Research On Mining Scheme And Ground Pressure Control Of Deep Ore Body Based On Surface Dry-tailing Stacking Of Yuhuasi Mine

In accordance with development plan, Jinshandian Iron Mine would dischargedry-tailing stacking at Yuhuasi mining area. Intensified mining of-340m level wasnecessary to guarantee the implementation of dry-tailing stacking and mine productionsafety. After mining above-340m level, remaining deep ore body would reselect miningscheme to ensure production safety under the condition of surface dry-tailing stacking.Aiming at complicated engineering conditions, a three-dimensional model ofdry-tailing stacking engineering was established. Numerical simulation calculationmethod FLAC3D was used to analyze the influence of surface dry-tailing stackingstep-by-step and region-by-region on underground pressure distribution, stope ore androck movement, ore body mining below-340m level. Through numerical simulation ofdeep ore body mining process of caving method and filling method, filling method effectwas obvious to control surface subsidence and protect dry-tailing stacking engineering.In order to select optimum mining scheme, evaluation index system was structured fromprotruding mine characteristics. Upward drift filling method was optimal throughweighted grey relational analysis. Yuhuasi mining area would strengthen ground pressurecontrol to ensure mine production safety.The study would solve tailings disposal problem for5.8years of Jinshandian IronMine, propose safety and high efficient mining scheme below-340m level of Yuhuasimining area and ensure continuity and safety of underground mining production andgood economic benefit.