| Emergency rescue is conducive to minimize the losses caused by the earthquake,and the urban road network provides the function of transporting rescue materials,rescue workers and other resources to reach the disaster-stricken points in the emergency rescue after earthquake.The survival rate of the buried victims rescued by the "golden 72 hours" emergency rescue after earthquake is the highest,and the strong disaster resilience of urban road network at this stage is very important to save the lives of the victims.However,the previous researches lack the analysis from the perspective of emergency rescue.The insufficient resilience resilience of urban road network will greatly delay the postearthquake emergency rescue and lead to the expansion of disaster losses.This paper analyzes the disaster resilience capacities of urban road network during "golden 72 hours" after earthquake,propose the approach to measure and optimize the disaster resilience of urban road network,and verifies the validity of the approach thourgh empirical study on the existing urban road network.The main research contents of this paper:To interpret the disaster resilience capacities of urban road network during "golden72 hours" after earthquake.This paper dissects the characteristics of functional and structural damage of urban road network after earthquake,defines the disaster resilience of urban road network during the "golden 72 hours" after earthquake,and puts forward the development stages of the disaster resilience in this stage and the corresponding disaster resilience capacites of the corresponding stage.A method to quanify the disaster resilience of urban road network during "golden 72hours" after earthquake is proposed.This paper quanifies the disaster resilience process of urban road network during "golden 72 hours" after earthquake,and extracts the indicators related to the disaster resilience in this stage.Based on the performance response function,the measurement model of disaster resilience of urban road network in this stage is established.On this basis,VBA software and Trans CAD6.0 software are used to develop the application system for operating the measurement model.A method for optimizing disaster resilience of urban road network during "golden72 hours" after earthquake is put forword.This paper proposes an alternative scheme for optimizing the disaster resilience.An optimization model of the disaster resilience is established,which takes the feasibility of the optimization scheme as the necessary premise and follows the principle of utility maximization.Empirical research is carried out.In this paper,the data of the existing local urban road network in Chongqing are investigated,and an empirical study was carried out based on the measurement and optimization model.Finally,countermeasures and suggestions for scientific construction of disaster resilience of urban road network are proposed.Main research conclusions of this paper:First,the disaster resilience of urban road network can reduce the possibility of damage and quickly restore the damaged function of urban road network to cope with the earthquake shock.The greater the disaster resilience of urban road network,the better the effect of emergency rescue after earthquake.The stronger the connectivity of urban road network structure,the less possibility loss of the urban road network function after earthquake.The utility maximization principle is appropriate for comparing and selecting the optimization scheme of the disaster resilienc,which is helpful to make the best optimization determine.Secondly,the disaster resilience of urban road network can resist earthquake shock by reducing the possibility of road interruption and improving the connectivity of road network structure.In the case that the function of urban road network has been damaged after earthquake,the adaptability capacity of disaster resilience of urban road network can adapt to the damage of urban road network function by controlling the chaotic traffic situation after earthquake,so as to give full play to the available function of urban road network after earthquake.The recovery capacity of disaster resilience of urban road network restores the damaged function through engineering emergency repair after earthquake.Thirdly,the average distance between buildings along the street and the road boundary,the sidewalk width beside the road segment,the vehicular traffic lane width,coverage rate of the monitoring system in the urban road network,traffic control efficiency,emergency repair efficiency are in directly proportional to the disaster resilience strength of the urban road network after earthquake.The height of the building along the street and the floor area of buildings along the street are inversely proportional to the disaster resilience strength of the urban road network after earthquake.Fourthly,according to the results of the case study,the disaster resilience of urban road network during "golden 72 hours" after earthquake has the most obvious impact on the post-earthquake emergency rescue.The "golden 72 hours" after earthquake has the time urgency,due to traffic control and engineering emergency repair all need time.The stronger absorptive capacity,the stronger adaptability capacity and recovery capacity.When the recovery time is short,the function of road netwok can quickly meet the demand of the earthquake relief.From the perspective of emergency rescue after earthquake,this paper takes the "golden 72 hours" after earthquake as the time scale to quantify the disaster resilience of urban road network,which provides a new perspective for the related research on disaster resilience of urban road network.The measurement model of disaster resilience of urban road network during "golden 72 hours" after earthquake is establishe,and the corresponding application software system is developed,which provides a scientific new approach and an effective application tool for quantitative analysis of disaster resilience of urban road network.The optimization model of disaster resilience of urban road network during "golden 72 hours" after earthquake is constructed,which provides a scientific and effective decision-making tool for optimizing disaster resilience of urban road network. |
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