无底柱分段崩落采矿法采场结构参数研究

Study on structural parameters of sublevel caving of mining without sill pillars

以兰尖铁矿尖山矿区无底柱分段崩落采矿法为工程背景,为降低矿石损失贫化,采用室内试验优化采场结构参数。通过立体放矿模型,采用室内相似模拟试验研究端部边界条件下散体流动规律,并利用达孔量法测定放出体形态。根据试验结果,结合达孔量曲线,得出了矿石散体的流动参数为:α=1.833;β=0.188;α1=1.512;β1=0.224。结合放出体形态和测得的流动参数确定尖山矿区进路间距为17 m,崩矿步距为4 m。

The paper takes sublevel caving mining without sill pillars in Jianshan Mining Area in Lanjian Iron Mine as the engineering background. To reduce the ore loss and dilution, the stope structural parameters are optimized by laboratory experiments. By three-dimensional model of ore drawing, the laboratory experiments apply an indoor similar simulation to study the granular materials flow rulesat critical conditions, and the shape of the discharging body is determined by zeroization quantity measurement method. According to the experiment results and the zeroization quantity curve, the flow parameters of granular materials are obtained ： α= 1. 833 ;β = 0. 188 ; α1 = 1.512 ; β1 = 0. 224 ; the shape of discharging body and the measured flow parameters determine that the mining access spacing is 17 m and the caving interval is 4 m.