decrease in ballast lateral deformation. The performance is improved with two geogrid layers placed within the ballast with appropriate clearances. A single layer geocell placed on the subgrade was found to outperform both single- and double-layer geogrid cases, under all conditions studied.