In the mining process,determining the structural parameters of a stope is fundamental to optimizing production capacity and economic outcomes.Ensuring safe production necessitates that these parameters vary according to geological conditions,making their selection a focal point of interest within the mining sector.At the Fankou lead-zinc mine,the tailings reservoir is scheduled for gradual decommissioning,necessitating the deposition of excessive fine-grained tailings in the mined-out stopes.The structural parameters of the stope directly influence the capacity for tailings storage.To achieve larger structural parameters while maintaining the stability of the open stope,a study was conducted on the shn S17-18 stope.This involved obtaining surrounding rock stability parameters through on-site rock drilling,coring,and joint condition assessments.The stability coefficient of the stope’s exposed surface was calculated using the Mathews graphical method.The study concludes that the stability of the upper wall of the stope is the most robust,whereas the roof exhibits the weakest stability.In light of the impact of exposure time on the stability of open pits post-mining,the stability coefficient has been optimized.Based on the 80%,75%,and 70% equiprobability lines from the Mathews sta-bility graph,three stope structural parameter schemes have been identified:57.0 m×12.5 m×40.0 m,79.0 m×14.8 m×45.0 m,and 108.0 m×17.2 m×50.0 m.Utilizing FLAC3D software,numerical simulations were conducted for these structural parameters,and the post-mining stability of the stope was assessed in terms of displacement,maximum principal stress,and plastic zone.The findings indicate that the stope designed with a 70% stability probability line does not ensure stability.To ensure the safety of the open stope,it is recommended that the stope structural parameters be determined with a stability probability exceeding 75%.Field tests were conducted in the shn S17-18 stope,revealing a stability probability ranging from 75% to 80%.Post-mining,the stope remained stable,thereby effectively validating the reliability of both theoretical and numerical simulation results.These findings provide significant insights for selecting stope structure parameters in future tailings disposal within mining operations.
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