关键词: 交通运输工程, 事故路段, 风险识别, 可拓学

Abstract: In order to reveal the variation characteristics of risk level of traffic accident section, the process of formation and removal of accident scene was divided into four periods, which included the police responding period, the scene safety facilities setting period, the scene exploration and rescue period as well as the safety facilities removing period. 5 risk measurement indexes were selected, including the traffic flow, the information dissemination, the scene disposal, the speed management and the drivers’ response, and the weight of the indexes was determined by the product scale method. Based on the theory of matter-element, extension set and correlation function, the classical domain, joint domain and the matter-element to be evaluated of traffic accident section were determined, and the identification model of risk level of traffic accident section was established. Taking a four-lane highway accident scene for example, the proposed model was used to determine the risk level of each period, and there were four periods. The first period was extremely dangerous, the second one was moderately dangerous, the third one was basically safe and the last one was slightly dangerous. The results show that the evaluation result is objective and the established model can be used to identify the risk level of traffic accident section; the time-varying characteristics of risk obtained can provide theoretical reference for risk identification and control.

Key words: traffic and transportation engineering, traffic accident section, risk identification, extension science