中文摘要：

陕北榆阳区地方中小煤矿老式房柱式开采煤柱稳定性存在较大安全隐患,可能影响煤柱后期的置换开采,基于此,通过对煤柱长时效应进行分析,指出现阶段＂采12留8＂窄条带开采煤柱的长期稳定性优于房柱式开采的矩形煤柱,并给出了条带煤柱置换开采的工作面通风方法和充填方式,提出了前进式充填后退式煤柱置换的开采方式,为陕北中小煤矿保水开采煤柱的稳定性及提高回采率提供了一种新思路。

英文摘要：

The old room and pillar mining methods, commonly used in medium and small coal mines in Yuyang district of northern Shaanxi province, has potential safety hazard, which may affect the replacement mining of coal pillars. Based on the long time effect analysis of coal pillars, the paper pointed that the long - term stability of narrow coal pillar in ＂mining 12 remaining 8＂ was better than that of rectangular coal pillar in room and pillar mining. A working face ventilation method of replacement mining and a filling method were introduced, and a mining way was proposed with advancing filling and backing coal pillar replacement. The study provided a new idea for ensuring the coal pillar stability and recovery rate of water- preserved mining in medium and small coal mines in northern Shaanxi province.