Numerical Optimization of Broken and Difficult for Stope Mining in Underground Metal Mines

In a metal mine, there is a great risk of mining hidden resources caused by unreasonable mining in the early stage. In order to effectively and safely mine this part of the resources, it is based on investigating the current status of mining and delineating the area of instability and collapse, the area is firstly grouted and strengthened and temporarily supported, and then the first mining site and its mining method in the hidden danger area are given. The 3D model of the original goaf was constructed, and the numerical analysis model was introduced and numerical simulation was carried out, the results show that: 1) grouting reinforcement treatment and temporary support measures can effectively control the surrounding rock to continue collapse; 2) the original three-dimensional visualization model of the original goaf can reflect the real situation of the first mining stope; 3) based on the results of comprehensive numerical analysis, the stope structure parameters of the first stope are obtained, the length, width and height are 31x7.5x28.8m and 36x7.5x28.8m, respectively. The optimized result realizes the safe mining of the stope and provides reference and reference for the mining of similar stope.