基于运行车速的山区高速公路长大纵坡交通安全研究

发布时间：2018-12-06 16:51

【摘要】：山区地区险峻,道路易形成长且大的纵坡。因为车辆性能指标各不相同,汽车运行时运行速度会相差较大,货车行驶车速低,致使后面运行的小车频繁超车换道,从而引发交通事故;长大下坡地段为保持车辆稳定行驶而强制制动,导致其性能下降,甚至出现制动失效现象,行车安全受影响。所以研究长大纵坡地段的安全问题,对提升山区道路的行车安全意义深远。本文在分析了国内外相关的研究成果的情况下,结合实地调研,通过非事故率法来研究长大纵坡路段的交通安全。研究上坡运行情况,本文建立了VISSIM仿真模型,借助VISSIM基于坡度、坡长、交通量、大车混入率为影响因素对爬坡的行车安全进行仿真试验,得出四个参数对行车安全的影响规律,分析得到改善措施。研究长大下坡路段,本文通过分析两种代表车型大、下车的行驶特性,运用多元非线性回归的方法,建立了两种代表车型在长下坡地段与坡度、坡长和半径的速度预测模型,从而计算出运行车速的预测值,以此将下坡路段按危险程度进行分级,通过危险度等级确定危险路段,为交通安全研究提供数据支持,反映出安全现状进而提出解决方案。论文结论能够对以后山区道路长大坡度的设计给出一定的参考价值,同时对长大纵坡的安全改善措施有一定的指导价值。
[Abstract]:Mountain areas are steep and roads tend to form long and large vertical slopes. Because the vehicle performance indexes are different, the running speed of the vehicle will differ greatly, and the speed of the truck will be low, which will cause the small car running in the rear to overtake and change the road frequently, thus causing the traffic accident. In order to keep the vehicle running stably, the forced braking in the long downhill section leads to the deterioration of the performance and even the failure of the brake. The safety of the vehicle is affected. So it is significant to study the safety of long longitudinal slope to improve the driving safety of mountain road. In this paper, based on the analysis of domestic and foreign related research results, combined with field research, the traffic safety of long and long longitudinal slope sections is studied by non-accident rate method. In this paper, the VISSIM simulation model is established to study the running condition of uphill slope. With the help of VISSIM, which is based on slope, slope length, traffic volume and vehicle mixing rate, simulation tests are carried out on the driving safety of climbing slope, and the influence of four parameters on the driving safety is obtained. The analysis resulted in improvement measures. In this paper, by analyzing the driving characteristics of two kinds of representative vehicles and getting off, using the method of multivariate nonlinear regression, the speed prediction models of two kinds of representative vehicles in long downhill section and slope, slope length and radius are established. The prediction value of the running speed is calculated, and the downhill section is classified according to the degree of danger, and the dangerous section is determined by the grade of danger degree, which provides data support for the study of traffic safety and reflects the present situation of safety and puts forward the solution. The conclusion of the paper can give some reference value to the design of the mountain road growth slope in the future, at the same time, it has certain guiding value to the safety improvement measures of the long longitudinal slope.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U492.8

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