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Temperature reduction for extra-long railway tunnel with high geotemperature by longitudinal ventilation

机译：纵向通风降低高地温超长铁路隧道的温度

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摘要

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 degrees 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.
机译：中国横断山脉周围存在着广泛的地热异常带。地热异常区铁路隧道的施工遇到地温高的现象，在隧道的建设和运营过程中对人员和设备造成严重影响。在这项研究中，建立了一个横断面对流传导模型来代表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环境温度的影响。然后，进行了比例模型试验，以研究纵向通风隧道中的围岩温度场和气流。最后，对实验结果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很大。为了使隧道内的环境温度低于28摄氏度，纵向速度应不小于3.5 m / s，通风频率应不小于每天3次。实验结果与数值模拟结果吻合良好，验证了数值方法的可靠性。

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