Road Traffic Organization Theory And Method Of Accident Disaster In City

Along with rapid urbanization and economic development, a lot of people flood in city, the city has been very crowded, contradiction is very sharp between limited resources and intumescent population in city, city problems come forward constantly, large-scale and mixed crisis break out frequently in large city, therefore, we need study the way to deal with the situation positively. Emergency evacuation is the important measure to deal with unexpected events in the world. However, emergency evacuation involves huge area with big difficulties and uncertainties, At the same time, there needs a high level of traffic organization and management in the process of evacuation. It should be noted that China is still at the infant stage in terms of research for the emergency evacuation. In order to deal with emergent incidents scientifically, the central government includes transportation evacuation project in its national "tenth—five plan" and takes it as the key scientific research target. As a result this study is conducted based on this project as well as under the planning and workout of traffic organization theory and method of accident disaster in city.This subject of paper is traffic organization theory and method of accident disaster in city. On the base of analyzing the characteristic of accident disaster and traffic flow, this paper submits aimed traffic emergency organization theory and method, structures intelligence traffic organization system, sets up traffic control and guidance model based of emergency traffic flow. At last, this paper judges traffic emergency grades by fuzzy mathematics, and drafts traffic emergency preplans in concert with traffic emergency grades.At first, this paper defines connotation of accident disaster in city, and determine study object:accident disaster in city means that it happens in city, leads to serious casualties, property loss, society influence, refers to society safety's accident events, and traffic evacuation takes key role to deal with accident disaster. It mainly involves traffic accident, fire, explosion, dangerous chemicals leakage, nucleus radiation accident. Secondly the paper analyses uncertainty, momentary, point cause and surface influence of accident disaster in city, and the difference between emergency traffic flow and regular traffic flow:time and space inhomogeneous degree, obvious and large peak value, no regular short time trip, "single source many confluence" network flow, extreme traffic direction coefficient, follow traffic flow, these lay the foundations of aimed traffic organization measures.On the base of analyzing traffic flow characters and application of all kinds of traffic organization methods in city, the paper brings forward traffic organization methods on emergency, involving union between one-way traffic and special lane, temporary traffic channeling, banning turn traffic and signal control, and sets up signal control model on emergency. The paper poses frame figure of intelligence traffic organization system and establish traffic evacuate route guidance model on emergency based on application technique of intelligence traffic system.Before traffic emergency organization to accident disaster, it is needed to give a clear-cut traffic emergency grade based on considering numerous influence factors of accident disaster comprehensively. Like this, traffic emergency measures can be adopted rapidly to deal with accident disaster scientifically. However, influence factors of accident disaster are too many, and a majority of influence factors and influence degree are quantized difficultly, this problem is solved by fuzzy mathematics easily. Therefore, the paper selected the main influence factors of accident disaster as judgement indexes (such as:influence people number, scope, road network and traffic manage), applying fuzzy synthesis judgement models to judge traffic emergency grades, and working out traffic emergency preplans in concert with traffic emergency grades.At last, the paper applied study achievement to fire of Hanzheng-street CBD in Wuhan as a case to validate adaptability and operation of theory and method submitted by this paper.The paper treated accident disaster in city as special study objects for the first time, taped communal obvious features of all kinds of accident disasters. A entire systematic theory and method are put forward from judging traffic emergency grade, starting traffic emergency preplans, to carrying out traffic organization measures for improving traffic organization management and policy decision level of dealing with accident disaster in the round, strengthening practice and operation of traffic emergency preplans, optimizing operation effect of traffic emergency preplans.