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大红山铁矿多个采用崩落法回采的特大采区逐步实现了大范围的贯通,针对贯通采区侧上方待回采矿体的安全生产难题,采用理论分析对采区贯通前后围岩中的次生应力集中规律进行了研究,采用钻孔探测与应力计对围岩中的崩落范围与应力重分布进行了监测,加上地表开裂沉降范围的实时动态监测,评估得到了采区贯通对侧上方待采矿体的影响范围与程度,通过理论分析与实测数据,提出了上覆岩层承压拱消失的观点,发现了大红山铁矿崩落法采矿整体进入应力释放与平稳期这一重要现象,这一结论对采空区侧上方待采矿体的地压安全十分有利。
In the Dahongshan Iron Mine, a large number of extra-large mining areas with caving method have gradually realized a great deal of penetration. According to the problem of safety production that runs through the mining area above the mining area, Secondary stress concentration law was studied. The borehole caving and stress gauge were used to monitor the caving range and stress redistribution in surrounding rock. Combined with the real-time dynamic monitoring of the settlement of surface cracking, The scope and extent of the influence of the upper ore body to be treated, the viewpoint that the pressure-bearing arch of the overlying rock layer disappears is put forward based on the theoretical analysis and the measured data, and it is found that the whole process of Caving mining in Dahongshan Iron Ore enters the important phenomenon of stress release and plateau This conclusion is very beneficial to the ground pressure safety of the orebody above the gob area.