• During mechanical longwall top coal mining, the gas permeability in top coal ahead of working face has bigger difference compared with slice mining due to the increase of mining height.

    综放开采由于采高加大,导致采场前方顶煤瓦斯渗透性分层开采较大差异

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  • The underhand slice stoping with cemented filling is the most effective mining method for incompetant orebody with complicated mining conditions.

    分层胶结充填采矿法矿岩破碎、开采技术条件复杂的难采矿有效的采矿方法

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  • The underhand slice stoping method, with reinforced concrete for roof support, is recommended to mine narrow veins where the mining technological conditions are very complicated.

    针对采矿技术条件复杂的矿脉开采推荐采用有钢筋混凝土的下分层充填采矿

    youdao

  • The underhand slice stoping method, with reinforced concrete for roof support, is recommended to mine narrow veins where the mining technological conditions are very complicated.

    针对采矿技术条件复杂的矿脉开采推荐采用有钢筋混凝土的下分层充填采矿

    youdao

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