Because gas drainage is strong in 3308 workface of Chengzhuang coal mine, stop production often takes place for above-the-common.

成庄煤矿3308综放面由于瓦斯排放量大，多次造成因瓦斯超限停产。

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We can conclude that the method that unites lower-sect coal stack method and mobile drainage method is an effective measure in the control of gas in the working face of high gas mine.

由此得出，降段煤垛与移动抽放相结合的方法是高瓦斯矿井回采工作面瓦斯治理的有效方法。

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The paper analyzes the prospect of CMM based on investigations on coal output, gas emission and changes of gas drainage quantity in mine areas in China.

文章在分析我国煤矿区煤炭产量、瓦斯涌出量、瓦斯抽放量变化的基础上，提出对我国煤矿区煤层气开发前景的分析。

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