Abstract: Taking Chengdu-Chongqing urban agglomeration as the research object, the influence of the opening of high-speed rail on Chengdu-Chongqing urban agglomeration was discussed from the perspective of efficiency and fairness. Firstly, with average travel time and weighted average time as input indicators and daily accessibility and economic potential as output indicators, the accessibility level of Chengdu-Chongqing urban agglomeration was analyzed from different aspects. Secondly, DEA model was used to construct comprehensive accessibility index to analyze the influence of high-speed rail opening on the accessibility efficiency of Chengdu-Chongqing urban agglomeration. Finally, based on the comprehensive accessibility index, the variation coefficient and Spearman coefficient were calculated to reflect the influence of the opening of high-speed railway on the spatial equity of Chengdu-Chongqing urban agglomeration. The research shows that: After the opening of high-speed railway, the accessibility level of Chengdu-Chongqing urban agglomeration has increased significantly, the economic attraction capacity of cities within Chongqing has been significantly improved, and cities within Sichuan province have more development opportunities and greater economic benefits. The accessibility efficiency of cities within Chongqing is obviously better than that of cities within Sichuan Province. The spatial pattern of accessibility efficiency of Chengdu-Chongqing urban agglomeration shows the distribution trend of “core-periphery”. The hinterlands of the main urban area of Chongqing and Chengdu, two major growth poles, are expanded, and the connections between and within the two economic circles are strengthened. The opening of high-speed railway has caused “corridor effect” and “spatial polarization effect”, which has aggravated the unfairness of development between stations and non-stations, within and between the two economic circles.

Key words: traffic and transportation engineering; accessibility efficiency; spatial equity; DEA model; high-speed rail; Chengdu-Chongqing urban agglomeration

摘要： 以成渝城市群为研究对象，从效率和公平角度出发，探讨了高铁开通对成渝城市群的影响。首先以平均旅行时间、加权平均时间为投入指标，以日可达性、经济潜力为产出指标，从不同侧面分析成渝城市群的可达性水平；再者利用DEA模型构建综合可达性指标，分析高铁开通对成渝城市群可达性效率的影响；最后在综合可达性指标的基础上，测算了变异系数、斯皮尔曼系数，以反映高铁开通对成渝城市群的空间公平性影响。研究结果表明：高铁开通后成渝城市群可达性水平大幅上升，重庆市境内城市的经济吸引能力明显提升，四川省境内城市拥有了更多发展机会及更大经济效益；重庆市境内城市的可达性效率明显优于四川省境内城市，成渝城市群可达性效率空间格局呈现出“核心-外围”分布趋势，重庆市主城区、成都市两大增长极腹地范围扩大，两大经济圈内部及之间的联系加强；高铁开通引起了“廊道效应”和“空间极化效应”，加剧了站点与非站点城市间、两大经济圈内部及之间发展的不公平性。

关键词: 交通运输工程；可达性效率；空间公平性；DEA模型；高铁；成渝城市群