盾构机外部失火隧道内烟气传播数值模拟  

Numerical simulation on spread of smoke in tunnel when fire takes place outside shield machine

作　　者：王新[1,2] 金先龙[1,2] 杨培中[1,2] 吴惠明[3] 

机构地区：[1]上海交通大学机械系统与振动国家重点实验室,上海200240 [2]上海交通大学机械与动力工程学院,上海200240 [3]上海隧道工程股份有限公司,上海200023

出　　处：《消防科学与技术》2010年第6期470-473,共4页Fire Science and Technology

基　　金：国家"863"高技术研究发展计划(2009AA01A131);国家自然科学基金(50875166);机械系统与振动国家重点实验室(MSV-MS-2008-09)

摘　　要：用FDS模拟不同通风条件及水幕开启/关闭状态的火灾过程,分析盾构机外部配电箱失火时隧道内的烟气传播规律,通过比较隧道内关键位置处的烟气体积分数、温度、二氧化碳体积分数、氧气体积分数及能见度,评估对隧道内工作人员安全的影响。结果证明,水幕可起到一定的阻烟作用和很好的隔热作用,能降低盾构机一侧的二氧化碳体积分数,并使得掘进面附近工作区域内的能见度变化很小;在通风条件下,风流会阻隔烟气到达掘进面附近;水幕的阻烟效果及通风充足使得隧道内的氧气体积分数基本不变。Through simulating the fire under different ventilation conditions as well as turn on/off the water curtain by FDS, the law of spread of smoke in tunnel when distribution box fire takes place outside shield machine is analyzed. By comparing the smoke volume fraction, temperature, carbon dioxide volume fraction, oxygen volume fraction and visibility of key position in tunnel, the effect of fire to staffs is assessed. Results show that the water curtain can block the smoke and heat, lower the carbon dioxide volume fraction, and level off the variability of the visibility near the tunneling surface; with good ventilation the wind can block the smoke from the tunneling surface; the water curtain together with the ventilation can stabilize the oxygen volume fraction.

关 键 词：隧道 火灾 烟气 水幕 FDS 

分 类 号：X924[环境科学与工程—安全科学] U459[建筑科学—桥梁与隧道工程]