Abstract A wide geothermal anomalous zone exists around the Hengduan Mountains in China. The construction of railway tunnels in geothermal anomalous zones encounters the phenomenon of high geotemperature, which has serious impacts on personnel and equipment during the construction and operation of the tunnel. In this study, a convection-conduction model in a transverse section is built to represent a high-geotemperature tunnel with longitudinal ventilation. Taking the Gaoligongshan Tunnel as an example, the influence of ventilation frequency and longitudinal velocity on the ambient temperature in the tunnel is studied by numerical simulation. Then, a scale model test is carried out to study the temperature field of the surrounding rock and air flow in the tunnel with longitudinal ventilation. Finally, the experimental and numerical results are compared and analyzed. Results show that the mechanical ventilation frequency and ventilation velocity have a huge effect on the temperature field. In order to make the ambient temperature in the tunnel lower than 28 °C, the longitudinal velocity should not be less than 3.5 m/s and the ventilation frequency should not be less than 3 times a day. The experimental results have a good agreement with the numerical simulation results and validate the reliability of the numerical method.

中文翻译：

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高地温铁路特长隧道纵向通风降温

摘要 我国横断山脉周围存在着广阔的地热异常带。地热异常区铁路隧道施工遇到高地温现象，在隧道施工和运营过程中对人员和设备造成严重影响。在这项研究中，建立了横截面中的对流传导模型来表示具有纵向通风的高地温隧道。以高黎贡山隧道为例，通过数值模拟研究了通风频率和纵向速度对隧道内环境温度的影响。然后进行缩比模型试验，研究纵向通风隧道内围岩温度场和气流。最后，对实验和数值结果进行了比较和分析。结果表明，机械通风频率和通风速度对温度场影响巨大。为使隧道内环境温度低于28℃，纵向速度不小于3.5m/s，通风频率不小于每天3次。实验结果与数值模拟结果吻合较好，验证了数值方法的可靠性。5m/s，换气次数每天不少于3次。实验结果与数值模拟结果吻合较好，验证了数值方法的可靠性。5m/s，换气次数每天不少于3次。实验结果与数值模拟结果吻合较好，验证了数值方法的可靠性。