沿脉进路无底柱分段崩落法采准的优化(英文)

Optimization of Development Work for Non-pillar Sublevel Caving with Following-vein Drift

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。

Deficient floor slope angle of an ore body often needs to dig a drift （or access） in its footwall rock when adopting non-pillar sublevel caving following-vein excavation. Considering the problem that the conventional qualitative determination of the bourn of rock digging results in a poor index of ore recovery, two quantitative methods are brought out to determine the bourn of rock digging. It adopts the maximum profits of mined ore and unit reserve ore as indicators. The analysis results show that the maximum profit of unit reserve ore is more rational. With real examples, the optimal distance between following-vein drift and ore body with respect to the ore deposit diversity is analyzed. According to the ore body condition and economical index, the distance between following vein drift and ore body at Zhangjiawa Iron Mine - 250m level is optimized, and the optimal distances for various ore deposit situations and the corresponding count- ing formula are obtained. Based on regression, a general counting formula is also developed. The optimazation method and outcome can serve as a basis for the development design of Zhangjiawa Iron Mine non-pillar sublevel caving with following-vein, access and provide a reference to other mines in determining footwall rock digging bourn and drift position.