关键词: 道路工程;道路安全；物元可拓模型；DEMATEL-ISM；熵权法

Abstract: In order to accurately determine the road safety level and figure out the key factors affecting road safety of highway during operation, a combined evaluation model of DEAMATEL-ISM and material element extension was proposed. Firstly, the initial index system was established based on road factors, and the Delphi method and sensitivity analysis were combined to select indicators and establish a comprehensive index system for highway road safety. The DEMATEL-ISM method was used to analyze the importance of each index, and a multi-level hierarchical structure model were constructed to understand the internal influence degree of each index, identify key influencing factors and calculate the initial weight of the index. And then the objective weights obtained by the entropy weight method were combined and optimized for weighting. Finally, the correlation degree was calculated through the material-element extendable model, and the security risk level of each index and the overall was obtained. The results show that the radius of horizontal curve, severe weather such as rain and snow, vehicle speed, traffic saturation, and longitudinal slope are key factors affecting the safety of highways. The proposed model is used to analyze three different sections of a highway in Henan Province, and it is found that section 1 and section 3 have higher safety, while section 2 has average safety. The evaluation calculation results are in line with reality, indicating that the constructed mathematical model is accurate and feasible.

Key words: highway engineering; road safety; extendable model of matter elements; DEMATEL-ISM; entropy weight method