下向进路充填采矿法深部矿岩破坏机理数值模拟研究

Study of deep-mine ore rock failure mechanism using downward approach filling mining method by numerical simulation

针对嵩县山金深部矿体采用下向进路充填采矿法开采矿岩破坏机理及地压显现技术问题,采用Rhino+Griddle+Flac 3D快速建模技术,对矿区下向进路开采1~8 a矿岩应力及位移变化规律进行研究。模拟结果表明:最小主应力随深度的增加而增加,靠近底部较大;未开采采场起到了临时矿柱的作用,应力集中现象较明显,同时在采场附近的充填体中也形成应力卸压区;各中段的位移随开采时间的增加而不断增大,采场顶板的最大位移主要出现在顶板中间,在矿山不断向深部推进的过程中,最大位移值呈上升趋势。

To study the deep-mine rock failure mechanism and the technical issue of ground pressure manifestation using the downward approach filling mining method in the deep ore bodies in the mining area of Songxian Shanjin,the research employs rapid modeling techniques using Rhino+Griddle+Flac 3D to investigate the stress and displacement patterns of ore rock during 1-8 a of downward approach mining.The simulation results indicate that the minimum principal stress increases with depth,being greater near the bottom.The unmined stope acts as a temporary ore pillar,exhibiting significant stress concentration,and a stress relief zone forms in the filling body near the stope.The displacement in each level increases with mining time,with the maximum displacement at the stope roof appearing mainly in the middle of the roof.As the mine progresses deeper,the maximum displacement value shows an upward trend.