Abstract:  Fire safety and people evacuation in confined and narrow spaces have always been the key areas of fire protection research. Due to its large flow of people, closed space, and difficult fire evacuation, the subway needs special attention. The ventilation mode and fire linkage mode of domestic subway stations were investigated, and the principle of fire ventilation linkage mode in subway tunnel was studied. Based on the design of evacuation scheme of section fire under two modes of normal linkage and fault linkage of station equipment in case of section fire, the advantages and disadvantages of linkage mode of four stations and three sections, two stations and one section under the condition of section fire were analyzed systematically from tunnel smoke exhaust wind speed, equipment linkage and operation quantity, post disaster equipment recovery and personnel relief workload, response time and reliability of overall operation of fire linkage system, etc. Finally, the conclusion was drawn based on the actual measurement data of the two ventilation linkage schemes in Qingdao metro section fire mode. And this study can provide a basis for the design of fire ventilation linkage mode of subway tunnel.

Key words:  tunnel section, fire linkage, ventilation system, four stations and three sections, two stations and one section