Study on Fire Model Test under Wind Flow Coupling Effect between Railway Main Tunnel and Inclined Shaft

被引：0

作者：

Li Q. ^{[1
]}

Wang M. ^{[2
,3
]}

Li Z. ^{[4
]}

Yu L. ^{[2
,3
]}

Yan T. ^{[2
,3
]}

Xie W. ^{[1
]}

机构：

[1] College of Architecture and Urban-rural Planning, Sichuan Agricultural University, Dujiangyan

[2] School of Civil Engineering, Southwest Jiaotong University, Chengdu

[3] Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu

[4] School of Civil Engineering and Architecture, Chongqing University of Science & Technology, Chongqing

来源：

Tiedao Xuebao/Journal of the China Railway Society | 2019年 / 41卷 / 10期

关键词：

Critical wind speed; Fire test; Inclined shaft; Numerical calculation; Railway tunnels; Smoke flow length; Temperature distribution;

D O I：

10.3969/j.issn.1001-8360.2019.10.014

中图分类号：

学科分类号：

摘要：

In order to study the interaction between the main tunnel and inclined shaft in a railway tunnel in fire scenarios,fire burning tests were conducted against railway tunnel fire under combined scenarios of such as different wind speeds of main tunnel and inclined shaft and fire scale. The results show that: the larger the fire scale is, the higher the maximum temperature at the dome. Compared with the fire scale of 15 MW, the maximum temperature of fire scale of 20 MW increases by 130℃. Compared with the case where the main tunnel is ventilated at 2.5 m/s, the maximum temperature of the tunnel vault is 140℃ higher than the case where the tunnel is not ventilated. In the case where the main tunnel is ventilated at 2.5 m/s, fire smoke in the main tunnel is easier to enter the inclined shaft. The greater the air velocity from the inclined shaft to the main tunnel, the lower the dome temperature in the main tunnel section with inclined shaft. When the inclined shaft air supply speed is 3 m/s, the maximum temperature of the fire source dome is reduced by 80℃ compared to the situation when the air is not supplied. The change of dome temperature in the main tunnel section without inclined shaft is insignificant. With the increase of inclined shaft wind velocity, the length of the smoke flow entering the inclined shaft is shorter. Compared with the case where the air is not supplied, the length of the fire smoke in the inclined shaft is reduced by 74 m when the air velocity of inclined shaft is 1 m/s. The critical wind velocity to ensure that no fire smoke in the main tunnel intrudes into the inclined shaft is 2 m/s. © 2019, Department of Journal of the China Railway Society. All right reserved.

引用

页码：99 / 106

页数：7

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