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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

41卷

期数:

2024年02期

页码:

143-152

栏目:

桥隧工程

出版日期:

2024-03-30

文章信息/Info

Title:

Temperature field distribution characteristics in cold region tunnels and surrounding rock and analysis of influencing factors

文章编号:

1673-2049(2024)02-0143-10

作者:

李 刚¹,钟小春²

(1. 青海省交通工程技术服务中心,青海 西宁 810008; 2. 中铁五局集团第一工程有限责任公司,湖南 长沙 410117)

Author(s):

LI Gang¹, ZHONG Xiaochun²

(1. Qinghai Traffic Engineering Technology Service Center, Xining 810008, Qinghai, China; 2. China Railway Fifth Bureau Group First Engineering Co., Ltd., Changsha 410117, Hunan, China)

关键词:

寒区隧道;  温度场;  数值模拟;  CFD;  初始地温;  围岩热物理参数

Keywords:

cold region tunnel;  temperature field;  numerical simulation;  CFD;  initial ground temperature;  thermal physical parameter of surrounding rock

分类号:

U457

DOI:

10.19815/j.jace.2022.08039

文献标志码:

A

摘要:

中国高纬度、高海拔地区的隧道数量越来越多,在隧道实际运营过程中发生了不同程度的冻害,给隧道结构及公共交通带来隐患,因此冻害防治刻不容缓。通过建立寒区隧道三维传热模型,对寒区隧道温度场分布规律进行研究,讨论了初始地温、围岩密度、导热系数及比热容对温度场的影响,并对其影响程度进行了比较。结果表明:洞外低温空气是引起隧道内温度场发生显著变化的主要因素,导致隧道围岩出现径向变温圈,在自然风作用下(2 m?s^-1,-10 ℃),初始地温为10 ℃的隧道围岩变温深度达到了8 m; 初始地温对运营期的隧道温度场有着直接影响,初始地温每升高5 ℃,运营期围岩温度增大2.5 ℃; 隧道围岩温度与围岩比热容、密度呈正相关,但与导热系数的关系和隧道径向距离有关,径向距离小于1.3 m时,呈正相关,反之呈负相关; 采用灰色关联分析法得到的隧道温度场的影响敏感性从大到小排序依次为初始地温(1)、围岩密度(0.74)、围岩导热系数(0.71)、围岩比热容(0.68),可见初始地温对温度场的影响最大。

Abstract:

There are more and more tunnels in high latitude and high altitude areas in China, and different degrees of frost damage problems have occurred during the actual operation of the tunnels, which bring hidden dangers to the tunnel structure and public transportation, and the prevention and control of frost damage should not be delayed. A three-dimensional tunnel heat transfer model was established to study the distribution of temperature fields in cold region tunnels, and the effects of initial ground temperature, surrounding rock density, thermal conductivity, and specific heat capacity on the temperature field as well as the degrees of their effects were discussed and compared. The results show that the low-temperature air outside the tunnel is the main factor causing significant changes in the temperature field inside the tunnel, leading to radial warming circles in the tunnel surrounding rock. The depth of warming of the tunnel surrounding rock with an initial ground temperature of 10 ℃ reaches 8 m under the effect of natural winds(2 m?s^-1,-10 ℃). The initial ground temperature has a direct influence on the temperature field of the tunnel. The initial ground temperature increases by 5 ℃, the temperature of the surrounding rock increases by 2.5 ℃ during the operation period. The temperature of surrounding rock in tunnel is positively correlated with the specific heat capacity and density of the surrounding rock, but the relationship with the thermal conductivity is related to the radial distance, when the radial distance is less than 1.3 m, they are positively correlated, and vice versa, they are negatively correlated. Finally, the gray correlation analysis was used to compare the sensitivity of their effects on the tunnel temperature field. The order of sensitivity influence from large to small is: initial ground temperature(1), density of the surrounding rock(0.74), surrounding rock thermal conductivity(0.71), specific heat capacity of the surrounding rock(0.68), which shows that the initial ground temperature has the greatest influence on the temperature field. The research results can support the anti-freezing design of tunnels in cold regions.

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备注/Memo

备注/Memo:

收稿日期:2023-08-09
基金项目:青海五矿中铁公路建设管理有限公司项目(2020-XC2-FW-005)
作者简介:李 刚(1977-),男,高级工程师,E-mail:437757659@qq.com。

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