寒区特长隧道斜井对隧道内温度影响实测研究  

Field Observations on Influence of Inclined Shaft on Temperature Characteristics within an Extra-long Tunnel in Cold Regions

作　　者：刘杰 朱小明 李晓民 张坤 樊江 曹贵 穆彦虎 郑波[5] LIU Jie;ZHU Xiaoming;LI Xiaoming;ZHANG Kun;FAN Jiang;CAO Gui;MU Yanhu;ZHENG Bo(Gansu Highway Traffic Construction Group Co.Ltd,Lanzhou,Gansu 730000,China;Gansu Province Transportation Planning,Survey&Design Institute Co.Ltd,Lanzhou,Gansu 730030,China;Northwest Minzu University,Lanzhou,Gansu 730124,China;State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou,Gansu 730000,China;Southwest Research Institute Co.Ltd.of C.R.E.C.,Chengdu,Sichuan 611731,China)

机构地区：[1]甘肃省公路交通建设集团有限公司,兰州730000 [2]甘肃省交通规划勘察设计院股份有限公司,兰州730030 [3]西北民族大学,兰州730124 [4]中国科学院西北生态环境资源研究院,兰州730030 [5]中铁西南科学研究院有限公司,成都611731

出　　处：《铁道工程学报》2024年第1期67-75,共9页Journal of Railway Engineering Society

基　　金：甘肃省科技计划项目(22ZD6FA004,22JR5RA047);甘肃省交通厅科技项目(2023-15);中国中铁股份有限公司科技研究开发计划项目(2021-重大-19)。

摘　　要：研究目的:寒区隧道内温度分布是保温设计和冻害防治的关键和前提,其影响因素可归纳为三类,即环境气象、工程结构以及交通因素。相较于环境气象和交通因素,目前针对工程因素,尤其特长隧道通风设施对隧道内温度分布影响的研究不足。结合青藏高原东南缘某高速公路特长隧道,系统开展了隧址区环境气象与不同建设阶段隧道内气温的空间分布与季节变化的连续观测,重点论述了通风斜井对隧道内温度环境的影响。研究结论:(1)隧道贯通前,洞内通风差,环境气温对隧道内温度的影响进深为300~400 m,隧道洞口段气温年平均值和振幅随进深增加呈指数形式增加和减小;(2)隧道开挖至斜井并与其连通后,在烟囱效应作用下,冷季时自进口至斜井形成稳定的单向风,洞内气温基本呈线性分布,梯度约为0.5℃/100 m;(3)隧道贯通后,冷季时斜井烟囱效应引发隧道内形成稳定的自进口、出口至斜井的双向通风,洞内温度呈现基本以斜井为中心的对称分布,全隧道范围内出现显著负温;(4)通风斜井对隧道内温度分布规律及负温段长度均有显著的影响,在寒区隧道保温设防和冻害防治中应予以考虑。Research purposes:Temperature distribution in cold region tunnels is the key of thermal insulation design and frost damage prevention.Factors affecting the temperature distribution in cold region tunnels can be summarized into three categories as meteorological environment,engineering structures and traffic factors.Compared with factors related to meteorological environment and traffic,there are few studies focusing on the influence of engineering factors on the temperature distribution characteristics,especially ventilation facilities of long and extra-long tunnels.Taking an extra-long highway tunnel in the southeast margin of the Qinghai-Tibet Plateau as example,the meteorological environment of the construction site and the spatial distribution and seasonal variations of air temperature along the tunnel during the construction process were observed continuously.The influence of inclined shaft on the temperature distribution along the tunnel was discussed based on the field-observed data.Research conclusions:(1)Before the tunnel was break through,the ventilation was poor,the influence distance of outside air temperature on the air temperature within the tunnel was 300~400 m from the portal.The annual average and amplitude of air temperature within the entrance section increased and decreased exponentially,respectively,with the increase in the distance from the entrance.(2)After the tunnel was dug to the inclined shaft and connected between each other,a stable one-way ventilation was developed from the entrance to the inclined shaft in cold season due to chimney effect of the shaft.Then,the air temperature in the tunnel presented a linear distribution and the temperature gradient was about 0.5℃/100 m.(3)After the tunnel was break through,chimney effect of the inclined shaft led to a stable two-way ventilation from the inlet and outlet to the inclined ventilation shaft in cold season.The temperature in the tunnel presented a symmetrical distribution with the inclined shaft as the axis of symmetry,and significan

关 键 词：寒区隧道 通风斜井 温度分布 烟囱效应 现场监测 

分 类 号：G311[文化科学]