Mathews图解法和Q系统分类法在苍山铁矿采场参数优化的应用

Application of Mathews Graphic Method and Q System Classification Method in Optimization of Stope Parameters of Cangshan Iron Mine

苍山铁矿矿区内褶皱及断层较发育,部分区域矿岩较破碎,给矿山生产带来安全问题。根据苍山铁矿主要矿体地质特征,利用Mathews图解法对采场顶板和上盘稳定性进行分析,基于Q系统分级进行无支护跨度计算。在确保采场顶板稳定的前提下,计算出采场的最大无支护跨度不宜超过13 m。当采场宽度为13 m时,采场最大长度不超过80 m,可以保证采场顶板和上盘的稳定性;当采场长度小于12 m时,采场最大长度不超过100 m,可以保证采场顶板和上盘的稳定性。根据计算结果,苍山铁矿采用了采场跨度为12 m,长度不超过100 m,最大顶板暴露面积不超过1 200 m^(2)的采场布置方式。实际验证表明,采场顶板及上盘稳定性保持较好,未发生顶板冒落现象,采场生产能力和矿石回采率得到提高。

Folds and faults are developed in the Cangshan Iron Mine area,and the ore rock is broken in some areas,which brings safety problems to mine production.According to the geological characteristics of the main ore bodies in Cangshan Iron Mine,the stability of the stope roof and hanging wall is analyzed by Mathews graphic method,and the unsupported span is calculated based on the Q system classification.On the premise of ensuring the stability of the stope roof,it is calculated that the maximum unsupported span of the stope should not exceed 13 m.When the stope width is 13 m,the maximum length of the stope does not exceed 80 m,which can ensure the stability of the stope roof and hanging wall.When the stope length is less than 12 m,the maximum stope length does not exceed 100 m to ensure the stability of the stope roof and hanging wall.According to the calculation results,Cangshan Iron Mine adopted a stope lay⁃out with a stope span of 12 m,a length of no more than 100 m,and a maximum exposed roof area of no more than 1,200 m^(2).Practical verification shows that the stability of the stope roof and the hanging wall is relatively good,the roof does not fall,and the stope's production capacity and ore recovery rate have been improved.