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充填体下隔离中段大直径深孔采矿的难点,主要是充填体强度较低及充填质量分布不均匀,无法保证应力集中状态下采场顶板和上部充填体的稳定性,实现矿山资源的安全回收.采用FLAC~(3D)有限差分程序,模拟计算了阿舍勒铜矿充填体条件下450 m中段4种采场跨度下的3种回采方式,从位移、最大主应力和最小主应力3个方面对采场顶板和上部充填体的稳定性进行了对比分析研究.结果表明,采场跨度12 m时,充填体顶板稳定性良好;当采场跨度14 m时,充填体顶板沉降及矿柱主应力明显增大,处于极限平衡状态;当采场跨度15 m时,采场顶板的主应力急剧降低,最大垂直位移急剧增加,采场已失稳.因此,为保证450 m隔离中段矿柱的顺利回采,一、二步骤的采场跨度不宜超过12 m.
The difficulties of mining large-diameter deep-hole in the middle section under the filling body are mainly that the strength of the filling body is low and the filling quality is unevenly distributed, and the stability of the top plate and the upper filling body under the stress concentration state can not be guaranteed so as to realize the safe recovery of mine resources Using the FLAC 3D finite difference program, three kinds of recovery methods under four kinds of stope spans in the 450 m middle section under the condition of Ashele copper mine filling body were simulated and calculated. Three kinds of recovery methods including displacement, maximum principal stress and minimum principal stress The stability of the backfill and the upper backfill are analyzed and compared.The results show that the stability of the backfill is good when the stope length is 12m and when the stope length is 14m, The main stress increases obviously and is in the state of limit equilibrium. When the stope length is 15 m, the principal stress of stope roof suddenly decreases, the maximum vertical displacement increases sharply and the stope has instability.Therefore, in order to ensure the 450 m isolated middle pillar The smooth mining, one or two steps of stope should not span more than 12 m.