基于FLAC^(3D)的二步采场结构参数优化及工程应用

Structural Parameters Optimization and Engineering Application of the Second-step Stope Based on FLAC^(3D)

为了保证三山岛金矿二步采场的生产能力和开采安全性,采用三维有限元方法对不同结构参数的二步采场开采稳定性进行分析,优选安全合理的采场参数。通过计算和分析不同结构参数的二步采场在开采过程中顶板和上盘围岩的应力、位移变化特征,得出不同参数的采场稳定情况。结果表明:当采场高度为12 m时,顶板和上盘围岩的拉应力和位移都较大,采场的稳定性较差;当采场宽度大于10 m时,顶板和上盘围岩的拉应力和位移的变化率呈增长趋势,采场稳定性逐渐变差。因此,建议二步采场宽度为10 m,高度10 m。将优化结果应用于工程实践,表明该参数安全合理,保证了矿山安全高效开采。

In order to ensure production capacity and mining safety of the second-step stope,3D-FEM was conducted to analyze the stability of the second-step stope with different structure parameters to select the safe and reasonable stope parameters. Stress and displacement of roof and hanging-side rock with different structure parameters were calculated and analyzed to judge the stability of the stope. Result showed that,the stress and displacement of roof and hanging-side rock was large when the height of the stope was 12 meter,and the stability of the stope was poor; the change rate of the stress and displacement of roof and hanging-side rock was a growing trend,and the stability of the stope was worse with width increase. So the safe and reasonable width and height of the second-step stope was 10 meter. The results of the analysis applied to practical engineering showed that the parameters are safe and reasonable,and safe and efficient mining of the mine was guaranteed.