Abstract: The evaluation results of structural health state of urban utility tunnels cannot be quantified and guide operation and maintenance presently. Accordingly, to provide guidance to the operation and maintenance of urban utility tunnels, the application of fuzzy comprehensive evaluation theory in the research of structural health evaluation method of traffic tunnel is analyzed, and the structural health evaluation system of urban utility tunnel is established using this theory according to the analogy method. First, according to the relevant maintenance regulations and investigation results, the evaluation index system of integrity and structure of urban utility tunnel are established based on different needs. Second, based on the maintenance experience of traffic tunnel and utility tunnel, the classification criteria of each index are divided. Third, the weight distribution of evaluation index is calculated using analytic hierarchy process. Fourth, Cauchy distribution membership function and matrix membership function are used to determine the membership degree of each index. Finally, the firstclass and secondclass fuzzy comprehensive evaluation models are established, comment in the evaluation vector are endowed with corresponding scores, and the evaluation vector is uniformed so as to judge the health state of the urban utility tunnel structures. The application results of the proposed evaluation method show that the results obtained are in accord with those obtained by professionals based on experience.

Key words: urban utility tunnel, civil engineering structure, health state assessment, fuzzy comprehensive evaluation