Metro Accessibility Research Based On Space Syntax

In recent years, the pace of urbanization of our country is accelerated obviously, with the gradual expansion of urban scale and population scale, it is inevitable to bring all kinds of complex problems to the sustainable development of urban traffic.City subway with its unique technology and economic advantages to play an important role in alleviating the pressure on urban traffic, and favored by many big cities. A large number of large and medium cities including Shijiazhuang, the metro projects are being planned and constructed in full swing in succession. Only if scientific line network planning and rational distribution of spatial structure can they give full play to the overall efficiency of the subway, and to maximize resource utilization. So we urgently need to explore effective theories and methods,combine the actual case,scientifically test the rationality of the layout of the wire mesh,evaluate the accessibility of the network.So as to establish a comprehensive and accurate understanding of the subway traffic line network.So that in a timely manner to grasp the comprehensive benefits of the subway network, and enhance the predictability of the state of traffic development, and ultimately guide the healthy development of the subway traffic.This paper introduces the related concepts of accessibility,Summary and comparison the characteristics and application fields of the classical reachability calculation method.Results from the perspective of space syntax, the topology method is a suitable method to calculate the subway traffic network.This paper deeply analyzes the basic principles of space syntax.It is recognized that the space syntax can translate the abstract spatial entity into variable parameters which can reflect its topological features.Based on this,by constructing a joint evaluation system which is composed of the whole integration degree, the partial integration degree, the easily perceived degree and the spatial recognition degree, the evaluation system can be realized.In this paper, we use the axial model of space syntax,take Shijiazhuang city subway line network as the research object, with depth map space syntax software (depthmap 10.0),realize the topology calculation of the two sets of planning line network on Shijiazhuang Metro short term and long term,get the corresponding syntax variable value.Through the analysis andcomparison of the overall integration of the corresponding line network, the degree of integration, easy to perceive, spatial recognition of the four parameters of the characteristics of the syntax variables.Combined with the reality of land use development and the overall layout of the urban space to evaluate the accessibility and comprehensive performance of Metro Planning line network in two periods.The results show that the comprehensive benefits of the recent planning line network is better, the accessibility is better, and matched with current situation and development degree of urban land use.The reachability of the network of future planning is slightly lower than the accessibility of the recently planned line.Its layout lacks of coordination, and its comprehensive performance is poor, can not meet the needs of the long-term development prospects of City metropolitan space cooperation.