基于矿岩崩落规律的JM矿拉底方案设计

Design of JM Mine Undercut Scheme Based on the Law of Ore Rock Caving

自然崩落法中拉底方向和拉底高度的设计直接影响矿山生产和安全。以塞尔维亚JM矿为工程背景,结合拉底高度和拉底推进方向与主应力的关系设计了6种拉底方案,从矿岩崩落量、初始崩落拉底面积、持续崩落拉底面积、矿岩崩落速度4个方面分析不同拉底方案下矿岩的崩落参数,确定了最优拉底方案。结果表明:当采用拉底高度为10m、推进方向垂直于最大主应力方向的方案进行拉底工程布置时,崩落效果较好,矿岩达到持续崩落后,崩落速度较为稳定,该方案下矿岩初始崩落拉底面积介于4537.5~5400m^(2)之间,持续崩落拉底面积介于16537.5~18150m^(2)之间,持续崩落速度为0.2599m/d,可满足矿山生产要求。

The design of undercut direction and undercut height in bolck caving method directly affects mine production and safety.Taking JM mine in Serbia as the engineering background,six kinds of undercut schemes were designed based on the relationship among undercut height,undercut direction and principal stress.The caving parameters of ore and rock under different undercut schemes were analyzed from four aspects of ore and rock caving amount,initial caving undercut area,continuous caving undercut area and ore and rock caving speed,and then the optimal undercut scheme was determined.The results show that the caving effect of the scheme with the undercut height of 10mand the advancing direction perpendicular to the direction of the maximum principal stress is better.After the ore rock reaches continuous caving,the caving speed is relatively stable.Under this scheme,the initial caving undercut area of the ore rock is between 4537.5-5400m^(2),the continuous caving undercut area is between 16537.5-18150m^(2),and the continuous caving speed is 0.2599m/d,which can meet the requirements of mine production.