Research On The Site-selection Of Emergency Resource Reserved Station For Underground Logistics System Based On Multiobjective

As an emerging logistics and transportation mode,underground logistics system(ULS)has many advantages such as no ground transportation,clean and environmental protection,stable and efficient,and provides a feasible solution to alleviate urban traffic congestion.However,the research and practice of ULS has just begun.There are no mature and successful cases to learn from,and compared with other logistics methods,ULS is more complicated,costly,risky,and the underground space is relatively closed.Once a fire or earthquake occurs,Floods,large-scale power outages,train failures and other emergencies,resources are difficult to deliver in the first time,the overall rescue is difficult.Therefore,at the beginning of planning and designing the ULS,considering the disaster prevention and resilience of the system,several emergency resource reserved stations(ERRS)are established.The emergency resource reserved stations stores the corresponding materials,equipped with relevant emergency disposal equipment and personnel.After the emergency occurs,according to the relevant instructions of the emergency management information system,the rescue resources will be delivered to the incident site through the emergency rescue vehicles at the first time.,coordinate the rescue.Due to the shortcomings and high risks of ULS,once an emergency occurs,it is difficult to rescue.Therefore,it is necessary to consider and improve the ULS emergency management system at the beginning of planning and designing the underground logistics network.Consider combining the two,in the ULS network and site planning,selecting the ERRS site group to provide a hardware foundation for improving the emergency management system of ULS.In addition,in the construction of ULS underground sites(node groups)and tracks(paths),in order to save costs,make full use of underground space,reduce construction repeatability,reduce security risks,improve emergency response and rapid response capabilities,etc.,at the ULS node Several nodes are selected in the group to build an ERRS site.After discussing the logical relationship between ULS and ERRS,the location and function of ERRS,and the key points and influencing factors of ERRS selection,the construction and improvement of ULS and ERRS can be carried out in two steps: in the first step,the ground part of the traffic is introduced into the ground according to the traffic performance index(TPI)to construct the node group and path of the ULS;the second step is based on the node group and the path.Consider the selection of the multiobjective location model with the minimum number of ERRS and the shortest emergency delivery time,abbreviated as the two steps MUE site-location model.Based on this model,combined with the relevant data in the study,we use the set cover-greedy algorithm and the Prim algorithm to determine the node group and the corresponding path in the first step model.Based on this,we use the non-dominated sort with elite strategy.The genetic algorithm(NSGA-II algorithm)gives a set of Pareto optimal solution sets of the second-step model,calculates the number and location of ERRS and the service range of different stations and delivery time,and the results of the model.At the same time,it gives three suggestions for consolidating the hardware foundation of ULS emergency management system,perfecting the software support of ULS emergency management system,and building ULS command system.For the sake of analysis,decision makers can choose according to their needs.This paper focuses on the location of the ERRS as the hardware foundation of the ULS emergency management system,which can provide theoretical support for the underground logistics system and its emergency management work,can be used in the exploration and development stage,and can provide decision-making reference for the relevant cities of the proposed underground logistics system.It is more helpful to improve the emergency rescue capability and emergency management level of ULS and improve the emergency rescue system and system in practice.