Bees Mountain Lead-zinc Mine Stope Structure Parameters Optimization Research

The Northern Mining District of Bees Hill ore block is gently inclined、tilt in the thick、 thick ore body. Ore body roof and bottom was a pulpy than the weak and easy to collapse.The ore body are joints、fissures and unstable and medium solid. In such ore body is a difficult ore body recognized at home and abroad, the occurrence of ore bodies, so that such the ore bodies in the mining process, a series of technical problems, such as the mining method is difficult to choose,the cut mining project is a large amount, fall ore and ore haulage is difficult, low degree of mechanization and operating efficiency, long production cycle, the loss of such depleted. During mining ore,the qusetion of high Ore dilution、low recovery rate and poor roof stability. This paper studies the bees Hill Pb-Zn north mining area P42～P46line ore bodies.In order to improve economic efficiency and security production safety.In this paper, doing field investigation and analysis and then proposing sublevel law the caving joint mining method.Combined with the mining technical conditions and then proposing the three kinds of mining method, through the technical and economic conditions,preferred to stay nursing top seam of the bottom structure of the explosive powerr haulage sublevel-caving method.With numerical simulation method, the explosive force of the stay nursing top seam of the bottom structure of haulage4Sublevel-caving method of stope structure parameters were optimized,This paper on the basis of a detailed study of rock physical and mechanical parameters, on the basis combination tests of early mining methods, we further optimize the simulation of structural parameters of the six kinds of stope FLAC3D numerical analysis software tools, simulation is calculated for each program in the size of the recovery of each step of the stress distribution, the amount of displacement and plastic zone distribution. Obtained depending on the size of the simulated stope stope stress distribution and failure mode, the recovery of stress concentration, the position and shape of the maximum compressive stress, maximum tensile stress and the plastic zone, comparative analysis to determine the optimal size of the stope.Numerical Simulation and Analysis for the obtained optimal stope structure parameters: retaining top-level thickness of5m; slant column thickness of3m. In this stope structure parameters stope security, and the large size of the stope structure to improve the recovery rate, reduce the dilution rate, improve production efficiency.