Study On Accessibility Of Urban Channel Of Disaster Prevention Based On Space Syntax

Evacuating channel is an important part of urban earthquake disaster prevention planning, scientific selection of its section and rational distribution of network are the foundation to guarantee the stable operation of the city when the earthquake occur. Currently, the research of evacuating channel mostly about two aspects, the one is for Engineering technology, such as road reliability and bridges reliability. The other is Macro overview such as class divide, width control and planning principles. But its lack of theoretical aspects of planning support. Mathematical model is an accurate method of research questions, how to use mathematical models to solve the rational layout of evacuating channels in the information age is one of the main topics of current research. Based on this, the accessibility theory and evacuating channel combined with accessibility evacuating channel for the study, combined with demonstration projects applied a mathematical model to explore the space syntax research accessibility for evacuating channel, and make shock evacuation routes optimal accessibility layout scheme.This article summarizes the basis of concepts for accessibility and common metrics method, by analyzing the shock of evacuation routes and characteristics for the relevant requirements, This article propose suitable for evacuating channel accessibility of the three metrics, namely connectivity index, road accessibility index and the degree of influence, and to analyze the relationship between the space syntax syntax five variables, as space on the method of evacuating channel accessibility study basis. Use of space syntax global and local variables, global variables local roads accessibility feature selection evaluation factor and the global road network of evaluation factors, and thus the accessibility of the channel by three metric space syntax of five evaluation factors on two levels give reflection. Also re-establishing local and global relevance of evaluation factors by space syntax intelligence value to the overall relevance of the channel given study. And to establish evacuation routes shock accessibility evaluation model, respectively evacuating road accessibility, the road network of channels and give their assessment of the overall relevance.Combined with the relevant requirements of the road grade and the width evacuating channel, this article is used space syntax mode to judge the main roads of Donghai county for their accessibility., and map out the early programs.of evacuation routes Through the model of the road network and overall relevance of the initial adjustment programs give analysis to determine the final plan. The results show that: the layout of the model derived by space syntax Donghai County Center City evacuating passage reasonable overall, partly due to the width of the road is narrow, low grade, but with higher accessibility and accessibility of the entire road network has improvement by analyzing the recommendations in selecting evacuating channel. This study was evacuating channel layout provides a new idea, and provide theoretical guidance and methods for the rational distribution of other cities evacuating channel reference.