Research On Traffic Safety Protective Technology Of Long And Large Tunnel Group Area In Mountain Highway

With the rapid development of highway in China, long tunnels become more and more in the mountain area. Tunnel group region with concealed and zonal structural characteristics have a negative impact on the traffic environment. The worse traffic condition and lower traffic capacity have resulted in decreased efficiency of transportation under large traffic volume. Therefore analysis of the traffic flow characteristics of the highway tunnel group region under large traffic volume and research on traffic safety protective technology have referential significance to improve the level of highway management and to guide the planning of new highway.Based on the survey of traffic safety problem and the original data of traffic volume in highway tunnel group region, the characteristics of traffic accident and traffic flow were studied. And the main cause of traffic accident in highway tunnel group region was analyzed. Then the forecasting model was founded to analyze the development trend of traffic accidents in highway tunnel group region. The accident emergency security system was established to promote the level of safety protective technology. The results and conclusions are as follows:(1) The traffic accident of large tunnel group area in mountain highway was studied. The spatial distribution, time distribution and species distribution of accident were summarized by collecting and analyzing the accident information in Zhejiang province. Then the accident distribution characteristics and the traffic safety problems were researched by comparative analysis on accident information of common road section.(2) Based on the field monitoring data of traffic flow in a typical highway tunnel group region, the traffic flow characteristics were analyzed with statistical analyzing method of the relationship among the speed, volume and density of the traffic flow. The catastrophe characteristics of traffic flow were analyzed on the basis of field monitoring data and the value of critical density was obtained. The early warning measures should be taken in time by management when the monitoring data of density approaches to the critical value.(3) The accident rate of highway tunnel group region was much higher than the common road. It was related to many factors, not only the certain ones such as tunnel environment, traffic facilities, but also the uncertain factors such as the change of traffic flow, psychological state of drivers, weather changes and so on.(4) Based on the original data of traffic accidents in a typical highway tunnel group region, grey forecasting model which was modified by residual error model was founded to analyze the development trend of traffic accidents in highway tunnel group region. The forecasting accuracy was improved by Markov optimization. The method has a better forecasting accuracy and practicality in a period than other common forecasting method. It can be used for the forecasting analysis of traffic accidents and for security early warning in highway tunnel group region.(5) The traffic safety protective technology of tunnel group area in mountain highway was studied. The management of sudden event was analyzed according to the characteristics of accident and emergency rescue. The measures of organization and command system were proposed to be used for the reference of emergency rescue and evacuation in highway tunnel group region...