下向水平分层矩形进路膏体充填矿柱稳定性数值模拟研究

The Numerical Modeling Study on Stability of Paste Filling Pillar at Downward Horizontal Layered Rectangular Route

结合矿山生产实际情况,采用数值模拟方法分析分析了矩形进路不同结构尺寸(3m×3m、3m×4m和4m×4m)条件下,矿柱的动态形成过程与极限厚度。数值模拟结果显示,采用矩形进路进行多中段回采,当上下中段之间矿体厚度为24m时,应力集中现象明显,当前状态下矿柱逐步失稳,继续回采下一分层,矿柱整体失稳,失去其承载能力。可见改变矩形进路结构参数无法抑制或减缓矿柱的破坏。

The numerical modeling method is adopted to analyze the dynamic forming process and the limit thickness of ore pillar with the different structure size(3 m×3 m,3 m×4 m and 4 m×4 m)combining with the actual production situation of mine.The numerical modeling results show,the rectangular route is adopted for middle section extraction,when the orebody thickness between the upper part and middle part is 24 m,the stress concentration phenomenon is obvious,at the current state,ore pillar formal formed,continue extraction of the next layer,the overall instability of ore pillar shall be caused,the bearing capacity is lost.Therefore,changing of the rectangular route structure parameter cannot restrain or slow down the destruction of ore pillars.