地铁长大过海区间隧道通风排烟方案

Ventilation and Smoke Extraction in Long Subsea Subway Tunnel

针对地铁长大过海区间隧道通风排烟问题,结合青岛地铁1号线瓦贵区间工程,采用理论及对比分析、数值解算等方法,分析过海区间隧道区间风井设置、火灾工况气流组织等问题。介绍青岛地铁1号线瓦贵区间概况,然后提出区间风井设置的要点,参考国内相关城市过江工程实例,采用土建排烟风道,以保证灾害工况下两车追踪人员的疏散安全。阐述陆域段防排烟和海域段防排烟方案,对于陆域段,排烟方案可以按照常规地铁区间进行设置;对于海域段,需根据区间长度,采用全吊顶或者局部吊顶排烟方案。通过研究区间火灾安全目标,设定热释放功率为10 MW,隧道临界风速为2.1 m/s,重点排烟量为80 m3/s,并绘制通风网络解算结果图,解算结果表明各区间风井的防排烟系统均满足规范要求。

Some technical problems including ventilation and smoke exhaust, fire escape and evacuation, etc. , have occurred in long subsea tunnels with the rapid development of tunneling technology which allows to construct longer and more complicated subsea tunnels. Shaft and smoke extraction in the subsea section of the tunnel is analyzed by citing Wagui tunnel in Line 1 in Qinglao as a case. Theoretical and contrastive analysis is made and ventilation network calculation is done. The reasonable and feasible ventilation and smoke extraction that can ensure safe operation of the tunnel is put forward. The fire safety target is stud- ied and it is found that the heat release power is set to 10 MW, the tunnel critical wind velocity is 2.1 m/s, the smoke emission is 80 m3/s, and the restllts of the ventilation network are plotted. The solution shows that every smoke control system of the ventilation can meet the requirements of the code.