某铁矿无底柱分段崩落法低贫损开采方案研究

Study on Low Dilution Loss Mining Scheme of Pillarless Sublevel Caving in an Iron Mine

结合某铁矿开采技术条件,首先分析了常规无底柱分段崩落法存在的问题,在此基础上开展了采矿方案的优化研究和改进。依据厚度矿体,将回采进路垂直矿体走向布置方式调整为沿矿体走向布置,保障下盘矿体充分回收;对于中厚矿体,根据放矿模拟实验的结果,改进采场结构,并合理确定出矿巷道的位置和边孔角。建立ANSYS数值模型,对沿空掘巷实现巷道围岩让压的作用机理开展研究。合理安排凿岩巷道的掘进时间和顺序,实现让压开采,降低巷道围岩的应力。通过采取上述措施,降低开采的损失贫化指标,达到保产、提效、安全开采的目的。

Combined with the mining technical conditions of an iron mine,the problems arising from the application of the conventional pillarless sublevel caving method were firstly analyzed,and on this basis,the optimization research and improvement of the mining scheme were carried out.According to the thick⁃ness of the ore body,the strike arrangement of the vertical ore body in the stoping road is adjusted to the strike arrangement along the ore body to ensure that the footwall ore body is fully recovered.For the medium thick ore body,the stope structure is improved according to the results of the drawing simulation experi⁃ment,and the location and side hole angle of the ore drawing roadway are determined reasonably.The AN⁃SYS numerical model is established to study the mechanism of caving surrounding rock through goad excava⁃tion.Reasonable arrangement of tunneling time and sequence can achieve pressure mining and reduce the stress of roadway surrounding rock.By taking these measures,the loss and dilution index of mining can be re⁃duced,and the purpose of production protection,efficiency improvement and safe mining can be achieved.