基于大比例尺立体模型的放矿参数优化研究

Optimization Research on Ore Drawing Parameters Based on Large Scale Stereomodel

结合某铁矿实际,采用1∶50比例尺建立多分段多进路无底柱分段崩落法立体模型,进行放矿实验研究。实验严格控制矿岩粒级组成,采用铰接式活动铲斗、栅式嫁接矿壁等相似模拟技术,进一步提高了模拟相似程度。以回贫差为指标,在分段高度20 m条件下进行了11组相似模拟实验。研究结果表明,矿壁倾角是影响矿石回收指标的主要因素,最优崩矿步距为3.6m,最优矿壁倾角为85°;与20m进路间距相比,18m进路间距更有利于提高矿石回收率。实验参数来源可靠,大比例尺立体放矿相似模拟实验相似度高,对极厚大矿体室内放矿实验研究有借鉴意义,研究结果对矿山工业实验具有较高的指导价值。

According to the practice in an iron mine,the 1∶50 scale stereomodel of sublevel caving method with multiple segments and routes was built,and ore drawing experiments were carried out.The size grading of ore rock was strictly controlled,and similar simulation technologies were adopted in experiments,such as hinging active bucket and bar-type grafting rib,so as to further improve the similar degree of stimulation.Taking the difference of recovery and dilution as a mining indicator,11 similar simulation samples were carried out under the sublevel height of 20 m.The results showed that ore wall angle was the main factor to influence the ore recovery index,the best ore caving step was 3.6m,and the best ore wall angel was 85°.The space of 18m was more beneficial than the drift space of 20m to improve ore recovery.The source of experimental parameters was reliable,and the simulation experiments of large scale drawing stereomodel had high similarity,which had reference to drawing laboratory experiments for extremely thick and large ore body.The results of study had higher guidance value to industrial experiments of mine.