Mechanical ventilation is the primary measure for cooling during construction of high geo-temperature tunnel. Based on heat transfer theory and characteristics of press-in ventilation, a comprehensive calculation model considering the influence of construction process is proposed, and the reliability of the model is verified by on-site test. The effects of duct leakage rate and thermal conductivity of different excavation length on temperature field distribution during construction ventilation were analyzed based on the prediction model. The following conclusions are drawn: As the excavation length increases, the duct outlet temperature first increases and then decreases. The duct outlet temperature is mainly affected by geo-temperature and boundary control temperature of working face, the air leakage rate and excavation length are not the main factors. The highest temperature in the duct is about 40 °C. The distance between the position of highest temperature and working face increases with the increase of excavation length and decreases with the increase of air leakage rate. With the increase of excavation length, the impact of thermal conductivity on outlet temperature of duct is first enhanced and then stabilized under the same excavation length. The heat-insulated duct can effectively reduce the outlet air temperature and prolong the service life of the duct, while minimizing the air leakage of the duct.

中文翻译：

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隧道施工通风温度场分析，重点关注管道泄漏和导热系数


机械通风是高地温隧道施工降温的主要措施。基于传热理论和压入通风特点，提出了考虑施工工艺影响的综合计算模型，并通过现场试验验证了模型的可靠性。基于预测模型，分析了不同开挖长度的风道泄漏率和导热系数对施工通风温度场分布的影响。得出以下结论：随着开挖长度的增加，风道出口温度先升高后降低。风道出口温度主要受地温和工作面边界控制温度影响，漏风率和开挖长度不是主要影响因素。管道内最高温度约为40℃。最高温度位置与工作面的距离随着开挖长度的增加而增大，随着漏风率的增加而减小。随着开挖长度的增加，相同开挖长度下导热系数对风道出口温度的影响先增强后趋于稳定。隔热风管可以有效降低出风温度，延长风管的使用寿命，同时最大限度地减少风管的漏风。