公路平曲線段路側(cè)事故預(yù)測與風險評價方法研究
[Abstract]:The death rate of road side accidents is very high in all kinds of highway accidents, and the safety situation of highway side in China is not optimistic. To improve the safety level of road side, it is necessary to accurately evaluate the risk of road side accidents in order to take targeted measures. This study can also provide a theoretical basis for the rational setting of road side clear area. In this paper, based on the theory of vehicle driving, the calculation model of the maximum safe speed of the vehicle on the road side without deviating from the lane is constructed based on the road alignment and road conditions. By using the normal distribution function, this paper presents a new method for calculating the maximum safety speed of the vehicle in the flat curve section of the highway. The prediction model of highway speed distribution is constructed. When the maximum safe speed is corresponded to a percentile speed on the cumulative frequency curve of the velocity distribution, the proportion of the speed in the traffic flow higher than the maximum safe speed can be obtained, that is, the probability of the vehicle coming into the road side accident. The multivariate relationship model between the model and driving speed, highway alignment index and attachment coefficient is constructed, and an example is given. In order to divide the threshold value of the factors affecting the road side accident in the horizontal curve section, the road side accident pattern is selected as the index. Based on the historical accident data and the simulation data obtained by the accident simulation software, the accident result data are quantitatively analyzed by setting different vehicle entry speed and road side environmental variables. According to the state of the vehicle entering the side of the road, the road side accident can be divided into four levels of severity: no slight deviation, slight landing or falling down, up to twice overturning and more than two overturning accidents. Based on the threshold of road side accidents, a Bayesian network is established to evaluate the risk of road side accidents. The probability of road side accidents with different severity can be obtained by calculating the conditional probability of road side accidents caused by road side accidents and substituting the probability of road side accidents into the Bayesian network topology which calculates the probability of road side accidents. Based on the grey clustering theory, the risk evaluation is carried out on the side of the road when there are obstacles, and the criterion of the threshold value is given. The results of Bayesian network reasoning are compared with the results of the road side accident simulation test, and the accuracy of the proposed risk assessment method is proved by selecting the typical vehicle type of road side accident for case analysis. The research results of this paper are expected to provide theoretical basis and decision reference for road traffic planning, construction and maintenance of road traffic engineering, and to improve the safety of highway side in China.
【學(xué)位授予單位】:哈爾濱工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:U491.31
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