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<p>With global coal mining rapidly and continuously extending to kilometer-deep underground with high in-situ stress, rockburst has become the most critical dynamic hazard severely restricting safe and efficient extraction of deep coal resources. The residual isolated coal pillar between adjacent longwall panels forms a high-energy concentration body under mining-induced stress superposition, while systematic safety evaluation for panel expansion and remining in such strong burst-prone deep mining conditions remains insufficient in academic research and engineering practice. Taking the 1301 expanded remining panel of a kilometer-deep coal mine in Shandong Province, China as the engineering background, this study adopts integrated methods of theoretical mechanical analysis, 3D numerical simulation and field microseismic monitoring to investigate the stress superposition mechanism, overburden movement law, and quantitatively evaluate the rockburst risk of the 80&#xa0;m isolated coal pillar throughout the full remining cycle. The results show that the coal pillar bears coupled static load from goaf lateral abutment pressure and dynamic load from remining face advance abutment pressure, with the stress superposition zone fully concentrated within the coal pillar. The total stress on the pillar exceeds 3 times the coal’s uniaxial compressive strength, presenting strong overall burst risk. Overburden movement height and abutment pressure peak reach the maximum at 400&#xa0;m advance, showing a strong coupling relationship. Field microseismic monitoring further supported the spatial distribution and temporal evolution of the identified burst-risk zones. This study provides critical theoretical support and engineering reference for safe residual coal remining and rockburst prevention in similar deep high-stress coal mines.</p>

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Safety research on the original coal pillar area during expansion and remining of strong rockburst-prone panels in kilometer-deep coal mines

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月3日

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  • Dong Li,
  • Junfei Zhang,
  • Jiaxiang Li

摘要

With global coal mining rapidly and continuously extending to kilometer-deep underground with high in-situ stress, rockburst has become the most critical dynamic hazard severely restricting safe and efficient extraction of deep coal resources. The residual isolated coal pillar between adjacent longwall panels forms a high-energy concentration body under mining-induced stress superposition, while systematic safety evaluation for panel expansion and remining in such strong burst-prone deep mining conditions remains insufficient in academic research and engineering practice. Taking the 1301 expanded remining panel of a kilometer-deep coal mine in Shandong Province, China as the engineering background, this study adopts integrated methods of theoretical mechanical analysis, 3D numerical simulation and field microseismic monitoring to investigate the stress superposition mechanism, overburden movement law, and quantitatively evaluate the rockburst risk of the 80 m isolated coal pillar throughout the full remining cycle. The results show that the coal pillar bears coupled static load from goaf lateral abutment pressure and dynamic load from remining face advance abutment pressure, with the stress superposition zone fully concentrated within the coal pillar. The total stress on the pillar exceeds 3 times the coal’s uniaxial compressive strength, presenting strong overall burst risk. Overburden movement height and abutment pressure peak reach the maximum at 400 m advance, showing a strong coupling relationship. Field microseismic monitoring further supported the spatial distribution and temporal evolution of the identified burst-risk zones. This study provides critical theoretical support and engineering reference for safe residual coal remining and rockburst prevention in similar deep high-stress coal mines.