上向进路充填法在“三下”矿体开采中的应用

Application of upward drift mining with backfilling in Under-Three-Objects ore body mining

某铁锌矿矿体位于河流和公路之下,属于典型的"三下"矿体,且矿区工程地质条件较差,开采难度大。为减小地表沉降,保护地表河流、公路与构建筑物,采用上向进路充填采矿法代替无底柱分段崩落法,并详细介绍采场结构尺寸要素、采准切割和凿岩、爆破、通风、出矿及充填等具体回采工艺。实践表明,上向进路充填采矿法顶板暴露面积小,作业安全,贫化率和损失率低,能较好地控制地表沉降和位移。

One Pb-Zn mine under a river and a road is a typical Under-Three-Objects ore body. Geological engi- neering condition of the mine is complicated and it is difficult to mine. In order to reduce the subsidence and protect the river, road and buildings on the surface, upward drift mining with backfilling method is used instead of non-pil lar sublevel caving method. The stope constructional parameters, mining cutting engineering, rock drilling, blasting technology, ventilation, ore removing and back-filling are introduced. The practice shows that upward drift mining with backfilling has small exposed area and low dilution loss rate, which can control the surface subsidence effectively.