Emergency guarantee optimization design method for road network key nodes

Abstract

The invention discloses an emergency guarantee optimization design method for road network key nodes, and relates to the technical field of urban road network emergency guarantee. The method comprises the following steps: respectively constructing importance evaluation index systems of road network nodes in a normal state and after an earthquake; combining a road network node importance evaluation index system in a normal state to obtain a road network node importance grade; combining a post-earthquake road network node importance evaluation index system to obtain a road network node importance grade; combining road network node importance grades in a normal state and after an earthquake, and adopting a risk matrix method to obtain comprehensive importance grades of nodes in the urban road network; and designing an optimization solution process of the model by adopting a genetic algorithm, and optimally selecting an optimal emergency material storage point position. The method can be used for studying the site selection of the emergency resource reserve points in the urban road network area, optimizing the spatial distribution of the post-disaster emergency rescue reserve points, and improving the post-disaster road emergency rescue and guarantee capability.

Description

technical field [0001] The invention relates to the technical field of urban road network emergency support, in particular to an emergency support optimization design method for key nodes of the road network. Background technique [0002] The urban road network is a complex network composed of a large number of nodes (intersections) and road sections. It not only guarantees the daily life and production of urban residents, but also supports key issues such as post-disaster rescue and evacuation and material allocation. However, the components of the road network are closely related, and the overall The distribution range is wide, and it is extremely vulnerable to natural disasters, man-made disasters, traffic accidents and other emergencies, leading to the degradation of some key node functions, resulting in the decline or congestion of local road traffic capacity, and even due to the "cascading failure" effect lead to paralysis of the road network. Studies have shown that ...

AI Technical Summary

Problems solved by technology

Since a single index is difficult to accurately reflect the importance of road network nodes as a whole, a multi-index comprehensive identification method that reflects the importance of road network nodes from different angles has gradually emerged, but too many indicators will also increase the complexity of calculation

In addition, some multi-indicator comprehensive evaluation methods consider the correlation information between indicators, can only give the order of node importance, and need to artificially divide the importance level, the classification and classification results are relatively subjective, and the post-earthquake road network capacity decline is not considered , road network spatial heterogeneity and other issues

The impact damage of the road network unit by the earthquake will lead to the reduction or failure of the traffic capacity of the road network. At present, most of the traffic reliability of the road network after the earthquake is analyzed, and the failure of key nodes or the reduction of the traffic capacity of the road section after the earthquake will lead to the failure of the entire road network. There are few studies on the impact of traffic performance decay, and there are few studies on the optimization method of emergency support for key nodes, and there are many studies on the optimization of material distribution for all demand points after the earthquake.

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