阶段空场嗣后充填采场结构参数优化研究

Optimization Study on Stope Structure Parameters of Sublevel Open Stoping Method with Backfill

合理的采场结构参数对于保障矿山安全高效开采至关重要。以金山店铁矿为工程背景,采用简支梁理论、荷载传递线理论和厚跨比理论计算采场临界跨度,并运用FLAC3D软件对8,10,12,15m4种采场跨度方案进行数值模拟研究,从位移变化规律、围岩应力分布以及塑性区分布情况进行计算分析,确定了有利于采场结构稳定的参数。研究结果表明:当采场跨度为10 m时,既能保证采场稳定,又可高效生产,研究结果能够为国内外空场嗣后充填法推广应用提供理论参考依据。

Reasonable stope structure parameters are essential to ensure safe and efficient mining of mines.Taking Jinshandian iron mine as an engineering background,critical stope span was calculated by the simply supported beam theory,load transfer intersection line theory and thickness-span ratio method.Four kinds of stope span schemes(8,10,12,15 m)were simulated and analyzed by FLAC3 D.The displacement rules and stress distribution of surrounding rock were calculated and analyzed,as well as the distribution of plastic zones.Then the parameters conducive to the structural stability of stope were determined.The results showed that when the stope span was 10 m,the stope stability and efficient production could be guaranteed.The study results could provide a theoretical reference for the popularization and application of the open stoping method with backfill in the world.