Abstract: In order to ensure personnel safety on highway construction sites, a comprehensive evaluation method based on an improved cloud model was worked out for the safety protection systems. A safety evaluation index system was established for safety protection system in highway construction from four aspects including labor protection articles, personnel channel, temporary entrance protection and high work. A fine tuning synthesis operator was proposed to obtain all levels of fuzzy cloud matrix by calculating weighted cloud matrix and safety cloud matrix, which reduced the dependence of entropy on expectation. Finally, the safety cloud image and standard cloud image were generated by normal cloud generator, then the safety states of the whole safety protection system and evaluation indicators at all levels were evaluated. Applying the method to analyze an engineering example. The analysis shows that the safety grade of the whole highway construction safety protection system and that of high work are good, that the safety grade of use and supervision of labor protection supplies is medium. The results show that the evaluation results are basically consistent with the actual situation.

Key words: highway engineering, safety protection, cloud model, fine tuning synthesis operator, safety evaluation