复杂地下空间交通体系连接匝道烟气控制方案研究

复杂地下空间交通体系作为新型地下交通形式，车流量大且存在多个分合流点，气流组织复杂，防灾排烟难度极大。以杭州某复杂地下空间交通体系连接匝道为研究背景，提出匝道通风排烟设计方法，再选取其中二合一式连接匝道结构，采用FLUENT模拟其两种防灾排烟方案的有效性。模拟结果表明：两个连接匝道末端单独设置排烟口的设计方案可有效保证火源下游车辆和火源上游人员的逃生安全；根据分合流流速分配理论模型，在合流处只设置一个排烟口且排烟量提高40 m³/s时，也可达到同样的防灾排烟效果，从土建成本考虑，推荐此方案，为同类型隧道结构提供借鉴。

Research on flue gas control scheme of connecting ramp in complex underground space traffic system

The complex underground space traffic system, as a new type of underground traffic, has a large traffic flow, and there are multiple sub-merging points, complex airflow organization, and complicated disaster prevention and smoke exhaust. By taking the connecting ramp of a complex underground space traffic system in Hangzhou as the research background, a design method for ventilation and smoke exhaust on the ramp is proposed. The two-in-one connecting ramp structure is selected, and FLUENT is used to simulate the effectiveness of its two disaster prevention and smoke exhausting schemes. The simulation results show that the design scheme of separately setting smoke exhaust ports at the ends of the two connecting ramps can effectively ensure the escape safety of vehicles downstream of the fire source and personnel upstream of the fire source. When the smoke exhaust volume is increased by 40 m3/s, the same effect of disaster prevention and smoke exhaust can also be achieved. Considering the cost of civil construction, this scheme is optimized compared with the former, providing a reference for the same type of tunnel structure.