无纵向风下环境压强对拱顶最高温度影响数值研究

陶亮亮; 张逸敏; 刘振撼; 付孝康; 周小涵; 曾艳华

doi:10.3973/j.issn.2096-4498.2020.06.007

隧道建设 >

2020 , Vol. 40 >Issue 6: 827 - 832

DOI: https://doi.org/10.3973/j.issn.2096-4498.2020.06.007

研究与探索

无纵向风下环境压强对拱顶最高温度影响数值研究

陶亮亮 ,
张逸敏 ,
刘振撼 ,
付孝康 ,
周小涵 ,
曾艳华

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（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)

陶亮亮(1995—),男,四川广安人,西南交通大学桥梁与隧道工程专业在读硕士，研究方向为隧道通风与防灾。E-mail: taolliang@126.com。*通信作者：曾艳华, E-mail: zengyhua@163.com。

网络出版日期: 2020-06-29

基金资助

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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Numerical Study on Influence of Ambient Pressure on Maximum Temperature of Tunnel Crown without Consideration of Longitudinal Velocity

TAO Liangliang ,
ZHANG Yimin ,
LIU Zhenhan ,
FU Xiaokang ,
ZHOU Xiaohan ,
ZENG Yanhua

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(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)

Online published: 2020-06-29

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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。

关键词： 隧道火灾; 拱顶最高温度; 环境压强; 烟气卷吸; 火灾动态模拟软件(FDS)

本文引用格式

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 . DOI: 10.3973/j.issn.2096-4498.2020.06.007

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.

Key words： tunnel fire; maximum temperature around tunnel crown; ambient pressure; smoke entrainment; fire dynamics simulator(FDS)

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