单/双线拱形、类矩形隧道火灾超380 ℃耐火极限范围研究

消防科学与技术 ›› 2023, Vol. 42 ›› Issue (2): 159-163.

单/双线拱形、类矩形隧道火灾超380 ℃耐火极限范围研究

张迪1，陈扬勋1，徐巍1，姜学鹏2

（1.中铁第四勘察设计院集团有限公司，湖北武汉 430063；2.武汉科技大学消防安全技术研究所，湖北武汉 430081）

出版日期:2023-02-15 发布日期:2023-02-17
作者简介:作者简介：张迪（1972- ），男，湖北天门人，中铁第四勘察设计院集团有限公司教授级高级工程师，学士，主要从事隧道及地下工程勘察设计与研究，湖北省武汉市武昌杨园和平大道745号，430063。
基金资助:
国家自然科学基金项目（51874213）；湖北省重点研发计划项目（2020BCB072）

Research on the fire resistance rating range of single/double-line arched-quasi-rectangular tunnels exceeding 380 ℃

Zhang Di1， Chen Yangxun1， Xu Wei1， Jiang Xuepeng2

(1. China Railway Fourth Survey and Design Institute Group Co., Ltd., Hubei Wuhan 430063, China; 2. Fire Safety Technology Institute, Wuhan University of Science and Technology, Hubei Wuhan 430081, China)

Online:2023-02-15 Published:2023-02-17

摘要/Abstract

摘要： 为选取单/双线拱形、椭圆类矩形3种代表性截面隧道，采用FDS数值模拟软件研究不同风速下隧道截面差异对隧道壁面超耐火极限范围影响。结果表明：环境风速下，各截面隧道混凝土壁面温度均超380 ℃耐火极限，单洞双线隧道混凝土壁面最高温度与超耐火极限范围均近似为单洞单线、椭圆类矩形隧道的1/2；机械通风可有效减小隧道混凝土壁面温度，单洞双线隧道混凝土壁面温度小于耐火极限温度380 ℃，单线单洞、椭圆类矩形隧道混凝土壁面温度超耐火极限长度范围分别减小至环境风速下1/3、2/5，椭圆类矩形隧道在机械通风下火灾发展趋势增强。

Abstract: Three representative cross-section tunnels, single/double-line arch, and ellipse-like rectangle, were selected, and the FDS numerical simulation software was used to study the effect of tunnel cross-section differences on the ultra-fire resistance rating range of the tunnel wall under different wind speeds. The results show that: under the ambient wind speed, the temperature of the concrete wall of each section of the tunnel exceeds the fire resistance rating of 380 ℃. The maximum temperature of the concrete wall of the single-hole double-track tunnel and the range of the ultra-fire resistance rating are approximately 1/2 of those of the single-hole single-track tunnel and the elliptical rectangular tunnel. Mechanical ventilation can effectively reduce the temperature of the concrete wall of the tunnel, and the range of the concrete wall temperature exceeding the fire resistance rating of single-line single-hole and elliptical double-line tunnels is reduced to 1/3 and 2/5 of the ambient wind speed, respectively, and the fire development trend of elliptical rectangular tunnels is enhanced under mechanical ventilation.

Key words: tunnel cross-section, ultra fire resistance rating range, surrounding ventilation, mechanical ventilation, numerical simulation

张迪, 陈扬勋, 徐巍, 姜学鹏. 单/双线拱形、类矩形隧道火灾超380 ℃耐火极限范围研究[J]. 消防科学与技术, 2023, 42(2): 159-163.

Zhang Di, Chen Yangxun, Xu Wei, Jiang Xuepeng. Research on the fire resistance rating range of single/double-line arched-quasi-rectangular tunnels exceeding 380 ℃[J]. Fire Science and Technology, 2023, 42(2): 159-163.