V形坡度对地铁隧道火灾临界风速的影响  

Influence of V-shaped Slope on Critical Velocity in Subway Tunnel Fires

作　　者：王海涛[1] 高欢欢 李彬[1] WANG Hai-tao;GAO Huan-huan;LI Bin(College of Civil Engineering,Henan University of Technology,Zhengzhou 450001,China)

机构地区：[1]河南工业大学土木工程学院,郑州450001

出　　处：《科学技术与工程》2023年第11期4858-4864,共7页Science Technology and Engineering

基　　金：河南省科技攻关项目(192102310229);河南工业大学青年骨干教师基金(21420069)。

摘　　要：由于穿越隧道、燃气管线和地质条件的工程需要,部分地铁隧道是V形坡度隧道。V形坡度隧道的烟囱效应会增加火灾烟气控制的复杂性和困难。采用理论分析和数值模拟相结合的方法研究V形坡度隧道夹角和高差对火灾临界风速和烟气返流长度的影响。研究结果表明,坡度隧道的隧道夹角对地铁隧道火灾临界风速有较大影响,隧道火灾临界风速随着上坡隧道夹角增大而变小,隧道火灾临界风速随着下坡隧道夹角增大而变大;V形坡度隧道自然通风竞争效应会对地铁隧道火灾临界风速有较大影响,隧道火灾临界风速随着上坡隧道高差的增大而变小,隧道火灾临界风速随着上坡隧道夹角的增大而变小。该文的研究结果可以为V形坡度隧道通风防排烟系统设计过程中的火灾临界风速取值提供理论参考和依据。Some subway tunnels are V-shaped slope tunnels due to the need of crossing tunnel,pipeline,geological conditions and tunnel drainage.Smoke competition in V-shaped slope tunnel will increase the complexity and difficulty of smoke control in subway tunnel fires.The influences of tunnel slope,tunnel slope and height difference of V-shaped slope tunnel on critical velocity and smoke back-layering length in subway tunnel fires are investigated by using the theoretical analysis method and numerical simulation method.Results show that tunnel slope and V-shaped slope has significant effects on critical velocity and smoke back-layering length in subway tunnel fires.The critical velocity decrease with the increasing of the tunnel slope for the uphill tunnels.The critical velocity increase with the increasing of the tunnel slope for the downhill tunnels.The critical velocity decrease with the increasing of the tunnel slope for the uphill tunnels of V-shaped slope tunnels.The critical velocity decrease with the increasing of the height difference for the downhill tunnels of V-shaped slope tunnels.Research results can provide the theoretical basis and technical support for determining the critical velocity in the ventilation design and smoke control system design for V-shaped slope subway tunnels.

关 键 词：地铁隧道 坡度 临界风速 火灾 

分 类 号：U458.1[建筑科学—桥梁与隧道工程]