引入可达性的概念,以现阶段与预期2030年的湖南城市群综合铁路网数据为基础,选取加权平均旅行时间、经济潜力和日常可达性3个度量指标,比较分析了高速铁路的发展对湖南城市群城际间8城市可达性的影响。结果表明:高速铁路大大缩短了城际之间的时空距离,将全面提升湖南区域可达性水平,促进区域均衡化空间结构的形成;另一方面,尽管高速铁路将推动多中心空间结构的形成,但对湖南城市可达性水平的影响具有明显的区域差异,可分为两个层级,各城市在新的交通格局下应抓住机遇,探寻符合自身特点的发展道路。

Transportation network system has significant effect on the optimization of spatial structure of urban agglomeration. Since inauguration of the first high-speed rail, Japan's Shinkansen, extensive studies on high-speed rail's influence on urban and regional development have been done. Reviewing both domestic and international studies, we found that most scholars consent to the existence of high-speed rails' influence on urban and regional development through changing location's accessibility, movement of production factors and regional comparative advantages. With the approaching High-Speed Railway Age, Hunan urban agglomeration regional spatial structure will changes significantly. With the introduction of the concept of accessibility and the measurement factors of weighted shortest travel time of the transport network of 2011 and 2030, this paper concludes that the development of High-Speed Railway has the following effects on Hunan urban agglomeration regional spatial structure. First of all, High-Speed Railway completely enhances accessibility within Hunan urban agglomeration eight cities, greatly shortens temporal and spatial distance between cities,promotes the integrated development of the Hunan urban agglomeration eight cities and boosts formation of regional balance of the spatial structure by formation and development of metropolitan area and economic developing axis. Secondly, High-Speed Railway accelerates the formation of multi-central spatial structure, but it differently affects the accessibilities of different cities. Hunan urban agglomeration can be divided into two classes: The first class is Changde city, Yiyang city, Loudi city and Xiangtan city; the second class is Yueyang city, Zhuzhou city, Changsha city and Hengyang city. So, different cities should seize the opportunities and seek their own development strategies, according to their different characteristics under the High-Speed Railway Age.