论文部分内容阅读
采用沿脉布置的无底柱分段崩落法,当矿体底板倾角不足时,需要在下盘岩石中开掘进路。针对传统定性确定开岩边界导致矿石回收指标差的问题,提出了两种定量确定方法,即按采出矿石赢利最大和按单位储量矿石赢利最大作为确定开岩边界的判据。分析表明,以单位储量矿石赢利最大为判据更合理。通过实例计算,分析了沿脉进路与矿体的最佳距离随着矿体赋存状态的变化规律。根据矿体条件和经济指标,对张家洼铁矿-250m中段分段崩落法沿脉进路与矿体距离进行了优化,得到了各种矿体赋存条件下的最佳距离和相应的计算公式,回归了统一的计算公式。优化方法和结果,可作为张家洼铁矿沿脉进路无底柱分段崩落法采准设计的依据,对其他矿山确定下盘开岩边界和计算进路位置具有借鉴作用。
Bottomless pillar caving method along the veins is adopted. When the inclination of the ore body floor is not enough, it is necessary to excavate the road in the lower plate rock. In order to solve the problem of poor ore recovery index, the authors proposed two quantitative determination methods, that is, the criterion of determining the boundary of open rock according to the maximum profit of mining ore and the maximum profits of ore per unit reserves. The analysis shows that it is more reasonable to take the maximum profit per ore unit as the criterion. Through the example calculation, the variation regularity of the optimal distance along the vein path and the orebody with the occurrence state of the ore body is analyzed. According to the ore body conditions and economic indicators, the optimal distance between the ore-entry along the vein and the ore body is optimized for the sub-caving method at -250m in Zhangjiawa Iron Mine, and the optimal distance Calculation formula, return to a unified calculation formula. The optimization method and result can be used as the basis for the quasi-design of subsidence-free caving method of Zhangjiawa iron ore deposit along the pulse line. It can be used as a reference for other mines to determine the boundary of perforator rock and calculate the approach route.