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在大冶铁矿铁门坎南采区用分段空场法开采缓倾斜挂帮矿时 ,采用切割天井与出矿进路进行联合拉槽 ,即以切割天井为自由面 ,在出矿进路中 ,打与切割天井平行的扇形炮孔 ,按矿岩实际边界 ,逐排爆破崩落矿石 ,形成切割槽。根据矿山的实际开采条件 ,选择切割槽的合适位置 ,合理布置炮眼 ,应用一炮成井技术 ,与“V”型切割拉槽相比 ,其切割工程量减少 60 % ,切割成本降低 5 0 %
In the Daye Iron Mines Kanan mining area by the sub-field method to mine pitching hanging mine, the use of cutting the patio and the ore out of the joint pull groove, that is to cut the patio as a free surface in the ore into the road In the hit parallel with the cutting patio fan-shaped hole, according to the actual boundaries of the ore, blasting ore by row to form a cutting groove. According to the actual mining conditions of the mine, select the appropriate position of the cutting groove, reasonable arrangement of the hole, the application of a gun into the well technology, compared with the “V” cutting groove, the cutting work to reduce the amount of 60%, cutting costs reduced by 50%