| Railway heavy haul transportation has been generally acknowledged as the future direction of the freight transport. Currently, railway transport capacity in China starts tightening, developing railway heavy haul transportation becomes the key to solve the problem. Especially, with the rapid development of the economic, it is imperative to plan and construct the heavy haul transportation corridors. However, a large amount of money and time is needed to build the corridors. Therefore, with limited resources, it is important to implement heavy-haul transformation to the existing railways and build the corridors with large capacity and stable freight flow, for the purpose of alleviating the railway transportation pressure and improving the railway market share in the short term.In this thesis, systematical study on planning and optimizing the railway heavy haul transportation corridors is conducted. In additional to the line facilities for operating heavy haul trains, the corridors also need strategic loading stations, which are able to provide stable freight flow. Around three aspects, namely (1)resource configuration optimization of railway heavy haul transportation corridor system,(2)layout optimization of strategy loading stations and (3)corridor planning based on the existing railway, this thesis does the following researches.(1)Theoretical analysis. The concept of railway heavy haul transportation corridor is defined, components of the corridor are illustrated, and its characteristics, forming mechanism are analyzed.(2) Capacity resource configuration. Resource configuration of the railway heavy haul transportation corridor system is elaborated. Its domain of attractive region is classified to the capacity resource configuration. A model based on different path cost and a determing method of attractive region are established to provide accurate planned wagon flow for railway heavy haul transportation corridor.(3) Layout optimization of corridors utility nodes. Represented by the strategic loading station, this thesis analysed its dependency with the corridor construction. Then a layout optimization model is built based on IA. The method to get the feasible solution is listed and a example proves the validity of the model and the convergence of the algorithm.(4) Planning for heavy haul transportation corridors. Planning principles are illustrated and a corridor planning model based on the reconstruction of existing railway is established. The model adopts the hierarchical method to solve. Primarily, the path importance is defined and two measured indices and path selection method based the reconstruction of existing railway are given. After a flow assignment method based on road network OD sorting is put forward. In the end, a example is given to prove the feasibility of the method. |
