杏山铁矿斜分条分段崩落法试验研究

杏山铁矿小杏山采区为层状倾斜厚矿体，原用垂直走向布置进路的无底柱分段崩落法开采，存在矿石损失贫化大、上盘侧回采进路地压显现严重、巷道支护工程量大等生产问题.研究提出斜分条分段崩落采矿法，即沿矿体延深方向，从上盘到下盘按斜线分条开采，每一分条在矿体里布置诱导冒落进路，在崩落本分段矿石的同时，诱导近上盘矿体自然冒落，冒落的矿石由设置在下盘围岩里的回收进路回采.该法较好地顺应了倾斜矿体崩落矿石的移动规律，降低了采切工程总成本.试验采场自2019年5月开始回采，现已回采两个分段，矿石回采率由74%提高到85.6%，贫化率由18%降低到15%，取得了良好的技术经济指标.

Experimental Study of the Inclined Slices Sublevel Caving Method in Xingshan Iron Mine

The orebody in Xiaoxingshan mining area of Xingshan iron mine is layered inclined thick.Originally， the sublevel caving method without sill pillar was used for mining with drift perpendicular to strike， resulting in high ore loss and dilution， serious underground pressure behavior at hanging wall side of drift， large amount of roadway support engineering， and so on.Therefore， the inclined slices sublevel caving method is proposed. Along the deepening direction， orebody is mined according to the inclined line from the hanging wall to the footwall.An induced caving drift was arranged in each orebody slices.Current sublevel ore is caved， meanwhile the orebody near the hanging wall is also induced to cave naturally， and the caved ore is mined by the recovery drift set in the footwall surrounding rock. This method conforms to the movement law of ore caving in the inclined orebody， reduces the total cost of development and cut engineering.The experimental stope has been mined since May 2019， and now two sublevels has been mined， the ore recovery rate increased from 74% to85.6%， and the dilution rate has been reduced from 18% to 15%. New method has achieved good technical and economic indexes.