Research And Implementation Of A Group Emergency Evacuation Model After An Earthquake Considering Multiple Factors

As one of the most frequent and most harmful extreme disasters on Earth,the earthquake has caused great harm to the safety of life and property of human beings around the world.Therefore,in the context of earthquake disasters,it is of great practical significance to carry out research on emergency evacuation of post-earthquake groups.The research results of crowd evacuation theory and the rapid development of computer simulation technology provide theoretical and technical support for the study of emergency evacuation of post-earthquake groups.Through the post-earthquake group emergency evacuation study,the evacuation behavior of the crowd can be simulated to provide scientific guidance for the affected people.After the earthquake,how to organize personnel evacuation reasonably and efficiently is an important research content of the crowd evacuation theory.Most traditional studies only consider simple group evacuation behaviors,ignoring differences in relationships and behavioral differences between individuals,which leads to differences between research theories and actual evacuations.Therefore,this thesis introduces several factors such as social relations,leaders and mental state in the study of group evacuation model,and constructs a new post-earthquake group evacuation model with improved particle swarm optimization algorithm.The main work of this thesis are summarized as follows:(1)This thesis constructs a post-earthquake emergency evacuation model considering various factors.In order to more realistically simulate the evacuation process of the crowd,this thesis considers social relations,mental state,leader leading role and other factors in the post-earthquake group evacuation simulation research,and different movement rules of individuals and groups are defined to form different types of group evacuation behaviors.(2)This thesis proposes an improved particle swarm optimization algorithm based on field of view radius and leader.The algorithm incorporates the factors of leader and visual field radius,and combines the crowd mentality to introduce the concept of local optimal location.The next position of the individual is determined by the three parts of the global optimal position,the local optimal position and the personal optimal position.(3)The simulation platform for emergency evacuation model of post-earthquake group was designed and implemented.The platform is designed and implemented on Netlogo,including initialization module,group evacuation module and evacuation solution optimization module.This thesis verifies the model and algorithm through the example of the urban block in Mianzhu City.From the verification results,the model can give the optimal number of volunteers under different population density,and can provide auxiliary decision-making for the evacuation direction of the victims.It can greatly improve the evacuation efficiency while saving social resources.