Risk Evaluation Of Dangerous Chemicals Transportation On Xianlin Segment Of Nanjing Raoyue Highway

Fire, explosion or toxic gas dispersion caused by dangerous chemicals road transportation accident often poses great damage to the safety of local population, treasure and environment. Although a lot of related research has been done till now, some disadvantages still can’t be neglected, such as lack of efficient accident data, lack of specific risk research on particular region, simplicity of risk consequence evaluation index, and so on. Thus, further research should be developed against them.Nowadays, more and more dangerous chemical vehicles are passing through Xianlin District as the fourth Yangtze River Bridge has been opened. Besides, the safety control of Nanjing Youth Olympic Games is still very tight. Taking Xianlin segment of Nanjing Raoyue highway for example, this paper formulates targeted dangerous goods road transportation risk regulation plans for this particular area through field investigation and quantitative risk analysis. In the section of accident probability assessment, this paper constructs a new evaluation method through Analytical Hierarchy Process and secondary fuzzy comprehensive assessment according to actual situation. When distinguishing risk influence factors, it not only analyzes conventional influence factors (such as dangerous goods, drivers, transport vehicles and tanks, road and environment), but analyses special influence factors(such as man-made destruction on particular road segment), which makes the result clearer and more accurate. In the section of consequence assessment, firstly classical risk sources are screened, then worst-case accident scenario and alternate-case accident scenario of each risk source are identified. Then this paper uses ALOHA software to simulate different accident scenarios and makes comparison to each other. Besides, it adds the calculation of the number of casualties and the injured, which can provide decision-making basis for quick response of medical rescue. Besides, accident consequence risk maps have been made on the basis of simulation results.Finally, risk management scheme can be drawn by integrating evaluation reports of both parts, including specific risk prevention measures and accident emergency plans. In the part of risk prevention measures, both process management on employees and life cycle management on tanks and vessels are introduced separately. Collective punishment system and information sharing interaction mechanism should be constructed for the local government and Nanjing Chemical Industrial Park. Besides, GPS monitoring and supervision by toll stations are strengthened as well. In the part of accident emergency plans, risk monitoring plan and a set of efficient accident emergency rescue process is made for Xianlin District. And evacuation is emphatically discussed. In addition, regular emergency exercises should be taken for local universities and communities.Real case research shows that this paper provide a new research approach for dangerous chemicals transportation accident risk probability evaluation, which will provide guidance for dangerous goods road transportation risk daily management in Xianlin District, and help safety control of Nanjing Olympic Games and formulate corresponding emergency plans.