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<p>The dynamic performance of embankments supported by jet grout columns (JGCs) and reinforced with geosynthetics (GRJGE) was investigated and compared to piled-supported (GRPS) systems. An extensive 3D finite element parametric study analyzed the load transfer mechanisms under moving train loads. Key geometric, material, and loading parameters including column spacing, embankment height and train velocity were varied. Due to the lower stiffness of JGCs, the GRJGE system consistently exhibited a less efficient soil arching mechanism, resulting in a significantly higher load percentage (over 20% more) being transferred to the geosynthetic reinforcement compared to the GRPS system. Harmonic loading consistently resulted in lower cumulative settlements than linear dynamic loading, an effect more pronounced in the flexible GRJGE system (up to 22% reduction). While train velocity was found to have a negligible impact on the geosynthetic load share for both GRPS and GRJGE systems, it significantly affects settlement. Higher velocities lead to a reduction in settlement. The geosynthetic load share percentage remained largely independent of the dynamic load magnitude. An optimal spacing for JGCs was identified at 2&#xa0;m, as wider spacings led to inefficient arching. These findings provide a quantitative basis for designing railway embankments on soft ground using this JGCs technology.</p>

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Dynamic Response of Geosynthetic-Reinforced Embankments on Jet Grout Columns Subjected To Moving Train Loads

  • 期刊论文

  • 发表日期：

    2026年2月16日

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  • Zaman Barem,
  • Hamed Bayesteh

摘要

The dynamic performance of embankments supported by jet grout columns (JGCs) and reinforced with geosynthetics (GRJGE) was investigated and compared to piled-supported (GRPS) systems. An extensive 3D finite element parametric study analyzed the load transfer mechanisms under moving train loads. Key geometric, material, and loading parameters including column spacing, embankment height and train velocity were varied. Due to the lower stiffness of JGCs, the GRJGE system consistently exhibited a less efficient soil arching mechanism, resulting in a significantly higher load percentage (over 20% more) being transferred to the geosynthetic reinforcement compared to the GRPS system. Harmonic loading consistently resulted in lower cumulative settlements than linear dynamic loading, an effect more pronounced in the flexible GRJGE system (up to 22% reduction). While train velocity was found to have a negligible impact on the geosynthetic load share for both GRPS and GRJGE systems, it significantly affects settlement. Higher velocities lead to a reduction in settlement. The geosynthetic load share percentage remained largely independent of the dynamic load magnitude. An optimal spacing for JGCs was identified at 2 m, as wider spacings led to inefficient arching. These findings provide a quantitative basis for designing railway embankments on soft ground using this JGCs technology.