基于网络图论的公路隧道通风排烟系统设计

摘要

The West Highway fragrant small mountain tunnel as an example,according to the de-sign principles of network graph theory,the design of ventilation system of highway tunnel;ventilation re-sistance and wind pressure on the tunnel internal calculation and resistance calculation of the fire smoke flow were deduced and obtained the formula by FDS;the fire dynamics simulation analysis of exhaust ven-tilation system network simulation software the different ventilation network,the maximum extraction rate and the optimal ventilation network design,for the small mountain tunnel smoke,when the fire in the cen-ter of the tunnel,the maximum extraction rate of the system is about 160m fand /s.The simulation results show that if the fire source is far away from the entrance location in the depths of the tunnel,two-way smoke exhaust mode is adopted.If the fire source is close to the tunnel entrance,the one-way ventilation mode is adopted.%以西香段高速公路小高山隧道为例，根据网络图论设计原则，设计了公路隧道通风排烟系统；对隧道内部的通风阻力、风机风压计算以及火灾烟流阻力计算进行了推导，得出了其计算公式；采用 FDS 火灾动力学模拟软件进行通风排烟网络系统模拟分析，得出了不同通风排烟网络下的最大排烟速率以及最优排烟网络设计，针对小高山隧道排烟系统，当起火源在隧道中央位置时，系统的最大排烟速率约为160 m3／s。模拟结果表明若起火源位置在隧道深处远离出入口位置时，宜采取双向排烟模式，若起火源靠近隧道出入口，宜采取单向排烟模式。