金能煤业分公司4331工作面石门揭煤时发生过动力现象,且4331回风巷处于上保护层未保护区域内,为了防止4331回风巷掘进过程中发生煤与瓦斯突出,结合区域瓦斯防治理论及该煤层低透气性特点,在回风巷掘进时采用连续流量法预测前方煤体的突出危险性,并采取超前排放孔、均匀布置预抽钻场等防突措施防治工作面煤与瓦斯突出,措施实施后再进行效果检验和区域验证,直到无突出危险为止。结果表明:应用局部防突技术后,4331回风巷掘进时回风流瓦斯体积分数为0.12%,消除了突出危险性,有效避免了煤与瓦斯突出事故。

A dynamic phenomena was occurred during a seam opening of the cross-cut in No.4331 coal mining face of Jinneng Coal Industry Branch. The ventilatio n gateway of No.4331 coal mining face was in a non-protected regional of the upper protected seam.In order to prevent coal and gas outburst occurred in the driving pr ocess of the ventilation gateway of No.4331 coal mining face, in combination with the regional gas prevention and control theory and the low permeability features of th e seam, during the driving process of the air returning gateway, a continuous flow method was applied to predict an outburst danger occurred in the front of the seam.A nd also the advance gas drainage boreholes, well-distributed pre-drainage drilling site and other outburst prevention measures were applied to prevent and control the coal and gas outburst occurred in the coal mining face .After these measures conducted, an effect inspection and regional verification should be conducted until no outb urst danger occurred.The results showed that after the technology applied to the driving face of the ventilation gateway of No.4331 coal mining face, the gas volume fra ction in the air returning flow was 0.12% during the gateway driving period.The outburst danger was eliminated and the coal and gas outburst accident could be effectiv ely avoided.