Abstract:
In underground metal mining, the rational selection of stope structure parameters is crucial to ensure mining safety. Based on the Mohr-Coulomb criterion, the Mathews stability diagram method is modified, and a new rock stress coefficient
Aʹ is proposed, which can better reflect the rock failure degree under different stress states. For the special geological conditions of the −530 m middle section ore body in Xincheng Gold Mine, where the fault structure is significantly developed and the rock strata are relatively fragmented, the improved Mathews stability diagram method is adopted to determine the optimal structure parameters of the stope. The calculation results show that the best span is 9 m when the stope length is 20 m. To further verify the reliability of the improved Mathews stability diagram method, FLAC
3D numerical simulation software is used to conduct a thorough analysis of the stress distribution, displacement, and plastic zone in the stope. The simulation results are highly consistent with the calculation results of the improved Mathews stability diagram method, confirming the scientificity and rationality of the determined structural parameters. This paper not only demonstrates the effectiveness of combining numerical simulation with engineering experience methods in determining safe mining dimensions but also provides strong support for the safe mining of Xincheng Gold Mine.