| 无纵向风下环境压强对拱顶最高温度影响数值研究 |
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| 引用本文： | 陶亮亮,张逸敏,刘振撼,付孝康,周小涵,曾艳华.无纵向风下环境压强对拱顶最高温度影响数值研究[J].隧道建设,2020,40(6):827-832. |
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| 作者姓名： | 陶亮亮 张逸敏 刘振撼 付孝康 周小涵 曾艳华 |
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| 作者单位： | （1. 西南交通大学 交通隧道工程教育部重点实验室， 四川 成都 610031; 2.
山西静兴高速公路有限公司，
山西 吕梁 033500； 3. 重庆大学土木工程学院， 重庆 400045) |
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| 基金项目： | 国家重点研发计划(2016YFC0802202)； 国家自然科学基金（51678502）； 重庆市博士后科学基金（cstc2019jcyj-bshX0072） |
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| 摘 要： | 为了给高海拔隧道火灾防灾救援设计提供参考依据，通过火灾动态模拟软件(FDS)建立全尺寸模型隧道，设置5种不同环境压强，研究环境压强对隧道火灾拱顶最高温度的影响。结果表明： 1)相同火源热释放速率(HRR)下，拱顶最高温度随着压强降低而增大； 2)环境压强降低引起的空气密度与卷吸强度变化是造成拱顶最高温度变化的主要原因。基于理论分析和数值计算结果，提出考虑环境压强的拱顶最高温度预测模型。预测模型拱顶最高温度与考虑环境压强的无量纲热释放速率的2/3次幂成正比，试验数据验证了预测模型的可靠性。
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Numerical Study on Influence of Ambient Pressure on
Maximum Temperature ofTunnel
Crown without Consideration of Longitudinal Velocity |
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| TAO Liangliang,ZHANG Yimin,LIU Zhenhan,FU Xiaokang,ZHOU Xiaohan,ZENG Yanhua.Numerical Study on Influence of Ambient Pressure on
Maximum Temperature ofTunnel
Crown without Consideration of Longitudinal Velocity[J].Tunnel Construction,2020,40(6):827-832. |
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| Authors: | TAO Liangliang ZHANG Yimin LIU Zhenhan FU Xiaokang ZHOU Xiaohan ZENG Yanhua |
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| Institution: | (1. Key Laboratory of Transportation Tunnel
Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China; 2. Shanxi Jingxing
Expressway Co., Ltd., Lüliang 033500, Shanxi, China; 3.
School of Civil Engineering, Chongqing University, Chongqing 400045, China) |
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| Abstract: | In order to
provide a reference for the design of fire prevention and rescue in high altitude
tunnel, a full scale model tunnel is established by
fire dynamics simulator(FDS), and 5 different ambient pressures are provided.
And then the influence of different ambient pressures on the maximum
temperature around tunnel crown in case of fire is studied. The study results
show that: (1) Under the same heat release rate(HRR), the maximum temperature
around tunnel crown increases with the decrease of ambient pressure. (2) The
variation of air density and entrainment strength caused by the decrease of
ambient pressure is the main factor causing the maximum temperature variation
around tunnel crown. A prediction model for the maximum temperature around
tunnel crown considering ambient pressure is proposed based on theoretical
analysis and numerical simulation results. The prediction model shows that the
maximum temperature around tunnel crown is proportional to the 2/3 power of the
dimensionless HRR considering the ambient pressure. Finally, the reliability of
the prediction model is verified by the existing model test data. |
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| Keywords: | tunnel fire maximum temperature around tunnel crown ambient pressure smoke entrainment fire dynamics simulator(FDS) |
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