Abstract: In the process of gas tunnel boring, the heat emitted by various tunneling equipment and the high heat and high humidity environment caused by the use of wet cooling and dedusting equipment will have an impact on the movement law of harmful gases such as gas. Controlling the temperature and humidity of the tunnel environment in an appropriate range can not only improve the comfort of workers, but also help reduce the gas concentration along the length of the tunnel. Taking Jimingshan Tunnel as an example, the distribution law of gas in the tunnel and the influence of temperature and humidity environment on gas distribution in the tunnel were studied by using numerical simulation software such as Fluent, and the optimization range of temperature and humidity values was proposed. The results show that the change of temperature and humidity environment will not significantly change the distribution law of gas along the tunnel length. Only increasing the humidity value in the working area will reduce the gas concentration along the way. Only increasing the temperature value in the working area will cause the gas near the face of the tunnel to gather at the bottom. Under the combined action of temperature and humidity, the gas concentration at the bottom of the tunnel is higher than that at the top of the tunnel. Finally, the optimal humidity value of tunnel working environment is obtained by considering the optimal comfort level of human body and construction safety.

Key words: tunnel engineering；gas tunnel；tunnel ventilation；law of motion；temperature and humidity；numerical simulation

摘要： 在瓦斯隧道掘进过程中，各种掘进设备散发的热量以及使用湿式降温除尘设备所带来的的高热、高湿环境会对瓦斯等有害气体运动规律产生影响，控制隧道环境温湿度在合适的范围内既能提高工人的舒适程度，也有利于降低沿隧道长度方向上的瓦斯浓度。以鸡鸣隧道为例，利用Fluent等数值模拟软件分别研究了瓦斯气体在隧道中的分布规律以及温湿度环境对瓦斯在隧道中的分布所造成的影响，并提出了温湿度值的优化范围。结果表明：温湿度环境改变并不会明显改变瓦斯气体沿隧道长度的分布规律；仅增加工作区域内湿度值会降低沿程瓦斯浓度；仅增加工作区域内的温度值会使掌子面附近的瓦斯气体往隧道底部聚集；受温湿度联合作用下，工作区域内隧道底部的瓦斯浓度高于隧道顶部的瓦斯浓度。最后结合人体最佳舒适度以及施工安全性考虑，得出了隧道工作环境的最佳湿度值。

关键词: 隧道工程；瓦斯隧道；隧道通风；运动规律；温湿度；数值模拟