Optimization And Simulation Of Urban Traffic Evacuation And Rescue In Post Earthquake Secondary Disasters

Earthquake and secondary disasters will cause different degrees of damage to the road traffic system.After the disaster,the government management department needs to take efficient traffic emergency measures to evacuate the people in the disaster area to a safe area quickly,and guarantee the rescue vehicles to reach the disaster area quickly to carry out rescue work.Sudden disasters will stimulate a large number of traffic demand in a short period of time,and take reasonable emergency measures to adjust and control the regional road network,which can effectively guarantee the safety of people's lives and property.This paper studies the disaster characteristics of earthquake and gas leakage accident,aiming to formulate emergency traffic organization strategy under the condition of earthquake secondary disaster,and the research is mainly carried out from the following three aspects:Analysis and Research on the influence of earthquake and secondary disasters.In order to measure the earthquake damage to urban road traffic system,this paper analyzes the damage characteristics of urban roads in the event of earthquakes,and then determines the reduction coefficient of road capacity in different levels of earthquakes.Gas leakage accident is one of the secondary disasters.High concentration of toxic gas will reduce the visibility of the nearby area,and then affect the road traffic capacity.This paper analyzes the relationship between the gas concentration and the visibility,uses the Gaussian gas diffusion model to determine the gas concentration of the surrounding area of the toxic gas leakage accident,and then determines the corresponding visibility,and finally determines the road traffic capacity reduction coefficient of different visibility areas.Traffic emergency organization research.This paper proposes an evacuation organization strategy based on the reverse link and the elimination of intersection conflict.Firstly,the operation characteristics of the evacuation traffic flow in the background of free traffic flow scenario are analyzed.Then,based on the cost flow model,an algorithm for solving the reverse link is designed,which can consider the effectiveness of the rescue path and deal with the conflict at the intersection.Then,an example is given to discuss the social fairness of evacuation and the implementation effect of reverse link.Finally,the validity of the algorithm and model is verified by Q-paramics simulation software.Case analysis.This paper selects part of the regional road network in Zhongguancun for example analysis,and finds that the conclusions of the case analysis can be confirmed here,such as the phenomenon that the total evacuation time of non high-risk residential areas increases after the implementation of the reverse link measures.In addition,this paper analyzes the implementation effect of the reverse link measures in different situations,and obtains a series of conclusions,such as when the contradiction between the supply and demand of the road network is significant,the implementation of the reverse link measures can effectively improve the evacuation efficiency;the implementation effect of the reverse link measures in disaster conditions is related to the state of the road network itself,but the correlation with the evacuation demand is relatively low.