A Theoretical and Numerical Evaluation of Stope Structural Parameters in Open Stoping and Subsequent Backfill

Lin Chen, Qingling Liu, Wendong Li, Shaohui Tang

Abstract: Open stoping and subsequent backfill is a mining method with high requirements for rock mechanical conditions and ore recovery. To optimize stope structural parameters in Jama copper mine, Serbia, A theoretical calculation and numerical simulation is carried out. Under the condition of keeping constant stope length and height, the reasonable range of structural parameters is obtained through the theoretical calculation of safe span. Further, FLAC3D is used to simulate the stope stability under four schemes, and the displacement, plastic zone distribution, principal stress change and safety factor value are used as the criteria. The results show that when the stope structural parameters are 60 m in length, 18 m in room width, 15 m in pillar width and 40 m in height, there is no through failure in the whole mining process. When simulating the mining of the stope at -210 mL, safe and efficient mining is realized with the stable mined-out areas at upper stage. This study provides theoretical basis and technical reference for the sustainable development of BR ore body in Jama mine.

Keywords: Open stoping and subsequent backfill, Safe span, Numerical simulation, Structural parameter optimization