Optimizing roadway arrangement way unceasingly, reducing the tunnel drivage ratio is an important task in the mine mining design process.
不断优化巷道布置方式，降低巷道掘进率，是矿井开采设计过程中的一项非常重要任务。
Combining with a tunnel construction case, an ordinary method of ascertaining Optimum hole depths in small exploration tunnel drivage is discussed.
结合一坑道施工实例，论述了小型探矿坑道确定最优炮眼深度的一般方法。
Combining with a tunnel construction case, an ordinary method of ascertaining Optimum hole depths in small exploration tunnel drivage is discussed.
结合一坑道施工实例，论述了小型探矿坑道确定最优炮眼深度的一般方法。
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