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<p>This study aims to elucidate the structural deterioration and instability mechanisms of marble specimens containing double fissures under disturbed stress conditions. To achieve this, a specially designed increasing-amplitude fatigue loading test, combined with real-time acoustic emission (AE) monitoring, was conducted to examine the influence of rock bridge length on the macro- and meso-scale fracture behavior and instability mechanisms of the specimens. The results indicate that as the rock bridge length increases, the mechanical properties of the specimens improve. Furthermore, longer rock bridges correspond to higher AE ring counts and AE energy, suggesting a direct correlation between AE spectrum characteristics and crack evolution. The cumulative AE energy damage model reveals three distinct failure stages, while the <i>b</i>-value characteristics exhibit a trend like that of the axial incremental strain per cycle. These findings provide a crucial theoretical foundation for the early warning and assessment of engineering rock masses subjected to fatigue loading conditions.</p>

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Fatigue Damage Behavior and Acoustic Emission Response of Marble with Stepped Fissures Under Increasing-Amplitude Loading

  • 期刊论文

  • 发表日期：

    2025年10月31日

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  • Juzhou Li,
  • Yu Wang,
  • Changhong Li,
  • Abbas Taheri,
  • Xuefeng Yi,
  • Yongyue Hu

摘要

This study aims to elucidate the structural deterioration and instability mechanisms of marble specimens containing double fissures under disturbed stress conditions. To achieve this, a specially designed increasing-amplitude fatigue loading test, combined with real-time acoustic emission (AE) monitoring, was conducted to examine the influence of rock bridge length on the macro- and meso-scale fracture behavior and instability mechanisms of the specimens. The results indicate that as the rock bridge length increases, the mechanical properties of the specimens improve. Furthermore, longer rock bridges correspond to higher AE ring counts and AE energy, suggesting a direct correlation between AE spectrum characteristics and crack evolution. The cumulative AE energy damage model reveals three distinct failure stages, while the b-value characteristics exhibit a trend like that of the axial incremental strain per cycle. These findings provide a crucial theoretical foundation for the early warning and assessment of engineering rock masses subjected to fatigue loading conditions.