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七煤集团公司新建分公司,生产能力是200万吨/年。目前矿井开采深度较深,煤层厚度平均0.8米左右,属于薄煤层。煤层倾角6～10°,煤层赋含瓦斯量较大,无煤炭自然发火现象。如果掘进单独施工一条瓦斯尾排巷道,即双巷布置,万吨掘进率过高。为确保采煤正常回采,使上隅角及采空区涌出的瓦斯得到及时排放,当回采上区段煤时,在采煤工作面运输顺槽后路采用架木棚和码两道石墙结合,形成沿空留巷和预留瓦斯尾排巷,为下区段回采时,回风和排放瓦斯创造可靠条件。
Seven Coal Group, a new branch company, production capacity is 200 tons / year. At present, deep mining depth, seam thickness of about 0.8 meters on average, belonging to the thin seam. Seam angle of 6 ~ 10 °, the coalbed contains a large amount of gas, no spontaneous combustion of coal. If the tunnel alone construction of a tailrace laneway, that is, double lane layout, million tons of driving rate is too high. In order to ensure the normal mining of coal, the gas discharged from the upper corner and the goaf can be discharged timely. When coal mining on the section coal is carried out, The walls are combined to form gob-side entry retaining and reserved gas tailings and alleyways to create reliable conditions for return wind and gas drainage for the next section of mining.