明挖城市地下道路外部竖向疏散通道对隧道内人员疏散的影响分析

本文基于某实际明挖隧道的竖向逃生通道结构设计,对隧道外部结构的前室门宽度、楼梯宽度、楼梯间休息平台深度三个因素各自对隧道内部疏散过程的影响,利用Pathfinder工具进行模拟研究。结果表明:考虑隧道外部竖向疏散通道对隧道内部人员疏散时间的影响约为忽略竖向通道的2.43倍,尤其逃生人数众多时影响不可忽略;其中逃生楼梯宽度影响最大,宽度增加至1.6m,隧道内疏散时间可降低高达47%;前室门宽度、休息平台深度减小至1m均会在一定程度上产生影响。本文研究预期为城市地下隧道的疏散模拟和隧道外部逃生结构的设计优化提供指导。

Analysis on the Influence of External Vertical Evacuation Passage on Evacuation in Tunnel

In this paper,based on the structural design of a vertical escape passage in an open trencht tun-nel,the influence of three factors of the outer structure of the tunnel were analyzed with Pathfinder:the width of the front room door,the width of the staircase and the depth of the rest platfomm on the intemal.The results showed that the structure of the vertical evacuation channel has a much higher effect on the evacuation time(2.43 times)than that without the vertical ev acuation channel,especially when there are more pesonnel in the.tunnel.The width of the escape stairs in the vertical evacuation passage is the greatest infuence factor.When the width is increased to 1.6m,the evacuation time in the tunnel could be reduced by 47%.The width of the front room door and the depth of the resting platfom reduced to 1m would have an impact to a certain ex-tent.This study was expected to provide guidance for evacuation simulation of underground tunnels and design optimization of escape structures in cities.