关键词: 缓倾斜极薄矿体, 采场结构参数优化, 数值模拟, FLAC3D方法

Abstract: In order to further optimize the stability of the stope structure of the gently inclined extremely thin ore body in Shandong Gold Mining (Xinhui) Gold Mine,the stope structure of the double side throwing and subsequent filling mining method was optimized.By using the finite element analysis software FLAC3D and combining the actual situation of the ore body,five stope width structures at 1.0,1.5,2.0,2.5,3.0 m were designed.Calculating and analyzing the maximum principal stress and maximum displacement after excavation under different conditions so as to obtain the optimal stope structure parameters.The study results shows that with the increase of the mining width,the stress and damage range generated after the first step of mining increase significantly,and the subsidence displacement of the roof gradually increases.In the plan with the mining amplitude of 2.5 m and 3.0 m,after the stress redistribution of the fourth and fifth step of mining,the stress of surrounding rock presents an upward trend,with potential rock burst risk.In different mining processes,the stress in the surrounding rock is released,which makes the stress distribution reach a new equilibrium state.At the same time,through data comparison and analysis,the stope structure parameter of 1.5 m is the best scheme for the gently inclined extremely thin orebody by adopting the double side throwing and subsequent filling mining method,which can ensure the safe and efficient production in the mine.

Key words: slightly inclined extremely thin orebody,optimization of stope structure,numerical simulation,FLAC3D method