空场法演变为崩落法过程中爆破参数及出矿方式研究

李家沟矿区采矿方法由空场法向崩落法演变。演变过程中对崩矿步距、最小抵抗线、孔底距、边孔角等爆破参数进行了验算和调整；对电耙和铲运机2种出矿方式进行了对比分析，通过现场试验，确定采用铲运机出矿方式；对相邻巷道应力分布进行了分析计算，确定了进路间距。实践表明，爆破参数的调整及出矿方式的选择对降低采矿贫损率起决定性的作用。李家沟矿区空场法演变为崩落法过程中爆破参数及出矿方式的研究为同类矿山降低贫损率提供了借鉴。

Study of the Blasting Parameters and Ore Removal Way in the Evolution Process from Open Stoping Method to Caving Method

The mining method of Lijiagou mining area is evolved from open stoping to caving.The blasting parameters such as ore caving interval,least resistance line,bottom hole pitch,side hole angle are checked and changed in the evolution process of the mining methods;the two ore removal ways of transfer and craper are LHD are conducted comparison and analysis,through field test,the LHD method is selected as the ore removal way in the mining area;besides that,stress distribution of the adjacent roadways are calculated,and the advance interval is also determined.The practice results show that the adjustment of blasting parameters and the selection of ore removal way have a crucial role to reduce the dilution rate and loss rate during the mining process.The above study results related to study of the blasting parameters and ore removal way of Lijiagou mining area during the evolution process of the open stoping method to caving method can provide some reference for reducing the dilution rate and loss rate in the similar mines.