The optimization of mining methods by FLAC^3D in stooping safely and pillar extraction of Jinchangyu Gold Mine

With the continuous increase of the number of underground mine cavity in Jinchangyu Gold Mine in recent years,the cavity condition become more and more complicated.It may cause the surface subsidence at any time.So it is very urgent to carry out cemented waste rock backfills technology for cavity treatment and the stoping of remnant ores research.According to the similar mine experience,it proposed 4 remnant ores recovery schemes,and use FLAC3D to do the numerical simulation and analysis for the 4 schemes.The results showed that the first scheme of vertical stress,displacement and settlement and distribution of plastic zone and the maximum principal stress index is better than the other schemes.It tan guarantee the the overall safety and stability of production process.Therefore the first scheme is recommend for large-scale application in Jinchangyu Gold mine.