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我矿主矿体井下开采用的是无底柱分段崩落法。矿体上部比较缓(倾角30°～70°),下部比较陡(倾角70°～90°)。在第一中段回采过程中,发现矿体上盘部位在倾向方向上急剧变缓,个别区段倾角变为20°以下。很显然,矿体变化以后,在缓倾斜区段的上部就会出现充填垫层空缺或不足的现象,给崩落法的正常回采带来了新的困难。针对这一情况,我矿采取了“先用空场法回采缓倾斜区段的矿石,后用水平
Mine miners mine underground mining is the use of subsea sub-caving method. The upper part of the ore body is relatively slow (dip 30 ° ~ 70 °) and the lower part is steep (dip 70 ° ~ 90 °). In the first middle section of the mining process, it was found that the part of ore body plate in the tendency of a sharp slow down, individual section inclination becomes 20 ° or less. Obviously, after the change of the ore body, there will be a vacancy or deficiency in the upper part of the gently inclined section, which brings new difficulties for the normal recovery of caving method. In response to this situation, I mine took "the first use of empty field recovery of gently inclined section of the ore, after the level