摘要
竖井间距会改变竖井内外压差,当竖井内外压差为0时,隧道火灾烟气将无法排出,此时竖井对应位置为竖井临界间距。由竖井内外口压差理论分析,给出竖井临界间距理论模型,再采用FDS模拟进行仿真验证。结果表明:设置竖井可明显降低隧道温度,竖井间距为临界间距时,温度下降幅度接近150℃,人员疏散路径温度低于60℃,竖井排烟效率在55%~80%,可有效进行竖井排烟;当竖井间距大于竖井临界间距时,隧道内烟气压强小于竖井出口处风压,竖井排烟效率低于50%。
The spacing between vertical shafts can change the pressure difference inside and outside the shaft.When the pres⁃sure difference inside and outside the shaft is zero,tunnel fire smoke cannot be discharged,and the corresponding position of the shaft is the critical spacing between vertical shafts.Based on the theoretical analysis of the pressure difference between the in⁃ner and outer openings of the vertical shaft,a theoretical model of the critical spacing of the vertical shaft is provided,and then FDS simulation is used for simulation verification.The results show that setting vertical shafts can significantly reduce tunnel temperature.When the distance between vertical shafts is a critical distance,the temperature drop is close to 150℃,and the tempera⁃ture of personnel evacuation paths is below 60℃.The smoke ex⁃haust efficiency of vertical shafts is between 55%and 80%,which can effectively carry out smoke exhaust in vertical shafts;When the distance between vertical shafts exceeds the critical distance,the smoke pressure inside the tunnel is less than the wind pressure at the outlet of the shaft,and the smoke exhaust effi⁃ciency of the shaft is less than 50%.
作者
王洁
王璐
姜学鹏
Wang Jie;Wang Lu;Jiang Xuepeng(School of Resources and Environmental Engineering,Wuhan University of Science and Technology,Hubei Wuhan 430081,China;Research Center of Fire Safety,Wuhan University of Science and Technology,Hubei Wuhan 430081,China;Institute of Safety and Emergency,Wuhan University of Science and Technology,Hubei Wuhan 430081,China)
出处
《消防科学与技术》
CAS
北大核心
2024年第1期65-69,共5页
Fire Science and Technology
基金
国家自然科学基金项目(51874213)
湖北省重点研发计划项目(2020BCB072)。
关键词
城市浅埋隧道
竖井排烟
竖井临界间距模型
自然排烟
urban shallow buried tunnels
vertical shaft smoke ex⁃haust
critical spacing model for vertical shafts
natural smoke ex⁃haust
