无底柱分段崩落法过渡分段放矿方式优化研究

无底柱分段崩落法的发展趋势是增大采场结构参数，因此现行许多矿山都存在如何使采场结构参数从普通间距向大间距过渡的问题。以金山店铁矿为例，针对过渡分段出现的放矿问题，以无底柱低贫化放矿理论为指导思想，提出综合考虑多分段的优化放矿方式，得出与之相配套的崩矿步距；并在此基础上，提出实现最优放矿的措施，即爆破优化、放矿管理及截止出矿品位的控制。

Optimization of Ore Drawing Mode for Transition sublevel in Pillarless Sublevel Caving

The development trend of the pillarless sublevel caving method is to increase the structural parameters and therefore, many existing mines have to confront with the transition of the stope structural parameter from the common space to a larger space. With Jinshandian Iron Mine as the case, in view of the ore drawing problem in the transition sublevel and guided by the pillarless low dilution drawing theory, it is suggested to comprehensively consider the optimized ore drawing mode of multiple sublevels and to find a corresponding caving space. On this basis, the optimal drawing measures are put forward, including the blast optimization, the ore drawing management and the control of the cut-off drawing grade.