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benching bank
expl.
工作台
;
台阶
按剥离、采矿或排土作业的要求,以一定高度划分的阶梯,位于外形垂直或近似垂直的岩石上或岩石顶部的水平表面,可以在这样的表面上钻垂直或倾斜孔并装药。台阶的高度常常在几米到30m之间变化、在露天开采中,12belt15m的台阶是比较普遍的。台阶通常用于露天开采,有时也应用于大型的地下矿井
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