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<p>It is common that the underground filling mine stopes are always encountered with disturbed stress, and the rock–backfill composite structure (RBCS) material is exposed to dynamic disturbance stress conditions. To understand the impact of cyclic disturbed frequency (CDF) on the damage and failure characteristics of RBCS, a series of multi-stage cyclic loading experiments were conducted on cylindrical RBCS specimens with different CDFs, combined with real-time acoustic emission monitoring and post-test CT scanning. The experimental results show that volumetric strain and AE events increase with increasing CDF. The AE signals characterized with high-amplitude and high-frequency increase with CDF, the wider of low-frequency band increases accordingly. In addition, the tensile cracking and shear/mixed cracking mode is well classified, it is found that the tensile cracking mode plays a dominant role for RBCS under low-frequency stress disturbance condition and shear cracking mode is dominant for RBCS under high-frequency condition. Moreover, post-test CT images reveal the differential cracking pattern, the percentage of the tensile cracks decreases and shear/mixed cracks increases with increasing cyclic disturbed frequency.</p>

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The Effect of Cyclic Disturbed Frequency on Mechanical, Acoustic Emission and Crack Pattern for Rock–Backfill Composites Exposed to Fatigue Loading Condition

  • 期刊论文

  • 发表日期：

    2025年3月13日

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  • Yu Wang,
  • Zhenzhen Chen,
  • Yingjie Xia,
  • Peng Li,
  • Meifeng Cai

摘要

It is common that the underground filling mine stopes are always encountered with disturbed stress, and the rock–backfill composite structure (RBCS) material is exposed to dynamic disturbance stress conditions. To understand the impact of cyclic disturbed frequency (CDF) on the damage and failure characteristics of RBCS, a series of multi-stage cyclic loading experiments were conducted on cylindrical RBCS specimens with different CDFs, combined with real-time acoustic emission monitoring and post-test CT scanning. The experimental results show that volumetric strain and AE events increase with increasing CDF. The AE signals characterized with high-amplitude and high-frequency increase with CDF, the wider of low-frequency band increases accordingly. In addition, the tensile cracking and shear/mixed cracking mode is well classified, it is found that the tensile cracking mode plays a dominant role for RBCS under low-frequency stress disturbance condition and shear cracking mode is dominant for RBCS under high-frequency condition. Moreover, post-test CT images reveal the differential cracking pattern, the percentage of the tensile cracks decreases and shear/mixed cracks increases with increasing cyclic disturbed frequency.