| Under the dual pressure of rapid urbanization and motorization,the ground traffic problems and conflicts on the roads of most first-tier and second-tier cities are becoming more and more prominent.In this context,the urban logistics distribution mode with ground transportation as the main mode increases the road load,intensifies the ground traffic congestion,increases the delay risk of logistics terminal distribution,and reduces the efficiency of distribution.The rail transit line covers a large area and the operation scope covers the central area of the city and the population concentration area,so it can make full use of the transportation value of the rail transit network resources in the region,give full play to its advantages and expand a new added value.Based on the research on urban underground logistics at home and abroad,this thesis points out the shortcomings and deficiencies of the traditional above-ground urban logistics system existing in most large cities,and proposes the idea of sharing the pressure of above-ground logistics by underground logistics system.Firstly,the organization form and network of urban underground logistics are studied,and based on the analysis of underground logistics distribution mode,the line rail type is selected as the organization form of urban underground logistics,and its vehicle setting and organization mode model are studied,which provides the theoretical basis for the following calculation of material flow and simulation model design;secondly,the subway logistics distribution network model is established,and the model design is based on genetic algorithm with the average distribution The model design is based on genetic algorithm with the shortest average distribution time as the goal,and MATLAB software is used to solve it according to different practical situations;then the simulation modeling of metro logistics terminal is carried out by relying on Any Logic simulation software metro station scenario,and the metro layer and ground layer models are established respectively according to the functional design and logical flow,and indicators such as operation time and utilization rate of facilities and equipment are established;then,taking Tianjin metro as an example,combined with Tianjin Finally,taking Tianjin metro system as an example,we analyze the express transportation demand,analyze the construction level of Tianjin metro network,and determine the logistics capacity by combining factors such as operating mileage,passenger volume,running time,travel interval and passenger flow distribution;finally,we use the relevant models and methods proposed in this paper to construct the Tianjin metro logistics network.The study shows that the Tianjin metro network is still in the construction stage of forming a network line by line,while the intensity of passenger flow is low,and the time distribution of passenger flow is obvious commuting characteristics,it can organize underground logistics transportation business through the line rail network using common line trailer or mixed passenger and cargo transport mode at 10:30-16:30 and 20:30-23:00 every day,and all trains can provide a full load of 2000-3000 tons of logistics capacity.It can choose to open transshipment points and pickup points according to actual demand,transfer10% of Tianjin express cargo flow to underground,run about 1170 trains,open 6 logistics centers,10 transshipment points and about 80 subway stations to meet the daily demand of about 500 tons of cargo transportation,and model the loading and unloading,handling and storage operations of cargo on the more common side subway platforms in Tianjin,with each process time less than train interval time,the facilities are well utilized,and the metro logistics business can be carried out smoothly. |
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