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为了消除采煤工作面煤与瓦斯突出危险性,实现安全回采,新安煤矿在14221采煤工作面采用了本煤层平行钻孔抽放煤层瓦斯,抽放钻孔量为0.129m/t,采前瓦斯预抽率31.2%,采前残余瓦斯含量为0.84～6.78m3/t。根据《防治煤与瓦斯突出规定》采用钻孔指标法、残余瓦斯量法以及煤层瓦斯预抽率进行消突评价,并对评价结果的可靠性进行了分析,结果表明,该工作面为无突出危险性。同时根据现场情况,对该采煤工作面后期回采时所采取的防突措施提出了建议。
In order to eliminate the danger of coal and gas outburst in coal mining face and realize safe recovery, coal seam gas was drained by parallel coal seam in 14221 coal mining face of Xin’an Coal Mine, the drainage volume was 0.129m / t, Gas pre-pumping rate of 31.2%, pre-mining residual gas content of 0.84 ~ 6.78m3 / t. According to “Provisions on Preventing and Controlling Coal and Gas Outburst”, drilling index method, residual gas quantity method and gas pre-pumping rate of coal seam are used to evaluate the gas outburst, and the reliability of the evaluation result is analyzed. The results show that the working face is unobtrusive Dangerous. At the same time, according to the site situation, this section puts forward some suggestions on the outburst prevention measures adopted in the later mining of the coal mining face.