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<p>To investigate the evolution of soil arching in geosynthetic-reinforced pile-supported embankments, this study used PFC2D to establish discrete element models of two-dimensional trapdoor tests, based on the existing literature. Through parameter calibration, the mesoscopic parameters of the soil and geosynthetic materials were determined. Simulations conducted using these parameters demonstrated close agreement with the experimental results. Subsequently, the evolution of the soil arching effect was investigated, followed by a detailed parametric study. The results show that: (1) The soil arching effect in the embankment gradually increased as the trapdoor moved downward, eventually forming a stable soil arching structure. (2) As <i>Δd</i> increased, the vertical stress on the pile cap at the same horizontal position increased, while the vertical stress between piles decreased, leading to a gradual transfer of embankment load to the adjacent pile caps. (3) Linear regression fitting indicated a significant linear relationship between the normalized displacement and the pile-soil stress ratio. (4) As the normalized displacement increased, the soil arching ratio within the embankment increased. Increasing the normalized pile cap width or geosynthetic stiffness further enhanced the soil arching effect.</p>

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Discrete Element Method Analysis of Soil Arching Evolution in Geosynthetic-Reinforced Pile-Supported Embankments

  • 期刊论文

  • 发表日期：

    2026年2月16日

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  • Long Zhang,
  • Hangchuan Shi,
  • Yuchi Jianie,
  • Linjie Hu

摘要

To investigate the evolution of soil arching in geosynthetic-reinforced pile-supported embankments, this study used PFC2D to establish discrete element models of two-dimensional trapdoor tests, based on the existing literature. Through parameter calibration, the mesoscopic parameters of the soil and geosynthetic materials were determined. Simulations conducted using these parameters demonstrated close agreement with the experimental results. Subsequently, the evolution of the soil arching effect was investigated, followed by a detailed parametric study. The results show that: (1) The soil arching effect in the embankment gradually increased as the trapdoor moved downward, eventually forming a stable soil arching structure. (2) As Δd increased, the vertical stress on the pile cap at the same horizontal position increased, while the vertical stress between piles decreased, leading to a gradual transfer of embankment load to the adjacent pile caps. (3) Linear regression fitting indicated a significant linear relationship between the normalized displacement and the pile-soil stress ratio. (4) As the normalized displacement increased, the soil arching ratio within the embankment increased. Increasing the normalized pile cap width or geosynthetic stiffness further enhanced the soil arching effect.