立新煤矿蛇形山井各煤层都具有煤与瓦斯突出危险,煤层赋存很不稳定,构造复杂,煤质松软,硬度系数 f=0.3～0.6,透气性系数低,λ为0.005米~2/大气压~2·日左右,吨煤瓦斯含量30米~3。长期以来由于瓦斯威胁,掘进进度慢,采掘严重失调,更谈不上掘抽采平衡。因此,寻求有效地预抽煤层瓦斯的方法,是我们的当务之急。 The coal seam and gas outburst danger occur in all the coal seams of the Serpentine Shaft in Lixin Coal Mine. The coal seam is very unstable and has a complex structure with soft coal with hardness f = 0.3-0.6, low permeability coefficient and λ of 0.005-2 / bar ~ 2 · day or so, tons of coal gas content of 30 meters ~ 3. For a long time due to the threat of gas, slow progress of excavation, mining a serious imbalance, let alone mining pumping mining balance. Therefore, it is imperative for us to seek ways to effectively pre-mine coal-bed methane.