Smoke Exhaust Structure Size Parameters and Smoke Exhaust Effect of Emergency Rescue Station in High-Altitude Railway Tunnel
王峰 1宋玺 1张路华 1方钱宝 2陈思宇2
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作者信息
1. 西南交通大学土木工程学院,四川成都 610031
2. 中铁二院贵阳勘察设计研究院有限责任公司,贵州贵阳 550002
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摘要
为明确高海拔铁路隧道紧急救援站排烟结构合理的尺寸参数,以某高海拔铁路特长隧道为工程依托,数值模拟并分析救援站联络排烟道数量、直径以及平行排烟道尺寸对排烟效率、站内温度和能见度的影响.结果表明:总体上距火源越近,排烟效率、拱顶及疏散站台温度越高,且火源前端能见度显著高于后端,但不同排烟结构参数下的具体分布规律差异显著;随着联络排烟道数量增加,救援站排烟效率略有增加,救援站后端拱顶温度显著降低,部分联络排烟道会出现烟气倒流,救援站疏散站台特征高度能见度低于10 m的范围显著增加;随着联络排烟道直径增加,救援站排烟效率及救援站两端拱顶温度均降低,救援站能见度显著下降;平行排烟道尺寸对救援站排烟效率及站内温度分布影响较小,但随着尺寸增加,救援站疏散站台特征高度能见度低于10 m的范围呈"先增后减"的变化趋势,紧急救援站内联络排烟道数量设置不宜过多,推荐联络排烟道直径为3 m,平行排烟道断面宽度为5 m.
Abstract
In order to clarify the reasonable size parameters of the smoke exhaust structure of the emergency rescue station in high-altitude railway tunnel,the effects of the number and diameter of connecting smoke exhaust duct,and size of parallel smoke exhaust duct on smoke exhaust efficiency,station temperature,and visibility in rescue station was numerically simulated and analyzed based on the extra-long tunnel project of a high-altitude railway.The results show that,overall,the closer to the fire source,the higher the smoke exhaust efficiency,the temperature of vault and evacuation platform,and the visibility at the front end of the fire source is significantly higher than that at the back end.However,there are significant differences in the specific distribution patterns under different smoke exhaust structure parameters.With the increase of the number of connecting smoke exhaust ducts,the smoke exhaust efficiency of the rescue station slightly increases,the vault temperature at the back end of the rescue station significantly decreases,some connecting smoke exhaust ducts may appear smoke backflow,and the range of visibility below 10 m at the characteristic height of the evacuation platform in the rescue station increases significantly.As the diameter of the connecting smoke exhaust duct increases,the smoke exhaust efficiency of the rescue station and the vault temperature at both ends of the rescue station both decrease,and the visibility of the rescue station decreases significantly.The size of parallel smoke exhaust duct has little effect on the smoke exhaust efficiency and temperature distribution in the rescue station,but as its size increases,the range of visibility below 10 m at the characteristic height of evacuation platform in the rescue station shows a change trend of"increasing first and then decreasing".The number of connecting smoke exhaust ducts in the emergency rescue station should not be too much.It is recommended that the diameter of connecting smoke exhaust duct be 3 m,and the cross-sectional width of parallel smoke exhaust duct be 5 m.
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