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当前国内外抽放瓦斯矿井,大多数是在煤层透气性较大或是有解放层开采抽邻近层的卸压瓦斯。对低透气性单一煤层抽放瓦斯的技术尚未找到有效措施,正处于研究和探索阶段,通过1982
At present, gas drainage at home and abroad is mostly gas pressure relief gas with high permeability in the coal seam or nearby mining in the liberated layer. No effective measures have been found for the technology of gas drainage from a single coal bed with low permeability and is in the stage of research and exploration through 1982