双鸭山铁矿诱导冒落法试验研究

针对双鸭山铁矿北区急倾斜破碎中厚矿体实际生产中存在的采准、切割工程难以形成,采场安全条件极差,损失、贫化大等问题,提出了切割巷+斜排炮孔拉槽、两端退采的诱导冒落法开采方案.给出了适合该类矿体的诱导工程参数,分析研究了其冒落进程、冒落块度,并预算了崩矿损失率、贫化率,依此在双鸭山铁矿S5采场进行试验.跟班标定表明,回采初期,回收率较高,冒落块度良好,与分析情况基本吻合;诱导区顶板冒透后,混岩率呈交替上升趋势变化,其现象与爆破块度及凿岩巷道位置有关.该法回收指标较好,可有效解决急倾斜破碎中厚矿体开采难题.

Experimental Study of the Induced Caving Method in the Shuangyashan Iron Mine

The cutting roadway， the broached groove of oblique blasthole and both ends retreat mining of the induced caving method was proposed due to difficult stope preparation and cutting engineering， poor stope safety conditions and high loss and dilution of the steeply inclined and fractured medium thick orebody in Shuangyashan iron mine. The suitable parameters to induce orebody caving were given. The caving process and the lumpiness of caving block were analyzed and the loss rate and dilution rate of caving ore were estimated based on the No.S5 stope in Shuangyashan iron mine. According to results of the regular shift recordings， the recovery rate was higher and the degree of the caving block was good in early recovery period， which was consistent with previous analyses. The rock mixing rate increased along with cycle changes after complete caving， and the phenomenon was associated with the position of the drilling of roadway and the lumpiness of blasting blocks. The recovery indexes of this method are good and the mining problems of the steeply inclined and fractured medium thick orebody can be effectively solved.