Research on Transfer Efficiency Optimization Based on Dual-track Tandem Hub
ZENG Zhongzhong
ZHANG Wei
Abstract：Beijing Fengtai Station is the first modern hub in China that adopts a three-dimensional flow system with"upward entry/downward exit for conventional rail"and"lower-level entry/exit at 23 m elevation for high-speed rail".It achieves physical segregation between train flows through vertical stratification.Although its innovative configuration theoretically reduces interference of passenger flows,there are still some operational challenges,including redundant subway transfer pathways and peak-hour node congestion.Based on empirical operational data from Fengtai Station,this study systematically analyzed transfer characteristics in dual-track tandem hubs for the first time.The multimodal transfer scenarios of"conventional rail/high-speed rail/subway"were reconstructed using the AnyLogic simulation modeling to quantitatively evaluate the impact of three-dimensional flow systems on pedestrian efficiency.Moreover,the applicability of different improvement schemes was verified by introducing the widely accepted optimization strategies(e.g.,hierarchical path design and facility capacity adaptation)in the industry.
A comparative analysis of Zhengzhou East Station(single-mode)and Beijing West Station(flat dual-track),which have similar passenger volumes and spatial scales,was carried out.A dynamic passenger flow model was built by combining AnyLogic simulation to quantitatively evaluate transfer efficiency across three hub topologies by using regional density,bottleneck throughput and transfer time as indicators.Results indicated that the stacked dual-track configuration increases transfer time by 1-1.6 times,which is attributed to high reliance on vertical transportation,long interlayer walking distance,and flow conflicts.Optimization strategies for dual-track tandem railway passenger stations on the transfer plane were investigated.A comparative analysis of four specific strategies for the optimization of facility service capability and optimization of line layout was carried out.Results show that improving facility service capability can relieve congestion at nodes significantly,but it influences the overall pedestrian density of spaces slightly.On the contrary,optimizing line layout can greatly affect the overall transfer efficiency and pedestrian density of spaces more significantly.According to further observations,optimizing line layout is superior to optimizing facility service capacity in terms of improving transfer time,overall pedestrian density in spaces,and pedestrian flows at nodes.It concludes that there is a significant difference in improvement efficiency between line and service facility optimization.In the transfer spaces of built stations,optimizing line layout is the best solution to relieve the pressure of passenger transfer.Optimization of line layout can reasonably reduce the cross-flow of passengers by optimizing line layout,thus improving the passenger flow rate in the whole space.This study is innovative because it breaks the limitations of existing studies on transfer efficiency optimization of railway hubs and proposes the optimal strategy to optimize the line layout.Research results provide theoretical references and practice paradigms for planning,design,and operation management of the same type of complex hubs.It fills in the blank of empirical studies on dual-track tandem hubs in China.
Keywords：anyLogic simulationcomparison of optimization strategiestransfer efficiencyspace optimizationdual-track tandem system
Publication Date：2025-06-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 60-67 )