Abstract
To study the performance and mutual influence of a syncretic railway network (SRN) that comprises high-speed railway, regional railway, and urban rail transit under the condition of traffic overload during peak hours, we discuss the interdependent characteristics on cascading overload failure of SRNs under the cooperative organization from the perspective of an interdependent network. However, most existing research on cascading failure in interdependent network ignores the inconsistency between the physical structure and transportation organization of the subnetwork in an actual network, in addition to the restrictions on the load redistribution strategy of stations and sections in the load-capacity model of the interdependent network; especially, the influence of transfer behavior on the load redistribution inter subnetwork. In this study, we investigate the robustness of an interdependent SRN under overload and risk propagation. We propose a partially interdependent network model of a multimode rail transit, develop a novel cascading overload failure model with tunable parameters of load redistribution inter subnetwork, and analyze interdependent characteristics, cascade failure process, and robustness of an SRN under multiscene conditions, i.e., different attack and load distribution strategies, via simulations. A case study of an SRN in the metropolitan area of Chengdu, China is presented; the results indicate that, when the reserve coefficient of the metro subnetwork is 0.4 and the overload coefficient of the regional railway subnetwork is greater than 1.2, the station reserve capacity and overload capacity of the SRN is appropriately improved. When passenger load increases to a certain range, the reserve and overload capacities of stations in the regional railway subnetwork do not considerably contribute to robustness. Thus, a surplus load distribution strategy is recommended to improve robustness. The results of this paper have considerable significance for the planning, structural optimization, and operation safety of SRNs.
Highlights
With an increase in urban agglomeration in China and the progress in rail transit technology related to construction, multimode rail transit systems have played an important role in the economic spatial connection of urban agglomerations
When an syncretic railway network (SRN) is in an abnormal circumstance such as a sudden increase in passenger flow or deliberate terrorist attacks, some stations are disturbed by internal and external factors that result in overload or failure; this leads to changes in passenger flow volume (PFV) in these affected stations
When the load increases to a certain range, the increase in the overload capacity of the regional railway subnetwork (RRN) does not considerably contribute to the robustness
Summary
School of Transportation and Logistics, Southwest Jiaotong University, Chengdu, China, 2 National and Local Joint Engineering Laboratory of Comprehensive Intelligent Transportation, Southwest JiaoTong University, Chengdu, China, 3 National Engineering Laboratory of Integrated Transportation Big Data Application Technology, Southwest JiaoTong University, Chengdu, China
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