薄煤层沿空留巷内抽放下邻近层瓦斯

龙煤集团七台河分公司煤层薄,煤层透气性系数低,常用的抽放方法:仰角抽放、高位抽放、本煤层迈步式抽放。仰角、高位抽放,对于上邻近层、采空区瓦斯涌出量大的采煤工作面,解决瓦斯问题有较好的效果;但当下邻近层瓦斯压力大,向开采层涌出大量瓦斯,造成采煤工作面瓦斯超限时,则没有对下邻近层进行抽放的有效方法。通过薄煤层沿空留巷内打钻抽放下邻近层,解决了因下邻近层瓦斯涌出量大造成回采工作面回风或上隅角瓦斯超限的问题,经济效益显著。

Gas Drainage of Lower Adjacent Seam in Gob-side Entry Retaining of Thin Coal Seam Roadway

The coal seam is thin in Qitaihe branch of Longmei group,gas permeability coefficient of coal seam is low,the commonly used drainage method: angle of elevation drainage,high-located drainage,the coal seam stepped type drainage.The angle of elevation and high-located drainage,to the coal mining face which upper adjacent layer and goaf gas emission quantity is large solve the gas problem it has better effect,but when the gas pressure of lower adjacent layer is large,gushed out a large gas to mining layer,caused gas content over-limitation in coal mining face,there is no effective method to gas drainage of lower adjacent layer.Through drilling and drainage gas of lower adjacent layer in the thin coal seam gob-side entry retaining,solves the gas content over-limitation of return air or upper corner in mining face because the large gas emission of lower adjacent layer cause and the economic benefits are remarkable.