高瓦斯长大隧道施工通风模拟研究

根据不同隧道施工实际，长大隧道的通风通常选择压入式通风或者成本较高通风效果好的巷道式通风，二者有各自的优缺点。高效、经济的通风是保障高瓦斯隧道安全施工的关键因素之一，通风方式的选择至关重要，合理的通风方式能有效稀释瓦斯浓度，并能够节约施工成本。结合高瓦斯长大隧道工程实际，完成了该隧道施工通风参数计算，采用计算流体动力学软件Fluent构建了不同通风方式下瓦斯隧道施工通风数值分析模型。通过数值模拟，得到了隧道内风流流场分布规律及瓦斯浓度分布规律，为瓦斯隧道容易产生瓦斯积聚的地点并需重点检查的部位提供了指导依据，也为通风方式的选择提供了一定的理论基础。

Study on construction ventilation simulation of high gas，long and large tunnel

According to the actual construction of different tunnels，the ventilation of long and large tunnels usually chooses press-in ventilation or roadway ventilation with higher cost and better ventilation effect.Both have their own advantages and disadvantages.Efficient and economical ventilation is one of the key factors to ensure the safe construction of high gas tunnels.
The choice of ventilation method is very important.A reasonable ventilation method can effectively dilute the gas concentration and save construction costs.Combined with the actual construction of the high gas，long and large tunnel，the calculation of the ventilation parameters of the tunnel was completed.The calculation fluid dynamics software Fluent was used to construct the numerical analysis model of the gas tunnel construction ventilation under different ventilation modes.Through the numerical simulation，the wind flow field in the tunnel was obtained.The distribution law and the gas concentration distribution law provided guidance for the locations where gas accumulation was likely to occur in the gas tunnel and the locations that need to be inspected，and also provided a certain theoretical basis for the selection of ventilation methods.