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This study investigates the plastic shakedown limit of railroad ballast, a critical parameter for long-term performance under cyclic loading. A series of eight triaxial tests on 150 × 300 mm specimens, replicating particle size distribution according to AREMA No. 4 standards, was conducted. The results reveal a significant dependence of the shakedown limit on both stress ratio and confining stress. Consequently, a confining stress-dependent shakedown limit is proposed. This approach aligns well with findings from PFC2D simulations reported in literature. The established shakedown limit offers a valuable tool for railway pavement designers, enabling them to evaluate material behavior under variable loading scenarios, transcending the limitations of single stress state analysis.

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Analysis of the Deformability of Railroad Ballast Based on the Concept of the Shakedown Limit

  • 会议论文

  • 发表日期：

    2025年

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  • Maelckson Bruno Barros Gomes,
  • Antonio Carlos Rodrigues Guimarães,
  • Juliana Tanabe Assad dos Santos,
  • Filipe Almeida Corrêa do Nascimento

摘要

This study investigates the plastic shakedown limit of railroad ballast, a critical parameter for long-term performance under cyclic loading. A series of eight triaxial tests on 150 × 300 mm specimens, replicating particle size distribution according to AREMA No. 4 standards, was conducted. The results reveal a significant dependence of the shakedown limit on both stress ratio and confining stress. Consequently, a confining stress-dependent shakedown limit is proposed. This approach aligns well with findings from PFC2D simulations reported in literature. The established shakedown limit offers a valuable tool for railway pavement designers, enabling them to evaluate material behavior under variable loading scenarios, transcending the limitations of single stress state analysis.