摘要
为探明桐梓隧道穿越煤层煤与瓦斯突出风险性,布置参数井查明隧道所在区域地层、构造、煤层以及煤层气储层特征.分析结果表明:钻遇煤层7层,煤层厚度大于0.3m有4层,煤类为贫煤,C3、C6煤层为有煤尘爆炸性,煤层隧道附近瓦斯含量3.10～11.29m3/t,C3、C5、C6、C7煤层瓦斯压力均大于1.0MPa,瓦斯放散初速度均大于10mmHg,C3、C5、C6、C7煤层具有煤与瓦斯突出危险性.钻探分析结果为该地区类似工程提供参考和借鉴.
Abstract
To investigate the risk of coal and gas outburst in the Tongzi Tunnel crossing coal seams,parameter wells were arranged to identify the geological strata,structures,coal seams,and coal-bed methane reservoir characteristics in the tunnel area.The analy-sis results show that there are a total of 7 coal seams encountered during drilling,including 4 with a thickness greater than 0.3 m.The coal type is lean coal,and the C3 and C6 coal seams have ex-plosive coal dust.The gas content near the coal seam tunnel is 3.10-11.29 m3/t.The gas pressure of the C3,C5,C6,and C7 coal seams is all greater than 1.0 MPa,and the initial velocity of gas release is all greater than 10 mmHg.The C3,C5,C6,and C7 coal seams have a risk of coal and gas outburst.The drilling analysis results provide reference and inspiration for similar projects in the region.
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