期刊论文

中文

安全与环境学报

1009-6094

2013

13

2

179-182

10.3969/j.issn.1009-6094.2013.02.038

湖南省科技计划项目（2012GK3169） 灭火救援技术公安部重点实验室开放课题（KF2011003） 中南大学中央高校基本科研业务费专项资金项目（2011QNZT109）

本校为其他机构

盾构隧道常利用富余空间设置独立的安全通道以利于人员逃生。为防止烟气侵入安全通道,需对安全通道进行送风,使开启疏散口处保持一定的风速或压差。根据盾构隧道安全通道结构形式及通道内空气流动的物理过程,基于4个假设条件,将其简化为一个带有等面积疏散口的等断面近似均匀送风管道。利用相关流体力学知识对其送风防烟过程进行分析,考虑疏散门开启时门洞断面风速最小应为0.7 m/s,建立满足安全通道正压防烟要求的风机流量和压力计算公式。利用该计算公式对实际工程设计进行估算,明确了安全通道送风风机的性能参数。

The paper is engaged in a study of the principle of positive pressure air supply of safety channel in the so-called shield tunnels, which refers to a special surplus space under the driveway in the tunnel designated for man to escape in a safe way. As is known, once a fire takes place in the driveway, the ventilation air should be sent into the safety channel to keep a certain moving speed or pressure in the evacuation outlet so as to ensure the safety channel from the smoke invasion. The minimum wind speed in the evacuation outlet is 0.7 m/s. ...