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一、概况 611工作面位于李封矿天官区东部-90～-100水平,煤层倾角6°～8°,煤厚6米,工作面走向长度370米,倾斜长度70～110米(以上均不包括同时回采的煤柱尺寸)。该采区瓦斯含量为20米~3/吨,煤层透气系数:软煤为0.036米~2/大气压~2·日,硬煤为0.005米~2/大气压~2·日。整个工作面的原始瓦斯储量约717万米~3。
I. General Situation 611 The working face is located at the level of-90 ~ -100 in the eastern part of the Tianguan District of Leefang Mine. The coal seam dip angle is 6 ° -8 ° and the coal thickness is 6 meters. The working face is 370 meters in length and 70-110 meters in tilt length Excluding the coal pillars being mined at the same time). The gas content of this mining area is 20-3 m 3 / t. The gas permeability coefficient of coal seam is 0.036 m 2 / atmospheric pressure to 2.2 days for soft coal and 0.005 m 2 / atmospheric pressure to 2 days for hard coal. The entire face of the original gas reserves of about 7.17 million meters ~ 3.