瓦斯赋存主控因素对突出煤层开采的影响效应

Influential Effect of Main Controlling Factors of Gas Occurrence on Outburst Coal Seam Mining

为获知地质因素对突出煤层开采的影响,采用瓦斯地质控制理论分析了井田3号煤层瓦斯赋存规律,得到井田构造和煤层埋深是控制煤层瓦斯含量和煤层应力分布的主要因素。在构造控制区的3510回采工作面和埋深控制区的3301回采工作面测定了煤层开采期间的工作面绝对瓦斯涌出量、回风流瓦斯浓度,以及消突效果检验指标钻屑量S和解吸量△h_2等参数。考察表明:韩山背斜构造易于瓦斯封闭和应力叠加,非构造区的参数测试值较构造区大幅度减小,韩山构造为该矿井防控煤与瓦斯突出的重点区域;随着煤层埋深增加,煤层瓦斯含量和煤层应力的显著增大也促进参数测值呈现大幅度增加规律。

In order to know the influence of geological factors on outburst coal mining, the gas geological control theory was used to analyze coal seam gas occurrence law for No. 3 coal seam. Mine structure and coal seam buried depth are the main influencing factors of coal seam gas content and stress of coal seam mining. The absolute gas emission, gas concentration, the drill cuttings S and the amount of gas desorption △h_2 were determined in 3510 and 3301 working faces. The 3510 working face is tectonic control area and 3301 working face is buried depth control area. The results show that the anticline structure of Hanshan is beneficial to gas sealing and stress superposition, which is the key to prevent coal and gas outburst. The measuring parameters in structural area are much higher than that in atectonic area. With the increase of buried depth of coal seam, coal seam gas content and coal seam stress increase significantly.