Research on the Fire Spread Law of Subway Connection Lines

伴随城市地铁网络的拓展，跨线运营安全成为重要课题。研究选取某站地铁1、3号线联络线为研究对象，针对联络线火灾控制与人员疏散难题，设置两种火灾工况，模拟联络线与1号线正线分岔点处列车火灾场景下不同排烟方式对能见度、温度分布及CO浓度的影响。工况2 (往1号线排烟)相较于工况1 (往3号线排烟)各节车厢及车厢附近区域达到危险状态的时间延迟，更有利于人员疏散。该研究成果为优化地铁联络线火灾防控措施及后续的跨线运行提供了理论支撑。With the expansion of urban subway networks, the safety of cross-line operations has become an important issue. This study selects the connecting line between Metro Line 1 and Line 3 at a certain station as the research object. Aiming at the challenges of fire control and personnel evacuation in the connecting line, two fire scenarios are set up to simulate the effects of different smoke exhaust modes on visibility, temperature distribution, and CO concentration in the fire scene of a train at the branching point between the connecting line and the main line of Line 1. Compared with Scenario 1 (smoke exhaust towards Line 3), Scenario 2 (smoke exhaust towards Line 1) delays the time for each carriage and the area near the carriage to reach a dangerous state, which is more conducive to personnel evacuation. The research results provide a theoretical support for optimizing fire prevention and control measures for subway connecting lines and subsequent cross-line operations.