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
陈万红 1余沛 2王湛 2唐智 3方正3
作者信息
- 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. 武汉大学 土木建筑工程学院,湖北 武汉 430072;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
- 折叠
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∆Tx/∆Tmax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.
Abstract
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-tenuation ∆Tx/∆Tmax 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Key words
double-deck road tunnel/branch pipe exhaust smoke/scale experiment/temperature distribution引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据