Simulation Of Crowd Evacuation And Fall Behavior In Primary And Secondary School Teaching Buildings Based On Social Force Model

In the primary and secondary school campus,the crowd is mainly teenagers,the crowd density is high,easy to happen stampede accidents.Young people’s selfprotection ability is weak,especially when encountering unexpected events,if they cannot be safely and timely guided evacuation,they are easy to panic,disorderly evacuation behavior and even fall,increasing the probability of accidents and causing serious losses.As the main space for primary and middle school students to study in school,the teaching building is a frequent place where accidents happen.In order to avoid accidents,field exercises used in real life are time-consuming and labor-intensive and have security risks,while computer simulation technology can show the crowd evacuation process more intuitively and safely.Therefore,how to accurately simulate the evacuation behavior of primary and secondary school students,formulate corresponding protective measures and reduce the stampede probability is an urgent problem to be solved.In this paper,through statistical data of stampede accidents in primary and secondary schools,the causes of stampede accidents and crowd behaviors are analyzed,and the social force model is improved in the aspects of emotional diffusion and individual stress.unity3 d was used to simulate the crowd evacuation and fall behavior of primary and secondary school teaching buildings based on social force model.The work of this paper is as follows:1.Aiming at the problem of crowd evacuation caused by panic emotion in emergencies,a crowd evacuation model considering the spread of panic emotion is proposed.First of all,the panic degree increase caused by crowd crowding factors,risk source factors and panic transmission factors is modeled to obtain the panic degree increase model.Then,considering the exit factor,the panic attenuation model is established.Finally,an improved social force model considering the diffusion of panic was established to obtain the force model in the process of pedestrian evacuation.2.When the crowd is evacuated,it is easy for individuals to fall down in the stairwell of primary and secondary school teaching buildings,leading to trampling.Aiming at this phenomenon,an individual fall model is proposed.Firstly,based on the social force model,the generation conditions and transmission rules of the crowding force are given.Then,according to the panic diffusion model,the emotion is quantified and coupled with the stress of pedestrians to get the individual stress under the panic state.Finally,the decision rules of individual instability and fall are given,and an individual fall model considering panic diffusion and crowding force is established.3.Taking the teaching building of primary and secondary schools as the research scene,a complete micro-simulation model of the teaching building of primary and secondary schools was established,and the evacuation behavior and falling behavior of primary and secondary school students were simulated on the unity3 d simulation platform,and the control countermeasures to prevent individual falls were proposed based on the simulation results.The simulation results show that the crowd evacuation model and the individual fall model considering the panic diffusion and crowding force established in this paper can better reflect the real situation of crowd evacuation in primary and secondary school teaching buildings,and provide an effective reference for understanding the characteristics of evacuation behavior of primary and secondary school students.