Application Research On Ventilation Network Technology Of Disaster Rescue In Extra-Long Railway Tunnels

The railway industry has been in a rapid development period in recent years,especially that China Railway High-speed will provide a powerful support of "One Belt and One Road" construction in China.As an important part of the railway construction,railway tunnel will bring in more energy. The disaster rescue in tunnels has been got more and more attention as the railway tunnels will be buit more longer and in more difficult ways.In this paper,3 tunnels under construction in Chenglan and Hukun railway lines have been researched to study the ventilation network technology of disaster rescue in the extra-long railway tunnels.Through doing numerical simulation of ventilation network to these tunnels,the tunnl jet fan allocation plan in several working condition and the overall tunnl jet fan allocation plan will be calculated and given.Several common kinds of ventilation network have been simplified, then simplification theory and corresponding instances have been put forward in this paper.By doing numerical simulation of ventilation network and ventilation network simplification research, some work have been done:(1) Disaster relief technology has been researched in the extra-long railway double tunnels that have a rescue station. Through doing numerical simulation, we can see that fire smoke was mainly discharged in the air through the smoke shaft, and the distance is very short,so it’s advantageous to the activity of disaster rescue.(2) Disaster relief technology has been researched in the extra-long railway tunnels that have double lines and rescue parallels adits in one tunnel. Through doing numerical simulation, we can see that the relative position relations of supply-air adit and rescue parallel adit have great influences on the air distribution of the cross aisle.(3) Disaster relief technology has been researched in the extra-long railway double tunnels with no rescue stations. Through doing numerical simulation, different air distribution strategy shoud be executed when fire occur in different parts of the train.(4)Several common kinds of ventilation network simplification calculation methods have been put forward.By comparing the different results between the simplification calculation and ventilation network,the reliability of simplification calculation has been proved.