Ensuring adequate ventilation during tunnel construction is a critical issue that directly affects construction efficiency. A good ventilation environment can effectively guarantee the construction progress. In this paper, by repeatedly selecting the flow field simulation parameters and continuously summarizing the calculation methods, a reasonable model is selected to simulate the tunnel engineering. Specifically, the eddy current zone near the working face is obtained by analysing the flow field of forced ventilation tunnels. Furthermore, we analyse the dispersion and accumulation of harmful gases in the tunnel. The CO concentration at typical locations in the tunnel is also examined in order to determine areas with the lowest likelihood of harmful gas discharge. We then propose adding a jet fan to the tunnel to create an extraction plus ventilation tunnel. Simulation results reveal that the addition of a jet fan causes eddy currents that improve the extraction of harmful gases, thereby greatly reducing ventilation time and increasing efficiency. The results of the model can effectively guide the actual project, and help them save the construction time.

隧道施工期间确保足够的通风是直接影响施工效率的关键问题。良好的通风环境可以有效保证施工进度。本文通过反复选择流场模拟参数并不断总结计算方法，选择了合理的模型对隧道工程进行了模拟。具体而言，通过分析强制通风隧道的流场来获得工作面附近的涡流区。此外，我们分析了隧道中有害气体的扩散和积累。为了确定有害气体排放可能性最低的区域，还检查了隧道中典型位置的一氧化碳浓度。然后，我们建议在隧道中添加射流风扇，以创建抽风加通风隧道。仿真结果表明，添加喷气风扇会产生涡流，从而改善有害气体的提取，从而大大减少通风时间并提高效率。模型的结果可以有效地指导实际项目，并帮助他们节省施工时间。