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以重庆市38个区县公路网络为研究对象,以最短距离为原则,在构建公路网络拓扑结构的基础上,计算加权平均旅行时间指标和通达性系数来衡量城市通达性水平的高低,并对通达性水平的特点和空间格局进行分析。结论如下:(1)38个区县的通达性水平呈现出“放射状同心圆”特征,以重庆市主城区为圆心,随着同心圆的半径增加,通达性水平逐渐降低,形成明显的环状分异态势;(2)路网的拓扑连接水平较低,路网等级体系不够完善,网络的辐射效率不高,网络结构相对脆弱,网络的有效性较低;(3)高等级路网发育不均衡,区县间出现通达性差异很大的现象,影响区域的协调发展。
Based on the principle of the shortest distance in the highway network of 38 districts and counties in Chongqing, the weighted average travel time index and accessibility coefficient are calculated on the basis of building the road network topology to measure the level of urban accessibility, Accessibility and spatial characteristics of spatial pattern analysis. The conclusions are as follows: (1) The accessibility of 38 districts and counties showed the feature of “radial concentric circles”. Taking the main urban area of Chongqing as the center of the circle, with the increase of the radius of concentric circles, the accessibility gradually decreased, (2) The road network has a low level of topological connection, the road network rating system is not perfect, the network radiation efficiency is not high, the network structure is relatively fragile, and the network is less efficient. (3) The high-grade road Unbalanced development of the network, there is a big difference between the accessibility of districts and counties, affecting the coordinated development of the region.