成渝城市群区域轨道交通网络结构的组织特征及时空演化

区域轨道交通网络作为城际交通 运输系统中的主要基础设施，对区域空间结 构的塑造具有重要影响。以区域轨道交通客 运车流组织联系为切入点，从中心性、脆弱 度、子群分布、通达性格局四个方面出发，对 成渝城市群轨道交通网络结构的组织特征和 演化进行了认知。结果表明：一、中心性，轨 道交通网络密度达到历史最低值，网络化空 间格局初步显现，城市资源控制力分层明显； 二、脆弱度，轨道交通网络脆弱度各时期不 稳定起伏，至2014年，网络稳定性达到最强； 三、子群分布，不同时期的轨道交通网络城市 子群分布特征存在差异，已初步形成成德绵 乐城市带、渝东南和重庆大都市区三大紧密 联系的城市子群；四、通达性格局，网络连通 性能、扩展潜力和整体交通可达性达到历史 最优水平，可达性居首位的城市在空间分布上 经历了“荣昌—内江—资阳—重庆主城—潼 南”的动态演化过程；五、阶段划分，成渝城 市群区域轨道交通发展可分为稳步建设、完 善优化、扩展延伸和网络化四个阶段。

The Organization Characteristics and Evolvement of Regional Rail Transit Network Structure of Chengdu-Chongqing Urban Agglomeration

As the main infrastructure of urban transportation system, regional rail transit network has an important influence on the shaping of regional spatial structure. Taking the passenger fl ow organization as the starting point, organizational characteristics and evolvement of rail transit network structure are analyzed from 4 aspects of centrality, vulnerability, distribution of subgroups and accessibility. Some results have been found: (1) Centrality. Density of regional rail transit network has reached the lowest value. Network right focuses on a few cities, and the level of control of urban resources is obvious. (2) Vulnerability. Network vulnerability period is not stable and network stability is the strongest of all periods in 2014. (3) Distribution of subgroups. In different periods, distribution of urban subgroups is different, and 3 major urban subgroups of Chengdu-Deyang-Mianyang-Leshan City Zone, Southeast of Chongqing and Chongqing metropolitan area are formed initially. (4) Accessibility. Network expansion potential and the overall accessibility have reached the historical optimal level. Accessibility of the fi rst urban space experiences the dynamic evolution process from Neijiang, Rongchang, Ziyang, Chongqing to Tongnan. (5) Stage division. Regional rail transportation development can be divided into 4 stages: steady construction, optimizing, extension and networking period.