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Based on the open-pit to underground mining transition scenario at Xujiagou Iron Mine, this study conducts optimization analysis of stope structural parameters using the Mathews stability graph method and its modified models. Through the modified Trueman-Mawdesley stability graph method, we calculate stability number (N) and hydraulic radius (S) by incorporating rock mass quality index (Q’), stress coefficient (A), joint orientation adjustment coefficient (B), and gravity adjustment coefficient (C), thereby evaluating stability under different stope dimensions.The results indicate that the rock mass quality Q’ of the mining area is 48, with roof stability being the critical control factor when stopes are arranged perpendicular to the orebody strike. Analysis of different span-length combinations (15 m/18 m/20 m spans vs. 60 m/90 m/120 m lengths) reveals that when the stope width is 15 m and length ≤ 140 m, the N-values satisfy the stability boundary condition (lnN = 1.95lnS-2.041), with the roof hydraulic radius S threshold below the critical value of 6.78, ensuring controllable stability. However, stability deteriorates significantly when widths exceed 18 m. Additionally, tectonic stress and gravity adjustment coefficients show minimal impacts on sidewall and end stability.The optimized parameters recommend perpendicular stope arrangement relative to the orebody strike, with 15 m width and ≤ 140 m length, balancing safety and resource recovery efficiency. This research provides theoretical and practical references for stope parameter optimization in similar mining transition projects.

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Research on Optimization of Stope Structural Parameters for Open-Pit to Underground Mining Transition Based on Mathews Stability Graph Method

  • 会议论文

  • 发表日期：

    2026年

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  • Minghui Gao,
  • Yanchao Shi,
  • Jingyao Chen,
  • Jibo Su,
  • Yue Guo,
  • Xiaolin Xing

摘要

Based on the open-pit to underground mining transition scenario at Xujiagou Iron Mine, this study conducts optimization analysis of stope structural parameters using the Mathews stability graph method and its modified models. Through the modified Trueman-Mawdesley stability graph method, we calculate stability number (N) and hydraulic radius (S) by incorporating rock mass quality index (Q’), stress coefficient (A), joint orientation adjustment coefficient (B), and gravity adjustment coefficient (C), thereby evaluating stability under different stope dimensions.The results indicate that the rock mass quality Q’ of the mining area is 48, with roof stability being the critical control factor when stopes are arranged perpendicular to the orebody strike. Analysis of different span-length combinations (15 m/18 m/20 m spans vs. 60 m/90 m/120 m lengths) reveals that when the stope width is 15 m and length ≤ 140 m, the N-values satisfy the stability boundary condition (lnN = 1.95lnS-2.041), with the roof hydraulic radius S threshold below the critical value of 6.78, ensuring controllable stability. However, stability deteriorates significantly when widths exceed 18 m. Additionally, tectonic stress and gravity adjustment coefficients show minimal impacts on sidewall and end stability.The optimized parameters recommend perpendicular stope arrangement relative to the orebody strike, with 15 m width and ≤ 140 m length, balancing safety and resource recovery efficiency. This research provides theoretical and practical references for stope parameter optimization in similar mining transition projects.