基于网络图论的公路隧道通风排烟系统设计

Design of Ventilation and Smoke Exhaust System of Highway Tunnel Based on Network Graph Theory

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 m^3/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。

The West Highway fragrant small mountain tunnel as an example,according to the design 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 ventilation 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 center 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.