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近年来，我国综采放顶煤采煤法得到长足的发展，取得了较好的技术经济效益。文章介绍了石嘴山矿务局二矿，采用２柱掩护式放顶煤液压支架使用经验和效果。
In recent years, China’s fully mechanized top coal caving mining method has made considerable development, and achieved good technical and economic benefits. This paper introduces the No.2 Mine of Shizuishan Mining Bureau and adopts the experience and effect of using 2-column shield caving hydraulic support.