盘区上向分层进路阶梯式回采充填采矿方法应用研究

南京栖霞山铅锌矿采用上向点柱分层充填采矿方法回采,由于随着开采深度的增加,采场顶板及上盘围岩应力集中,引起顶板冒落。为了提高回采作业安全性和回采率,盘区上向分层进路阶梯式回采充填采矿方法由多个采场组成一个盘区,以进路方式由下向上分层回采,每一分层间隔布置Ⅰ、Ⅱ期若干进路,以每条进路为单元分别进行回采和充填,Ⅰ期进路超前Ⅱ期进路形成阶梯式回采,进路充填不需进行采场接顶,一个采场可间隔布置多个作业面进行采矿和充填。为了有效控制Ⅱ期进路回采时Ⅰ期进路充填体垮塌现象,提出了预留梯形矿柱或连续条形矿柱的回采方案,保证了回采作业的安全。应用研究表明,采场的综合生产能力达到每月6 452t,回采率达到了87.1%,贫化率小于3%,生产能力完全达到了设计的要求。

Application Research on the Panel Overhand Drift With Stair-stepping Arrangement and Filing Mining Method

Nanjing Qixiashan lead-zinc mine adopts the overhand slice stopping and filing mining method. As the depth of mining increasing, the stress concentration of the roof and hanging wall in stope is obvious, which causes the roof caving. In order to improve the safety of mining operation and recovery rate of mineral resources, the panel overhand drift with stair-stepping arrangement and filing mining method is adopted. A panel consists of several stopes. The stopping sequence is from the bottom to the top with drifts which are divided into phases I and II in slices. The phases I drifts are ahead of the phases II drifts, which forms stair-stepping appearance. Each drift is used for stopping and filling which is no need to roof-contacted fill. A stope can be divided into several drifts to mining and filling. In order to effectively control the collapse of filling bodies in Phase I drifts during the Phase II drifts mining, a mining scheme with leaving trapezoidal pillar or continuous strip-shaped pillar is carried out, which ensures the safety of the mining operations. The application research shows that the comprehensive production capacity of the stope reaches 6452t/ month, the recovery rate reaches 87.1%, the dilution rate is less than 3%, and the production capacity fully meets the design requirements. The panel overhand drift with stair-stepping arrangement and filing mining methodl has the characteristics of large stope production capacity, high recovery rate, and low dilution rate. In addition, the mining method does not need to roof-contacted fill, which reduces the production process and improves the operation cycle efficiency.