Abstract: The geological environment problems which become increasingly prominent in Chongqing tunnel engineering construction process are taken as research objects in this paper. Applying methods of anlaytic hierarchy and scoring by experts,we establish a comprehensive evaluation model by selecting indices and determining the weights of indices. Then, we evaluate the geological environmental negative effect of Yufengshan tunnel of highway-ring around Chongqing; according to the comprehensive evaluation grading standard, we divide the negative effect area into four grades, which are serious area, relatively serious area, medium area and relatively minor area. Through investigation and verification, we found that the evaluation results are basically in accordance with actual situation and the study lays a foundation for the popularization and application of the evaluation method.

Key words: tunnelling engineering, geological environment negative effect, evaluation system, investigation and verification, Yufeng mountain tunnel