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<p>The inclusion of granular columns was a widely adopted ground improvement technique to enhance the stability and performance of the embankments constructed on soft ground. However, the research focusing on the role of granular columns in improving the performance of railway embankment resting on soft soil profiles under train loading conditions, particularly considering the effects of sequential layer of embankment construction was very much limited. To address this research gap, the present study develops two-dimensional finite element (<i>FE</i>) model under an axisymmetric unit cell framework and validates its results using the field data. Further, the developed <i>FE</i> model investigated the influence of different column arrangements, the effect of geosynthetic encapsulation, and variations in centre-to-centre column spacing on settlement control and load-bearing capacity throughout the construction, post-construction, and operational (train loading) stages. The model applies an equivalent moving train load with axle loads of 25 and 35 tonnes, travelling at speeds ranging from 40 to 160&#xa0;km/h, at the crest of the embankment to evaluate the response of improved soft ground after the post-construction stage. The calculation of the equivalent dynamic load methods incorporates a dynamic amplification factor (<i>DAF</i>) derived from the field experiments.</p>

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Performance of Railway Embankment on Soft Ground Reinforced with Granular Columns

  • 期刊论文

  • 发表日期：

    2025年7月31日

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  • Anandha Raj Lenin Kumar,
  • Sanjay Nimbalkar,
  • G R Dodagoudar

摘要

The inclusion of granular columns was a widely adopted ground improvement technique to enhance the stability and performance of the embankments constructed on soft ground. However, the research focusing on the role of granular columns in improving the performance of railway embankment resting on soft soil profiles under train loading conditions, particularly considering the effects of sequential layer of embankment construction was very much limited. To address this research gap, the present study develops two-dimensional finite element (FE) model under an axisymmetric unit cell framework and validates its results using the field data. Further, the developed FE model investigated the influence of different column arrangements, the effect of geosynthetic encapsulation, and variations in centre-to-centre column spacing on settlement control and load-bearing capacity throughout the construction, post-construction, and operational (train loading) stages. The model applies an equivalent moving train load with axle loads of 25 and 35 tonnes, travelling at speeds ranging from 40 to 160 km/h, at the crest of the embankment to evaluate the response of improved soft ground after the post-construction stage. The calculation of the equivalent dynamic load methods incorporates a dynamic amplification factor (DAF) derived from the field experiments.