摘要
为探索冻害问题的解决方法,依托京沈高铁瓦房店隧道,以隧道洞口气象条件代替区域气象条件,在考虑洞口气流对隧道传热作用的基础上,研究隧道温度场及其影响因素。首先,采用现场实测数据,对原址隧道数值模型和计算方法进行正确性验证;然后,采用正交试验方法,完成风温、风速、时间和风向4个因素对温度场影响的敏感性分析;最后,探讨风向的夹角和交替变化对温度场的影响。结果表明:4个因素中风温最为敏感,风速次之,风向夹角虽然影响最弱,但却不可忽视;主导风向与隧道走向存在夹角时,同一横断面的2侧温度场存在显著差异,30°的风向夹角可造成大约8%的相对温差;不同风向夹角下,相对温差均呈现中间段>进口段>出口段的现象,且随着风向夹角的增大,相对温差相应增大,隧道整体降温效果相应减弱;以隧道中部断面衬砌背后拱顶部位作为考察点,单一风向工况下的温度比风向正反交替变化工况低约4℃,更易导致冻害发生。
To better explore the solution to the problem of freezing damage, based on the Wafangdian tunnel of Beijing-Shenyang high-speed railway, replacing the regional meteorological conditions with the tunnel-portal meteorological conditions, the tunnel temperature field and its influencing factors were studied considering the heat transfer effect of tunnel-portal airflow. Firstly, the correctness of the numerical model and calculation method was validated with field measured data. Then, the sensitivity of such factors as wind temperature, wind speed, time and wind direction to temperature field was analyzed by orthogonal test method. Finally, the influence of wind direction angle and the alternating change on temperature field was discussed in detail. Results show that wind temperature is the most sensitive factor, followed by wind speed. Wind direction angle is relatively insensitive factor, but it cannot be ignored. When there is an angle between the dominant wind direction and the tunnel direction, the temperature field on both sides of the same cross-section is significantly different. 30° wind direction angle can cause about 8% relative temperature differential effect. When the wind direction angles are different, the relative temperature differential is always the highest in the middle section,followed by that in the inlet section and that in the outlet section is the lowest. With the increase of wind direction angle, the relative temperature differential increases, and the overall cooling effect of the tunnel decreases. Taking the vault behind the lining of the middle section of the tunnel as the inspection point, the temperature under single wind direction is about 4 ℃ lower than that under the alternating wind directions,which is more likely to cause frozen damage.
作者
郑余朝
孙克国
司君岭
孟庆余
陈宇
张弛
ZHENG Yuchao;SUN Keguo;SI Junling;MENG Qingyu;CHEN Yu;ZHANG Chi(Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu Sichuan 610031,China;China Railway Design Co.,Ltd.,Tianjin 300251,China)
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2020年第6期81-90,共10页
China Railway Science
基金
国家自然科学基金资助项目(51678495)
中国铁路总公司科技研究开发计划课题(2014G004-M)。
关键词
隧道
季冻区
气流作用
温度场
正交试验
Tunnel
Seasonal frozen region
Action of airflow
Temperature field
Orthogonal test
