摘要
针对深中通道长大沉管隧道运营期内结构温度荷载以及通风环境优化等问题,在充分调研获取工程区域大气温度昼夜变化及其季节性差异、预期交通流量等数据的基础上,分别建立深中通道区域大气温度年度及昼夜分布叠加计算模型、昼夜车流峰值分布模型、隧道一维空气换热模型。在此基础上,根据热力学原理并综合考虑隧道内部热源特征和洞口温度时变边值问题,建立隧道内任意长度位置x上微元体的一维热传导纵向温度分布微分方程。采用卷积方法,获得长大隧道的第一类有限边界(温度)条件下内部有热源的热传导方程的理论解。研究了长大隧道运营期内部空气温度的季节性变化特性及其与车流量、通风量等内部热源参数的相关性。结合深圳地区区域大气温度特征、隧道工程几何特征、通风方式及结构导热条件,实施了长大沉管隧道纵向温变状态预测与分析。结果表明:隧道内空气温度分布与车辆流量、洞口大气温度密切相关,变化规律呈现年度长周期和昼夜短周期叠加模式;在车流分布特征和洞口大气温度季节性变化条件下,隧道控温所需的供风量存在较大的取值区间,且供风量合理取值随车流及环境温度的变化呈现近似周期性变化。
In view of the problems of structural temperature load and ventilation environment optimization during the operation period of the long immersed tube tunnel in Shenzhen-Zhongshan corridor, based on full investigation and acquisition of the day and night variation of atmospheric temperature, seasonal difference, expected traffic volume and other data in the project area, the superposition calculation model of the annual and day and night distributions of atmospheric temperature, the peak distribution model of day and night traffic volume, and the 1 D heat transfer model of the tunnel in the Shenzhen-Zhongshan corridor area are established respectively. On this basis, according to the principle of thermodynamics and considering the characteristics of the heat source inside the tunnel and the time-varying boundary value problem of the temperature at the entrance, the differential equation of 1 D longitudinal temperature distribution of heat conduction of micro elements at any length position x in the tunnel is established. The theoretical solution of the heat conduction equation with internal heat source under the first kind of finite boundary(temperature) condition of long tunnel is obtained by using convolution method. The seasonal variation characteristics of internal atmospheric temperature and its correlation with internal heat source parameters such as traffic volume and ventilation volume during long tunnel operation period are studied. Combining with the regional atmospheric temperature characteristics, the geometric characteristics, the ventilation mode and the structural heat conduction conditions of tunnel engineering in Shenzhen, the longitudinal temperature change state of the long immersed tube tunnel are predicted and analysed. The result shows that(1) the atmospheric temperature distribution in the tunnel is closely related to the vehicle volume and the atmospheric temperature at the entrance of the tunnel, the variation rule presents a superimposed pattern of long annual cycle and short day and nigh
作者
陈伟乐
王颖轶
金文良
CHEN Wei-le;WANG Ying-yi;JIN Wen-liang(Guangdong Highway Construction Co.,LTD,Guangzhou Guangdong 510030,China;Shanghai Jiao Tong University,Shanghai 200240,China;Shenzhen-Zhongshan Channel Management Center,Zhongshan Guangdong 528400,China)
出处
《公路交通科技》
CAS
CSCD
北大核心
2022年第9期116-124,共9页
Journal of Highway and Transportation Research and Development
基金
国家重点研发计划项目(2018YFC0809600)。
关键词
隧道工程
温度边界叠加模型
热源模型化
换热模式及理论解
隧道轴向温度
热源状态相关性
tunnel engineering
temperature boundary superposition model
heat source modeling
heat transfer mode and theoretical solution
tunnel axial temperature
heat source state correlation
