油气型高瓦斯隧道贯通后至运营前瓦斯涌出量预测研究  

Research on the Prediction of Gas Emission from After Completion of Oil-High Gas Tunnels to Before their Operations

作　　者：张孝广 ZHANG Xiaoguang(China Coal Technology Engineering Group Chongqing Research Institute,Chongqing 400039,China)

机构地区：[1]中煤科工集团重庆研究院有限公司,重庆400039

出　　处：《交通工程》2020年第4期75-80,共6页Journal of Transportation Engineering

摘　　要：高瓦斯隧道混凝土衬砌完毕后由于衬砌细微孔隙、“三缝”及预留泄水孔道的存在,易受地层中瓦斯渗出侵袭,对后期运营安全构成威胁.本文对龙泉山油气型隧道运营前在自然通风状态瓦斯渗出源统计分析并采用渗透系数法对渗出量核算,泄水孔、施工缝为主要瓦斯渗出源,全隧瓦斯渗出量约为0.559 m^3/min,瓦斯安全评估为隧道内自然风速低于0.05 m/s时,瓦斯浓度易达0.3%预警值,为安全考虑仍需安设机械风机供风.After completion of concrete lining in high-gas tunnels,due to the presence of fine pores in the lining,"three cracks"and reserved drainage channels,it is susceptible to gas seepage and invasion in the stratum,which poses a threat to the safety of later operations.This paper made a statistical analysis of the gas seepage sources in the natural ventilation state before operation and used the permeability coefficient method to calculate the Gas emission quantity,drainage holes,construction joints as the main source of gas leakage,the whole tunnel gas emission quantity is about 0.559 m 3/min.The gas safety assessment indicates that the gas concentration in the tunnel is easily reached to the advance warning value of 0.3%when the natural wind speed is lower than 0.05 m/s.For safety consideration,it is still necessary to install mechanical fans for ventilation.

关 键 词：油气型隧道 瓦斯预警 瓦斯渗出源 瓦斯涌出量 

分 类 号：U25[交通运输工程—道路与铁道工程]