Abstract
To analyze in-service tunnel structure safety, the coupling effect of a multi-factor should be considered. The karst highway tunnel structure safety is classified into five grades based on a railway tunnel health evaluation model. The factors affecting tunnel structure safety are addressed using an analytic hierarchy process. Qualitative indices are classified into five levels according to tunnel safety. A membership function that follows the Gaussian distribution is applied to determine quantitative evaluation indices. Those factors are assigned weights by expert scoring method of system theory, and the treated karst caves are set up as an uncompacted backfill model. A three-grade fuzzy comprehensive evaluation model is finally built for in-service highway tunnel structure safety in the karst area. The safety of Hui-long-shan tunnel is evaluated, and the safety value is judged by the maximum membership law according to the proposed model.
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