Study Of Numerical Simulaotion Fire And Evacuation Of Experiment Building Of Uderground Mall

With economic growing steadily,the urban population has expanded,underground space effectively,the development of underground construction will become the new direction of city construction and development,such us subway,tunnel,underground garage,underground shopping malls and other diversified the establishment of underground engineering.The various types of security hidden trouble will ensue at the same time with the popularity of the underground mall.The worst damage of the life and property was fire.Underground fire is a common form,the construction form of digging,only exhaust fume or heat disipattion by only smoke vent and lighting-atrium.No matter the number of casualties or the difficulty of rescuing all beyond the above-ground buildings.This paper focuses on fire smoke flow and evacuation study of underground mall,on the basis of the theory of fire dynamics,using computer simulation and simulate the dynamic process of the development of fire and emergency evacuation of people in a fire accident scenarios.Using fire simulation software Pyrosim obverse flue gas flowing law form under different fire source position,temperature,visibility,and find a safety critical time as a reference point of fire safety evacuation.Once again with the help of Pathfinder safety evacuation software,doing graphic virtual exercise aim at individual movement of different colony.Propose targeted fire safety measures,such as the division of fire zone,smoke control measures,safety evacuation route,etc.Finally do the uncertainty analysis,which analysis uncertain factors,and find a solution.Results show that with the help of Pyrosim and Pathfinder for scenario simulation,largely in line with the basic motion law of the flue gas diffusion mechanism,meanwhile provide significant help for the research of underground commercial street safety evacuation.From Pyrosim dynamic simulation and providing the data know that the flue gas is the most lethal factors,the best thing to do is smoke ejecting and protecting for evacuation passageway,make it in a positive pressure area,reduce the flue gas of the evacuation process.Dense of underground commercial street relatively crowd,escaping in the fire under the correct route should overcome the congestion problem,then to consider expanding the size of the exit,increasing the number of evacuation stairs,and to do a good job of smoke ejecting and protecting in stair.Through simulation we find that fire occur in B1 more dangerous than L2.Underground commercial street of smoke equipment,alarm equipment,automatic sprinkler system,smoke exhaust system are important to play effective role in the fire,road line form redundant safety systems.And these are implemented in daily fire control work,do the training for staff and management of underground mall accordingly.