Numerical Simulation Study On Personnel Evacuation In Huainan Longhu Underground Commercial Street

With the continuous development of urbanization,the traffic of city ground is becoming more and more congestion,so all kinds of underground structures appear at the moment.But there are many different kinds of defects at underground mall like so many management and inflammable goods,complicated building layout and structure,indetectable exit signs,high concentration of flue gas,high temperature,low visibility,and hard fighting and rescue work.Thus,the underground malls have bigger risk.What's more,The commercial streets are always in the city's downtown area,and the traffic was large and concentrated.So in the event of fire,the consequences are often the group death and group injuries.Therefore,the research of the fire in the underground mall and personnel evacuation is necessary.At first,this paper analyzed the potential safety hazard and the cause of the fire at Huainan Longhu underground commercial street;summed up the fire characteristics of the underground mall;through field investigation,drew the store distribution diagram of proportion;determined the six points;through analysis,got the fire dangerous state judgment basis;carried out field investigation at Longhu underground commercial street,got the different period and the total number of visitors at each measuring point;set up the fire model and personnel evacuation simulation model at the commercial street;merged?counted?organized and analysed the results of simulation;put forward suggestions for evacuation.Research results show that:the first,without spray,the times of arrival in critical risk of smoke layer height,smoke temperature,concentration of CO are 200s,120s and 150s(RSET is 120s);with spray,the times become 200s,+?,270s(RSET is 200s).ASET from evacuation simulation is 200s.Therefore,the spray device can meet the demand of safety evacuation of personnel.The second,especially at the early stages of fire development,the simulation results show that the speed of evacuation is the spread of flue gas.Therefore,people should escape back toward the direction of the fire,and choose the exit far away form fire.That can greatly improve the probability of successful escape.The third,the fire sprinkler system is very important.It can not only significantly reduce the temperature at the fire,but also ensure the safety of personnel evacuation far from the fire.It can strive for precious time for the personnel evacuation and rescue work.The content and result of this paper can be promoted to other similar underground structures,it can provide reference basis for fire risk assessment and personnel evacuation of underground structures,it has a certain practical significance and reference value.