Research On Roadside Safety Assessment And Fault-tolerance Technology Of High-level Roads In Mountainous Areas

At present, traffic accidents have happened frequently, which caused extensive attention of the whole society. And highway roadside accident accounted for more than30%of the road accident, characterized with group death and group injury. Therefore, it is very important to research on roadside safety, to select effective protection technology facilities, to carry on scientific roadside environment design, to provide drivers a good roadside environment.Based on a systematic review on domestic and abroad roadside outline environment research situation through the consulting the related literature, roadside safety assessment model was established which combined entropy and matter-element extension in high level roads in mountainous area. The performance of protection facilities, such as safety barrels and emergency parking strips were discussed.The main research contents and conclusions in this paper are as follows:(1)Based on roadside accident characteristics analysis, fault tree analysis (FTA) and Surry Model were analysised to determine the reason of roadside accident. The result showed that roadside accident was combined of factors of person, car and road environment.(2)According to the two kinds of hazard theory and the concept of risk, roadside hazard was identified and the hazard gradation principle was determined. Thus, roadside hazard safety rank table was planned. Then this table was used in Hunan provincial road Zhangsang highway, which could quickly check out the existing road hazards, and corresponding improvement strategy was put forward.(3)15indexes were selected in terms of road alignment, roadside danger, roadside protection technology and roadside landscape to establish evaluation index system. Moreover, the entropy was used to weight index weight, and matter-element extension theory was adopted to evaluate. Then the roadside safety evaluation model was set up. After that, this model was used in Hunan province Zhangsang highway, which was proved that this model was reasonable. (4)Roadside fault-tolerant, roadside fault tolerant ability, roadside fault-tolerant technology concept were put forward. Then the reasonable roadside safety facilities input to achieve the goal effective fault-tolerant were studied, and the protection technology setting reference value was provided as reasonable roadside environment design in freeway, level1, level2highways respectively.(5)LS-DYNA and orthogonal test L9(34) were used to simulate the collision experiment between the car and safety barrels and to obtain the optimum size, position and new structure in freeway and general highway.(6)Ergonomic was applied to analysis the drivers’driving action and vehicle trajectory, and the emergency parking area strips size and emergency parking area reasonable was put forward.