Sublevel caving without sill pillar is used in Xishimen Iron Mine.

西石门铁矿采用无底柱分段崩落采矿法开采.

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The calculation on working resistances of supports has been one of key research questions sublevel caving.

支架工作阻力计算是综放开采研究的主要问题之一.

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Analyses factors that affect cover caving ability of roof coal in sublevel caving mining method.

分析了放顶煤开采顶煤冒放性的影响因素.

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