开采未保护区煤层综合防突技术

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基于大淑村煤矿2206面下保护层内煤柱影响而存在多块未保护区的开采条件,介绍了综放面防治煤与瓦斯突出的综合技术,涉及开采前在保护层内布置高位钻场抽采2煤瓦斯,在2煤内布置顺层及高位钻场抽采顶板瓦斯,在开采期间沿工作面全长注水湿润煤体,在未保护区域内施工瓦斯释放钻孔,煤与瓦斯突出危险钻孔预测预报。采取措施后,2206面开采区域内残存的瓦斯含量小于8m3/t,残存的瓦斯压力小于0.74MPa,达到了放顶煤开采的条件。预测预报钻孔煤粉量指标Smax值和钻屑瓦斯解析指标△h2值均明显小于突出危险临界值,表明未保护
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