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<p>Roof stability in underground Room &amp; Pillar (R&amp;P) coal mines remains a critical safety concern, particularly during panel development stage. Roof collapses often result in fatal accidents, making design of an appropriate support system a major primary concern. This technical note focuses on a case study conducted in Raniganj Coalfield, West Bengal, India, using an integrated approach of empirical and numerical methods to assess the concerned roof stability problems. The Central Mining Research Institute-Indian School of Mines Rock Mass Rating (CMRI-ISM-RMR) system was employed in combination with two-dimensional numerical simulation using FLAC2D to evaluate pillar strength, unstable roof heights, and rock loads, which were then used to design an optimized roof support system. By combining these two established methodologies, this work aims to provide a robust framework for improving operational safety in underground coal mining in India. The numerically determined peak pillar strength was validated with empirical formulations, and further analysis revealed an unstable roof height of 1.7&#xa0;m and a corresponding rock load of 41.5&#xa0;kPa in the gallery roadway, which was in agreement with the empirical results. Findings from this case study align closely with empirical estimates, confirming the reliability of the numerical model in replicating field conditions. Furthermore, extending this method enables the simulation of mining-induced stresses during retreat mining operations, providing practical insights for implementing safer and more efficient mining practices.</p>

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Stability Analysis and Roof Support Design in Underground Room & Pillar Coal Mines: A Case Study from Raniganj Coalfield, India

  • 期刊论文

  • 发表日期：

    2025年1月12日

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  • Nisheeth Shekhar,
  • Supriya Pal,
  • Sudipta Ghosh

摘要

Roof stability in underground Room & Pillar (R&P) coal mines remains a critical safety concern, particularly during panel development stage. Roof collapses often result in fatal accidents, making design of an appropriate support system a major primary concern. This technical note focuses on a case study conducted in Raniganj Coalfield, West Bengal, India, using an integrated approach of empirical and numerical methods to assess the concerned roof stability problems. The Central Mining Research Institute-Indian School of Mines Rock Mass Rating (CMRI-ISM-RMR) system was employed in combination with two-dimensional numerical simulation using FLAC2D to evaluate pillar strength, unstable roof heights, and rock loads, which were then used to design an optimized roof support system. By combining these two established methodologies, this work aims to provide a robust framework for improving operational safety in underground coal mining in India. The numerically determined peak pillar strength was validated with empirical formulations, and further analysis revealed an unstable roof height of 1.7 m and a corresponding rock load of 41.5 kPa in the gallery roadway, which was in agreement with the empirical results. Findings from this case study align closely with empirical estimates, confirming the reliability of the numerical model in replicating field conditions. Furthermore, extending this method enables the simulation of mining-induced stresses during retreat mining operations, providing practical insights for implementing safer and more efficient mining practices.