成渝地区双城经济圈高铁网络通达性的溢出效应OA北大核心CSTPCD

The Fourteenth Five-Year Plan of China has proposed the acceleration of the construction of a strong transport nation.The Outline for the Construction of a Powerful Transportation State emphasizes that it is necessary to focus on the general objective of the construction of a powerful transportation state and create a"123 traveling and transportation circle in the country"and reach the new standard of 1-hour commuting metropolitan area,2-hour connecting urban agglomeration,and 3-hour coverage of the major cities in the country,which determines the importance of the accessibility of urban agglomeration in the strategy.The high-speed railway network in the twin-city economic circle of the Chengdu-Chongqing region enhances inter-city accessibility and has a spillover effect on socioeconomic development.Starting with HSR network accessibility,in this study,the evolution of the accessibility pattern after the opening of the HSR in 2015,2020,and 2025 was analyzed using the shortest inter-city travel time,weighted average travel time,and daily accessibility index.Based on the gravity model used to measure the economic reinforcement effect generated by HSR network accessibility,the spatial Durbin model was used to explore the spillover effect of HSR network accessibility on the tertiary industry's economic development from 2015 to 2020.The study results demonstrate that the HSR network improves the level of urban accessibility,narrows the gap of accessibility level between cities,weakens the regional accessibility circle structure,and exhibits significant corridor effect.The HSR network generates a significant spatiotemporal convergence effect.The direction of spatiotemporal convergence of core cities is to expand uniformly to their surroundings,and the direction of expansion of edge cities is mainly to spread along newly opened HSR lines in the form of a belt.The improved accessibility of the HSR network will strengthen regional economic ties,narrow the gap between the attractiveness levels of non-core cities,and enhance the twin-core phenomenon.Increased accessibility is conducive to the economic development of the tertiary industry in neighboring cities,with an increase of 1 percentage point in the accessibility of the high-speed rail network in the neighboring region,leading to an increase of 0.3088 in the local tertiary industry.An increase in the tertiary economic level of neighboring cities will inhibit the development of the local tertiary economy,which may be because the Chengdu-Chongqing region is now more competitive than cooperatives in terms of urban relations;therefore,regional development is still in the siphoning stage.The possible contribution of this study is reflected in the use of accessibility as the core research and explanatory variable to explore the economic spillover effects of accessibility of high-speed rail networks in typical case regions.It aims to reveal the impact of high-speed rail network accessibility on the economy and industry,summarize the theory of spillover effect,and provide a theoretical reference for high-speed rail construction,regional planning,and economic layout optimization.