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针对急倾斜极不稳固薄到中厚矿体开采安全性差、回采效率低、成本高、回采率低和回采方案少等问题,特别是该类矿床品位低的资源没有经济可行采矿方案的难题。研发了脉外分段空场采矿法,并就无切割井拉槽、强制和诱导联合崩落落矿、极不稳固岩体内中深孔护孔和贫化控制等关键技术提出了解决方案,能实现该类矿体的安全、低耗和高效开采,当矿体围岩稳固性好和矿岩界线清晰时,开采效果尤佳。
In view of the problems of poor mining safety, poor recovery efficiency, high cost, low recovery rate and few recovery schemes for extremely steeply unstable ultra-thin to moderately thick ore bodies, especially the low-grade resources of such deposits do not have the problems of economically feasible mining schemes. Developed extra-pulse sectional mining method and proposed solutions to the key technologies such as trough without cutting well, coercion and induction of avalanches, middle-deep hole protection and depletion control in very unstable rock mass, This kind of ore body can realize the safe, low-consumption and high-efficiency mining. When the stability of the surrounding rock of the orebody is good and the boundary of ore rock is clear, the mining effect is particularly good.