(2.招商局重庆交通科研设计院有限公司, 重庆 400067)
【摘要】为了解沉管隧道火灾发生时其周围温度场的分布规律及其影响因素, 建造沉管隧道试验平台, 采用1∶1足尺火灾试验和FDS数值仿真计算相结合的方法, 对沉管隧道火灾发生时隧道内温度场的分布规律进行系统研究, 得到如下结论:1) 隧道发生火灾时, 一定的纵向风速可有效降低拱顶最高温度;2) 不同火源类型对火灾拱顶最高温度和火势发展影响较大;3) 50 MW火灾下, 洞内设备耐高温的安全位置为边墙高度3.5 m以下;4) 火灾最高温度与火源规模、纵向风速均呈正相关。
【关键词】 沉管隧道;足 (全) 尺寸实验;防灾减灾;油池火;木垛火;温度场;
Distribution Laws of Fire Temperature Fields in Immersed Tunnel: A Case Study of Hong Kong-Zhuhai-Macao Bridge Immersed Tunnel Project
(2.China Merchants Chongqing Communications Technology Research & Design Institute Co., Ltd., Chongqing, China 400067)
【Abstract】The large testing platform for immersed tunnel is established to analyze the distribution laws of the temperature field and its influencing factors when a tunnel fire breaks out. Meanwhile, the combination method of physical testing (1:1 full-scale fire test) and numerical calculation FDS are applied. Some conclusions are drawn as follows: (1) Longitudinal wind speed within limits can decrease the maximum temperature of tunnel crown top effectively when fire breaks out in tunnel. (2) The maximum temperature of tunnel crown top and fire behavior are related to fire types obviously. (3) The high temperature resistance safe position of the tunnel equipment is below 3.5 m of tunnel sidewall in case of fire source heat quantity of 50 MW. (4) The fire maximum temperature is positively related to heat release rate (HRR) and longitudinal wind speed.
【Keywords】 immersed tunnel; full-scale experiment; disaster prevention and mitigation; oil pool fire; wood crib fire; temperature field;
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