Study On Fire Smoke Diffusion And Safety Evacuation Simulation Of Island Subway Station

In the process of development of modern city,the world gradually formed the characteristics of the high density population,a high-density residential metropolis will bring serious traffic congestion problem,and in order to promote the availability factor of modern urban transportation system,so subway is a significant public traffic tools.Subway fire is a big threat which will affect the stable and safe operation of the subway.It is difficult for passengers to evacuate because of high density of personnel,large amount of mobility,small number of narrow entrance and exit,lack of oxygen supply,difficulty in discharging smoke and slow heat dissipation.Once the subway fire occurs,the consequences will be serious,which will not only affect the life safety of the people,but also bring terrible influence to the economic development and stability of society.So the safety of subway fire smoke diffusion and evacuation,can effectively prevent and reduce the casualties,and can reduce group die group of injury events occur,the maximum to ensure the safety of the passengers' personal safety and public economic property,it has become the research hotspot and difficulty of public security discipline at China and abroad.In this thesis,the main research methods of numerical simulation are studied in the following aspects:(1)Through preliminary investigation,summarized the theoretical basis of fire smoke simulation and personnel evacuation in subway,summarizing the related theories of fire numerical simulation,choosing to use a virtual sim as a modeling tool,FDS for fire simulation software,and Building EXODUS is used as simulation software for personnel evacuation simulation.(2)Through investigation,selected the subway standard station commonly used in subway construction as the research object.According to the actual situation of the subway station,choosed the reasonable parameters of the rational physical model,the combustion rate of the ignition source,and the type of fire studied.(3)Comparative study on platform fire and train fire,analysing platform fire cases,different location of fire spread characteristic,the smoke layer height,flue gas temperature,visibility,the qualitative analysis of characteristics of fire smoke diffusion,quantitative analysis after the fire station to arrive at the dangerous state the time required.(4)And combining with evacuation software,computing station considering characteristics under the condition of the required personnel evacuation time,evacuation time and safe evacuation time available,the subway fire condition to identify whether for safe evacuation,and combining the result puts forward reasonable suggestions for prevention and control of fire and evacuation.(5)Through the subway platform fire and train fire numerical simulation research of flue gas flow characteristics data and combined with the fire evacuation simulation research personnel safety evacuation characteristics data can be for subway fire emergency plan preparation and data support for the design of evacuation system.