提高低透气性煤层抽排瓦斯量的试验研究

阳泉矿区首采3#煤层为严重突出煤层,共发生煤与瓦斯突出1600次,其中回采面突出占90%,给生产带来了极大的威胁。为了解决这一问题,提高本煤层预抽瓦斯的效果,在阳泉矿区试验采用了长钻孔控制预裂爆破和在工作面前方卸压带采用交叉钻孔抽放瓦斯的方法,结果表明该方法可以大幅度提高煤层的透气性,降低工作面瓦斯突出对生产和安全的威胁。

Study on Improving Gas Drainage Volume of Coal Seams with Low Gas Permeability

No.3 coal seam is a serious outburst seam in Yangquan Coal Mining Area and about 1600 outbursts successively occurred in this seam,90%of which occurred in the working faces,bringing serious threat to coal mine production.In order to solve this problem and raise gas pre-drainage effectiveness from the active seam,the gas pre-drainage method of controlled pre-splitting blasting by long boreholes and cross boreholes in the pressure-relief zone in front of the working face was tested and adopted in Yangquan Coal Mining Area. The results show that this method can greatly improve gas permeability of coal seams and reduce gas outburst threat in the faces to mine safety and production.