寒区长大隧道温度实测与仿真

发布时间：2018-06-06 02:50

  本文选题：铁路隧道 + 长大隧道　； 参考：《北京交通大学学报》2017年01期

【摘要】：基于现场实测数据对寒区长大隧道内温度的变化规律进行了分析,基于数值仿真分析对不同环境气温、围岩原始地温、自然风速、列车运行速度和频率条件下隧道洞内温度场和冻结深度的变化规律及保温层的适用范围进行了研究.研究结果表明:若环境气温或围岩原始地温低,自然风速大,或列车运行速度大和运行频率高,则洞内可能出现负温分布,所以寒区长大隧道结构防寒不应仅在洞口段;保温层法不能完全解决寒区长大隧道洞口保温问题,当环境气温低于15℃,持续冻结时间超过45d时,需要采取主动保温措施.
[Abstract]:Based on the field measured data, the variation law of temperature in the long tunnel in cold region is analyzed. Based on the numerical simulation, the temperature of different environment, the original ground temperature of surrounding rock, and the natural wind speed are analyzed. The variation law of temperature field and freezing depth in tunnel and the applicable range of insulation layer are studied under the condition of train speed and frequency. The results show that if the ambient air temperature or the original ground temperature of surrounding rock is low, the natural wind speed is large, or the train running speed and running frequency are high, the negative temperature distribution may occur in the tunnel, so the cold prevention of the tunnel structure in cold region should not be only in the section of the tunnel entrance; The insulation layer method can not completely solve the problem of insulation at the entrance of long tunnel in cold region. When the ambient temperature is lower than 15 鈩，

本文编号：1984721