Abstract:

 The Ordovician limestone water is a main threat in mining No.5 coal bed in Fenyuan coal field. This paper applies water inrush coefficient approach to study the water inrush risk of coal floor from water pressure, floor destruction, water resisting capability, confined water level height, and aquiclude thickness in limestone top. Combined with drilling logs, this paper measures water inrush coefficient and draws a contour map, marks safe zones, relative safe zones, relative dangerous zones and dangerous zones, which can provide a reference for mining planning and water disaster prevention.
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Key words: coal seam, floor, water inrush factor, water inrush coefficient, mining division under pressure

摘要：

奥灰水是汾源井田5号煤层开采的主要水害威胁。采用突水系数法对汾源井田5号煤层底板奥灰突水危险性进行研究。分析了5号煤层底板奥灰水压、开采对底板的扰动破坏，隔水层阻水能力、承压水导升高度、奥灰顶部相对隔水层厚度等因素。结合井田钻孔资料，计算了突水系数，绘制了奥灰突水系数等值线图，划分了井田带压开采安全区、相对安全区、相对危险区和危险区。井田带压开采危安区的划分可为汾源矿井带压开采区采掘方案和矿井防治水工作方案的制定提供参考依据。

关键词: 煤层, 底板, 突水因素, 突水系数, 带压开采分区