公路盾构隧道纵向疏散口间距设计

Design of Longitudinal Evacuation Exits Space for Shield Tunnel

以武汉三阳路过江隧道为研究对象,利用Pathfinder数值模拟的方法,模拟盾构段交通拥堵情况下,纵向疏散口间距分别为80、100、120 m时,人员的安全疏散状况;并采用公式法计算三种不同疏散口间距时的疏散时间,将计算得全体疏散所需时间与计算机模拟时间比较。结果表明:三种不同纵向疏散口间距下的疏散时间分别为575、672、758 s,均满足安全疏散要求;公式求得的疏散所需时间与计算机模拟结果一致,且对于疏散口间距较小的情形公式计算得到的结果更准确;根据计算与模拟结果,提出盾构段纵向疏散口间距取100 m建议。

The purpose of this study is to find the best space between of evacuation exits in the highway shield tunnel. In this paper, a simulation study has been conducted for Wuhan Sanyangroad shield tunnel with Pathfinder. The people safety evacuation status was simulated at three different spaces of evacuation exits as 80 m, 100 m, 120 m under the condition of traffic jam in shield tunnel. Besides, the formula methods were also used to calculate the evacuation time in the three different spaces. Then the calculated results and the simulation results were compared and analyzed. The results show the evacuation time of three different conditions are 575 s, 672 s and 758 s, and which all meet the requirement of safety evacuation. The results also indicate the calculated results and the simulation ones are well consistent. What＇ s more, the evacuation time calculated by formula is more accurate for smaller evacuation exits spacing. Depending on the results both calculation and simulation, 100 m is the most appropriate evacuation space for suggestion.