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中马村矿系煤与瓦斯突出矿井,矿井相对瓦斯涌出量平均30米~3/吨,单一厚煤层开采,无烟煤,煤层倾角7°～11°,倾斜长壁炮采工作面,陷落法管理顶板,2511工作面位于-174～193米水平之间,垂深320米左右,工作面走向长度430米,倾斜宽35～90米,采前查明该处大煤形成了两个分层。如图1所示,上分层煤厚0～3.81米,下分层煤厚1～2.9米,平均2.0米,两层煤间夹有5～17米的砂质页岩及砂岩。2511位于下分层中,掘进期间,一般掘进工作面绝对瓦斯量0.5～1.5米~3/分,平均1.0米~3/分,其掘进相对瓦斯涌出量平均24～32米~3/吨,没有发
MMA and gas outburst mines in Zhongmacun, with an average of 30m ~ 3 / t of gas emission, a single thick seam mining, anthracite, coal seam dip angle of 7 ° ~ 11 °, inclined longwall mining face, Management of the roof, 2511 face is located between the level of -174 to 193 meters, about 320 meters deep, face to the length of 430 meters, the width of 35 to 90 meters wide, the coal was found before the formation of two stratification . As shown in Figure 1, the upper strata are 0-3.8 meters thick and the lower strata are 1--2.9 meters thick with an average of 2.0 meters. Sandstone and shale are sandwiched between 5 and 17 meters between the two layers of coal. 2511 is located in the lower strata. During the excavation, the average gas drainage volume of the general heading face is 0.5-1.5 m / 3, with an average of 1.0-3 m / min. The average gas emission of the tunneling is 24-32 m 3 / t No hair