| 超长距离盾构隧道疏散通道加压送风系统研究 |
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| 引用本文： | 谢宝超,楚坤坤,赵家明,鲁志鹏,张忆,徐志胜.超长距离盾构隧道疏散通道加压送风系统研究[J].中国安全生产科学技术,2021,17(11):137-143. |
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| 作者姓名： | 谢宝超 楚坤坤 赵家明 鲁志鹏 张忆 徐志胜 |
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| 作者单位： | （1.中南大学 防灾科学与安全技术研究所，湖南 长沙 410000；2.中铁第四勘察设计院集团有限公司，湖北 武汉 430063） |
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| 基金项目： | 作者简介: 谢宝超，博士，副教授，主要研究方向为结构抗火、火灾烟气流动与控制、火灾疏散与应急管理。 |
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| 摘 要： | 为确保隧道火灾时人行疏散通道安全性，通过在人行疏散通道两端设置独立机械加压送风系统，使疏散通道保持正压状态，防止烟气侵入。利用风速法计算疏散通道加压送风量，利用FDS软件模拟计算单侧及双侧2种送风方式下隧道内烟气蔓延范围、疏散口及疏散通道气流速率分布情况。结果表明:对疏散通道加压送风时，应重点分析火源附近150 m范围内疏散口气流速率是否符合规范要求；当开启疏散口数量≤10时，采用单侧或双侧送风方式对疏散通道加压送风，疏散口稳定时气流速率均符合规范要求；采用双侧送风方式疏散口气流速率分布规律较优，确保加压送风系统适用性。
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| 关 键 词： | 超长距离 盾构隧道 疏散通道 加压送风 疏散口开启数量 |
Study on pressurized air supply system for evacuation passage of super long distance shield tunnel |
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| XIE Baochao,CHU Kunkun,ZHAO Jiaming,LU Zhipeng,ZHANG Yi,XU Zhisheng.Study on pressurized air supply system for evacuation passage of super long distance shield tunnel[J].Journal of Safety Science and Technology,2021,17(11):137-143. |
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| Authors: | XIE Baochao CHU Kunkun ZHAO Jiaming LU Zhipeng ZHANG Yi XU Zhisheng |
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| Affiliation: | (1.Institute of Disaster Prevention Science and Safety Technology,Central South University,Changsha Hunan 410000,China;2.China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan Hubei 430063,China) |
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| Abstract: | In order to ensure the safety of pedestrian evacuation passage in case of tunnel fire,the independent mechanical pressurized air supply system can be set at both ends of pedestrian evacuation passage to keep the evacuation passage in the positive pressure state to prevent the smoke intrusion.The pressurized air supply volume of evacuation passage in an underwater shield tunnel was calculated by using the wind speed method,and the single side and double sides air supply modes of the evacuation passage were simulated by using FDS software.The smoke spread range in the tunnel,the air flow velocity distribution of the evacuation exit and evacuation passage under the two air supply modes were compared and analyzed.The results showed that when conducting pressurized air supply in the evacuation passage,it was necessary to focus on the analysis of whether the air flow velocity of evacuation exit within 150 m around the fire source met the requirements of specification.When the number of opening evacuation exits was less than or equal to 10,using the single side or double sides air supply modes to conduct the pressurized air supply of evacuation passage could make the stable air flow velocity of evacuation exits meet the specification requirement of 0.7 m/s.When adopting the double sides air supply mode,the air flow velocity of pressurized air supply outlet satisfied the specification requirement,and the distribution law of air flow velocity at the evacuation exit was better,which can effectively ensure that the air flow velocity of evacuation exit met the specification requirement.In order to ensure the applicability of the pressurized air supply system,it was recommended to adopt the double sides air supply mode. |
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| Keywords: | super long distance shield tunnel evacuation passage pressurized air supply number of opening evacuation exits |
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