中文摘要：

为分析城市地下交通联系隧道（UTLT）发生火灾时的烟气流动情况,对隧道气流进行了整体的网络模拟计算;在考虑围护结构传热对气流温度和流量影响的基础上,建立了UTLT围护结构传热模型,分析并给出了围护结构的传热影响深度、初始温度分布、边界换热等定解条件的确定方法,导出了模型求解的离散方程组,并将围护结构传热计算融入网络计算模型。对某一城市地下交通联系隧道进行网络模拟计算,得到了该隧道温度分布、风量分布以及围护结构传热量。结果表明：围护结构传热对隧道内的风量和温度均有明显的影响,在模拟计算过程中不能忽略。

英文摘要：

In order to analyze the smoke flow situation of the urban traffic link tunnel（UTLT）under fire,network simulation calculation of tunnel airflow for the whole tunnel was carried out.Considering impact of heat transfer of envelope on the temperature and quantity of airflow,heat transfer model of UTLT envelope was established and the method to determine the definite conditions which included the influence depth of envelope heat transfer,the initial temperature distribution in envelope and the heat transfer on the boundary of envelope was proposed.Then discrete equations of the model were obtained and the calculation of heat transfer of envelope was integrated into network calculation models.Network simulation method was used to calculate the temperature distribution,airflow distribution,and heat flux of envelope of a UTLT in a city.The results show that heat transfer of envelope has a significant influence on the air quantity and temperature in the tunnel and it cannot be ignored in simulation calculation.