You Chunlin, Hu Jianhua, Li Jianing, Zhang Jiwei, Qi Zhonghua
Zijin School of Geology and Mining, Fuzhou University, Fuzhou, 350108, Fujian, China.
College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, Fujian, China.
Sci Rep. 2025 Jul 21;15(1):26420. doi: 10.1038/s41598-025-11280-8.
Significant hanging wall exposure in stopes of underground iron mines with inclined orebodies affects mine safety and efficiency. An extended Mathews stability graph method, combined with numerical simulations, was employed to evaluate stope stability. Rock mass quality was assessed using the RMR grading system and Q' values. Stability probabilities were determined by fitting stability isoprobability lines on the Mathews stability graph and analyzing exposure time, along with FLAC modeling to analyze the mechanical response of different exposure areas. The results showed that the expanded Mathews stability graph could determine the stability probability of various exposure areas. Increasing the stope length under the same exposure area improved stress distribution and reduced plastic destruction. Reducing exposure time enhanced stope stability. Numerical simulations suggested optimal exposure areas and structural parameters: 30 m × 15 m and 40 m × 12.5 m, with a maximum exposure time of 3 months and corresponding limit exposure areas of 450 m and 500 m, respectively. These findings effectively improved the stability and safety of the stopes.
在有倾斜矿体的地下铁矿采场中，上盘的大面积暴露会影响矿山安全和效率。采用扩展的马修斯稳定性图表法，并结合数值模拟，来评估采场稳定性。利用RMR分级系统和Q'值评估岩体质量。通过在马修斯稳定性图表上拟合稳定性等概率线并分析暴露时间来确定稳定概率，同时利用FLAC建模分析不同暴露区域的力学响应。结果表明，扩展的马修斯稳定性图表能够确定各个暴露区域的稳定概率。在相同暴露面积下增加采场长度可改善应力分布并减少塑性破坏。减少暴露时间可增强采场稳定性。数值模拟给出了最佳暴露面积和结构参数：30米×15米和40米×12.5米，最大暴露时间分别为3个月，相应的极限暴露面积分别为450平方米和500平方米。这些研究结果有效提高了采场的稳定性和安全性。
