支管排烟作用下双层隧道顶棚温度分布试验研究  

Experimental study on ceiling temperature distribution under branch pipe smoke exhaust in double⁃deck tunnel

作　　者：陈万红 余沛 王湛 唐智[2,3] 方正 Chen Wanhong;Yu Pei;Wang Zhan;Tang Zhi;Fang Zheng(Wuhan Fire and Rescue Division,Hubei Wuhan 430072,China;School of Civil Engineering,Wuhan University,Hubei Wuhan 430072,China;Engineering Research Centre of Urban Disasters Prevention and Fire Rescue Technology of Hubei Province,Hubei Wuhan 430072,China)

机构地区：[1]武汉市消防救援支队,湖北武汉430072 [2]武汉大学土木建筑工程学院,湖北武汉430072 [3]湖北省城市综合防灾与消防救援工程技术研究中心,湖北武汉430072

出　　处：《消防科学与技术》2024年第4期475-481,共7页Fire Science and Technology

基　　金：国家自然科学基金资助项目(52376122)。

摘　　要：针对下层隧道采用支管排烟模式的双层盾构隧道,通过开展缩尺寸模型试验对烟气温度分布进行系统研究,探讨火源功率、排烟口开启方案(排烟口数量和距离)和排烟量等关键因素对火灾烟气温度分布的影响。结果表明:随着排烟口距离的增加,顶棚烟气温度逐渐升高;开启距离火源最近的两个排烟口时,顶棚烟气温度最低;随着排烟量的增大,在远离火源的区域顶棚烟气温度逐渐降低;火源上下游顶棚下方温度沿隧道纵向呈现指数衰减规律,在不同的排烟量和火源功率下,相对温度衰减ΔT_(x)/ΔT_(max)的值变化不大。通过对试验数据进行拟合分析,推导出支管排烟模式下,火源上下游顶棚烟气温度纵向衰减预测模型。Aiming at the double⁃deck shield tunnel with branch pipe exhaust mode in the lower tunnel,a reduced size model ex⁃periment was carried out to systematically study the smoke tem⁃perature distribution under branch pipe exhaust mode,and the in⁃fluence of key factors such as fire source power,smoke outlet opening scheme(number and distance of smoke outlet)and smoke exhaust volume on the fire smoke temperature distribution was discussed.The results show that the ceiling smoke temperature gradually decreases with the increase of smoke exhaust volume,and gradually increases with the increase of the distance of smoke exhaust outlets in the area away from the fire source.The ceiling smoke temperature is the lowest when the two vents closest to the fire source are opened.The temperature below the upper and lower ceiling of the fire source presents an exponential attenuation law along the longitudinal tunnel,and the relative temperature at⁃tenuationΔT_(x)/ΔT_(max) has little change under different smoke emission and fire source power.Based on the fitting analysis of the experimental data,the longitudinal attenuation prediction model of ceiling smoke temperature of upstream and downstream of the fire source is derived.

关 键 词：双层公路隧道 支管排烟 缩尺试验 温度分布 

分 类 号：X913.4[环境科学与工程—安全科学]