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地铁是城市中的大容量快速交通工具,也是一座城市的现代化标志之一。地铁系统的完善和密集程度代表着一座城市的经济能力和现代化水平。然而,由于地铁交通客流量大,一旦发生事故,疏散困难,极易导致群死群伤的重大事故。也由于它是一个地下的密闭轨道系统,通风管道系统比较脆弱,
The metro is a large-capacity fast-moving vehicle in the city and one of the city’s modern symbols. The sophistication and density of the subway system represents the economic viability and modernization of a city. However, due to the large traffic volume of the subway traffic, in the event of an accident or evacuation, it can easily lead to major accidents involving mass extinction. Also because it is an underground closed track system, the ventilation duct system is relatively fragile,