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<p>To reveal the compression deformation characteristics of coal mine backfilling gangue under different working conditions, unconfined and supported compression tests were designed to systematically investigate the influence mechanisms of height-to-diameter ratio, loading stress, and support effects on gangue compression characteristics. Experimental results indicate that backfilled gangue undergoes three distinct stages during compression: “rapid compaction - slow growth - creep stabilization”. The residual height ratio exhibits a cubic functional relationship with the height-to-diameter ratio, demonstrating a “three-phase” evolutionary characteristic, while the diffusion ratio monotonically decreases with increasing height-to-diameter ratio, showing gradually diminishing reduction rates. Increased loading significantly accelerates particle fragmentation and structural reorganization processes in gangue, expanding the range of rapid compression phase. Under support conditions, the residual height ratio notably increases while the diffusion ratio decreases, indicating enhanced load-bearing capacity and deformation resistance. This research provides theoretical foundations for determining mechanical parameters in gangue backfilling mining and predicting overlying strata movement, holding significant engineering implications for controlling surface subsidence, protecting aquicludes, and promoting green mining practices in coal mines.</p>

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Experimental Study on Compression Deformation Characteristics of Coal Mine Backfilling Gangue under Different Conditions

  • 期刊论文

  • 发表日期：

    2026年6月17日

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  • Hao Hu,
  • Lian-qin Ni,
  • Chang-xiang Wang,
  • Bin Liu,
  • Ying-di Yang,
  • Jia-hao Wang

摘要

To reveal the compression deformation characteristics of coal mine backfilling gangue under different working conditions, unconfined and supported compression tests were designed to systematically investigate the influence mechanisms of height-to-diameter ratio, loading stress, and support effects on gangue compression characteristics. Experimental results indicate that backfilled gangue undergoes three distinct stages during compression: “rapid compaction - slow growth - creep stabilization”. The residual height ratio exhibits a cubic functional relationship with the height-to-diameter ratio, demonstrating a “three-phase” evolutionary characteristic, while the diffusion ratio monotonically decreases with increasing height-to-diameter ratio, showing gradually diminishing reduction rates. Increased loading significantly accelerates particle fragmentation and structural reorganization processes in gangue, expanding the range of rapid compression phase. Under support conditions, the residual height ratio notably increases while the diffusion ratio decreases, indicating enhanced load-bearing capacity and deformation resistance. This research provides theoretical foundations for determining mechanical parameters in gangue backfilling mining and predicting overlying strata movement, holding significant engineering implications for controlling surface subsidence, protecting aquicludes, and promoting green mining practices in coal mines.