Study On Safety Assessment And Driving Safety Improvement Technology Of Long Steep Downgrade Of Mountain Expressway

In recent years,with the continuous development of China’s traffic construction,the mountain highway network in China has also been continuously improved,and the mileage of mountainous highways has also increased.However,due to the restrictions of topography,geology and economy,there are always long and downhill sections of mountain expressways.As the accident-prone sections of mountain expressways,the traffic safety situation is grim.In order to improve the traffic safety of mountain expressway effectively,the long downhill section must be an important part of the traffic safety research of mountain expressway.Therefore,this paper starts from the characteristics,causes and influencing factors of traffic accidents in the long and downhill sections,the safety evaluation of the long and downhill sections and the driving safety promotion technology of the long and downhill sections,and carries out a systematic and comprehensive study on the driving safety of the long and downhill sections.According to the traffic accident data of the long downhill section of mountain expressway,the characteristics,causes and influencing factors of the traffic accident in the long downhill section of mountain expressway are analyzed.On this basis,the brake drum temperature,the total weight of the vehicle and the cargo,the operating speed,And the speed dispersion is used as the safety evaluation index of this article,and the safety characteristics of each safety evaluation index are analyzed.Then,the safety evaluation of the long downhill section is carried out,and GSRS brake drum temperature rise model is selected to predict the brake drum temperature of the truck under different total vehicle weight and operating speed.The research and analysis of the total weight of the vehicle and the operating speed on the brake drum temperature Based on the predicted temperature of the brake drum,the safety evaluation of the long downhill section is carried out,and the speed limit value corresponding to the total weight of different vehicles and goods is obtained.Based on Trucksim simulation software,establish models of cars,drivers and roads,simulate the driving state of trucks under different total truck weights and running speeds on long and large downhill sections,and obtain the speed and acceleration curves of vehicles under different driving conditions.The driving safety of the long and large downhill section is evaluated,and the rationality of the evaluation conclusion of the brake drum temperature prediction model is verified.Finally,from the aspects of speed limit,safety guarantee measures and auxiliary brake devices of freight cars,the paper studies the driving safety improvement technology of the long and downhill sections respectively.Based on the safety evaluation conclusions,the paper puts forward the driving safety improvement technical scheme of the long and downhill sections and the overall driving safety improvement measures of the long and downhill sections.Based on the research on the traffic safety of the long and large downhill section of the mountain expressway,this paper proposes a reasonable safety evaluation method and effective driving safety improvement technology for the long and large downhill section,and establishes an "analysis-evaluation-improvement" system.The safety improvement system provides a theoretical basis for improving the driving safety of long and large downhill sections where highway accidents frequently occur in mountainous areas.