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中文摘要：
在分析影响隧道瓦斯浓度主要因素的基础上,以掘进长度200m为例,选取风筒直径、风筒口距掌子面的距离以及风筒悬挂位置3个主要影响因素,并选取合理的水平进行正交试验设计;依据重庆某瓦斯隧道施工参数,建立了瓦斯隧道施工通风数值模拟模型;采用多轮正交数值模拟试验方法,获得各因素对隧道瓦斯浓度影响的重要性顺序和风筒最优化设置方案,并对风筒最优化设置方案进行现场试验验证。结果表明：在风量大小、瓦斯溢出量、瓦斯溢出位置一定的前提条件下,影响隧道掌子面瓦斯浓度因素的主次顺序依次为风筒直径、风筒悬挂位置、风筒口距掌子面距离;风筒优化设置后现场瓦斯浓度降低了37%,且隧洞内各处瓦斯浓度低于0.5%,符合规范要求。
英文摘要：
Based on the analysis result of primary factors influencing gas concentration of tunnel,taking tunneling length of 200 meters as an example,three impact factors were selected,which were diameter of air duct,the distance from venting duct to tunnel face and the position where air duct hangs,and reasonable levels were chosen to carry out an orthogonal experimental design.A numerical simulation model of construction ventilation of gas tunnel was established based on construction parameters of a Chongqing gas tunnel.With several rounds of orthogonal numerical simulation experiment method,the importance sequence of each impact factor on gas concentration of tunnel and the most optimized setting of air duct were obtained and the optimized solution was verified through experiment.The results show that under the fixed condition of air volume,gas pressure and gas overflow quantity,the importance sequence of impact factor is diameter of air duct,the position where air duct hangs and the distance from venting duct to tunnel face.The gas concentration is reduced by 37% and below 0.5% in the tunnel after optimizing air duct setting,which is conformed to the requirements of the specification.
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