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地铁事故中以火灾事故危害最大。地铁作为一个封闭的地下空间，它与外界相通的仅有车站出入口、通风亭与隧道口。在发生火灾时，由于通风不足、燃烧不充分，CO、CO2及其他有毒气体浓度增长迅速，同时排热排烟条件差、烟量较大，热量聚集快，内部温度上升快，人员的疏散方向与烟气扩散方向都是出入口，所以地铁火灾极易造成群死群伤事故。因而事先了解地铁火灾特点，掌握火灾发展状况将给地铁消防系统的设计提供重要依据。

Answer 1

地铁事故中以火灾事故危害最大。地铁作为一个封闭的地下空间，它与外界相通的仅有车站出入口、通风亭与隧道口。
Fire is the most vital one among all subway accdients.As a sealed space underground,subways have only entrance&exit, ventilating stands and channel entrances to connect the outside.

在发生火灾时，由于通风不足、燃烧不充分，CO、CO2及其他有毒气体浓度增长迅速，同时排热排烟条件差、烟量较大，热量聚集快，内部温度上升快，人员的疏散方向与烟气扩散方向都是出入口，所以地铁火灾极易造成群死群伤事故。When a fire is started,density of CO,CO2 and other poisoning gases will grow rapidly due to poor ventilation and insufficient combustion,in the mean time,owning to poor condition for releasing heat and smoke,there will be dense smoke and heat will accumulate fastly,the internal temperature will increase at high speed,and dispersal of the smoke and gases has the same direction for people evacuation namely the entrance,hence fire in subways account mainly for accidents of huge casualty easily.

因而事先了解地铁火灾特点，掌握火灾发展状况将给地铁消防系统的设计提供重要依据。

So have good matery over its features in advance and status of the fire will provide essential evidence for design of the fire-fighting system.

Answer 2

Subway accident to a fire accident caused the most serious.Subway as a closed space, and it is linked to the outside world only station entrances, ventilation booths and the entrance of the tunnel. In case of fire, due to inadequate ventilation, inadequate combustion, CO, CO2 and other toxic gas concentrations increased rapidly, Moreover, due to poor conditions of exhaust heat, a larger amount of smoke, heat gathered quickly, the internal temperature rises fast, Smoke spread direction and the direction of the evacuation exits are, very vulnerable to fire, killing and injuring many subway accident. Consequently, to understand the subway fire characteristics prior to the fire master development,and that will provide an important basis for the design of metro fire system.

Answer 3

Of all these subway accidents, fire accident may bring the most serious damage.Subway is a closed space, and it is linked to the outside world only by station entrances, ventilation booths and the entrance of the tunnel. In case of fire, due to inadequate ventilation, inadequate combustion, CO, CO2 and other toxic gas concentrations increased rapidly. Moreover, due to poor conditions of exhausting, a larger amount of smoke, heat gathere quickly, so the internal temperature will rise fast. Smoke spread through the same direction as the way people dispose, thus, subway accident will inevitably cause severe killing and injuring. Consequently, to understand the subway fire characteristics prior to the fire, and master its development will provide an important basis for the design of metro fire system.本回答被提问者采纳

Answer 4

BE endanger with a fire trouble in the subway trouble biggest.The subway conduct and actions is an underground space of sealing off, it and the external world mutually has the station exit and entrance,well ventilated station and the tunnel orifice only.While take place a fire, because of the ventilation shortage,combustion insufficiency, the CO,CO2 and the other poisonous air concentration growth are quick, lining up the thermal row smoke condition in the meantime bad,the smoke quantity compare greatly, the calories bunching quick, internal temperature ascension quick, the personnel's evacuation direction and smoke's annoying diffusion all of directions is exit and entrances, so the subway a fire results in easiest cluster dead cluster harm trouble.As a result understand the subway a fire characteristics in advance, control a fire development condition will provide the importance basis for the design of the subway fire fight system.