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一、概况 阳泉四矿主采煤层是15~#煤层,即丈八煤,用斜井盘区开拓,走向长壁,分层金属网假顶下行垮落法采煤,中央并列与两翼对角混合抽出式通风。三台主扇联合运转,总排风量19500米~3/分。矿井年产量为250万吨,相对瓦斯涌出量13.17米~3/吨,属高沼气矿井。煤尘爆炸指数8.17％,有爆炸性,煤层发火期为6～24个月。 丈八煤20采区北8206工作面,是分三层开采的炮采面。工作面长130～170米。走向长270米,煤层厚度6米,倾角3°～8°,采用
I. Overview The main coal seam of Yangquan No.4 coal mine is 15 ~ # coal seam, ie, Zhangba coal. It is exploited by slant shaft extensional area and goes down longwall with stratified metal net roof falling down caving method. Central parallel and two wings Angle mixed extraction ventilation. Three main fan combined operation, the total exhaust volume 19500 m ~ 3 / min. Mine annual output of 2.5 million tons, the relative gas emission 13.17 m ~ 3 / ton, a high biogas mine. Coal dust explosion index 8.17%, explosive, coal seam firing period of 6 to 24 months. Eight coal mining area 20 8206 North face, is divided into three layers of mining artillery mining surface. Working face length 130 ~ 170 meters. Go 270 meters long, 6 meters thick seam, dip 3 ° ~ 8 °, using